C# 判断另外一台服务器上某个文件是否存在

System.IO.File.Exist（filePath）在本地测试B服务器上文件是否存在 通过。放在A服务器上执行 测试B服务器文件是否存在失败。

解决方案：远程主机共享盘映射到本地

 #region 网络共享本地映射
 public class WNetHelper
 {

     [DllImport("mpr.dll", EntryPoint = "WNetAddConnection2")]
     private static extern uint WNetAddConnection2(NetResource lpNetResource, string lpPassword, string lpUsername, uint dwFlags);
     [DllImport("Mpr.dll", EntryPoint = "WNetCancelConnection2")]
     private static extern uint WNetCancelConnection2(string lpName, uint dwFlags, bool fForce);
     [StructLayout(LayoutKind.Sequential)]
     public class NetResource
     {
         public int dwScope;
         public int dwType;
         public int dwDisplayType;
         public int dwUsage;
         public string lpLocalName;
         public string lpRemoteName;
         public string lpComment;
         public string lpProvider;

     }
     /// <summary>  
     /// 为网络共享做本地映射
     /// </summary>  
     /// <param name="username">访问用户名（windows系统需要加计算机名，如：comp-1\user-1）</param>
     /// <param name="password">访问用户密码</param>  
     /// <param name="remoteName">网络共享路径（如：\\fs-01\暂存文件夹 (一定要路径，不可以带文件名全路径)</param> 
     /// <param name="localName">本地映射盘符</param>  
     /// <returns></returns>  
     public static uint WNetAddConnection(string username, string password, string remoteName, string localName)
     {
         NetResource netResource = new NetResource();
         netResource.dwScope = 2;
         netResource.dwType = 1;
         netResource.dwDisplayType = 3;
         netResource.dwUsage = 1;
         netResource.lpLocalName = localName;
         netResource.lpRemoteName = remoteName.TrimEnd('\\');
         uint result = WNetAddConnection2(netResource, password, username, 0);
         return result;

     }
     public static uint WNetCancelConnection(string name, uint flags, bool force)
     {
         uint nret = WNetCancelConnection2(name, flags, force);
         return nret;
     }
 }
 #endregion