127 lines
3.9 KiB
C#
127 lines
3.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.ComponentModel;
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using System.Diagnostics;
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namespace WPFCatalog
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{
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public abstract class ViewModelBase : GalaSoft.MvvmLight.ViewModelBase, INotifyPropertyChanged, IDisposable
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{
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#region Constructor
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protected ViewModelBase()
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{
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}
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#endregion // Constructor
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#region DisplayName
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/// <summary>
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/// Returns the user-friendly name of this object.
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/// Child classes can set this property to a new value,
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/// or override it to determine the value on-demand.
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/// </summary>
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public virtual string DisplayName { get; protected set; }
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#endregion // DisplayName
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#region Debugging Aides
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///// <summary>
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///// Warns the developer if this object does not have
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///// a public property with the specified name. This
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///// method does not exist in a Release build.
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///// </summary>
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//[Conditional("DEBUG")]
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//[DebuggerStepThrough]
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//public void VerifyPropertyName(string propertyName)
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//{
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// // Verify that the property name matches a real,
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// // public, instance property on this object.
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// if (TypeDescriptor.GetProperties(this)[propertyName] == null)
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// {
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// string msg = "Invalid property name: " + propertyName;
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// if (this.ThrowOnInvalidPropertyName)
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// throw new Exception(msg);
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// else
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// Debug.Fail(msg);
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// }
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//}
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/// <summary>
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/// Returns whether an exception is thrown, or if a Debug.Fail() is used
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/// when an invalid property name is passed to the VerifyPropertyName method.
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/// The default value is false, but subclasses used by unit tests might
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/// override this property's getter to return true.
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/// </summary>
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protected virtual bool ThrowOnInvalidPropertyName { get; private set; }
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#endregion // Debugging Aides
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#region INotifyPropertyChanged Members
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/// <summary>
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/// Raised when a property on this object has a new value.
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/// </summary>
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//public event PropertyChangedEventHandler PropertyChanged;
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///// <summary>
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///// Raises this object's PropertyChanged event.
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///// </summary>
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///// <param name="propertyName">The property that has a new value.</param>
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//protected virtual void OnPropertyChanged(string propertyName)
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//{
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// this.VerifyPropertyName(propertyName);
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// PropertyChangedEventHandler handler = this.PropertyChanged;
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// if (handler != null)
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// {
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// var e = new PropertyChangedEventArgs(propertyName);
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// handler(this, e);
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// }
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//}
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#endregion // INotifyPropertyChanged Members
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#region IDisposable Members
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/// <summary>
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/// Invoked when this object is being removed from the application
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/// and will be subject to garbage collection.
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/// </summary>
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public void Dispose()
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{
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this.OnDispose();
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}
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/// <summary>
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/// Child classes can override this method to perform
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/// clean-up logic, such as removing event handlers.
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/// </summary>
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protected virtual void OnDispose()
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{
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}
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#if DEBUG
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/// <summary>
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/// Useful for ensuring that ViewModel objects are properly garbage collected.
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/// </summary>
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~ViewModelBase()
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{
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string msg = string.Format("{0} ({1}) ({2}) Finalized", this.GetType().Name, this.DisplayName, this.GetHashCode());
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System.Diagnostics.Debug.WriteLine(msg);
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}
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#endif
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#endregion // IDisposable Members
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}
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}
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