class1.cs

C#开发教程 由浅入深 配有实例 是初学者的好帮手

using System;
using System.Security;
using System.Security.Permissions;

namespace GetPerm
{
    class GetPermApp
    {
        [STAThread]
        static void Main(string[] args)
        {
            FileIOPermission filePerm = new FileIOPermission(
                FileIOPermissionAccess.Read, "C:\\Foo.txt");
            try
            {
                filePerm.Demand();
                Console.WriteLine("We have permission to read the file");
            }
            catch (SecurityException e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}