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在C#中实现文件上传可以通过使用HttpWebRequest类来发送HTTP POST请求,并在请求中包含要上传的文件。以下是一个示例代码,演示如何使用C#实现文件上传:
using System; using System.IO; using System.Net; class Program { static void Main(string[] args) { string url = "http://example.com/upload"; string filePath = "path/to/file.txt"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x"); request.ContentType = "multipart/form-data; boundary=" + boundary; using (Stream requestStream = request.GetRequestStream()) { using (StreamWriter writer = new StreamWriter(requestStream)) { writer.WriteLine("--" + boundary); writer.WriteLine("Content-Disposition: form-data; name=\"file\"; filename=\"" + Path.GetFileName(filePath) + "\""); writer.WriteLine("Content-Type: application/octet-stream"); writer.WriteLine(); using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read)) { byte[] buffer = new byte[4096]; int bytesRead; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { requestStream.Write(buffer, 0, bytesRead); } } writer.WriteLine(); writer.WriteLine("--" + boundary + "--"); } } using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { using (Stream responseStream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(responseStream)) { string responseText = reader.ReadToEnd(); Console.WriteLine(responseText); } } } } }
在上述代码中,首先创建一个HttpWebRequest对象,并设置请求的方法为POST。然后设置请求的Content-Type为multipart/form-data,并定义一个boundary用于分隔请求的不同部分。接着将文件内容写入请求的流中,并在结束时添加boundary标记。最后发送请求并读取响应内容。
请注意,以上示例中使用了HttpWebRequest类来实现文件上传,也可以考虑使用更方便的第三方库,如HttpClient来实现文件上传。