老外编的程序（五）－－如何使用全球标识符（GUID）
点击次数：26 次 发布日期：2008-11-27 01:15:40 作者：源代码网
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// Running the regasm will generate .reg and .tlb files. Reg file can be // used to register the interface and coclass with the registry. Tlb file // are used to do interop. Also illustrates how System.Guid can be constructed // and how guid objects can be compared. namespace GuidSnippet { //<Snippet1> using System; using System.Runtime.InteropServices; // Guid for the interface IFoo. [Guid("F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4")] interface IFoo { void Foo(); } // Guid for the coclass CFoo. [Guid("936DA01F-9ABD-4d9d-80C7-02AF85C822A8")] public class CFoo : IFoo { // Run regasm on this assembly to create .reg and .tlb files. // Reg file can be used to register this coclass in the registry. // Tlb file will be used to do interop. public void Foo() {} public static void Main( string []args ) { // Snippet addresses the following in System.Runtime.InterOpServices.GuidAttribute. // How to specify the attribute on interface/coclass. // Retrieve the GuidAttribute from an interface/coclass. // Value property on GuidAttribute class. // Snippet addresses the following in System.Guid. // Constructor Guid(string). // Constructor Guid(ByteArray). // Equals. // Operator ==. // CompareTo. Attribute IFooAttribute = Attribute.GetCustomAttribute( typeof( IFoo ), typeof( GuidAttribute ) ); // The Value property of GuidAttribute returns a string. System.Console.WriteLine( "IFoo Attribute: " + ((GuidAttribute)IFooAttribute).Value ); // Using the string to create a guid. Guid guidFoo1 = new Guid( ((GuidAttribute)IFooAttribute).Value ); // Using a byte array to create a guid. Guid guidFoo2 = new Guid ( guidFoo1.ToByteArray() ); // Equals is overriden and so value comparison is done though references are different. if ( guidFoo1.Equals( guidFoo2 ) ) System.Console.WriteLine( "guidFoo1 equals guidFoo2" ); else System.Console.WriteLine( "guidFoo1 not equals guidFoo2" ); // Equality operator can also be used to determine if two guids have same value. if ( guidFoo1 == guidFoo2 ) System.Console.WriteLine( "guidFoo1 == guidFoo2" ); else System.Console.WriteLine( "guidFoo1 != guidFoo2" ); // CompareTo returns 0 if the guids have same value. if ( guidFoo1.CompareTo( guidFoo2 ) == 0 ) System.Console.WriteLine( "guidFoo1 compares to guidFoo2" ); else System.Console.WriteLine( "guidFoo1 does not compare to guidFoo2" ); System.Console.ReadLine(); //Output. //IFoo Attribute: F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4 //guidFoo1 equals guidFoo2 //guidFoo1 == guidFoo2 //guidFoo1 compares to guidFoo2 } &nb  源代码网供稿. |
