Question

我正在我的项目中创建一个pdf文件.Pdf生成工作正常。创建后，它会打开浏览器但是当我点击保存链接时，它会提示保存整个页面而不是pdf文件。可以任何一个人帮我吗？这是我的代码：

  protected void btn_ViewSlip_Click(object sender, EventArgs e)
        {
            dt_Payslip = mm_salary.GetPayslipData(DDL_Year.SelectedValue.ToString(), DDL_Month.SelectedValue.ToString(), Session["empcd"].ToString());
            if (dt_Payslip.Rows.Count > 0)
            {
                dt_CurrPay = emp_coprofile.GetCurrExp(Session["empcd"].ToString(), DDL_Month.SelectedValue.ToString(), DDL_Year.SelectedValue.ToString());
                GenerateDisclaimerPDF();//pdf is generating here
                string url = FilesPath.Path_SaveFile + Session["empcd"].ToString() + " - Payslip.pdf";
                System.IO.FileInfo file = new System.IO.FileInfo(url);
                if (file.Exists)
                {
                    WebClient client = new WebClient();
                    Byte[] buffer = client.DownloadData(url);
                    Response.ContentType = "application/pdf";
                    Response.AddHeader("content-length", buffer.Length.ToString());
                    Response.BinaryWrite(buffer);
                }
            }
            else
            {
                msg = "Pay slip for "+DDL_Month.SelectedValue.ToString()+"-"+DDL_Year.SelectedValue+" does not exist";
            }
        }

输出：

Answer 1

那是因为你正在设置

Response.ContentType = "application/pdf";

告诉Chrome这个文件是PDF，然后用PDFjs打开它，当你点击保存时，它想要保存PDFjs-Viewer网页而不是PDF。

如果单击下载图标，则可以下载PDF。
您需要设置content-disposition＆＃34; attachment＆＃34;，您需要将mime-type设置为application / octet-stream。然后它适用于Chrome（以及IE和Firefox）。

如果您想在IE中的查看器中显示PDF，就像在Chrome中一样，那么您需要设置内联内容（IE忽略mime类型并转而使用文件扩展名）。

Dim baPDF As Byte() = GetPdfFromImage(Me.Data)

context.Response.Clear()
'context.Response.AddHeader("Content-Disposition", "attachment; filename=" + strFileName)
context.Response.AddHeader("Content-Disposition", Portal.ASP.NET.GetContentDisposition("Drucken.pdf", "inline"))
context.Response.AddHeader("Content-Length", baPDF.Length.ToString())
' context.Response.ContentType = "application/msword"
' context.Response.ContentType = "application/octet-stream"

' http://superuser.com/questions/219870/how-to-open-pdf-in-chromes-integrated-viewer-without-downloading-it#
' context.Response.ContentType = "text/html"
context.Response.ContentType = "application/pdf"

另外，请注意文件名中是否包含UTF-8字符，需要正确设置文件名标题（不同版本[IE]中不同浏览器的值不同）。

Public Shared Function GetContentDisposition(ByVal strFileName As String) As String
    Return GetContentDisposition(strFileName, "attachment")
End Function ' GetContentDisposition '


' http://www.iana.org/assignments/cont-disp/cont-disp.xhtml '
Public Shared Function GetContentDisposition(ByVal strFileName As String, ByVal strDisposition As String) As String
    ' http://stackoverflow.com/questions/93551/how-to-encode-the-filename-parameter-of-content-disposition-header-in-http '
    Dim contentDisposition As String
    strFileName = StripInvalidPathChars(strFileName)

    If String.IsNullOrEmpty(strDisposition) Then
        strDisposition = "inline"
    End If

    If System.Web.HttpContext.Current IsNot Nothing AndAlso System.Web.HttpContext.Current.Request.Browser IsNot Nothing Then
        If (System.Web.HttpContext.Current.Request.Browser.Browser = "IE" And (System.Web.HttpContext.Current.Request.Browser.Version = "7.0" Or System.Web.HttpContext.Current.Request.Browser.Version = "8.0")) Then
            contentDisposition = strDisposition + "; filename=" + Uri.EscapeDataString(strFileName).Replace("'", Uri.HexEscape("'"c))
        ElseIf (System.Web.HttpContext.Current.Request.Browser.Browser = "Safari") Then
            contentDisposition = strDisposition + "; filename=" + strFileName
        Else
            contentDisposition = strDisposition + "; filename*=UTF-8''" + Uri.EscapeDataString(strFileName)
        End If
    Else
        contentDisposition = strDisposition + "; filename*=UTF-8''" + Uri.EscapeDataString(strFileName)
    End If

    Return contentDisposition
End Function ' GetContentDisposition '

此外，如果您愿意接受好建议，请摆脱

Session["empcd"]

您正在为NullReferenceExceptions设置自己，而且完全没有必要......
如果可以避免，请尽量不要使用会话。

哦，顺便说一下：

您应该在WebClient中添加using子句;否则你没有妥善处理资源。

using(WebClient client = new WebClient())
{
       // Your code goes here
} // End Using

这将比client.dispose（）具有额外的好处，你不需要将它放入try-cach if-not-null-dispose以确保之后释放资源。

Answer 2

我将代码修改为：

 protected void btn_ViewSlip_Click(object sender, EventArgs e)
    {
        dt_Payslip = mm_salary.GetPayslipData(DDL_Year.SelectedValue.ToString(), DDL_Month.SelectedValue.ToString(), Session["empcd"].ToString());
        if (dt_Payslip.Rows.Count > 0)
        {
            dt_CurrPay = emp_coprofile.GetCurrExp(Session["empcd"].ToString(), DDL_Month.SelectedValue.ToString(), DDL_Year.SelectedValue.ToString());
            GenerateDisclaimerPDF();
            string url = FilesPath.Path_SaveFile + Session["empcd"].ToString() + " - Payslip.pdf";
            System.IO.FileInfo file = new System.IO.FileInfo(url);
            if (file.Exists)
            {
                //WebClient client = new WebClient();
                //Byte[] buffer = client.DownloadData(url);
                //Response.ContentType = "application/pdf";
                //Response.AddHeader("content-length", buffer.Length.ToString());
                //Response.BinaryWrite(buffer);
               // Response.Clear();
                WebClient client = new WebClient();
                Byte[] buffer = client.DownloadData(url);
                Response.AddHeader("content-disposition", "attachment; filename=" + Session["empcd"].ToString() + " - Payslip.pdf");
                Response.AddHeader("content-length", buffer.Length.ToString());  
                Response.ContentType = "application/pdf";
                Response.BinaryWrite(buffer);
            }
        }
        else
        {
            msg = "Pay slip for "+DDL_Month.SelectedValue.ToString()+"-"+DDL_Year.SelectedValue+" does not exist";
        }
    }

创建后不保存的pdf文件

2 个答案: