从Gridview更新图表-Gridview更新后更新图表

Question

I have a GridView and a chart. I am plotting the time lapsed data from the Gridview.

Problem: The chart does not gets updated at the same time GridView does. It is always one step back (requires one extra click).

Mechanism: This is a time lapsed plot. There is a start and end date and I am plotting them in particular way. So I read the values in the Grid in page_load function

foreach (GridViewRow row in GridView1.Rows)
        {
         // read the values that I need from the Grid
         // and assign them to chart to create the chart
        }

GridView1.DateBind();
Char1.DataBind();

I tried the page refresh approach but that did not work. I am trying to figure out, am I doing something wrong? The 3D button works fine by the way and one of the thing it does wrong: it executes the actual query from SQLDataSource, not the one I created on the fly.

Suspicion: I am suspecting SQLDataSource for the problem. I have put one on ASPX page. I change the SQL Query on fly and I think that could be a problem?

Answer 1

Are you using some UpdatePanel?

Maybe you can try something like this:

DataTable dt = new DataTable();
dt.Columns.Add("Column1");
dt.Columns.Add("Column2");

foreach (GridViewRow row in GridView1.Rows)
{
    dt.Rows.Add(GridView1.HeaderRow.Cells[0].Text, row.Cells[0].Text);
}

cht.DataSource = dt;

cht.Series["serie"].XValueMembers = "Column1";
cht.Series["serie"].YValueMembers = "Column2";

cht.DataBind();