ViewModelbase.cs

Language: C#
Last Modified: 2020-06-27 1:58:37 PM UTC
File Size: 1758 bytes

http://www.penguinstew.ca/example/MVVMbase/ViewModelBase/ViewModelbase.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel;

namespace Penguin.MVVMBase.ViewModelBase

{

public class ViewModelBase : INotifyPropertyChanged

{

#region INotifyPropertyChanged

/// <summary>

/// INotifyPropertyChanged PropertyChanged event thrown when a property is updated

/// </summary>

public event PropertyChangedEventHandler PropertyChanged;

/// <summary>

/// Raises a PropertyChanged event for the given property

/// </summary>

/// <param name="propertyName">The name of the property being updated</param>

protected bool SetProperty<T>(ref T propertyBack, T value, String propertyName)

{

//Don't update if value is the same

if (propertyBack != null && propertyBack.Equals(value))

{

return false;

}

propertyBack = value;

RaisePropertyChanged(propertyName);

return true;

}

protected void RaisePropertyChanged(String propertyName)

{

//Test propertyName to make sure it's a valid property

if (TypeDescriptor.GetProperties(this)[propertyName] == null)

{

string msg = "Invalid property name: " + propertyName;

throw new ArgumentException(msg);

}

//Notify property changed

PropertyChangedEventHandler handler = PropertyChanged;

if (handler != null)

{

handler(this, new PropertyChangedEventArgs(propertyName));

}

#endregion

}