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。