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C#: ViewModelBase class

ViewModelBase class which implements INotifyPropertyChanged in C#

C# WPF – An Observable String Dictionary class, which can be useful for storing and binding values as (key, value) pairViewModelBase class which implements INotifyPropertyChanged in C# WPF .

An Observable String Dictionary class, which can be useful for storing and binding values as key, value pairs

	public abstract class ViewModelBase : INotifyPropertyChanged
	{
	/// <summary>
	/// Multicast event for property change notifications.
	/// </summary>
	public event PropertyChangedEventHandler PropertyChanged;

	/// <summary>
	/// Checks if a property already matches a desired value. Sets the property and
	/// notifies listeners only when necessary.
	/// </summary>
	/// <typeparam name="T">Type of the property.</typeparam>
	/// <param name="storage">Reference to a property with both getter and setter.</param>
	/// <param name="value">Desired value for the property.</param>
	/// <param name="propertyName">Name of the property used to notify listeners.This
	/// value is optional and can be provided automatically when invoked from compilers that
	/// support CallerMemberName.</param>
	/// <returns>True if the value was changed, false if the existing value matched the
	/// desired value.</returns>
	protected virtual bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
	{
	if (object.Equals(storage, value)) return false;
	storage = value;
	// Log.DebugFormat("{0}.{1} = {2}", this.GetType().Name, propertyName, storage);
	this.OnPropertyChanged(propertyName);
	return true;
	}

	/// <summary>
	/// Notifies listeners that a property value has changed.
	/// </summary>
	/// <param name="propertyName">Name of the property used to notify listeners. This
	/// value is optional and can be provided automatically when invoked from compilers
	/// that support <see cref="CallerMemberNameAttribute"/>.</param>
	protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
	{
	var eventHandler = this.PropertyChanged;
	if (eventHandler != null)
	eventHandler(this, new PropertyChangedEventArgs(propertyName));
	}
	}

view raw ViewModelBase.cs hosted with ❤ by GitHub

On GitHub , All Gits

C#: Observable Dictionary

C# WPF – An Observable String Dictionary class

C# WPF – An Observable String Dictionary class, which can be useful for storing and binding values as (key, value) pair

	// The orginal class was obtained from official site, then I made some desirable changes such as `UpdateOrAdd`,
	// which I think usefull for others
	//
	using System;
	using System.Collections;
	using System.Collections.Generic;
	using System.ComponentModel;

	namespace mynamespace
	{

	class ObservableDictionary : IDictionary<string, string>, INotifyPropertyChanged
	{
	//------------------------------------------------------
	//
	// Constructors
	//
	//------------------------------------------------------

	#region Constructors

	/// <summary>
	/// Creates a ContentLocatorPart with the specified type name and namespace.
	/// </summary>
	public ObservableDictionary()
	{
	_nameValues = new Dictionary<string, string>();
	}

	#endregion Constructors

	//------------------------------------------------------
	//
	// Public Methods
	//
	//------------------------------------------------------

	#region Public Methods

	/// <summary>
	/// Adds a key/value pair to the ContentLocatorPart. If a value for the key already
	/// exists, the old value is overwritten by the new value.
	/// </summary>
	/// <param name="key">key</param>
	/// <param name="val">value</param>
	/// <exception cref="ArgumentNullException">key or val is null</exception>
	/// <exception cref="ArgumentException">a value for key is already present in the locator part</exception>
	public void Add(string key, string val)
	{
	if (key == null \|\| val == null)
	{
	throw new ArgumentNullException(key == null ? "key" : "val");
	}
	_nameValues.Add(key, val);
	FireDictionaryChanged();
	}

	/// <summary>
	/// Removes all name/value pairs from the ContentLocatorPart.
	/// </summary>
	public void Clear()
	{
	int count = _nameValues.Count;

	if (count > 0)
	{
	_nameValues.Clear();

	// Only fire changed event if the dictionary actually changed
	FireDictionaryChanged();
	}
	}

	public void UpdateOrAdd(string key,string value)
	{
	if (ContainsKey(key) == false)
	{
	Add(key, value);
	}
	else
	{
	Remove(key);
	Add(key, value);
	}
	}

