在ASP.NET Gridview中排序

Question

其Arun。這次我在ASP.Net中有一個排序問題。對於第一次點擊，降序工作正常，但在第二次點擊升序不再採取。它仍然以降序排列。我使用Tableadapter來顯示gridview內容。請檢查代碼並將我改正到我錯過的地方。

protected void gv1_Sorting(object sender, GridViewSortEventArgs e) 
    { 
     string sdir = e.SortDirection == SortDirection.Ascending ? "DESC" : "ASC"; 
     DataView dv = new DataView(ds2.AllocationPending(ClientLoggedIn.Text)); 
     dv.Sort = e.SortExpression + " " + sdir; 
     gv1.DataSource = dv; 
     gv1.DataBind(); 
    } 

也請解釋 - 是否有任何其他方式來應用沒有Dataview的排序。

謝謝。

Answer 1

我已經找到了這個問題的解決方案。原因是e.SortDirection總是返回Ascending。所以我需要將e.SortDirection存儲在ViewState中，並使用該值對數據視圖進行排序。更新編碼如下：

protected void gv1_Sorting(object sender, GridViewSortEventArgs e) 
    { 
     string SortDirection = "DESC"; 
     if (ViewState["SortExpression"] != null) 
     { 
      if (ViewState["SortExpression"].ToString() == e.SortExpression) 
      { 
       ViewState["SortExpression"] = null; 
       SortDirection = "ASC"; 
      } 
      else 
      { 
       ViewState["SortExpression"] = e.SortExpression; 
      } 
     } 
     else 
     { 
      ViewState["SortExpression"] = e.SortExpression; 
     } 

     DataView dv = new DataView(ds2.AllocationPending(ClientLoggedIn.Text)); 
     dv.Sort = e.SortExpression + " " + SortDirection; 
     gv1.DataSource = dv; 
     gv1.DataBind(); 
    } 

Answer 2

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e) 
    {  
     DataTable dtSortTable = GridView1.DataSource as DataTable; 

     if (dtSortTable != null) 
     { 
      DataView dvSortedView = new DataView(dtSortTable); 

      dvSortedView.Sort = e.SortExpression + "" + getSortDirectionString(e.SortDirection); 

      GridView1.DataSource = dvSortedView; 
      GridView1.DataBind(); 
     } 
    } 

private string getSortDirectionString(SortDirection sortDirection) 
    { 
     string newSortDirection = String.Empty; 
     if(sortDirection== SortDirection.Ascending) 
     { 
      newSortDirection = "DESC"; 
     } 
     else 
     { 
      newSortDirection = "ASC"; 
     } 
     return newSortDirection; 
} 

試試這個代碼排序的GridView控件

Answer 3

[GridView的驚人鏈接到微軟] [1]

http://msdn.microsoft.com/en-us/library/vstudio/ms228113(v=vs.90).aspx