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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / TemplateKey.cs / 1 / TemplateKey.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Base class for DataTemplateKey, TableTemplateKey. // //--------------------------------------------------------------------------- using System; using System.Reflection; using System.ComponentModel; using System.Windows.Markup; using MS.Internal.Data; // DataBindEngine.EnglishUSCulture namespace System.Windows { ///The TemplateKey object is used as the resource key for data templates [TypeConverter(typeof(TemplateKeyConverter))] public abstract class TemplateKey : ResourceKey, ISupportInitialize { ///Constructor (called by derived classes only) protected TemplateKey(TemplateType templateType) { _dataType = null; // still needs to be initialized _templateType = templateType; } ///Constructor (called by derived classes only) protected TemplateKey(TemplateType templateType, object dataType) { Exception ex = ValidateDataType(dataType, "dataType"); if (ex != null) throw ex; _dataType = dataType; _templateType = templateType; } #region ISupportInitialize ///Begin Initialization void ISupportInitialize.BeginInit() { _initializing = true; } ///End Initialization, verify that internal state is consistent void ISupportInitialize.EndInit() { if (_dataType == null) { throw new InvalidOperationException(SR.Get(SRID.PropertyMustHaveValue, "DataType", this.GetType().Name)); } _initializing = false; } #endregion ISupportInitialize ////// The type for which the template is designed. This is either /// a Type (for object data), or a string (for XML data). In the latter /// case the string denotes the XML tag name. /// public object DataType { get { return _dataType; } set { if (!_initializing) throw new InvalidOperationException(SR.Get(SRID.PropertyIsInitializeOnly, "DataType", this.GetType().Name)); if (_dataType != null && value != _dataType) throw new InvalidOperationException(SR.Get(SRID.PropertyIsImmutable, "DataType", this.GetType().Name)); Exception ex = ValidateDataType(value, "value"); if (ex != null) throw ex; _dataType = value; } } ///Override of Object.GetHashCode() public override int GetHashCode() { // note that the hash code can change, but only during intialization // and only once (DataType can only be changed once, from null to // non-null, and that can only happen during [Begin/End]Init). // Technically this is still a violation of the "constant during // lifetime" rule, however in practice this is acceptable. It is // very unlikely that someone will put a TemplateKey into a hashtable // before it is initialized. int hashcode = (int)_templateType; if (_dataType != null) { hashcode += _dataType.GetHashCode(); } return hashcode; } ///Override of Object.Equals() public override bool Equals(object o) { TemplateKey key = o as TemplateKey; if (key != null) { return _templateType == key._templateType && Object.Equals(_dataType, key._dataType); } return false; } ///Override of Object.ToString() public override string ToString() { Type type = DataType as Type; return (DataType != null) ? String.Format(DataBindEngine.EnglishUSCulture, "{0}({1})", this.GetType().Name, DataType) : String.Format(DataBindEngine.EnglishUSCulture, "{0}(null)", this.GetType().Name); } ////// Allows SystemResources to know which assembly the template might be defined in. /// public override Assembly Assembly { get { Type type = _dataType as Type; if (type != null) { return type.Assembly; } return null; } } ///The different types of templates that use TemplateKey protected enum TemplateType { ///DataTemplate DataTemplate, ///TableTemplate TableTemplate, } // Validate against these rules // 1. dataType must not be null (except at initialization, which is tested at EndInit) // 2. dataType must be either a Type (object data) or a string (XML tag name) // 3. dataType cannot be typeof(Object) internal static Exception ValidateDataType(object dataType, string argName) { Exception result = null; if (dataType == null) { result = new ArgumentNullException(argName); } else if (!(dataType is Type) && !(dataType is String)) { result = new ArgumentException(SR.Get(SRID.MustBeTypeOrString, dataType.GetType().Name), argName); } else if (dataType == typeof(Object)) { result = new ArgumentException(SR.Get(SRID.DataTypeCannotBeObject), argName); } return result; } object _dataType; TemplateType _templateType; bool _initializing; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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