无法将类型 System.Web.UI.WebControls.Label 的对象转换为类型 System.IConvertible

Question

这是网格视图代码

<asp:GridView ID="gvwSearch" runat="server" 
    AutoGenerateColumns="False" 
    BackColor="White"
    BorderColor="#999999" 
    BorderStyle="Solid" 
    BorderWidth="1px" 
    CellPadding="3" 
    DataSourceID="SearchSqlDataSource"
    ForeColor="Black" 
    GridLines="Vertical" 
    Width="100%" 
    Visible="False" 
    AllowSorting="True"
    AllowPaging="True" 
    OnSelectedIndexChanged="gvwSearch_SelectedIndexChanged" 
    OnPageIndexChanging="gvwSearch_PageIndexChanging">
    <AlternatingRowStyle BackColor="#CCCCCC" />
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="lnkbtnEdit" runat="server" OnClick="lnkbtnEdit_Click">
                    Edit</asp:LinkButton>
                &nbsp;|
                    <asp:LinkButton ID="nkbtnView" runat="server" OnClick="nkbtnView_Click">
                        View</asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Employee Code" SortExpression="Employee Code">
            <EditItemTemplate>
                <asp:TextBox ID="TextBox1" DataField="EmployeeCode" runat="server" 
                    Text='<%# Bind("[Employee Code]") %>'>
                </asp:TextBox>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblCode" DataField="EmployeeCode" runat="server" 
                    Text='<%# Bind("[Employee Code]") %>'>

                </asp:Label>
            </ItemTemplate>
        </asp:TemplateField>

        <asp:BoundField DataField="Full Name" HeaderText="Full Name" SortExpression="Full Name" />
        <asp:BoundField DataField="CPR" HeaderText="CPR" SortExpression="CPR" />
        <asp:BoundField DataField="Department" HeaderText="Department" SortExpression="Department" />
        <asp:BoundField DataField="Designation" HeaderText="Designation" SortExpression="Designation" />
        <asp:BoundField DataField="Nationality" HeaderText="Nationality" SortExpression="Nationality" />
        <asp:BoundField DataField="Grade" HeaderText="Grade" SortExpression="Grade" />
        <asp:BoundField DataField="Joining Date" HeaderText="Joining Date" SortExpression="Joining Date" />
        <asp:BoundField DataField="Local Phone" HeaderText="Local Phone" SortExpression="Local Phone" />
        <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status" />
        <asp:BoundField DataField="End of Service" HeaderText="End of Service" ReadOnly="True"
            SortExpression="End of Service" />
    </Columns>
    <FooterStyle BackColor="#CCCCCC" />
    <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
    <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
    <SortedAscendingCellStyle BackColor="#F1F1F1" />
    <SortedAscendingHeaderStyle BackColor="Gray" />
    <SortedDescendingCellStyle BackColor="#CAC9C9" />
    <SortedDescendingHeaderStyle BackColor="#383838" />
    <SortedAscendingCellStyle BackColor="#F1F1F1" />
    <SortedAscendingHeaderStyle BackColor="Gray" />
    <SortedDescendingCellStyle BackColor="#CAC9C9" />
    <SortedDescendingHeaderStyle BackColor="#383838" />
</asp:GridView>

这是我的 C# 代码：

protected void lnkbtnEdit_Click(object sender, EventArgs e)
{
    GridViewRow gridViewRow = (GridViewRow)(sender as Control).Parent.Parent;
    int index = gridViewRow.RowIndex;

    Label Code_Label = (Label)(gvwSearch.Rows[index].FindControl("lblCode"));

    int CodeLabel = Convert.ToInt32(Code_Label);//At thiline error occurs.
    New_Employee Selected_Employee = new New_Employee(CodeLabel);
    Session["Selected_Employee"] = Selected_Employee;
    Response.Redirect("~/Forms/New_Employee/Employees/Edit_Employee.aspx");
}

是的，我试过改变这条线

int CodeLabel =Convert.ToInt32(Code_Label);

至

int CodeLabel =Convert.ToInt32(Code_Label.Text);

这消除了错误，但没有员工数据从该页面传送到 Edit_Employee.aspx 当在 GridView 中单击 Edit 按钮时任何帮助，将不胜感激。提前致谢。

Answer 1

我知道您想将用户重定向到“使用员工代码编辑员工”页面。我建议你使用 Anchor 标签而不是 LinkButton。试试下面的代码，它很容易集成，它可以防止服务器请求和响应。

您的编辑 Link 按钮：

<asp:LinkButton ID="lnkbtnEdit" runat="server" OnClick="lnkbtnEdit_Click">
                Edit</asp:LinkButton>

替换为：

<a href='<%# "Forms/New_Employee/Employees/Edit_Employee.aspx?Selected_Employee=" + Eval("[Employee Code]") %>'>Edit</a>

我在这里所做的，我在查询字符串而不是会话中传递了员工代码，您可以使用以下代码在 Edit_Employee 页面中检索查询字符串变量：

int liEmployeeCode = Convert.ToInt32(Request.QueryString["Selected_Employee"]);

如果您有任何问题，请告诉我。

无法将类型 System.Web.UI.WebControls.Label 的对象转换为类型 System.IConvertible

Unable to cast object of type System.Web.UI.WebControls.Label to type System.IConvertible

c#

asp.net

gridview