Zip文件越來越損壞

request = MakeConnection(uri, WebRequestMethods.Ftp.DownloadFile, username, password); 
response = (FtpWebResponse)request.GetResponse(); 
Stream responseStream = response.GetResponseStream(); 

//This part of the code is used to write the read content from the server 
using (StreamReader responseReader = new StreamReader(responseStream)) 
{ 
    using (var destinationStream = new FileStream(toFilenameToWrite, FileMode.Create)) 
    { 
     byte[] fileContents = Encoding.UTF8.GetBytes(responseReader.ReadToEnd()); 
     destinationStream.Write(fileContents, 0, fileContents.Length); 
    } 
}

//This part of the code is used to write the read content from the server 
using (var destinationStream = new FileStream(toFilenameToWrite, FileMode.Create)) 
{ 
    long length = response.ContentLength; 
    int bufferSize = 2048; 
    int readCount; 
    byte[] buffer = new byte[2048]; 
    readCount = responseStream.Read(buffer, 0, bufferSize); 
    while (readCount > 0) 
    { 
     destinationStream.Write(buffer, 0, readCount); 
     readCount = responseStream.Read(buffer, 0, bufferSize); 
    } 
}

前者的人將內容寫入到文件，但是當我嘗試打開它說，它已損壞的文件。但後來的人在下載zip文件時完成這項工作。是否有任何特定的原因，爲什麼前代碼不適用於zip文件，因爲它適用於文本文件？Zip文件越來越損壞

來源

2016-12-28 Prabu

的StreamReader是一個TextReader的。看[這個答案]（http://stackoverflow.com/a/4769070/60761）。 –

使用BinaryWriter並將其傳遞給FileStream。

//This part of the code is used to write the read content from the server 
    using (var destinationStream = new BinaryWriter(new FileStream(toFilenameToWrite, FileMode.Create))) 
    { 
     long length = response.ContentLength; 
     int bufferSize = 2048; 
     int readCount; 
     byte[] buffer = new byte[2048]; 
     readCount = responseStream.Read(buffer, 0, bufferSize); 
     while (readCount > 0) 
     { 
      destinationStream.Write(buffer, 0, readCount); 
      readCount = responseStream.Read(buffer, 0, bufferSize); 
     } 
    }

來源

2016-12-28 07:28:31 Nino

我試過但結果是一樣的 – Prabu

郵編仍然是腐敗？ – Nino

是的，該文件仍然損壞 – Prabu

byte[] fileContents = Encoding.UTF8.GetBytes(responseReader.ReadToEnd());

你試圖解釋一個二進制PDF文件作爲UTF-8文本。這是行不通的。請參閱Upload and download a binary file to/from FTP server in C#/.NET。

來源

2016-12-28 08:52:56

我已經完全忽略了......但第二種方法應該工作（使用的BinaryWriter寫入流時）。 – Nino

我明白你的第二個代碼工作（*「但下載的zip文件時，後來的一個完美的做工作」 *）。不是嗎？ –

呀後來一個下載完美。 – Prabu

，這裏是我的解決方案，爲我工作

C＃

public IActionResult GetZip([FromBody] List<DocumentAndSourceDto> documents) 
{ 
    List<Document> listOfDocuments = new List<Document>(); 

    foreach (DocumentAndSourceDto doc in documents) 
     listOfDocuments.Add(_documentService.GetDocumentWithServerPath(doc.Id)); 

    using (var ms = new MemoryStream()) 
    { 
     using (var zipArchive = new ZipArchive(ms, ZipArchiveMode.Create, true)) 
     { 
      foreach (var attachment in listOfDocuments) 
      { 
       var entry = zipArchive.CreateEntry(attachment.FileName); 

       using (var fileStream = new FileStream(attachment.FilePath, FileMode.Open)) 
       using (var entryStream = entry.Open()) 
       { 
        fileStream.CopyTo(entryStream); 
       } 
      } 

     } 
     ms.Position = 0; 
     return File(ms.ToArray(), "application/zip"); 
    } 

    throw new ErrorException("Can't zip files"); 
}

不要錯過ms.Position = 0;這裏

來源

2017-11-20 17:23:20 Fitch

Zip文件越來越損壞

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