排序的GridView不起作用

Question

我有asp.net頁面包含的GridView如下

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
        OnPageIndexChanging="gridView_PageIndexChanging" 
        OnSorting="TaskGridView_Sorting" 
        AllowSorting="True" AutoGenerateColumns="False" 
        onselectedindexchanged="GridView1_SelectedIndexChanged" 
        BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" 
        CellPadding="3" CellSpacing="2"> 
        <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" /> 
        <Columns> 
         <asp:boundfield datafield="name_english" convertemptystringtonull="true" headertext="Name"/> 
         <asp:BoundField DataField="Inc_ID" convertemptystringtonull="true" HeaderText="Inc_ID" SortExpression="Inc_ID"/> 
         <asp:BoundField DataField="UID" HeaderText="Study_UID" SortExpression= "UID"/> 
        </Columns> 
        <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" /> 
        <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" /> 
        <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" /> 
        <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" /> 
       </asp:GridView> 

我填寫，並使用下面的代碼

 protected void Button1_Click(object sender, EventArgs e) 
     { 
      //connection to database 
      string connection = System.Configuration.ConfigurationManager.ConnectionStrings["NorthindConnectionString"].ConnectionString; 
      SqlConnection myConn = new SqlConnection(connection); 
      myConn.Open(); 
      SqlCommand cmd = new SqlCommand(" WorkList", myConn); 
      cmd.CommandType = CommandType.StoredProcedure; 
      cmd.Parameters.Add(new SqlParameter("@Name", TextBox1.Text)); 
      cmd.Parameters.Add(new SqlParameter("@ID", TextBox2.Text)); 
      cmd.Parameters.Add(new SqlParameter("@AccNo", TextBox4.Text)); 


      SqlDataAdapter da = new SqlDataAdapter(cmd); 
      DataSet ds = new DataSet(); 
      da.Fill(ds); 
      GridView1.DataSource = ds; 
      GridView1.DataBind(); 

      Session["TaskTable"] = ds.Tables[0]; 

      ds.Dispose(); 
      da.Dispose(); 
      GridView1.Visible = true; 

      myConn.Close(); 


     } 
protected void TaskGridView_Sorting(object sender, GridViewSortEventArgs e) 
     { 

      //Retrieve the table from the session object. 
      DataTable dt = Session["TaskTable"] as DataTable; 

      if (dt != null) 
      { 

       //Sort the data. 
       dt.DefaultView.Sort = e.SortExpression + " " + GetSortDirection(e.SortExpression); 
       GridView1.DataSource = Session["TaskTable"]; 
       GridView1.DataBind(); 
      } 

     } 



     private string GetSortDirection(string column) 
     { 

      // By default, set the sort direction to ascending. 
      string sortDirection = "ASC"; 

      // Retrieve the last column that was sorted. 
      string sortExpression = ViewState["SortExpression"] as string; 

      if (sortExpression != null) 
      { 
       // Check if the same column is being sorted. 
       // Otherwise, the default value can be returned. 
       if (sortExpression == column) 
       { 
        string lastDirection = ViewState["SortDirection"] as string; 
        if ((lastDirection != null) && (lastDirection == "ASC")) 
        { 
         sortDirection = "DESC"; 
        } 
       } 
      } 

      // Save new values in ViewState. 
      ViewState["SortDirection"] = sortDirection; 
      ViewState["SortExpression"] = column; 

      return sortDirection; 
     } 


    } 

問題對其進行排序時，點擊任何標題排序引發錯誤System.IndexOutOfRangeException：找不到列名..，任何想法來解決這個問題，我肯定從數據庫中的列名，

Answer 1

你需要綁定你的網格到排序的視圖（a nd不是原始表格），以便排序工作。

protected void TaskGridView_Sorting(object sender, GridViewSortEventArgs e) 
{ 
    //Retrieve the table from the session object. 
    DataTable dt = Session["TaskTable"] as DataTable; 

    if (dt != null) 
    { 

     //Sort the data. 
     dt.DefaultView.Sort = e.SortExpression; 
     GridView1.DataSource = dt.DefaultView; 
     GridView1.DataBind(); 
    } 
} 

我不確定您是否需要GetSortDirection方法。

另請注意，SortExpression屬性由排序方向組成（例如「UID DESC」），因此您的邏輯基於此。您的代碼可能會設置排序表達式，如「UID DESC ASC」，這顯然是錯誤的表達方式。

Answer 2

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 void gridView_Sorting(object sender, GridViewSortEventArgs e) 
    { 
     DataTable dataTable = gridView.DataSource as DataTable; 

     if (dataTable != null) 
     { 
      DataView dataView = new DataView(dataTable); 
      dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection); 

      gridView.DataSource = dataView; 
      gridView.DataBind(); 
     } 
    } 

試試這個代碼..

Answer 3

爲了在asp.net的代碼工作或網絡環境中，你需要把你的GridView在會話的會話對象，你在視圖中排序州。爲了使分類與分頁一起工作，請執行以下操作。

protected void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
     Session["SearchTable"] = gv_GridView.DataSource; 
     LoadSearchGrid("Select * from WF_Search); 
} 
private void LoadSearchGrid(string query) 
{ 
    DataTable dsp = new DataTable(); 
    conn = new SqlConnection(ConnectionString); 
    SqlDataAdapter sda = new SqlDataAdapter(query, conn); 
    conn.Open(); 
    sda.Fill(dsp); 
    Session["SearchTable"] = dsp; 
    gv_GridView.DataSource = Session["SearchTable"]; 
    gv_GridView.DataBind(); 
    conn.Close(); 
    sda.Dispose(); 
} 
protected void gv_GridView_Sorting(object sender, GridViewSortEventArgs e) 
{ 
    ViewState["SortDirection"] = e.SortDirection; 
    DataTable dtr = Session["SearchTable"] as DataTable; 
    if (dtr != null) 
    { 
     dtr.DefaultView.Sort = e.SortExpression + " " + getSortDirection(e.SortExpression); 
     gv_GridView.DataSource = Session["SearchTable"]; 
     gv_GridView.DataBind(); 
     Session["SearchTable"] = gv_GridView.DataSource; 
    } 
} 
private string getSortDirection(string column) 
{ 
    string sortDirection = "ASC"; 
    string sortExpression = ViewState["SortDirection"] as string; 
    if (sortExpression != null) 
    { 
     if (sortExpression == column) 
     { 
      string lastDirection = ViewState["SortDirection"] as string; 
      if (lastDirection != null && lastDirection == "ASC") 
      { 
       sortDirection = "DESC"; 
      } 
     } 
    } 
    ViewState["SortDirection"] = sortDirection; 
    ViewState["SortExpression"] = column; 

    return sortDirection; 
} 
protected void gv_GridView_PageIndexChanging(object sender, GridViewPageEventArgs e) 
{ 
    gv_GridView.DataSource = Session["SearchTable"]; 
    gv_GridView.DataBind(); 
    gv_GridView.PageIndex = e.NewPageIndex; 

}