扩展方法定义在静态类(static classes)里,就像静态方法(static methods)一样,但是它们在CLR元数据(CLR metadata)里却被标记为[System.Runtime.CompilerServices.Extension]。程序语言都被鼓励(encourage)为扩展方法提供一种直观的语法(direct syntax)。在 C# 语言里,扩展方
Extension methods are a new feature for C# 3.0 and I had the opportunity to implement them in the Compiler. These methods can then be called with instance syntax on any object that is convertible(see convertibility section for details) to the first param of the method.Validation Extension ...
A a = new A(); B b = new B(); C c = new C(); // For a, b, and c, call the following methods: // -- MethodA with an int argument // -- MethodA with a string argument // -- MethodB with no argument. // A contains no MethodA, so each call to MethodA resolves...
C#之 VS2008 之 Extension Methods~(为变量添加自己的方法) 从ScottGu's Blogs上看到了关于Vs2008中.NET Framework3.5语言(Jeffry Zhao说这是 C#3.0的特性,自己见识太短了)的新特性,其中有一个叫做Extension Methods http://weblogs.asp.net/scottgu/archive/2007/03/13/new-orcas-language-feature-extension-met...
Many types that already exist can't be easily updated without breaking existing code. An example of this is the interface IEnumerable(Of T). In order to support LINQ, new methods had to be added to this interface, but changing the interface by adding new methods would break compatibility wit...
Since Extension methods behave like instance method it makes sense that we should be able to create delegates that would accept the instance method signature, to this end we have included Adding an Extension Methods to delegate invocation List Extension methods can now be used like an instance met...
methods that match the signatures of the following// method calls.b.MethodA(1);// B.MethodA(int)b.MethodB();// B.MethodB()// B has no matching method for the following call, but// class Extension does.b.MethodA("hello");// Extension.MethodA(IMyInterface, string)// C contains...
This gives extension methods the power to change the reference that was used to invoke the value! Obviously this can produce unexpected but often amusing behavior. The following sample prints “False”.code Copy <Extension()> _ Public Sub EnsureNotNull(ByRef str As String) If str Is Nothing...
[2];}_OBJC_$_CATEGORY_CLASS_METHODS_Person_$_Test__attribute__((used,section("__DATA,__objc_const")))={sizeof(_objc_method),2,{{(struct objc_selector*)"run","v16@0:8",(void*)_C_Person_Test_run},{(struct objc_selector*)"walk","v16@0:8",(void*)_C_Person_Test_...
Controversial extension methods: You’ve probably had to do this in C#. You get an object, you need to cast it to some typeTand then fetch a property that is returned as anobject, so you have to castthatto some other typeU, so you can read the destination property....