1.为什么有时候你再执行某个方法的时候比如某个操作 a.权限验证 b.任务执行 当我执行到这个方法的时候，我可以先验证权限，如果验证不通过则替换到另一个方法去执行 public class MyValueCalculator { public virtual string ComputeValue(string input) { // ... some real code } // 2.代码实现 替换类(含替换方法)的定义 /// <summary> /// Meant to be used to override the existing ComputeValue(string) /// implementation in MyValueCalculator. /// </summary> public class ReplacementComputeValue : IMethodReplacer { public object Implement(object target, MethodInfo method, object[] arguments) { // get the input value, work with it, and return a computed result... string value = (string) arguments[0]; // compute... return result; } } 3. <object id="myValueCalculator" type="Examples.MyValueCalculator, ExampleAssembly"> <!-- arbitrary method replacement --> <replaced-method name="ComputeValue" replacer="replacementComputeValue"> <arg-type match="String"/> </replaced-method> </object> <object id="replacementComputeValue" type="Examples.ReplacementComputeValue, ExampleAssembly"/>