update

PLCDataReader/ClassFile/ModeBusTCPServer.cs

@@ -125,7 +125,13 @@ namespace ClassFile
                     {
                         int index = SelectIP.Items.IndexOf(item.RemoteEndPoint.ToString());
                         SelectIP.Items.RemoveAt(index);
-                        SelectIP.Update();
+                        if (SelectIP.Items.Count > 0)
+                        {
+                            if (SelectIP.Text == "")
+                                SelectIP.Text = SelectIP.Items[0].ToString();
+                        }
+                        else
+                            SelectIP.Text = "";
                         richtext.AppendText("客户端" + item.RemoteEndPoint + "已经中断连接" + "\r\n");
 
                         if (list.Contains(item))
@@ -219,7 +225,13 @@ namespace ClassFile
                         //提示套接字监听异常  
                         int index = SelectIP.Items.IndexOf(socketServer.RemoteEndPoint.ToString());
                         SelectIP.Items.RemoveAt(index);
-                        SelectIP.Update();
+                        if (SelectIP.Items.Count > 0)
+                        {
+                            if (SelectIP.Text == "")
+                                SelectIP.Text = SelectIP.Items[0].ToString();
+                        }
+                        else
+                            SelectIP.Text = "";
                         richtext.AppendText("客户端" + socketServer.RemoteEndPoint + "已经中断连接" + "\r\n");
                     }
                     if (list.Contains(socketServer))
@@ -237,7 +249,13 @@ namespace ClassFile
                 {
                     int index = SelectIP.Items.IndexOf(socketServer.RemoteEndPoint.ToString());
                     SelectIP.Items.RemoveAt(index);
-                    SelectIP.Update();
+                    if (SelectIP.Items.Count > 0)
+                    {
+                        if (SelectIP.Text == "")
+                            SelectIP.Text = SelectIP.Items[0].ToString();
+                    }
+                    else
+                        SelectIP.Text = "";
                     richtext.AppendText("客户端" + socketServer.RemoteEndPoint + "已经中断连接" + "\r\n");
                 }
                 if (list.Contains(socketServer))