Question

我做了一个按钮，用于从数据库中删除文件，要删除文件，您需要选中一个复选框，然后单击一个按钮。为什么当我单击按钮并将复选框值写入html时，它总是显示false ...

ASPX：

<asp:GridView HorizontalAlign="Center" ID="GridView1" runat="server" class="" AutoGenerateColumns="False" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Horizontal" DataKeyNames="ID">
    <Columns>
        <asp:TemplateField HeaderText="Name">< ItemTemplate >
                            < asp:LinkButton ID = "LinkButton2" runat="server" OnClick="OpenDocument" Text='<%# Eval("File_Name") %>'></asp:LinkButton>
                        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Delete?">< ItemTemplate >
                            < asp:CheckBox ID = "CheckBox1" runat="server" />
                        </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<asp:Button runat="server" Text="Update" ID="Update" class="button" OnClick="UpdateTable" Style="font-size: 20px" />

后面的代码：

protected void UpdateTable(object sender, EventArgs e)
{
    foreach (GridViewRow item in GridView1.Rows)
    {
        CheckBox chk = (CheckBox)item.FindControl("CheckBox1");
        if (chk != null)
        {
            //This is being written and always false
            Response.Write(chk.Checked);
            if (chk.Checked)
            {
               //Delete the item. (never being executed)
            }
        }
    }
}

我希望chk.Checked为True，因为我单击了它...

Answer 1

如果要在Page_Load中绑定网格，请确保没有在if（！IsPostBack）{}之外绑定网格。否则，您将失去每个回发中的复选框，从而失去复选框的状态。

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    {
       //Bind Your Grid Here
    }
}

Answer 2

item.Cells [0] .Text将不起作用，因为网格列定义为TemplateField而不是BoundField。因此，我们需要使用FindControl访问该控件并从中检索文本。

protected void UpdateTable(object sender, EventArgs e)
        {
            foreach (GridViewRow item in GridView1.Rows)
            {
                CheckBox chk = (CheckBox)item.FindControl("CheckBox1");
                if (chk != null)
                {
                    //This is being written and always false
                    Response.Write(chk.Checked);
                    if (chk.Checked)
                    {
                        //Delete the item. (never being executed)
                    }
                }
                LinkButton lnk = (LinkButton)item.FindControl("LinkButton2");
                if (lnk != null)
                {
                    Response.Write(lnk.Text);
                }
            }
        }

即使我选中复选框值也始终为空

2 个答案: