执行 response.appendheader content-disposition 后更改后面的代码丢失答案

【问题标题】：code behind changes are lost after executing response.appendheader content-disposition执行 response.appendheader content-disposition 后更改后面的代码丢失
【发布时间】：2017-04-11 23:25:20
【问题描述】：

在 asp:LinkButton 点击事件中执行 response.appendheader content-disposition 后，更改背后的代码会丢失。

我有一个 asp:LinkButton，当用户点击时，附件将被下载，我还需要知道链接是否被点击。出于测试目的，我放置了一个文本框并在 asp:LinkButton 单击事件上更改了它的文本。 但文本框文本仍然是旧文本并且文件正在正确下载。

<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>

这里是代码

 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

【问题讨论】：

标签： asp.net

【解决方案1】：

我只需要知道用户是否点击了链接按钮。我只是在链接按钮客户端单击上添加了一个 javascript 函数来更新隐藏字段的值。

这里是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

【讨论】：