参见英文答案 >
Conflicting overloaded methods with optional parameters 3个
为什么C#编译器不会对具有默认参数的方法感到困惑?
为什么C#编译器不会对具有默认参数的方法感到困惑?
在下面的代码中SayHello()可以参考:
> SayHello()
> SayHello(字符串arg1 = null)
> SayHello(字符串arg1 = null,字符串arg2 = null)
> SayHello(string arg1 = null,string arg2 = null,string arg3 = null)
class Program { private static void SayHello() { Console.WriteLine("Hello 1"); return; } private static void SayHello(string arg1 = null) { Console.WriteLine("Hello 2"); return; } private static void SayHello(string arg1 = null,string arg2 = null) { Console.WriteLine("Hello 3"); return; } private static void SayHello(string arg1 = null,string arg3 = null) { Console.WriteLine("Hello 3"); return; } private static void Main(string[] args) { SayHello(); // SayHello() invoked,but SayHello(string arg1 = null) not invoked. SayHello("arg1"); SayHello("arg1","arg2","arg3"); // Output is: // Hello 1 // Hello 2 // Hello 3 return; } }