[英]How to implement sorting functionality in gridview?
I am trying to implement sorting functionality in grid view but its not working.. Code: 我试图在网格视图中实现排序功能,但它无法正常工作..代码:
//enter code here
public partial class _Default : System.Web.UI.Page
{
SqlConnection con;
SqlCommand cmd;
DataSet ds;
SqlDataAdapter da;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Session["myDataSet"] = FillDataSet();
}
}
private string ConvertSortDirectionToSql(SortDirection sortDirection)
{
string newSortDirection = String.Empty;
switch (sortDirection)
{
case SortDirection.Ascending:
newSortDirection = "ASC";
break;
case SortDirection.Descending:
newSortDirection = "DESC";
break;
}
return newSortDirection;
}
protected DataSet FillDataSet()
{
string source = "Database=GridTest;Server=Localhost;Trusted_Connection=yes";
con = new SqlConnection(source);
cmd = new SqlCommand("proc_mygrid", con);
ds = new DataSet();
da = new SqlDataAdapter(cmd);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
return ds;
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
//DataSet ds = FillDataSet();
DataTable dt = ((DataSet)Session["myDataSet"]).Tables[0];
if (dt != null)
{
dt.DefaultView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);
GridView1.DataSource = dt;
GridView1.DataBind();
}
Can somebody suggest where I am going wrong? 有人可以建议我哪里出错吗?
EDIT: 编辑:
enter code here DataTable dtbl = ((DataSet)Session["myDataSet"]).Tables[0];
dtbl.DefaultView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);
GridView1.DataSource = dtbl;
GridView1.DataBind();
Here is the running code: 这是运行代码:
private string GetSortDirection(string column)
{
string sortDirection = "DESC";
string sortExpression = ViewState["SortExpression"] as string;
if (sortExpression != null)
{
if (sortExpression == column)
{
string lastDirection = ViewState["SortDirection"] as string;
if ((lastDirection != null) && (lastDirection == "DESC"))
{
sortDirection = "ASC";
}
}
}
ViewState["SortDirection"] = sortDirection;
ViewState["SortExpression"] = column;
return sortDirection;
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dtbl = ((DataSet)Session["myDataSet"]).Tables[0];
dtbl.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression);
GridView1.DataSource = dtbl;
GridView1.DataBind();
} }
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