防止代码提示用户保存文件

Question

我在我的报表控制器中使用了下面的方法。它成功地返回了我在数据库中分配给varBinary(MAX)字段的文件内容。我的问题是，当这段代码执行时，它会导致浏览器提示用户保存或打开文件。我想阻止这一切的发生。

如何强制它只将二进制数据返回到调用控制器方法，而不将结果推送到客户端浏览器？

private FileContentResult RenderReportFile(LocalReport localReport, List<ReportDataSource> listDS, string sFilename, string sReportType, bool bLandscape)
{
    string sHeight = "11";
    string sWidth = "8.5";

    if (bLandscape)
    { sWidth = sHeight; sHeight = "8.5"; }

    foreach (ReportDataSource ds in listDS)
    {
        localReport.DataSources.Add(ds);
    }

    HttpContextBase imageDirectoryPath = HttpContext;

    string reportType = sReportType;
    string mimeType;
    string encoding;
    string fileNameExtension;

    //The DeviceInfo settings should be changed based on the reportType
    string deviceInfo =
        "<DeviceInfo>" +
        "  <OutputFormat>" + sReportType + "</OutputFormat>" +
        "  <PageWidth>" + sWidth + "in</PageWidth>" +
        "  <PageHeight>" + sHeight + "in</PageHeight>" +
        "  <MarginTop>0.5in</MarginTop>" +
        "  <MarginLeft>0.5in</MarginLeft>" +
        "  <MarginRight>0.5in</MarginRight>" +
        "  <MarginBottom>0.5in</MarginBottom>" +
        "</DeviceInfo>";

    Warning[] warnings;
    string[] streams;
    byte[] renderedBytes;

    //Render
    renderedBytes = localReport.Render(
        reportType,
        deviceInfo,
        out mimeType,
        out encoding,
        out fileNameExtension,
        out streams,
        out warnings);


    //Write to the outputstream
    //Set content-disposition to "attachment" so that user is prompted to take an action
    //on the file (open or save)

    Response.Clear();
    Response.ContentType = mimeType;
    Response.AddHeader("content-disposition", "attachment; filename=" + sFilename + "." + fileNameExtension);
    Response.BinaryWrite(renderedBytes);
    Response.End();
    return File(renderedBytes, "application/pdf", sFilename + "." + fileNameExtension);
}

Answer 1

此代码负责将文档发送到客户端：

Response.Clear();
Response.ContentType = mimeType;
Response.AddHeader("content-disposition", "attachment; filename=" + sFilename + "." + fileNameExtension);
Response.BinaryWrite(renderedBytes);
Response.End();

删除它，用户将不会被提示保存或打开。