Compiler Error CS1061 · MSDN C# 编程指南 & 参考手册 2015

# Compiler Error CS1061 “type”不包含“member”的定义，并且找不到可接受类型为“type”的第一个参数的扩展方法“name”(是否缺少 using 指令或程序集引用?)。在尝试调用的方法或访问的类成员不存在时，将发生此错误。下面的示例生成 CS1061，因为 TestClass1 没有 DisplaySomething 方法。它没有名为 WriteSomething 的方法。该方法可能是此源代码的作者打算编写的方法。 ``` // cs1061.cs public class TestClass1 { // TestClass1 has one method, called WriteSomething. public void WriteSomething(string s) { System.Console.WriteLine(s); } } public class TestClass2 { // TestClass2 has one method, called DisplaySomething. public void DisplaySomething(string s) { System.Console.WriteLine(s); } } public class TestTheClasses { public static void Main() { TestClass1 tc1 = new TestClass1(); TestClass2 tc2 = new TestClass2(); // The following call fails because TestClass1 does not have // a method called DisplaySomething. tc1.DisplaySomething("Hello"); // CS1061 // To correct the error, change the method call to either // tc1.WriteSomething or tc2.DisplaySomething. tc1.WriteSomething("Hello from TestClass1"); tc2.DisplaySomething("Hello from TestClass2"); } } ``` ## 请参阅 [类和结构（C# 编程指南）](https://msdn.microsoft.com/zh-cn/library/ms173109.aspx) [扩展方法（C# 编程指南）](https://msdn.microsoft.com/zh-cn/library/bb383977.aspx)