如何在gridview中的編輯按鈕時選擇行

Question

我已經創建了具有編輯、更新和刪除功能的 gridview。

當我選擇鏈接時，將選擇特定行。 但是當我點擊編輯按鈕時，選定的行沒有選擇。

我可以知道，我該如何解決這個問題？

這是我的cs文件：

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 = Textid.Text;
                gr.Cells[2].Text = Textusername.Text;
                gr.Cells[3].Text = Textclass.Text;
                gr.Cells[4].Text = Textsection.Text;
                gr.Cells[5].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");
            }
        }
        protected void btnrst_Click(object sender, EventArgs e)
        {

            Textusername.Text = null;
            Textclass.Text = null;
            Textsection.Text = null;
            Textaddress.Text = null;

        }
        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            SqlConnection con = Connection.DBconnection();
            if (e.CommandName == "EditRow")
            {
                GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;               
                Textid.Text = gr.Cells[1].Text;
                Textusername.Text = gr.Cells[2].Text;
                Textclass.Text = gr.Cells[3].Text;
                Textsection.Text = gr.Cells[4].Text;
                Textaddress.Text = gr.Cells[5].Text;
            }
            else if (e.CommandName == "Deleterow")
            {
                GridViewRow gr = (GridViewRow)((Button)e.CommandSource).NamingContainer;      
                SqlCommand com = new SqlCommand("StoredProcedure4", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@ID", gr.Cells[0].Text);
                var id = Int32.Parse(e.CommandArgument.ToString());                
                GridView1.Rows[id].Visible = false;
                com.ExecuteNonQuery();

            }
        }

這是我的aspx：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" DataSourceID="SqlDataSource1" 
        OnRowCommand="GridView1_RowCommand" AutoGenerateSelectButton="True" 
        EnablePersistedSelection="True" BackColor="White">
        <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>
                <ControlStyle BorderColor="#CCFF66" />
          </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>
        <SelectedRowStyle BackColor="#FF66FF" />
    </asp:GridView>

我檢查了設計，我確定啟用 selectedrowbutton 是真的。 當我單擊編輯按鈕時，在放置斷點后它顯示空值，這意味着所選行不起作用。 這是我的輸出截圖

誰能幫我解決這個問題？

謝謝，

Answer 1

您可以按照以下三種方法在按鈕單擊時突出顯示當前行。

方法一：

在 gridview 標記和代碼隱藏中添加OnSelectedIndexChanged事件。

GridView 控件標記

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" DataSourceID="SqlDataSource1" 
        OnRowCommand="GridView1_RowCommand" AutoGenerateSelectButton="True" 
        EnablePersistedSelection="True" BackColor="White"
        OnSelectedIndexChanged = "OnSelectedIndexChanged"
        EnableViewState="true">
</asp:GridView>

代碼隱藏

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        if (row.RowIndex == GridView1.SelectedIndex)
        {
            row.BackColor = ColorTranslator.FromHtml("#A1DCF2");
        }
        else
        {
            row.BackColor = ColorTranslator.FromHtml("#FFFFFF");
        }
    }
}

但在這里，您將在 gridview 中循環，直到獲得選定的行索引。 這會降低性能。

方法二：

下面的方法比以前的方法要好得多。 在這里，您將不需要循環，只需在按鈕單擊事件下提及以下內容即可完成。 我沒有在 IDE 中測試過這個，不能保證它成功。

Button btnEdit = Button as sender;
GridViewRow gvr = (GridViewRow)btnEdit.NamingContainer;
int rowindex = gvr.RowIndex;
if (rowindex == GridView1.SelectedIndex)
{
    gvr.BackColor = ColorTranslator.FromHtml("#A1DCF2");
}
else
{
    gvr.BackColor = ColorTranslator.FromHtml("#FFFFFF");
}

方法三：

由於您使用的是 RowCommand，因此您可以應用以下內容：-

int rowindex = Convert.ToInt32(e.CommandArgument);
GridViewRow gvr = GridView1.Rows(rowindex);
if (rowindex == GridView1.SelectedIndex)
{
    gvr.BackColor = ColorTranslator.FromHtml("#A1DCF2");
}
else
{
    gvr.BackColor = ColorTranslator.FromHtml("#FFFFFF");
}