我想测试连接字符串是否正确,所以我创建了一个新的SqlConnection,称为Open()方法。但是当连接字符串的server / data_source部分错误时,我必须等待很长时间才能返回。
我尝试将连接超时添加到连接字符串,但它不起作用; 我尝试在另一个线程中打开连接,然后在几秒钟后调用Thread.Abort()。 他们都没有工作。
那么这样做的正确方法是什么? 感谢。
答案 0 :(得分:1)
经过研究,我找到了解决方案(http://www.improve.dk/blog/2008/03/10/controlling-sqlconnection-timeouts),我稍微修改了一下。如果没有抛出异常,则连接字符串有效。
var alive = true;
string error = null;
var success = false;
// ReSharper disable AccessToModifiedClosure
// ReSharper disable UseObjectOrCollectionInitializer
var thread = new Thread(() =>
{
try
{
var connection = new SqlConnection(connectionString);
connection.Open();
connection.Close();
if (alive)
success = true;
}
catch (SqlException ex)
{
if (alive)
error = ex.Message;
}
catch (ThreadAbortException)
{
}
finally
{
if (connection.State == ConnectionState.Open)
connection.Close();
}
});
// ReSharper restore AccessToModifiedClosure
// ReSharper restore UseObjectOrCollectionInitializer
thread.IsBackground = true;
var sw = Stopwatch.StartNew();
thread.Start();
var timeout = TimeSpan.FromSeconds(3);
while (sw.Elapsed < timeout)
thread.Join(TimeSpan.FromMilliseconds(200));
sw.Stop();
if (!success)
{
alive = false;
throw new Exception(error ?? "Connection timeout, please check the connection string.");
}