Question

我的数据列表中包含_File列，其中包含要下载的文件名

我想隐藏那些链接断开的记录（dos没有文件位于blabla位置）

我尝试使用此

public bool RemoteFileExists(string url)
{
    try
    {
        //Creating the HttpWebRequest
        System.Net.HttpWebRequest request = System.Net.WebRequest.Create(url) as System.Net.HttpWebRequest;
        //Setting the Request method HEAD, you can also use GET too.
        request.Method = "HEAD";
        //Getting the Web Response.
        System.Net.HttpWebResponse response = request.GetResponse() as System.Net.HttpWebResponse;
        //Returns TRUE if the Status code == 200
        return (response.StatusCode == System.Net.HttpStatusCode.OK);
    }
    catch
    {
        //Any exception will returns false.
        return false;
    }
}

ASPX

<% if (RemoteFileExists("www.*****/" + Eval("_File").ToString() + ".pdf"))
                       { 
                    %>
                    <tr>

                        <td style="background-color: white; border-bottom: 1px solid #dbdbdb" width="700">
                            <div style="font-size: 16px; width: 600px; margin-top: 2px; display: block; float: left; color: black;"><%# Eval("Title") %></div>
                            <div style="font-size: 11px; width: 600px; display: block; float: left; margin-top: -3px; color: gray;"><%# Eval("Department") %>, <%# Eval("Program") %>, <%# Eval("Semester") %></div>
                            <a style="float: right; font-size: 12px; padding-left: 18px; padding-right: 5px; margin-right: -4px; margin-top: 0px" target="_blank" class="downloadIcon" href='<%# "1913/" + Eval("_File") + ".pdf" %>'>Download</a></td>

                    </tr>
                    <%
                        }

                    %>

我收到此错误==数据绑定方法（如Eval（），XPath（）和Bind（）只能在数据绑定控件的上下文中使用

我得到的解决方案基本上url文字错误，也需要输入http：//。

<div runat="server" visible=<%# RemoteFileExists("http://www.***/" + Eval("_File").ToString() + ".pdf") %>>
                    <tr>

                        <td style="background-color: white; border-bottom: 1px solid #dbdbdb" width="700">
                            <div style="font-size: 16px; width: 600px; margin-top: 2px; display: block; float: left; color: black;"><%# Eval("Title") %></div>
                            <div style="font-size: 11px; width: 600px; display: block; float: left; margin-top: -3px; color: gray;"><%# Eval("Department") %>, <%# Eval("Program") %>, <%# Eval("Semester") %></div>
                            <a style="float: right; font-size: 12px; padding-left: 18px; padding-right: 5px; margin-right: -4px; margin-top: 0px" target="_blank" class="downloadIcon" href='<%# "1913/" + Eval("_File") + ".pdf" %>'>Download</a></td>

                    </tr>
                        </div>

检查datalist中的断开链接

0 个答案: