明确实现带有可选参数的接口时发出警告

 public interface ITestInterface
 {
     void TestOptional(int a = 5, int b = 10, object c = null);
 }

 public class TestClass : ITestInterface
 {

     void ITestInterface.TestOptional(int a = 5, int b = 5, object c = null)
     {
        Console.Write(\"a=\" + a + \" b=\" + b + \" c=\" + c);
     }
 }

class Program
{
    static void Main(string[] args)
    {
        ITestInterface test = new TestClass();
        test.TestOptional();
        Console.ReadLine();
    }
}

a=5 b=10 c=

void ITestInterface.TestOptional(int a = 5, int b = 5, object c = null)

void ITestInterface.TestOptional(int a, int b, object c)