	/// <summary>
	/// Returns whether or not a value of the key exists in this ContentLocatorPart.
	/// </summary>
	/// <param name="key">the key to check for</param>
	/// <returns>true - yes, false - no</returns>
	public bool ContainsKey(string key)
	{
	return _nameValues.ContainsKey(key);
	}

	/// <summary>
	/// Removes the key and its value from the ContentLocatorPart.
	/// </summary>
	/// <param name="key">key to be removed</param>
	/// <returns>true - the key was found in the ContentLocatorPart, false o- it wasn't</returns>
	public bool Remove(string key)
	{
	bool exists = _nameValues.Remove(key);

	// Only fire changed event if the key was actually removed
	if (exists)
	{
	FireDictionaryChanged();
	}

	return exists;
	}

	/// <summary>
	/// Returns an enumerator for the key/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <returns>an enumerator for the key/value pairs; never returns null</returns>
	IEnumerator IEnumerable.GetEnumerator()
	{
	return _nameValues.GetEnumerator();
	}

	/// <summary>
	/// Returns an enumerator forthe key/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <returns>an enumerator for the key/value pairs; never returns null</returns>
	public IEnumerator<KeyValuePair<string, string>> GetEnumerator()
	{
	return ((IEnumerable<KeyValuePair<string, string>>)_nameValues).GetEnumerator();
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="key"></param>
	/// <param name="value"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">key is null</exception>
	public bool TryGetValue(string key, out string value)
	{
	if (key == null)
	throw new ArgumentNullException("key");

	return _nameValues.TryGetValue(key, out value);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	void ICollection<KeyValuePair<string, string>>.Add(KeyValuePair<string, string> pair)
	{
	((ICollection<KeyValuePair<string, string>>)_nameValues).Add(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	bool ICollection<KeyValuePair<string, string>>.Contains(KeyValuePair<string, string> pair)
	{
	return ((ICollection<KeyValuePair<string, string>>)_nameValues).Contains(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	bool ICollection<KeyValuePair<string, string>>.Remove(KeyValuePair<string, string> pair)
	{
	return ((ICollection<KeyValuePair<string, string>>)_nameValues).Remove(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="target"></param>
	/// <param name="startIndex"></param>
	/// <exception cref="ArgumentNullException">target is null</exception>
	/// <exception cref="ArgumentOutOfRangeException">startIndex is less than zero or greater than the lenght of target</exception>
	void ICollection<KeyValuePair<string, string>>.CopyTo(KeyValuePair<string, string>[] target, int startIndex)
	{
	if (target == null)
	throw new ArgumentNullException("target");
	if (startIndex < 0 \|\| startIndex > target.Length)
	throw new ArgumentOutOfRangeException("startIndex");

	((ICollection<KeyValuePair<string, string>>)_nameValues).CopyTo(target, startIndex);
	}

	#endregion Public Methods

	//------------------------------------------------------
	//
	// Public Operators
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Public Events
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Public Properties
	//
	//------------------------------------------------------

	#region Public Properties

	/// <summary>
	/// The number of name/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <value>count of name/value pairs</value>
	public int Count
	{
	get
	{
	return _nameValues.Count;
	}
	}

	/// <summary>
	/// Indexer provides lookup of values by key. Gets or sets the value
	/// in the ContentLocatorPart for the specified key. If the key does not exist
	/// in the ContentLocatorPart,
	/// </summary>
	/// <param name="key">key</param>
	/// <returns>the value stored in this locator part for key</returns>
	public string this[string key]
	{
	get
	{
	if (key == null)
	{
	throw new ArgumentNullException("key");
	}

	string value = null;
	_nameValues.TryGetValue(key, out value);
	return value;
	}
	set
	{
	if (key == null)
	{
	throw new ArgumentNullException("key");
	}

	if (value == null)
	{
	throw new ArgumentNullException("value");
	}

	string oldValue = null;
	_nameValues.TryGetValue(key, out oldValue);

	// If the new value is actually different, then we add it and fire
	// a change notification
	if ((oldValue == null) \|\| (oldValue != value))
	{
	_nameValues[key] = value;
	FireDictionaryChanged();
	}
	}
	}

