SQL设置页面完成

Login.xaml.cs

@@ -15,6 +15,8 @@ using System.Windows.Media.Imaging;
 using System.Windows.Shapes;
 using System.Runtime.InteropServices;
 using System.Data.SqlClient;
+using System.Data;
+using System.Security.Policy;
 
 namespace formula_manage
 {
@@ -67,7 +69,7 @@ namespace formula_manage
         string TEXT_SQLUSER;
         string TEXT_SQLPASWOR;
         string Connstr_SC;
-        private void Window_Loaded(object sender, RoutedEventArgs e)
+        private async void Window_Loaded(object sender, RoutedEventArgs e)
         {
             logon.IsEnabled = false;  //关闭登录按钮
 
@@ -86,10 +88,21 @@ namespace formula_manage
                 Connstr_SC = "server=" + TEXT_SQLIP + ";database=" + TEXT_SQLNAME + ";User ID=" + TEXT_SQLUSER + ";Password=" + TEXT_SQLPASWOR;
             }
             SqlConnection conn_SC = new SqlConnection(Connstr_SC);
-            conn_SC.Open();
-         //   conn_SC.OpenAsync();
-            conn_SC.Close();
+         //   conn_SC.Open();
+            try
+            {
+               await conn_SC.OpenAsync();
+            }catch (Exception) 
+            {
+                System.Windows.MessageBox.Show("连接数据库失败");
 
+                Windows.Sql sql = new Windows.Sql();
+                sql.ShowDialog();//实例化并置顶打开数据库设置窗口 
+
+                return;
+            }   
+                
+            conn_SC.Close();  //关闭连接
 
             logon.IsEnabled = true;  //允许登录按钮
             UserClass.PressKey.PressKeys(Keys.Tab, false);