c# - 文件下载奇怪的问题

Question

我在数据库中保存了文档文件/pdf文件或txt文件。现在要获取该文件，我正在使用下面的代码。

JobApplicantResume oApplicantResumne = new JobApplicantResume();
DataSet dsApplicantResume = oApplicantResumne.GetJobApplicantResumeByJobApplicantResumeId(1552);//1552 Long value
Response.ClearContent();
Response.ClearHeaders();
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/xx-xxxx";
Response.AddHeader("Content-Disposition", "attachment;filename=" + dsApplicantResume.Tables[0].Rows[0]["sFileName"].ToString());
//Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
Byte[] bytes = (Byte[])dsApplicantResume.Tables[0].Rows[0]["binFile"];
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();

它给出了确切的文件。打开文件没有问题。

在其他一些页面中我使用了相同的代码:

JobApplicantResume oApplicantResumne = new JobApplicantResume();
DataSet dsApplicantResume = oApplicantResumne.GetJobApplicantResumeByJobApplicantResumeId(1552);//1552 Long value
Response.ClearContent();
Response.ClearHeaders();
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/xx-xxxx";
Response.AddHeader("Content-Disposition", "attachment;filename=" + dsApplicantResume.Tables[0].Rows[0]["sFileName"].ToString());
//Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
Byte[] bytes = (Byte[])dsApplicantResume.Tables[0].Rows[0]["binFile"];
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();

它还提供了一个文件供下载。但是当我打开它时，数据以某种不同的格式出现。

喜欢:

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垃圾数据。我不明白为什么会出现问题。如果有人遇到这种类似的问题或任何建议/帮助将对克服这个问题非常有帮助。

非常感谢您的关注。

Answer 1

尝试添加 Unicode Byte-Order-Mark full example .

    //add the BOM
    byte[] bBOM = new byte[] { 0xEF, 0xBB, 0xBF };
    byte[] bContent = ms.ToArray();
    byte[] bToWrite = new byte[bBOM.Length + bContent.Length];

    //combile the BOM and the content
    bBOM.CopyTo( bToWrite, 0 );
    bContent.CopyTo( bToWrite, bBOM.Length );

    //write to the client
    HttpContext.Current.Response.Write( Encoding.UTF8.GetString( bToWrite ) );
    HttpContext.Current.Response.Flush();
    HttpContext.Current.Response.End();