	/// <summary>
	///
	/// </summary>
	public bool IsReadOnly
	{
	get
	{
	return false;
	}
	}

	/// <summary>
	/// Returns a collection of all the keys in this ContentLocatorPart.
	/// </summary>
	/// <value>keys</value>
	public ICollection<string> Keys
	{
	get
	{
	return _nameValues.Keys;
	}
	}

	/// <summary>
	/// Returns a collection of all the values in this ContentLocatorPart.
	/// </summary>
	/// <value>values</value>
	public ICollection<string> Values
	{
	get
	{
	return _nameValues.Values;
	}
	}

	#endregion Public Properties

	//------------------------------------------------------
	//
	// Public Events
	//
	//------------------------------------------------------

	//------------------------------------------------------
	//
	// Internal Methods
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Internal Operators
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Internal Events
	//
	//------------------------------------------------------

	#region Public Events

	/// <summary>
	///
	/// </summary>
	public event PropertyChangedEventHandler PropertyChanged;

	#endregion Public Events

	//------------------------------------------------------
	//
	// Internal Properties
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Private Methods
	//
	//------------------------------------------------------

	#region Private Methods

	/// <summary>
	/// Notify the owner this ContentLocatorPart has changed.
	/// </summary>
	private void FireDictionaryChanged()
	{
	if (PropertyChanged != null)
	{
	PropertyChanged(this, new PropertyChangedEventArgs(null));
	}
	}

	#endregion Private Methods

	//------------------------------------------------------
	//
	// Private Fields
	//
	//------------------------------------------------------

	#region Private Fields

	/// <summary>
	/// The internal data structure.
	/// </summary>
	private Dictionary<string, string> _nameValues;

	#endregion Private Fields
	}
	}

view raw observableStringDictionary.cs hosted with ❤ by GitHub

Create Checked List Box in WPF C#

Checked List box is the combination of Text and Check box. In the C# tool box you have Listbox and Combo box , not the checked listbox.

The Data template become the savior for you. We can create a Data Template for our List box.

In fact Data template can be used to customize the look and feel of the listbox items, what ever you wish.

Let’s add a Simple ListBox with Check box using XAML code which bind the Product List

<ListBox Style="{DynamicResource prent_and_groups_List}"   Background="LightGreen" SelectedItem="SlectedAccount" ItemsSource="{Binding Products}"   Grid.Row="1" Grid.Column="1"  Grid.RowSpan="2" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <CheckBox IsChecked="{Binding Ischecked}" Content="{Binding Name}" />
                </DataTemplate>
            </ListBox.ItemTemplate>
            
        </ListBox>

C# WPF – Custom Observable String Dictionary for Binding

Use custom Observable Dictionary for Binding in WPF C#.Net

Observable collection objects come handy when you dealing with Binding controls with values in WPF and C#.Net.

Dictionary object help you to build a collection values using a single dictionary with key, value pair.

With both we can build a custom class for binding and dynamically updated collection, which can be used for multiple purposes, around your projects.

The root : Observable Dictionary

	// The orginal class was obtained from official site, then I made some desirable changes such as `UpdateOrAdd`,
	// which I think usefull for others
	//
	using System;
	using System.Collections;
	using System.Collections.Generic;
	using System.ComponentModel;

	namespace mynamespace
	{

	class ObservableDictionary : IDictionary<string, string>, INotifyPropertyChanged
	{
	//------------------------------------------------------
	//
	// Constructors
	//
	//------------------------------------------------------

	#region Constructors

	/// <summary>
	/// Creates a ContentLocatorPart with the specified type name and namespace.
	/// </summary>
	public ObservableDictionary()
	{
	_nameValues = new Dictionary<string, string>();
	}

	#endregion Constructors

	//------------------------------------------------------
	//
	// Public Methods
	//
	//------------------------------------------------------

	#region Public Methods

	/// <summary>
	/// Adds a key/value pair to the ContentLocatorPart. If a value for the key already
	/// exists, the old value is overwritten by the new value.
	/// </summary>
	/// <param name="key">key</param>
	/// <param name="val">value</param>
	/// <exception cref="ArgumentNullException">key or val is null</exception>
	/// <exception cref="ArgumentException">a value for key is already present in the locator part</exception>
	public void Add(string key, string val)
	{
	if (key == null \|\| val == null)
	{
	throw new ArgumentNullException(key == null ? "key" : "val");
	}
	_nameValues.Add(key, val);
	FireDictionaryChanged();
	}

