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private static Stream GetPostStream(string filePath, NameValueCollection formData, string boundary) { Stream postDataStream = new System.IO.MemoryStream(); //adding form data string formDataHeaderTemplate = Environment.NewLine + "--" + boundary + Environment.NewLine + "Content-Disposition: form-data; name=\"{0}\";" + Environment.NewLine + Environment.NewLine + "{1}"; foreach (string key in formData.Keys) { byte[] formItemBytes = System.Text.Encoding.UTF8.GetBytes(string.Format(formDataHeaderTemplate, key, formData[key])); postDataStream.Write(formItemBytes, 0, formItemBytes.Length); } //adding file data FileInfo fileInfo = new FileInfo(filePath); string fileHeaderTemplate = Environment.NewLine + "--" + boundary + Environment.NewLine + "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"" + Environment.NewLine + "Content-Type: image/jpeg" + Environment.NewLine + Environment.NewLine; byte[] fileHeaderBytes = System.Text.Encoding.UTF8.GetBytes(string.Format(fileHeaderTemplate, "UploadCSVFile", fileInfo.FullName)); postDataStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length); FileStream fileStream = fileInfo.OpenRead(); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { postDataStream.Write(buffer, 0, bytesRead); } fileStream.Close(); byte[] endBoundaryBytes = System.Text.Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); postDataStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length); return postDataStream; }
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原文地址:http://www.cnblogs.com/wangxm123/p/4192192.html