Question

C＃

protected void imgbtn5_Click(object sender, EventArgs e)
{
    Session["theme"] = lbl5.Text;
    foreach (ListViewItem item in theme5.Items)
    {
        Label country = (Label)item.FindControl("lblcountry");
        Session["country"] = country.ToString();        
        Label price = (Label)item.FindControl("lblprice");
        Session["price"] = price.ToString();         
    }       
}

这里因为foreach会话值再次变为null。请提出其他建议。

ASPX

<asp:ListView ID="theme5" runat="server" DataSourceID="SqlDataSource5">
<ItemTemplate>
<asp:Label ID="lblcountry" runat="server" Text='<%#Eval("Country") %>' />
</ItemTemplate>
</asp:ListView>

在这里，我想获取标签文本值并将其传输到会话中。我猜有问题：

Label country = (Label)theme5.FindControl("lblcountry");

在国家/地区，我在dubugging时找到空值。

Answer 1

您正在添加标签而非标签文字

protected void imgbtn5_Click(object sender, EventArgs e)
{
    Session["theme"] = lbl5.Text;
    foreach (ListViewItem item in theme5.Items)
    {
        Label country = (Label)item.FindControl("lblcountry");
// here insted of country.ToString() you Should use 
        Session["country"] = country.Text.ToString();        
        Label price = (Label)item.FindControl("lblprice");
        Session["price"] = price.Text.ToString();         
    }       
}

Answer 2

您可以尝试使用此代码

var index = ...;

var result = (label)theme5.Items[index].FindControl("lblcountry");

您可以根据Itemcommand

使用此代码

<asp:ListView ID="theme5" runat="server" DataSourceID="SqlDataSource5">
    <ItemTemplate>
    <asp:Button ID="btn"
    Text="..."
    CommandName="YourCommand"
    CommandArgument='<%# Container.DataItemIndex %>'
    runat="server"   ItemCommand="Test_ItemCommand" />
    </ItemTemplate>
</asp:ListView>



protected void Test_ItemCommand(object sender, ListViewCommandEventArgs e)
{

 if (e.CommandName.Equals("YourCommand"))
 {
      var result = (label)theme5.Items[Convert.ToInt32(e.CommandArgument)].FindControl("lblcountry"); 
 }

}

Answer 3

我认为您需要访问当前所选的theme5项目并获取该项目中的标签：

Label lblcountry = 
  (Label)theme5.Items[theme5.SelectedIndex].FindControl("lblcountry");

从C＃中的Listview标签获取Label文本值

3 个答案: