問題描述

我正在嘗試使用 C# (Framework 4)上傳一個 zip 文件到服務器，下面是我的代碼.

I am trying to upload a zip file to server using C# (Framework 4)and following is my code.

string ftpUrl = ConfigurationManager.AppSettings["ftpAddress"];
string ftpUsername = ConfigurationManager.AppSettings["ftpUsername"];
string ftpPassword = ConfigurationManager.AppSettings["ftpPassword"];  
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpUrl + "Transactions.zip");  
request.Proxy = new WebProxy(); //-----The requested FTP command is not supported when using HTTP proxy.
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
StreamReader sourceStream = new StreamReader(fileToBeUploaded);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);
            response.Close();  

zip 文件已成功上傳，但是當我嘗試從服務器(手動)打開 zip 文件時，它顯示 Unexpected end of archive 錯誤.
對于文件壓縮，我使用 Ionic.zip dll.在傳輸 zip 文件之前，我能夠成功解壓.

The zip file is uploaded successfully, but when I tried to open the zip file from server(manually), it showed me Unexpected end of archive error.
For file compression I am using Ionic.zip dll. Before transferring the zip file, I was able to extract successfully.

任何幫助表示贊賞.謝謝.

Any help appreciated. Thanks.

推薦答案

這是問題所在:

StreamReader sourceStream = new StreamReader(fileToBeUploaded);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());

StreamReader(和任何 TextReader)用于 text 數據.zip 文件不是文本數據.

StreamReader (and any TextReader) is for text data. A zip file isn't text data.

只需使用:

byte[] fileContents = File.ReadAllBytes(fileToBeUploaded);

這樣您就不會將二進制數據視為文本，因此它不應該被破壞.

That way you're not treating binary data as text, so it shouldn't get corrupted.

或者，不要單獨將其全部加載到內存中 - 只需流式傳輸數據:

Or alternatively, don't load it all into memory separately - just stream the data:

using (var requestStream = request.GetRequestStream())
{
    using (var input = File.OpenRead(fileToBeUploaded))
    {
        input.CopyTo(requestStream);
    }
}

還請注意，您應該對所有這些流使用 using 語句，而不僅僅是調用 Close - 這樣即使出現異常，資源也會被釋放扔了.

Also note that you should be using using statements for all of these streams, rather than just calling Close - that way the resources will be disposed even if an exception is thrown.

這篇關于使用 C# 上傳到服務器后，Zip 文件損壞的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！