GridView的選定索引在按鈕單擊上的值爲-1

Question

我在每一行上都有一個GridView和ImageButton。我想通過單擊按鈕從模板字段獲取值。我在button_click中使用了SelectedIndex。

但SelectedIndex總是-1。

我試過的代碼如下。

protected void ImageButton1_Click(object sender, ImageClickEventArgs e) 
    { 
     int i = GridView1.SelectedIndex; 
     Label t = (Label)GridView1.Rows[i].Cells[0].FindControl("Label1"); 
     Session["course"] = t.Text; 
     Response.Redirect("registration.aspx"); 
    } 

Answer 1

在這種情況下，你可以去行命令，你可以有圖像按鈕的點擊事件。

Grid View Row command

希望這有助於。

Answer 2

你不會在ButtonClick事件得到的SelectedIndex

所以嘗試這樣

protected void imgbtn_Click(object sender, EventArgs e) 
{ 
    try { 
     // Get the button that raised the event 
     LinkButton lnkbtn = (LinkButton)sender; 
     // Get the row that contains this button 
     GridViewRow gvRow = (GridViewRow)lnkbtn.NamingContainer; 
     // Get rowindex 
     int i = gvRow.RowIndex; 
     Label t = (Label)GridView1.Rows[i].Cells[0].FindControl("Label1"); 
     Session["course"] = t.Text; 
     Response.Redirect("registration.aspx"); 
     } 
    } catch (Exception ex) { 

    } 
} 

protected void grdview1_RowCommand(object sender, GridViewCommandEventArgs e) 
{ 
    try { 
     if ((e.CommandName == "ImageButton")) { 
      // Get RowIndex 
      int RowIndex = Convert.ToInt32(e.CommandArgument); 
      // Get Row 
      GridViewRow gvr = grdPhone.Rows(RowIndex); 
     } 
    } catch (Exception ex) 
     { 

    } 
} 

ASPX：

在GridView的

你需要設置的CommandName和論證像此

<asp:TemplateField ShowHeader="false"> 
<ItemTemplate> 
    <asp:ImageButton ID="imgbtn" runat="server" OnClick="imgbtn_Click" CausesValidation="false" CommandName="ImageButton" CommandArgument='<%# Container.DataItemIndex %>'>Edit</asp:ImageButton > 
    </ItemTemplate> 
    </asp:TemplateField>