C# WebDAV传输大文件时如何避免内存溢出

在C#中，使用WebDAV传输大文件时，为了避免内存溢出，可以采用以下方法：

1. 分块传输：将大文件分成较小的数据块，然后逐个上传。这样可以避免一次性加载整个文件到内存中。

private const int ChunkSize = 4096; // 4KB  public async Task UploadLargeFileAsync(string filePath, string uploadUrl) {     using (var fileStream = File.OpenRead(filePath))     {         var buffer = new byte[ChunkSize];         int bytesRead;         long totalBytesRead = 0;          while ((bytesRead = await fileStream.ReadAsync(buffer, 0, buffer.Length)) > 0)         {             // 上传数据块到WebDAV服务器             await UploadChunkAsync(uploadUrl, buffer, bytesRead, totalBytesRead);             totalBytesRead += bytesRead;         }     } }  private async Task UploadChunkAsync(string uploadUrl, byte[] chunk, int chunkSize, long startPosition) {     using (var client = new HttpClient())     {         var request = new HttpRequestMessage(HttpMethod.Put, uploadUrl);         request.Headers.Add("Content-Range", $"bytes {startPosition}-{startPosition + chunkSize - 1}/{chunkSize}");         request.Content = new ByteArrayContent(chunk, 0, chunkSize);          var response = await client.SendAsync(request);         response.EnsureSuccessStatusCode();     } } 

2. 使用流式传输：使用流式传输可以在读取文件的同时进行上传，而不需要将整个文件加载到内存中。

public async Task UploadLargeFileAsync(string filePath, string uploadUrl) {     using (var fileStream = File.OpenRead(filePath))     {         using (var client = new HttpClient())         {             var content = new StreamContent(fileStream);             var response = await client.PutAsync(uploadUrl, content);             response.EnsureSuccessStatusCode();         }     } } 

3. 调整缓冲区大小：在使用HttpClient发送请求时，可以通过设置HttpClientHandler.MaxRequestContentBufferSize属性来调整缓冲区大小。这将限制HttpClient在发送请求时所使用的内存。

public async Task UploadLargeFileAsync(string filePath, string uploadUrl) {     using (var fileStream = File.OpenRead(filePath))     {         using (var handler = new HttpClientHandler())         {             handler.MaxRequestContentBufferSize = ChunkSize;              using (var client = new HttpClient(handler))             {                 var content = new StreamContent(fileStream);                 var response = await client.PutAsync(uploadUrl, content);                 response.EnsureSuccessStatusCode();             }         }     } } 

通过以上方法，可以有效地避免在使用C# WebDAV传输大文件时出现内存溢出的问题。