不转换为 DataTable 的自动搜索过滤器

Question

HI i have a textbox and a gridview. May i know what is the best way to have something type in the textbox and it auto filter the gridview based on a keyword eg Name

i have done that successfuly but with the condition only if it converted to dataTable.
bsCourse.DataSource = linqHelper.ToDataTable(course.Get() as List<Course>); gvCourse.DataSource = bsCourse;

 private void txtSearch_TextChanged(object sender, EventArgs e)
    {
        string input = txtSearch.Text.Trim().ToLower();
        if (input.Length > 0)
            bsCourse.Filter = "Name like '" + input + "%'";
        else
            bsCourse.Filter = "";
    }

Is there a better without converting the data to the datatable for this auto filter search? i am using linq to sql. Thanks

Answer 1

I usually filter out which rows to hide by using regular expressions. In this example I've used an UltraGrid (Infragistics), but the procedure would probably be something along the same lines for a gridview.

private void searchBox_TextChanged(object sender, EventArgs e)
{
    if (gridUsers.Rows.Count > 0)
    {
        foreach (UltraGridRow row in gridUsers.Rows)
        {
            if (Regex.IsMatch(row.Cells[1].Value.ToString(), searchBox.Text, RegexOptions.IgnoreCase))
            {
                gridUsers.Rows[indexCounter].Hidden = false;
            }
            else
            {
                gridUsers.Rows[indexCounter].Hidden = true;
            }
        }
    }
}

It might not be the best way (especially not for very large grids with a lot of rows), but it works for me.

Answer 2

You can try the Linq approach, this way:

List<Course> courses = (from i in course.Get() 
                        select new Course() {
                             // Set your property value here.
                        }).ToList();

bsCourse.DataSource = courses;