C#判断指定文件是否是只读的方法

using System;
using System.IO;
static class Test
{
 static void Main()
 {
   FileInfo file = new FileInfo("test.cs");
   Console.WriteLine(file.Attributes.ToString());
   if(file.Attributes == FileAttributes.ReadOnly)
   {
    Console.WriteLine("File is read-only (faulty test).");
   }
   if((file.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
   {
    Console.WriteLine("File is read-only (correct test).");
   }
 }
}