在 ASP.NET 的 DATAGRID 中查找 CHECKBOX

Question

我有一个 GRIDVIEW 和几个复选框。

当我选择一个复选框时，我需要运行一些代码。

为了检测它，我对 GRIDVIEW 中包含的 CHECKBOX 使用事件处理程序。

我无法使用错误的代码访问 CHECKBOX。

你知道我做错了什么吗？感谢您的帮助。再见

ASPX

    <asp:Label ID="uxMessageDisplayer" runat="server" Visible="False" EnableViewState="False"></asp:Label>
<asp:GridView ID="uxUserListDisplayer" runat="server" AutoGenerateColumns="False"
    OnRowDataBound="uxUserListDisplayer_RowDataBound">
    <Columns>
        <asp:TemplateField HeaderText="Active">
            <ItemTemplate>
                <asp:CheckBox ID="uxActiveCheckBoxSelector" runat="server" AutoPostBack="true" OnCheckedChanged="uxRoleCheckBoxSelector_CheckChanged" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Users">
            <ItemTemplate>
                <asp:Label runat="server" ID="uxUserNameLabelDisplayer" Text='<%# Container.DataItem %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:LinkButton ID="uxLinkEditButton" runat="server" CausesValidation="False" CommandName="Edit"
                    Text="Edit"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField ShowHeader="False">
            <ItemTemplate>
                <asp:LinkButton ID="uxLinkDeleteButton" runat="server" CausesValidation="False" CommandName="Delete"
                    Text="Delete"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

代码背后

    protected void uxRoleCheckBoxSelector_CheckChanged(object sender, EventArgs e)
    {
         // Reference the CheckBox that raised this event   
        //CheckBox uxActiveCheckBoxSelector = sender as CheckBox;

        CheckBox activeCheckBox = (CheckBox)FindControl("uxActiveCheckBoxSelector");

        if (activeCheckBox.Checked == true)
        {
            uxMessageDisplayer.Text = "T - Aproved User";
            uxMessageDisplayer.Enabled = false;
        }
        else
        {
            uxMessageDisplayer.Text = "F - NOT Aproved User";
            uxMessageDisplayer.Enabled = false;
        }
       }

Answer 1

如果我没有误解您的问题，您正在尝试根据其选中状态将标签文本与 checkbox 设置在同一行。

以下是我在电脑上尝试的代码片段，希望对您有所帮助。

.aspx：

<asp:GridView ID="GridView1" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="CheckBox1_CheckChanged" AutoPostBack="true" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

.cs：

protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack)
        return;

    //create dummy data
    List<string> rows = new List<string>();
    Enumerable.Range(1, 5).ToList().ForEach(x => rows.Add(x.ToString()));

    //bind dummy data to gridview
    GridView1.DataSource = rows;
    GridView1.DataBind();
}

    protected void CheckBox1_CheckChanged(object sender, EventArgs e)
    {
        //cast sender to checkbox
        CheckBox CheckBox1 = (CheckBox)sender;

        //retrieve the row where checkbox is contained
        GridViewRow row = (GridViewRow)CheckBox1.NamingContainer;

        //find the label in the same row
        Label Label1 = (Label)row.FindControl("Label1");

        //logics
        if (CheckBox1 != null)  //make sure checkbox1 is found
        {
            if (CheckBox1.Checked)
            {
                if (Label1 != null) //make sure label1 is found
                {
                    Label1.Text = "Checked";
                }

            }
            else
            {
                if (Label1 != null)
                {
                    Label1.Text = "Unchecked";
                }
            }
        }
    }

Answer 2

我假设事件处理程序实际上已注册到复选框。

CheckBox activeCheckBox = (CheckBox)sender;

什么是“uxActiveCheckBoxSelector”以及为什么您忽略sender？

Answer 3

代码已按照建议更正！
对初学者有用的资源

        protected void uxRoleCheckBoxSelector_CheckChanged(object sender, EventArgs e)
    {
        // Cast sender to CheckBox
        CheckBox activeCheckBox = (CheckBox)sender;

        // Retrieve the row where CheckBox is contained (NamingContainer used to retrive parent control
        GridViewRow row = (GridViewRow)activeCheckBox.NamingContainer;

        if (activeCheckBox.Checked == true)
        {
            uxMessageDisplayer.Text = "T - Aproved User";
        }
        else
        {
            uxMessageDisplayer.Text = "F - NOT Aproved User";
        }
    }