要检查超时，我相信您检查 ex.Number 的值.如果它是-2，那么你有一个超时情况.

To check for a timeout, I believe you check the value of ex.Number. If it is -2, then you have a timeout situation.

-2 是超时的错误代码，从 SQL Server 的 MDAC 驱动程序 DBNETLIB 返回.这可以通过下载 Reflector 并在 System.Data.SqlClient.TdsEnums 下查看来查看对于 TIMEOUT_EXPIRED.

-2 is the error code for timeout, returned from DBNETLIB, the MDAC driver for SQL Server. This can be seen by downloading Reflector, and looking under System.Data.SqlClient.TdsEnums for TIMEOUT_EXPIRED.

您的代码将显示为:

if (ex.Number == -2)
{
     //handle timeout
}

证明失败的代码:

try
{
    SqlConnection sql = new SqlConnection(@"Network Library=DBMSSOCN;Data Source=YourServer,1433;Initial Catalog=YourDB;Integrated Security=SSPI;");
    sql.Open();

    SqlCommand cmd = sql.CreateCommand();
    cmd.CommandText = "DECLARE @i int WHILE EXISTS (SELECT 1 from sysobjects) BEGIN SELECT @i = 1 END";
    cmd.ExecuteNonQuery(); // This line will timeout.

    cmd.Dispose();
    sql.Close();
}
catch (SqlException ex)
{
    if (ex.Number == -2) {
        Console.WriteLine ("Timeout occurred");
    }
}