Question

我正在上课，其中一些例子是在C＃中。由于我的笔记本电脑运行Linux，我在Ubuntu上使用Mono 2.6.7。

我正在尝试编译以下代码：

using System.Net.Sockets;
using System.Net;
using System;

/// <summary>
/// Example program showing simple TCP socket connections in C#.NET.
/// Rather than reading and writing byte arrays, this example show
/// how to use a stream reader in the client.
/// TCPSocketServer is the socket server.
/// <author>Tim Lindquist ASU Polytechnic Department of Engineering</author>
/// <version>September, 2009</version>
/// </summary>
public class TCPSocketServer {

  public static void Main (string [] args) {
    IPAddress ipAddress = Dns.GetHostEntry("localhost").AddressList[0];
    TcpListener tcpl = new TcpListener(ipAddress, 9090);
    tcpl.Start();
    Console.WriteLine("TCPSocketServer waiting for connections on 9090");
    Socket sock = tcpl.AcceptSocket();
    string msg = "Hello Client";
    Byte[] msgBytes = System.Text.Encoding.ASCII.GetBytes(msg);
    sock.Send(msgBytes, msgBytes.Length, SocketFlags.DontRoute);
    Console.WriteLine("Message-Hello Client-sent to client.");
    tcpl.Stop();
    sock.Close();
  }
}

当我编译代码时，我得到：

/home/vivin/Projects/cst420/CSSockets/src/TCPSocketServer.cs(16,31): error CS0122: `System.Net.Dns.GetHostEntry(string)' is inaccessible due to its protection level
/usr/lib/mono/gac/System/1.0.5000.0__b77a5c561934e089/System.dll (Location of the symbol related to previous error)
ompilation failed: 1 error(s), 0 warnings

我是C＃新手;这是我编写的第一个C＃程序。我尝试在谷歌上搜索，但我没有得到很多关于这个问题的点击。这是Mono的问题吗？

Answer 1

System.Net.Dns.GetHostEntry是在 .NET Framework 2.0 中引入的。在Mono的实现中，它也出现在2.0之前的版本中，但标记为internal而不是public。您似乎正在编译 .NET Framework 1.0 。

来自/mcs/class/System/System.Net/Dns.cs：

#if NET_2_0
    public
#else
    internal
#endif
    static IPHostEntry GetHostEntry (string hostNameOrAddress)
    {
        // ...

Answer 2

您使用的是gmcs编译器吗？

Mono称由于其保护级别，'System.Net.Dns.GetHostEntry（string）'无法访问

2 个答案: