超时在SQL连接不工作

Question

我有这个简单的代码来测试一个DB已准备就绪：

Function testlocalcon() As Boolean 
    Dim constr As String = _clconstr 

    Try 
     Using t As New SqlConnection() 
      constr = constr & " ; Connect Timeout=1" 

      If Not t.State = Data.ConnectionState.Open Then 
       t.ConnectionString = constr 

       t.Open() 
       If t.State = Data.ConnectionState.Open Then 
        Return True 
       Else 
        Return False 
       End If 
      Else 
       Return True 
      End If 
     End Using 
    Catch ex As Exception 
     Return False 
    End Try 
End Function 

我不想执行查询时，只检查连接，但无论什么时候out参数被忽略。我在这里搜索（Stackoverflow）和互联网，并没有发现如何解决这个问题。

其他任何人都有这个问题？或者，有没有关于如何让应用程序知道数据库已准备好的其他想法？

Answer 1

我为代码差异appologize，但这是C＃，我已经在过去使用它。它非常简单，应该可读。

private SQLServerConnection 
private SqlConnection _SQLServerConnection; 
public SqlConnection SQLServerConnection 
    { 
     get 
     { 
      return _SQLServerConnection; 
     } 
     set 
     { 
      _SQLServerConnection = value; 
     } 
    } 

private void SetSQLServerConnectionString (string sqlServerName, string databaseName, string saPassword, int connectTimeout) 
{ 
    SQLServerConnection = new SqlConnection("Password=" + saPassword + ";Persist Security Info=True;User ID=sa;Initial Catalog=" + databaseName + ";Data Source=" + sqlServerName + ";connection timeout=" + connectTimeout.ToString(CultureInfo.InvariantCulture)); 
} 

internal bool TestSQLServerConnection(string sqlServerName, string databaseName, string saPassword, int connectTimeout) 
{ 
    try 
    { 
     SetSQLServerConnectionString(sqlServerName, databaseName, saPassword, connectTimeout); 
     SQLServerConnection.Open(); 
     return true; 
    } 
    catch (SqlException e) 
    { 

     return false; 
    } 
    finally 
    { 
     SQLServerConnection.Close(); 
    } 
}