	/// <summary>
	/// Removes all name/value pairs from the ContentLocatorPart.
	/// </summary>
	public void Clear()
	{
	int count = _nameValues.Count;

	if (count > 0)
	{
	_nameValues.Clear();

	// Only fire changed event if the dictionary actually changed
	FireDictionaryChanged();
	}
	}

	public void UpdateOrAdd(string key,string value)
	{
	if (ContainsKey(key) == false)
	{
	Add(key, value);
	}
	else
	{
	Remove(key);
	Add(key, value);
	}
	}

	/// <summary>
	/// Returns whether or not a value of the key exists in this ContentLocatorPart.
	/// </summary>
	/// <param name="key">the key to check for</param>
	/// <returns>true - yes, false - no</returns>
	public bool ContainsKey(string key)
	{
	return _nameValues.ContainsKey(key);
	}

	/// <summary>
	/// Removes the key and its value from the ContentLocatorPart.
	/// </summary>
	/// <param name="key">key to be removed</param>
	/// <returns>true - the key was found in the ContentLocatorPart, false o- it wasn't</returns>
	public bool Remove(string key)
	{
	bool exists = _nameValues.Remove(key);

	// Only fire changed event if the key was actually removed
	if (exists)
	{
	FireDictionaryChanged();
	}

	return exists;
	}

	/// <summary>
	/// Returns an enumerator for the key/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <returns>an enumerator for the key/value pairs; never returns null</returns>
	IEnumerator IEnumerable.GetEnumerator()
	{
	return _nameValues.GetEnumerator();
	}

	/// <summary>
	/// Returns an enumerator forthe key/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <returns>an enumerator for the key/value pairs; never returns null</returns>
	public IEnumerator<KeyValuePair<string, string>> GetEnumerator()
	{
	return ((IEnumerable<KeyValuePair<string, string>>)_nameValues).GetEnumerator();
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="key"></param>
	/// <param name="value"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">key is null</exception>
	public bool TryGetValue(string key, out string value)
	{
	if (key == null)
	throw new ArgumentNullException("key");

	return _nameValues.TryGetValue(key, out value);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	void ICollection<KeyValuePair<string, string>>.Add(KeyValuePair<string, string> pair)
	{
	((ICollection<KeyValuePair<string, string>>)_nameValues).Add(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	bool ICollection<KeyValuePair<string, string>>.Contains(KeyValuePair<string, string> pair)
	{
	return ((ICollection<KeyValuePair<string, string>>)_nameValues).Contains(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="pair"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentNullException">pair is null</exception>
	bool ICollection<KeyValuePair<string, string>>.Remove(KeyValuePair<string, string> pair)
	{
	return ((ICollection<KeyValuePair<string, string>>)_nameValues).Remove(pair);
	}

	/// <summary>
	///
	/// </summary>
	/// <param name="target"></param>
	/// <param name="startIndex"></param>
	/// <exception cref="ArgumentNullException">target is null</exception>
	/// <exception cref="ArgumentOutOfRangeException">startIndex is less than zero or greater than the lenght of target</exception>
	void ICollection<KeyValuePair<string, string>>.CopyTo(KeyValuePair<string, string>[] target, int startIndex)
	{
	if (target == null)
	throw new ArgumentNullException("target");
	if (startIndex < 0 \|\| startIndex > target.Length)
	throw new ArgumentOutOfRangeException("startIndex");

	((ICollection<KeyValuePair<string, string>>)_nameValues).CopyTo(target, startIndex);
	}

	#endregion Public Methods

	//------------------------------------------------------
	//
	// Public Operators
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Public Events
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Public Properties
	//
	//------------------------------------------------------

	#region Public Properties

	/// <summary>
	/// The number of name/value pairs in this ContentLocatorPart.
	/// </summary>
	/// <value>count of name/value pairs</value>
	public int Count
	{
	get
	{
	return _nameValues.Count;
	}
	}

