Question

在asp：LinkButton点击事件中执行response.appendheader content-disposition后，

后面的代码会丢失。

我有一个asp：LinkButton，当用户点击然后附加文件将被下载，我也需要知道链接是否被点击。出于测试目的，我在asp：LinkButton点击事件上放了一个文本框并更改了它的文本。 但文本框文本仍为旧文本，文件正在正常下载。

<asp:LinkButton runat="server" ID="LinkAttachmentView" 
                ToolTip="Click here to Download  the Attachment" Font-Bold="True" 
                ForeColor="Red"  >Click here to View  the Attachment
 </asp:LinkButton>

这是代码

 Protected Sub LinkAttachmentView_Click(sender As Object, e As System.EventArgs) Handles LinkAttachmentView.Click

        If HdAttachmentFileName.Value = "" Then
            HdAttachmentClicked.Value = "0"
            Return
        End If
        HdAttachmentClicked.Value = "1"
        TextBox1.Text = "clicked"

        Response.ContentType = ContentType
        Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(HdAttachmentFileName.Value))
        Response.WriteFile(HdAttachmentFileName.Value)

        Response.Flush()

        Response.End()

        HdAttachmentClicked.Value = "1"
        TextBox1.Text = "clicked"

    End Sub

Answer 1

我需要的是知道用户是否点击了链接按钮。我只是在linkbutton客户端上添加了一个javascript函数，单击以更新Hidden字段的值。

这是javascript：

 function SetClickValue() {
        var HdField = document.getElementById("<%=HdAttachmentClicked.ClientID%>");
        HdField.value = "1"; 
    }

HTML：

<asp:LinkButton runat="server" ID="LinkAttachmentView" 
                ToolTip="Click here to Download  the Attachment" Font-Bold="True" 
                ForeColor="Red" onclientclick="SetClickValue()"               
                >Click here to View  the Attachment
                </asp:LinkButton>

点击事件现在只是用于下载附件：

Protected Sub LinkAttachmentView_Click(sender As Object, e As System.EventArgs) Handles LinkAttachmentView.Click

        If HdAttachmentFileName.Value = "" Then
            HdAttachmentClicked.Value = "0"
            Return
        End If


        Response.ContentType = ContentType
        Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(HdAttachmentFileName.Value))
        Response.WriteFile(HdAttachmentFileName.Value)
        Response.Flush() 
        Response.End()
    End Sub

执行response.appendheader content-disposition后，代码隐藏更改将丢失

1 个答案: