如何在复选框OnCheckedChanged时从gridview获取复选框值

Question

我想在gridview中检查时更新数据。在我从复选框获取值之前，我的代码只返回数据库中的数据。我检查后想要当前值。

代码隐藏： -

protected void chkSelected_CheckedChanged(object sender, EventArgs e)
{
    for (int rowIndex = 0; rowIndex < GridView1.Rows.Count; rowIndex++)
    {
        if (Convert.ToString(GridView1.Rows[rowIndex].Cells[4].Text) != "")
        {
            Response.Write("true");
        }
        else
        {
            Response.Write("fasle");
        }
    }
}

设计代码： -

<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1"
              CellPadding="4" GridLines="None" ForeColor="#333333" Font-Size="Smaller" 
              AutoGenerateColumns="False">
    <RowStyle BackColor="#EFF3FB" />
    <Columns>
        <asp:BoundField DataField="LevelID" HeaderText="ลำดับข้อ" ReadOnly="True" 
                        ItemStyle-Width="50"  >
        </asp:BoundField>
        <asp:BoundField DataField="LevelDesc" HeaderText="คำถาม" ReadOnly="True" 
                        ItemStyle-Width="250"  >
        </asp:BoundField>
        <asp:BoundField DataField="ChoiceID" HeaderText="ข้อย่อย" ReadOnly="True" 
                        ItemStyle-Width="50"  >
        </asp:BoundField>
        <asp:BoundField DataField="ChoiceDesc" HeaderText="คำถามย่อย" ReadOnly="True" 
                        ItemStyle-Width="400"  >
        </asp:BoundField>
        <asp:TemplateField HeaderText="ใช่">          
            <ItemTemplate>              
                <asp:CheckBox ID="chkSelected" runat="server" Checked='<%# Eval("Selected").ToString().Equals("True") %>'
                     AutoPostBack="true" OnCheckedChanged="chkSelected_CheckedChanged" CssClass="chkBox" />          
            </ItemTemplate>       
        </asp:TemplateField> 
    </Columns>
    <FooterStyle BackColor="#507CD1" ForeColor="White" Font-Bold="True" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <HeaderStyle BackColor="#0000CD" Font-Bold="True" ForeColor="White" />
    <EditRowStyle BackColor="#2461BF" />
    <AlternatingRowStyle BackColor="White" />
</asp:GridView>

Answer 1

使用GridViewRow如下...您可以获取使用NamingContainer属性检查的复选框的当前行，如下所示...

修改： - 更改标记并添加Hiddenfield以保持Selected的值，如下所示...

<asp:TemplateField HeaderText="ใช่">          
            <ItemTemplate>              
                <asp:CheckBox ID="chkSelected" runat="server"  Checked='<%# Eval("Selected").ToString().Equals("True") %>'
                     AutoPostBack="true" OnCheckedChanged="chkSelected_CheckedChanged" CssClass="chkBox" />     
                <asp:HiddenField ID="hiddenField1" Value='<%# Eval("Selected").ToString() %>' runat="server" />    
            </ItemTemplate>       
 </asp:TemplateField> 

然后你可以得到Hiddenfield如下，它的值也是

protected void chkSelected_CheckedChanged(object sender, EventArgs e)
    {
         GridViewRow row = (GridViewRow)(((CheckBox)sender).NamingContainer);
         HiddenField hdnCheck=(HiddenField)row.Cells[4].FindControl("hiddenField1");
         if (Convert.ToString(hdnCheck.Value != "")
           {
               Response.Write("true");
           }
           else
           {
               Response.Write("false");
           }

         // Edit: You can easily get Checkbox which has been checked, and do your logic
         CheckBox chkSelect=(CheckBox)sender;
         if (chkSelect.Checked)
           {
               Response.Write("true");
           }
           else
           {
               Response.Write("false");
           }    
    }