C#DNS域名解析工具(DnsLookup)

DNS域名解析工具：DnsLookup

輸入域名后點擊Resolve按鈕即可。

主要實現代碼如下：

 private void btnResolve_Click ( object sender, EventArgs e ) {
lstIPs.Items.Clear ( );  //首先把結果里的ListBox清空  
try {
IPHostEntry iphost = Dns.GetHostEntry ( txtInput.Text );   //解析主機 
foreach ( IPAddress  ip in iphost.AddressList ) {   //iphost.AddressList這里面是從主機上獲取的所有的IP，所以要用Foreach遍歷出來
string ipaddress = ip.AddressFamily.ToString ( );
lstIPs.Items.Add ( ipaddress );
lstIPs.Items.Add ("  "+ip.ToString ());
}
txtHostName.Text  = iphost.HostName;   //主機名 
            }
catch ( Exception ex) {
MessageBox.Show ( "Unable to process the request because" +
" the following problem occurred:\n" +
ex.Message, "Exception occurred" );  //這里是異常處理  例如網絡連接或主機不能解析等其它問題就顯示出來給用戶
            }
}
private void txtInput_KeyPress ( object sender, KeyPressEventArgs e ) {
if ( e.KeyChar==(char)13 ) {  //大家在敲完后都習慣性回車確定  這里就是在Input里輸入完后直接回車，相當于點擊了Resolve這個按鈕
btnResolve_Click ( this, null );
}
}