C# 在.Net中下载失败

您好，我在此代码中遇到问题：

// Function will return the number of bytes processed
// to the caller. Initialize to 0 here.
int bytesProcessed = 0;

// Assign values to these objects here so that they can
// be referenced in the finally block
Stream remoteStream = null;
Stream localStream = null;
WebResponse response = null;

// Use a try/catch/finally block as both the WebRequest and Stream
// classes throw exceptions upon error
try
{
    // Create a request for the specified remote file name
    WebRequest request = WebRequest.Create(remoteFilename);
    request.Method = "GET";
    string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(uName + ":" + pwd));
    request.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials;

    if (request != null)
    {
        // Send the request to the server and retrieve the
        // WebResponse object 
        response = request.GetResponse();
        if (response != null)
        {
            // Once the WebResponse object has been retrieved,
            // get the stream object associated with the response's data
            remoteStream = response.GetResponseStream();

            // Create the local file
            localStream = File.Create(localFilename);

            // Allocate a 1k buffer
            byte[] buffer = new byte[1024];
            int bytesRead;
            long totalBytesToProcess = response.ContentLength;

            // Simple do/while loop to read from stream until
            // no bytes are returned
            do
            {
                // Read data (up to 1k) from the stream
                bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
                // Write the data to the local file
                localStream.Write(buffer, 0, bytesRead);

                // Increment total bytes processed
                bytesProcessed += bytesRead;
                log(resourcesPath + "/BytesRecieved.txt", bytesProcessed.ToString()+"/"+ totalBytesToProcess.ToString(), false);
            } while (bytesRead > 0);
        }
    }
}
catch (Exception ex)
{
    Response.Write(ex);
   // log(resourcesPath +"/Logs.txt",);
}
finally
{
    // Close the response and streams objects here 
    // to make sure they're closed even if an exception
    // is thrown at some point
    if (response != null) response.Close();
    if (remoteStream != null) remoteStream.Close();
    if (localStream != null) localStream.Close();
}

// Return total bytes processed to caller.
return bytesProcessed;

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它能够下载200 mb大小的小文件，不幸的是，当文件大小飙升到1gb以上时，它就失败了。我试过下载web客户端的FileAsyc，但也失败了。是否有其他方法处理此问题的大文件？

分配大于预期文件大小的缓冲区大小

字节[]byteBuffer=新字节[65536]

因此，如果文件大小为1GB，则分配1GiB缓冲区，然后尝试在一次调用中填充整个缓冲区。 此填充可能返回更少的字节，但您仍然分配了整个缓冲区。请注意，.NET中单个数组的最大长度是32位数字，这意味着即使您将程序重新编译为64位，并且实际上有足够的可用内存

请访问此链接以供参考：

---

失败意味着什么？有错误消息吗？请注意，您可以通过使用

using

语句而不是显式调用

Close

来删除一堆代码，也可以通过调用

Stream.CopyTo

来删除代码，除非日志记录特别重要。实际上不是错误消息。它只是停止下载，文件就被破坏了。这是垃圾，就这么停了？代码完成了吗？@john是的，代码实际上已经完成了。它能够下载小文件。这似乎解决了我的问题。我将继续对我将要进行的过程保持警惕，比如下载更大的文件。非常感谢。@OneLazy很高兴听到它解决了您的问题。：）