如何从asp.net中的label.text调用函数背后的代码 [英] How to call code behind function from label.text in asp.net

问题描述

我正在尝试从Label.Text后面调用用代码定义的函数，但是它不起作用。这是代码... .aspx文件中的
代码

I am trying to call a function defined in code behind from Label.Text but it's not working. Here is the code... code in .aspx file

<asp:Label runat="server" Text='<%# GetPagingCaptionString() %>' ID="pagenumberLabel"></asp:Label>

后面的代码块

public string GetPagingCaptionString()
        {
            int currentPageNumber = Convert.ToInt32(txtHidden.Value);
            int searchOrderIndex;
            if (int.TryParse(Convert.ToString(Session["searchOrderIndex"]), out searchOrderIndex))
            {
                return string.Format("{0} to {1} orders out of {2}", (currentPageNumber * 20) + 1,
                    (currentPageNumber + 1) + 20, GetItemsCount(searchOrderIndex.ToString()));
            }
            return String.Empty;
        }

有人可以告诉我这是怎么回事。

Can anyone tell me what's wrong here.

推荐答案

除非您使用的是基于模板的控件（例如< asp：Repeater> 或< asp：GridView> ），则不能使用服务器端控件中的内联代码块。

Unless you're using a template based control (such as <asp:Repeater> or <asp:GridView>) then you can't use inline code-blocks such as you have within a server-side control.

换句话说，服务器端控件的属性（例如<$ c $）中不能有<％=％> 块c>< asp：Label> ）。该代码将不会运行，您会发现该代码实际上是作为呈现的HTML的一部分发送的。数据绑定控件例外，其中允许<％＃％> 代码块 。

In other words, you can't have <%=%> blocks within the attributes of server-side controls (such as <asp:Label>). The code will not be run and you will find the code is actually sent as part of the rendered HTML. The exception is for databinding controls where <%#%> code-blocks are allowed.

在这种情况下，最好在自己的代码后面设置 .Text 属性。

You're better off in this situation setting the .Text property in the code-behind itself.

例如在页面加载功能中。...

For instance in your page-load function....

protected void Page_Load(object sender, EventArgs e)
{
  if (!Page.IsPostBack)
  {
    pagenumberLabel.Text = GetPagingCaptionString();
  }
}

这篇关于如何从asp.net中的label.text调用函数背后的代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！