Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Data / ValueConversionAttribute.cs / 1305600 / ValueConversionAttribute.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: allows the author of a IValueConverter // to specify what source and target property types the // ValueConverter is capable of converting // // Specs: http://avalon/connecteddata/Specs/Data%20Binding.mht // //--------------------------------------------------------------------------- using System; namespace System.Windows.Data { ////// This attribute allows the author of a ////// to specify what source and target property types the ValueConverter is capable of converting. /// This meta data is useful for designer tools to help categorize and match ValueConverters. /// /// Add this custom attribute to your IValueConverter class definition. /// [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)] public sealed class ValueConversionAttribute : Attribute { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- ////// [ValueConversion(typeof(Employee), typeof(Brush))] /// class MyConverter : IValueConverter /// { /// public object Convert(object value, Type targetType, object parameter, CultureInfo culture) /// { /// if (value is Dev) return Brushes.Beige; /// if (value is Employee) return Brushes.Salmon; /// return Brushes.Yellow; /// } /// } ///
////// Creates a new ValueConversionAttribute to indicate between /// what types of a data binding source and target this ValueConverter can convert. /// /// the expected source type this ValueConverter can handle /// the target type to which this ValueConverter can convert to public ValueConversionAttribute(Type sourceType, Type targetType) { if (sourceType == null) throw new ArgumentNullException("sourceType"); if (targetType == null) throw new ArgumentNullException("targetType"); _sourceType = sourceType; _targetType = targetType; } ////// The expected source type this ValueConverter can handle. /// public Type SourceType { get { return _sourceType; } } ////// The target type to which this ValueConverter can convert to. /// public Type TargetType { get { return _targetType; } } ////// The type of the optional ValueConverter Parameter object. /// public Type ParameterType { get { return _parameterType; } set { _parameterType = value; } } ////// Returns the unique identifier for this Attribute. /// // Type ID is used to remove redundant attributes by // putting all attributes in a dictionary of [TypeId, Attribute]. // If you want AllowMultiple attributes to work with designers, // you must override TypeId. The default implementation returns // this.GetType(), which is appropriate for AllowMultiple = false, but // not for AllowMultiple = true; public override object TypeId { // the attribute itself will be used as a key to the dictionary get { return this; } } ////// Returns the hash code for this instance. /// override public int GetHashCode() { // the default implementation does some funky enumeration over its fields // we can do better and use the 2 mandatory fields source/targetType's hash codes return _sourceType.GetHashCode() + _targetType.GetHashCode(); } //-------------------------------------------- // Private members //-------------------------------------------- private Type _sourceType; private Type _targetType; private Type _parameterType; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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