Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Ink / ExtendedProperty.cs / 1305600 / ExtendedProperty.cs
//------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------- using MS.Utility; using System; using System.IO; using System.Collections; using System.Runtime.InteropServices; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; using System.Text; using MS.Internal.Ink.InkSerializedFormat; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Ink { ////// Drawing Attribute Key/Value pair for specifying each attribute /// internal sealed class ExtendedProperty { ////// Create a new drawing attribute with the specified key and value /// /// Identifier of attribute /// Attribute value - not that the Type for value is tied to the id ///Value type must be compatible with attribute Id internal ExtendedProperty(Guid id, object value) { if (id == Guid.Empty) { throw new ArgumentException(SR.Get(SRID.InvalidGuid)); } _id = id; Value = value; } ///Returns a value that can be used to store and lookup /// ExtendedProperty objects in a hash table public override int GetHashCode() { return Id.GetHashCode() ^ Value.GetHashCode(); } ///Determine if two ExtendedProperty objects are equal public override bool Equals(object obj) { if (obj == null || obj.GetType() != GetType()) { return false; } ExtendedProperty that = (ExtendedProperty)obj; if (that.Id == this.Id) { Type type1 = this.Value.GetType(); Type type2 = that.Value.GetType(); if (type1.IsArray && type2.IsArray) { Type elementType1 = type1.GetElementType(); Type elementType2 = type2.GetElementType(); if (elementType1 == elementType2 && elementType1.IsValueType && type1.GetArrayRank() == 1 && elementType2.IsValueType && type2.GetArrayRank() == 1) { Array array1 = (Array)this.Value; Array array2 = (Array)that.Value; if (array1.Length == array2.Length) { for (int i = 0; i < array1.Length; i++) { if (!array1.GetValue(i).Equals(array2.GetValue(i))) { return false; } } return true; } } } else { return that.Value.Equals(this.Value); } } return false; } ///Overload of the equality operator for comparing /// two ExtendedProperty objects public static bool operator ==(ExtendedProperty first, ExtendedProperty second) { if ((object)first == null && (object)second == null) { return true; } else if ((object)first == null || (object)second == null) { return false; } else { return first.Equals(second); } } ///Compare two custom attributes for Id and value inequality ///Value comparison is performed based on Value.Equals public static bool operator !=(ExtendedProperty first, ExtendedProperty second) { return !(first == second); } ////// Returns a debugger-friendly version of the ExtendedProperty /// ///public override string ToString() { string val; if (Value == null) { val = " "; } else if (Value is string) { val = "\"" + Value.ToString() + "\""; } else { val = Value.ToString(); } return KnownIds.ConvertToString(Id) + "," + val; } /// /// Retrieve the Identifier, or key, for Drawing Attribute key/value pair /// internal Guid Id { get { return _id; } } ////// Set or retrieve the value for ExtendedProperty key/value pair /// ///Value type must be compatible with attribute Id ///Value can be null. internal object Value { get { return _value; } set { if (value == null) { throw new ArgumentNullException("value"); } // validate the type information for the id against the id ExtendedPropertySerializer.Validate(_id, value); _value = value; } } ////// Creates a copy of the Guid and Value /// ///internal ExtendedProperty Clone() { // // the only properties we accept are value types or arrays of // value types with the exception of string. // Guid guid = _id; //Guid is a ValueType that copies on assignment Type type = _value.GetType(); // // check for the very common, copy on assignment // types (ValueType or string) // if (type.IsValueType || type == typeof(string)) { // // either ValueType or string is passed by value // return new ExtendedProperty(guid, _value); } else if (type.IsArray) { Type elementType = type.GetElementType(); if (elementType.IsValueType && type.GetArrayRank() == 1) { // // copy the array memebers, which we know are copy // on assignment value types // Array newArray = Array.CreateInstance(elementType, ((Array)_value).Length); Array.Copy((Array)_value, newArray, ((Array)_value).Length); return new ExtendedProperty(guid, newArray); } } // // we didn't find a type we expect, throw // throw new InvalidOperationException(SR.Get(SRID.InvalidDataTypeForExtendedProperty)); } private Guid _id; // id of attribute private object _value; // data in attribute } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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