vb.net - 扩展名为 .msg 的文件无法下载

Question

我有以下代码:

Dim filePath As String = Request.QueryString("FilePath")
    Dim fileName As String = filePath.Substring(filePath.LastIndexOf("/") + 1)
    Dim ext As String = Path.GetExtension(fileName)
    'If (ext = ".xls") Then
    '    Response.ContentType = "application/vnd.ms-excel"
    'ElseIf (ext = ".xlsx") Then
    '    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    'End If
    If ext = ".msg" Then
        Response.ContentType = "application/octet-stream"
        'Response.ContentType = "application/vnd.ms-outlook"
    ElseIf (ext = ".xls") Then
        Response.ContentType = "application/vnd.ms-excel"
    ElseIf (ext = ".xlsx") Then
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    End If
    'fileName = Server.MapPath("~\\files\\RAP_Batch_Upload_form.xls")
    Response.AppendHeader("Content-Disposition", "attachment;filename=" & fileName)
    'Response.AddHeader("Content-Length", New System.IO.FileInfo(fileName).Length)
    'Response.AddHeader("Content-Length", New System.IO.FileInfo("Batch_test_11.xlsx").Length)
    Response.Redirect(filePath)
    Response.End()

我可以下载包含 .xls 和 .xlsx 文件的文件，但 .msg 文件将给出页面未找到错误。这些文件存储在 Attachments 文件夹中，示例文件路径类似于 http://our.domain.com/Attachment/2017123456 Demo_Re.msg(空格是文件名的一部分，对于 .xls 和 .xlsx 文件来说这不是问题)。

谁能告诉我我错过了什么。

Answer 1

打开 IIS，选择网站属性

选择 HTTP header -> 单击 MIME 类型 -> 单击新建并添加“.msg”作为扩展名和“application/vsd.ms-outlook”作为 MIME 类型。