	/// <summary>
	/// Indexer provides lookup of values by key. Gets or sets the value
	/// in the ContentLocatorPart for the specified key. If the key does not exist
	/// in the ContentLocatorPart,
	/// </summary>
	/// <param name="key">key</param>
	/// <returns>the value stored in this locator part for key</returns>
	public string this[string key]
	{
	get
	{
	if (key == null)
	{
	throw new ArgumentNullException("key");
	}

	string value = null;
	_nameValues.TryGetValue(key, out value);
	return value;
	}
	set
	{
	if (key == null)
	{
	throw new ArgumentNullException("key");
	}

	if (value == null)
	{
	throw new ArgumentNullException("value");
	}

	string oldValue = null;
	_nameValues.TryGetValue(key, out oldValue);

	// If the new value is actually different, then we add it and fire
	// a change notification
	if ((oldValue == null) \|\| (oldValue != value))
	{
	_nameValues[key] = value;
	FireDictionaryChanged();
	}
	}
	}

	/// <summary>
	///
	/// </summary>
	public bool IsReadOnly
	{
	get
	{
	return false;
	}
	}

	/// <summary>
	/// Returns a collection of all the keys in this ContentLocatorPart.
	/// </summary>
	/// <value>keys</value>
	public ICollection<string> Keys
	{
	get
	{
	return _nameValues.Keys;
	}
	}

	/// <summary>
	/// Returns a collection of all the values in this ContentLocatorPart.
	/// </summary>
	/// <value>values</value>
	public ICollection<string> Values
	{
	get
	{
	return _nameValues.Values;
	}
	}

	#endregion Public Properties

	//------------------------------------------------------
	//
	// Public Events
	//
	//------------------------------------------------------

	//------------------------------------------------------
	//
	// Internal Methods
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Internal Operators
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Internal Events
	//
	//------------------------------------------------------

	#region Public Events

	/// <summary>
	///
	/// </summary>
	public event PropertyChangedEventHandler PropertyChanged;

	#endregion Public Events

	//------------------------------------------------------
	//
	// Internal Properties
	//
	//------------------------------------------------------
	//------------------------------------------------------
	//
	// Private Methods
	//
	//------------------------------------------------------

	#region Private Methods

	/// <summary>
	/// Notify the owner this ContentLocatorPart has changed.
	/// </summary>
	private void FireDictionaryChanged()
	{
	if (PropertyChanged != null)
	{
	PropertyChanged(this, new PropertyChangedEventArgs(null));
	}
	}

	#endregion Private Methods

	//------------------------------------------------------
	//
	// Private Fields
	//
	//------------------------------------------------------

	#region Private Fields

	/// <summary>
	/// The internal data structure.
	/// </summary>
	private Dictionary<string, string> _nameValues;

	#endregion Private Fields
	}
	}

view raw observableStringDictionary.cs hosted with ❤ by GitHub

Our class utilizes two interphases namely Dictionary and INotifyPropertyChanged. The INotifyPropertyChanged and the implemented methods help use to update the data source where the object is binded. As a result when ever the object updated with new values, the control automatically updates.

How to use

Drop the class file to your solution and create an object of our class and also add some values to the dictionary as follows

ObservableDictionary _items = new ObservableDictionary();
_items.UpdateOrAdd("Dev", "Manoj");
_items.UpdateOrAdd("Lan", "C#");
tbl_lan.DataCOntext=_items;
tbl_lan.DataCOntext=_items;

xaml

 <TextBlock x:Name="tbl_dev" TextAlignment="Left" HorizontalAlignment="Left" Text="{Binding [Dev]}" Foreground="LightGoldenrodYellow" />
 <TextBlock x:Name="tbl_lan" TextAlignment="Left" HorizontalAlignment="Left" Text="{Binding [Lan]}" Foreground="LightGoldenrodYellow" />

Go head and customize the class to meet your requirements

Storyboard animation in WPF C#

How to add cool font animation using Event Trigger and Storyboard in WPF C#

WPF allows you to customize the look and feel using XAML and Styles, it allow capable of create some cool animation which is a way of interacting with user and UI. You can use Storyboard with EvenTrigger.

