c# - 明确实现的方法具有什么可访问性？

显式接口方法具有private访问级别。

让我们看一下（在Reflection的帮助下）：

  using System.Reflection;

 ...

  var result = typeof(Test)
    .GetMethods(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
    .Select(info => $"{(info.IsPrivate ? "private" : "not private")} {info.Name}");

  string report = string.Join(Environment.NewLine, result);

  Consolw.Write(report);

结果：

private WFA_Junk_4.Form1.ITest.Test // <- Method of interest
not private Equals
not private GetHashCode
not private Finalize
not private GetType
not private MemberwiseClone
not private ToString  

因此，我们无法明确执行它们：

Test test = new Test();

// ITest.Test() call which is OK
(test as ITest).Test();

// Doesn't compile: 
//   1. Private method
//   2. Wrong name; should be typeof(ITest).FullName.Test() which is not allowed 
test.Test(); 

由于我们不能按原样放置方法名称，因此，我可以看到ITest.Test直接调用的唯一方法是反射：

class Test : ITest {
  ...
  public void SomeMethod() 
  {
     // we can't put method's name as it is `SomeNamespace.ITest.Test`
     // Let's find it and execute
     var method = this
       .GetType()
       .GetMethod($"{(typeof(ITest)).FullName}.Test", 
                    BindingFlags.Instance | BindingFlags.NonPublic);

     method.Invoke(this, new object[0]);
  }