如何在asp .net和c#中的gridview中啟用選定的行

Question

這是我的aspx：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" DataSourceID="SqlDataSource1" 
        OnRowCommand="GridView1_RowCommand" AutoGenerateSelectButton="True" EnablePersistedSelection="True">
        <Columns>
            <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" 
                ReadOnly="True" SortExpression="ID" />
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
            <asp:BoundField DataField="Class" HeaderText="Class" SortExpression="Class" />
            <asp:BoundField DataField="Section" HeaderText="Section" 
                SortExpression="Section" />
            <asp:BoundField DataField="Address" HeaderText="Address" 
                SortExpression="Address" />
            <asp:TemplateField HeaderText="Edit">
               <ItemTemplate>
                 <asp:Button runat="server" ID="btnedit" Text="Edit" CommandName="EditRow"></asp:Button>                    
               </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="Delete">
          <ItemTemplate>
                 <asp:Button runat="server" ID="btndelete" Text="Delete" CommandArgument='<%# Container.DataItemIndex %>' CommandName="Deleterow"></asp:Button>                    
               </ItemTemplate>
          </asp:TemplateField>            
        </Columns>
    </asp:GridView>

這是后面的代碼：

protected void btnsub_Click(object sender, EventArgs e)
        {
            SqlConnection con = Connection.DBconnection();
            if (Textid.Text.Trim().Length > 0)
            {

                SqlCommand com = new SqlCommand("StoredProcedure3", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@id", Textid.Text.Trim());
                com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
                com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
                com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
                com.Parameters.AddWithValue("@address", Textaddress.Text.Trim());
                com.ExecuteNonQuery();
                GridViewRow gr = GridView1.SelectedRow;
                gr.Cells[1].Text = Textusername.Text;
                gr.Cells[2].Text = Textclass.Text;
                gr.Cells[3].Text = Textsection.Text;
                gr.Cells[4].Text = Textaddress.Text;

            }
            else
            {
                SqlCommand com = new SqlCommand("StoredProcedure1", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
                com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
                com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
                com.Parameters.AddWithValue("@address", Textaddress.Text.Trim());
                com.ExecuteNonQuery();
                Response.Redirect("studententry.aspx");
            }
        }

所選行未在 gridview 中選擇。 我可以知道如何啟用 gridview 行。 我使用了 msdn 和其他文件，我也跟着做了，但沒有任何幫助。

我設計我設置了啟用選擇，但我仍然沒有發現問題。

誰能幫我？

謝謝，

Answer 1

基本上，我們在一些 GridviewRow 操作事件（如OnSelectedIndexChanged 、 OnSelectedIndexChanging 、 OnRowEditing或來自模板控件（如Button單擊））上獲得 GridView 的 SelectedRow。 但是在您的編碼中，我認為您的btnsub_Click Gridview 內，因此如果您想在 GridviewRow Action 事件之后使用 SelectedGridViewRow，則將索引保存在某個臨時變量中或將該變量作為參數傳遞給方法。

protected void GridView1_SelectedIndexChanged(Object sender, EventArgs e)
  {
    int index = Gridview1.SelectedIndex;
    hiddenfield.Value = index.ToString();
  }

或在 OnRowEditing 中，您也可以獲得行的索引

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "EditRow")
            {
                GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;
                int index = gr.RowIndex;
                hidval.Value = index.ToString();
            }
        }

並在按鈕上單擊您可以獲得隱藏字段值作為索引：

protected void btnsub_Click(object sender, EventArgs e)
        {
            SqlConnection con = Connection.DBconnection();
            if (Textid.Text.Trim().Length > 0)
            {
                SqlCommand com = new SqlCommand("StoredProcedure3", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@id", Textid.Text.Trim());
                com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
                com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
                com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
                com.Parameters.AddWithValue("@address", Textaddress.Text.Trim());
                com.ExecuteNonQuery();
                if(!String.IsNullOrEmpty(hiddenfield.Value))
                {
                int index = Convert.ToInt16(hiddenfield.Value);
                GridView1.Rows[index].Cells[1].Text = Textusername.Text;
                GridView1.Rows[index].Cells[2].Text = Textclass.Text;
                GridView1.Rows[index].Cells[3].Text = Textsection.Text;
                GridView1.Rows[index].Cells[4].Text = Textaddress.Text;
                }

            }
            else
            {
                SqlCommand com = new SqlCommand("StoredProcedure1", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Name", Textusername.Text.Trim());
                com.Parameters.AddWithValue("@Class", Textclass.Text.Trim());
                com.Parameters.AddWithValue("@Section", Textsection.Text.Trim());
                com.Parameters.AddWithValue("@address", Textaddress.Text.Trim());
                com.ExecuteNonQuery();
                Response.Redirect("studententry.aspx");
            }
        }