Let’s create a style for a textbox control, which add some color, align text etc ,then add a Style trigger and Event trigger which also add some font animation , want to play while the textbox has focus and lost it’s focus.

The Style

It is a simple style, add font, alignment etc Name the style as NuberTex.

 <Style x:Key="NumberText" TargetType="TextBox">
        <Setter Property="FontSize" Value="18"/>
        <Setter Property="TextAlignment" Value="Right"/>   
        

  </Style>

To use this style add the following lines to the TextBox control (xaml).

 <TextBox  Style="{DynamicResource NumberText}" />

Storyboard

Now we can add a Event trigger and a story board to the above style. First we create a style trigger and then we want to add some style based on Events, namely Gotfocus and Lostfocus.

<Style.Triggers >
            <Trigger Property="IsFocused" Value="True">
                <Setter Property="Foreground" Value="IndianRed"/>
            </Trigger>
            <EventTrigger RoutedEvent="GotFocus">
                <EventTrigger.Actions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Duration="0:0:0:1" To="20" Storyboard.TargetProperty="FontSize" From="18"  />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>
            
            <EventTrigger RoutedEvent="LostFocus">
                <EventTrigger.Actions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Duration="0:0:0:1" From="20" Storyboard.TargetProperty="FontSize" To="18"  />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>
            
        </Style.Triggers>

The storyboard is added within the trigger action. We used a double animation which increase the font from range of values specified using To and From, you can specify what event property you want to play using Target property.

Complete Style

Here is the full style

<Style x:Key="NumberText" TargetType="TextBox">
        <Setter Property="FontSize" Value="18"/>
        <Setter Property="TextAlignment" Value="Right"/>         
        
        <Style.Triggers >
            <Trigger Property="IsFocused" Value="True">
                <Setter Property="Foreground" Value="IndianRed"/>
            </Trigger>
            <EventTrigger RoutedEvent="GotFocus">
                <EventTrigger.Actions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Duration="0:0:0:1" To="20" Storyboard.TargetProperty="FontSize" From="18"  />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>
            
            <EventTrigger RoutedEvent="LostFocus">
                <EventTrigger.Actions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation Duration="0:0:0:1" From="20" Storyboard.TargetProperty="FontSize" To="18"  />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>
            
        </Style.Triggers>

    </Style>

Add a alternate color to ListView rows in WPF using XAML

How to add a alternate row style for Listview using Style and Style Triggers in WPF/C#

Using Alteration count you can add Datagrid like alternate background for ListViewItems. There is no alternate background property for ListView control in WPF, instead we can made this possible with style triggers.

Style triggers work with property and we can track the change with trigger value value.

Styles

The alternate color we want to apply is for ListViewItems , so we have to create a Itemcontainer style for ListView as follows.

    <Style TargetType="ListViewItem" x:Key="gridview_itemcontainer1" >
        <Setter Property="Foreground" Value="DarkBlue"/>
        <Setter Property="FontSize" Value="13.5"/>       
    </Style>

You can define the style as resource file or can define as ListView.Resources in your xaml portion of UI.

As ListViewResource

<ListView AlternationCount=2 >
  <ListView.Resources>
   <Style TargetType="ListViewItem" >
        <Setter Property="Foreground" Value="DarkBlue"/>
        <Setter Property="FontSize" Value="13.5"/>       
    </Style>
  </ListView.Resources>

<ListView/>

In our style we are define background and font using Setter. Likewise we can add some Style Triggers. We want to change the color of ListViewItems according to the AlternationIndex value.

Style.Triggers

Add the following style trigger section in our style.

<Style.Triggers>
    <Trigger Property="ItemsControl.AlternationIndex" Value="0">
       <Setter Property="Background" Value="LightBlue"></Setter>
    </Trigger>
    <Trigger Property="ItemsControl.AlternationIndex" Value="1">
       <Setter Property="Background" Value="LightYellow"></Setter>
    </Trigger>
 </Style.Triggers>

We had added two trigger for checking the alternationIndex value and a associated setter for setting background property of ListViewItem.

Our style is finished and purpose is served.

If you are use resource file you can assign the style to Item container as ItemContainerStyle=”{DynamicResource <RESOURCEKEY>}”. Replace the RESOURCE KEY with your own style key.

