[英]Send and receive large file over streams in ASP.NET Web Api C#
我在一个项目中,我需要通过流将大型音频文件从客户端发送到服务器。 我正在使用ASP.NET Web Api在客户端和服务器之间进行通信。 我的客户端有一个“ SendFile”方法,我认为它可以正常工作,但是我不知道如何使服务器接收通过流发送的数据。 到目前为止,我的客户代码如下:
private const int MAX_CHUNK_SIZE = (1024 * 5000);
private HttpWebRequest webRequest = null;
private FileStream fileReader = null;
private Stream requestStream = null;
public bool SendAudio(string uri, string file)
{
byte[] fileData;
fileReader = new FileStream(file, FileMode.Open, FileAccess.Read);
webRequest = (HttpWebRequest)WebRequest.Create(uri);
webRequest.Method = "POST";
webRequest.ContentLength = fileReader.Length;
webRequest.Timeout = 600000;
webRequest.Credentials = CredentialCache.DefaultCredentials;
webRequest.AllowWriteStreamBuffering = false;
requestStream = webRequest.GetRequestStream();
long fileSize = fileReader.Length;
long remainingBytes = fileSize;
int numberOfBytesRead = 0, done = 0;
while (numberOfBytesRead < fileSize)
{
SetByteArray(out fileData, remainingBytes);
done = WriteFileToStream(fileData, requestStream);
numberOfBytesRead += done;
remainingBytes -= done;
}
fileReader.Close();
return true;
}
public int WriteFileToStream(byte[] fileData, Stream requestStream)
{
int done = fileReader.Read(fileData, 0, fileData.Length);
requestStream.Write(fileData, 0, fileData.Length);
return done;
}
private void SetByteArray(out byte[] fileData, long bytesLeft)
{
fileData = bytesLeft < MAX_CHUNK_SIZE ? new byte[bytesLeft] : new byte[MAX_CHUNK_SIZE];
}
我的服务器如下所示:
[HttpPost]
[ActionName("AddAudio")]
public async Task<IHttpActionResult> AddAudio([FromUri]string name)
{
try
{
isReceivingFile = true;
byte[] receivedBytes = await Request.Content.ReadAsByteArrayAsync();
if (WriteAudio(receivedBytes, name) == true)
{
isReceivingFile = false;
return Ok();
}
else
{
isReceivingFile = false;
return BadRequest("ERROR: Audio could not be saved on server.");
}
}
catch (Exception ex)
{
isReceivingFile = false;
return BadRequest("ERROR: Audio could not be saved on server.");
}
}
public bool WriteAudio(byte[] receivedBytes, string fileName)
{
string file = Path.Combine(@"C:\Users\username\Desktop\UploadedFiles", fileName);
using (FileStream fs = File.Create(file))
{
fs.Write(receivedBytes, 0, receivedBytes.Length);
}
return true;
}
服务器代码具有我为此编写的原始代码,然后才决定尝试使其与流一起使用。 如果我发送一个小文件(小于30 MB),则服务器代码仍然有效,但是如果我发送一个大文件,则服务器将收到“ outofmemoryexception”。 我不知道如何使服务器通过流接收数据。 在寻找解决方案的过程中,我遇到了很多有关套接字和TCPClient的示例,但这并不是我们想要在此项目中进行的。 有人可以帮忙吗?
如果我发送一个大文件,我的服务器将收到“ outofmemoryexception”
好吧,它正在将整个流读取到内存中:
byte[] receivedBytes = await Request.Content.ReadAsByteArrayAsync();
您要做的就是将流从一个位置复制到另一位置, 而无需立即将其全部加载到内存中。 这样的事情应该起作用:
[HttpPost]
[ActionName("AddAudio")]
public async Task<IHttpActionResult> AddAudio([FromUri]string name)
{
try
{
string file = Path.Combine(@"C:\Users\username\Desktop\UploadedFiles", fileName);
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write,
FileShare.None, 4096, useAsync: true))
{
await Request.Context.CopyToAsync(fs);
}
return Ok();
}
catch (Exception ex)
{
return BadRequest("ERROR: Audio could not be saved on server.");
}
}
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