线程问题（线程间操作无效: 从不是创建控件“results”的线程访问它。）
private void button1_Click(object sender, EventArgs e)
  {
  results.Items.Clear();
  string addr = address.Text;
  Object state = new Object();

  OnResovled = new AsyncCallback(Resolved);
   
   
  Dns.BeginResolve(addr, OnResovled, state);
  }

  private void Resolved(IAsyncResult ar)
  {
  string buffer;
  IPHostEntry iphe = Dns.EndResolve(ar);
  buffer = "Host name:" + iphe.HostName;
  results.Items.Add(buffer);

  foreach (string alias in iphe.Aliases)
  {
  buffer = "Alias:" + alias;
  results.Items.Add(buffer);

  }

  foreach (IPAddress addrs in iphe.AddressList)
  {
  buffer = "Address:" + addrs.ToString();
  results.Items.Add(buffer);
  }
  }

运行报错：线程间操作无效: 从不是创建控件“results”的线程访问它。


------解决方案--------------------

探讨

public Form1()
{
InitializeComponent();
Form1.CheckForIllegalCrossThreadCalls = false;// 设置为FLASE

}

------解决方案--------------------

C# code

 private void Resolved(IAsyncResult ar) 
{ 
if (this.InvokeRequired)
{
  OnResovled = new AsyncCallback(Resolved); 
  this.Invoke(OnResovled , new object[] { ar});
}
else
{           
            string buffer; 
            IPHostEntry iphe = Dns.EndResolve(ar); 
            buffer = "Host name:" + iphe.HostName; 
            results.Items.Add(buffer); 

            foreach (string alias in iphe.Aliases) 
            { 
                buffer = "Alias:" + alias; 
                results.Items.Add(buffer); 

            } 

            foreach (IPAddress addrs in iphe.AddressList) 
            { 
                buffer = "Address:" + addrs.ToString(); 
                results.Items.Add(buffer); 
            } 
 }
}