How to use common folder paths in C#

How to use file paths in c# while designing and developing applications.

Reading files from application path may be one of key requirement of any application. Actually we can place many place you love to have, on a installation machine there can be restriction as well.

Like wise in a Windows system, installer may want to put apps and other files to Programfiles. This folder intended to work with executable,configuration files etc. You can’t programmatically create new folder or files in Programfiles folder, which may require some admin rights. So where we kept those documents and other data ?

It is wise to store such files on Application data folder or even on your Document folder. For reports and other stuffs Document folder is enough.

Access Special Folders

We can use the Enironment.SpecialFolder to access the App data and Documents and also can fetch path to those folders using GetFolderPath method of Environment class.

datapath = Environment.GetFolderPath(Environment.SpecialFolder
.ApplicationData);
reportPath = Environment.GetFolderPath(Environment.
SpecialFolder.MyDocuments);

the first line will get the location of C:\Users\manoj\AppData\Roaming and the second will show the Document folder path .

Access application path

How to access application/executable path in C#. This can be done using Application.ExecutablePath and the GetFolderPath method

 Path.GetDirectoryName(Application.ExecutablePath);

Convert Doc file to PDF,XPS,SVG,XML,HTML using Spire in C#

How to convert Document file to Convert Word to PDF,HTML,Image,XML and XPS in C#.Net without Word Automation

There are many useful libraries around Nuget which can be made your application more productive. We already learned how to create PDF files from a Word Document using Interop and Docx.

Free Spire.Doc offer high performance operation on word documents. You can check the project on Codeplex Achive

Spire offer following feature

*Convert Word to PDF
*Convert Word to HTML
*Convert Word to Image
*Convert Word to XML
*Convert Word to RTF
*Convert Word to EMF
*Convert Word to XPS

How to Convert Doc to PDF

Add the library to your project using Nuget Package Manager

Visual Studio 2019 : Nuget Package Manager

Pages: 12

Create aggregate function using lambda expressions on collectionView in C#

How to create aggregate function using lambda expressions on collectionView in C#

Hope you need this article for updating your skills. As we seen in the last article, we learned about collection view and how to create filters using them. If you miss just take a look at it. To I will help you learn som lambda expression

Lambda experession ?

Lambda expressions permit the creation of anonymous functions with a very concise syntax. I don’t want explain what lambda expression is , I will show you how to use it. For learn more about lambda please visit Richard Carr’s lackwaspBlog ,he had a detailed guide to lambda.

The following is an example of lambda expression.

(params) => expression

let’s jump into the regular salesinformation example. The sales Collection used to store all sales information such as Customer,Date,Amount,tax,discount etc. It may contain many of them, that is why we used collection or List.

We are going to use Agrgregate feature of collectionview object to create lambda function, for find total sale amount ,tax collected etc

 var total_saleAmount = Salescolletionview.Cast<SalesView>()
.Aggregate<SalesView, double>(0, (totalSale, s) => totalSales += s.Amount);

The SaleCollectionView class Hold information about Sales which is in the type of ViewClass. So first up all we can cast the view to SalesView and then invoke Aggregate. The Aggregate functionality of C#.Net let us create anonymous function using lambda expression.

At first we had initialise the output variable and access the Amount property of viewclass and then add it up.

In the similar manner you can operate on other properties of view class.

 var total_tax = Salescolletionview.Cast<SalesView>().
Aggregate<SalesView, double>(0, (tax, s) => tax+= s.Tax);

C#Tips/Tricks – XAML Formating

Do you know , within XAML element of you C# WPF application , the binded data can be formated using sting format. For a date field you can use the following style

Do you know , within XAML element of you C# WPF application , the binded data can be formated using string format. For a date field you can use the following style

<TextBlock x:Name="tbl_fy" Text="{Binding [0].f_date1,
 StringFormat={}{0:MMM/dd/yyyy}}" Foreground="Beige"
 FontSize="14" Width="119"/>

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The root : Observable Dictionary

How to use

xaml

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The Style

Storyboard

Complete Style

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Styles

As ListViewResource

Style.Triggers

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Access Special Folders

Access application path

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How to Convert Doc to PDF

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Lambda experession ?

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