连接到SQL Server Express 2012的超时

Question

my application is asp.net MVC3, I am using SQLExpress 2012. I get the following error

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

when I try to run the following:

public static List<vw_MasterView> GetMasterView(DateTime? fromDate, DateTime? toDate)
{
    if (fromDate == null) fromDate = new DateTime(1900, 1, 1);
    if (toDate == null) toDate = DateTime.Now;
    using (DALDataContext ctx = new DALDataContext())
    {
        var q = from c in ctx.vw_MasterViews
                where c.FirstVisitDate >= fromDate && c.LastVisitDate <= toDate
                select c;
        return q.ToList();
    }
} 

I did increase the connection time (server / advance properties) to 6000.

When I run the view from the designer (in SQL Server) I get the same error message, however when I run the query (in SQL server) it works fine, it took 54 seconds to excute.

I would appreciate your suggestions, thanks in advance.

Answer 1

您可能需要设置DBContext的连接时间：

ctx.CommandTimeout = 200;

Answer 2

The default value of the DataContext class's CommandTimeout is set to 30 seconds. Any database queries taking a longer time to complete than 30 seconds (and as you wrote your is taking about 60) will throw a System.Data.SqlClient.SqlException: Timeout expired Exception .

If you look at the auto generated DALDataContext subclass you will a few partial method declarations, your point of interest should be OnCreated method. You can define the body of the OnCreated method in another partial class with the same full name as that of the auto generated class and set the desired timeout value there in the following way:

partial class DALDataContext : System.Data.Linq.DataContext
{
    partial void OnCreated()
    {
        this.CommandTimeout = 100;
    }
}