linux - Dns 不包含 `GetHostEntry' 的定义

Question

我来了from powershell 到 Mono:

thufir@dur:~/mono$ 
thufir@dur:~/mono$ ls
hello.cs
thufir@dur:~/mono$ 
thufir@dur:~/mono$ cat hello.cs 
using System;

public class HelloWorld
{
    static public void Main ()
    {
        Console.WriteLine ("Hello Mono World");
    }
}

thufir@dur:~/mono$ 
thufir@dur:~/mono$ mcs hello.cs 
thufir@dur:~/mono$ 
thufir@dur:~/mono$ mono hello.exe 
Hello Mono World
thufir@dur:~/mono$ 
thufir@dur:~/mono$ dotnet --version
2.1.4
thufir@dur:~/mono$ 
thufir@dur:~/mono$ lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 17.10
Release:    17.10
Codename:   artful
thufir@dur:~/mono$ 

我正在寻找类似这样的powershell one-liner:

Resolve-DnsName -Name localhost -Type ANY | Format-Table -AutoSize

但是来自 Mono。这是 what I have到目前为止:

thufir@dur:~/mono$ 
thufir@dur:~/mono$ ls
dns.cs  hello.cs
thufir@dur:~/mono$ 
thufir@dur:~/mono$ mcs dns.cs 
dns.cs(10,35): error CS0117: `Dns' does not contain a definition for `GetHostEntry'
dns.cs(5,14): (Location of the symbol related to previous error)
dns.cs(11,28): error CS0118: `System.Net.IPAddress' is a `type' but a `variable' was expected
dns.cs(11,28): error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected
Compilation failed: 3 error(s), 0 warnings
thufir@dur:~/mono$ 
thufir@dur:~/mono$ cat dns.cs 
using System.Net.Sockets;
using System.Net;
using System; 

public class Dns
{
    static public void Main ()
    {
        Console.WriteLine ("Hello Mono World");
        IPAddress ipAddress = Dns.GetHostEntry("localhost").AddressList[0];
        Console.WriteLine (IPAddress);  
    }
}

thufir@dur:~/mono$ 

dotnet 的版本是否正确？导入是否正确？

我是否没有使用正确的类型正确声明和实例化 ipaddress 变量？

Answer 1

您自己的类名 Dns 正在覆盖 System.Net 命名空间。试试这个:

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

public class MyDns
{
    static public void Main()
    {
           Console.WriteLine("Localhost: ");
           IPAddress ip = Dns.GetHostEntry("localhost").AddressList[0];
           Console.WriteLine(ip);
    }
}