在C＃中从服务器端异步调用javascript函数

Question

this is my code :

protected void BtnImport_Click(object sender, EventArgs e)
{
   List<DataTable> tb = Helper.SplitTableToManyTables(FileTb, 50); // a list containing multiple DataTable each have 50 rows
        int importedRowsCount = 0;
        for (int KLoop = 0; KLoop < tb.Count; KLoop++)
        { 
        ...
   if (QueriesDataHelper.ImportContacts(resTb, int.Parse(TxtHiddenGroupId.Value), Session)) 
            {
                importedRowsCount += resTb.Rows.Count;
                var script = "DisplayProgressMsg(" + importedRowsCount + ")";
                ScriptManager.RegisterStartupScript(this, GetType(), "MyScript", script, true);
                if (KLoop == tb.Count - 1)
                    MessageBox.Show(importedRowsCount.ToString()+" Contacts imported successfully");
            }
    }
}

QueriesDataHelper.ImportContacts is a function that take a dataTable containing 50 rows and send it to a stored procedure

my problem is RegisterStartupScript is beeing executed after all the dataTables are beiing inserted i want to display a ms after the first DataTable finish tha

Answer 1

Ok,

Http is request/response protocol. But you want send do multiple responses for single request.

I see two ways for you. In both, you will have to run your long running process in separate thread. Then

1) use ajax, to ask server about progress every N seconds, and display result. Client's will track progress with some delay

2) web sockets( SignalR is great for such purposes). In this way you will be able to display progress in real time, but i think it's harder to implement