C# .Net Core 在后台Post单个文件调用接口的方法
1 /// <summary> 2 /// Post单个文件 3 /// </summary> 4 /// <typeparam name="T">返回结果</typeparam> 5 /// <param name="url">提交地址</param> 6 /// <param name="fieldName">参数名称</param> 7 /// <param name="file">文件信息</param> 8 /// <returns></returns> 9 public static T PostSingleFile<T>(string url ,string fieldName, PostFileItem file) 10 { 11 Stream fs = file.FileStream; 12 if (!fs.CanRead) 13 { 14 return default; 15 } 16 byte[] buffer = new byte[fs.Length]; 17 fs.Read(buffer, 0, (int)fs.Length); 18 fs.Close(); 19 20 string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x"); 21 string PREFIX = "--", LINE_END = "\r\n"; 22 23 StringBuilder sb = new StringBuilder(); 24 sb.Append(PREFIX + boundary + LINE_END); 25 sb.Append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + file.FileName + "\"" + LINE_END); 26 sb.Append("Content-Type: " + file.ContentType + LINE_END + LINE_END); 27 WebRequest request = WebRequest.Create(url); 28 request.Method = "POST"; 29 request.ContentType = "multipart/form-data;boundary=" + boundary; 30 Stream dataStream = request.GetRequestStream(); 31 dataStream.Write(Encoding.UTF8.GetBytes(sb.ToString()), 0, Encoding.UTF8.GetByteCount(sb.ToString())); 32 dataStream.Write(buffer, 0, buffer.Length); 33 dataStream.Write(Encoding.UTF8.GetBytes(LINE_END + PREFIX + boundary + PREFIX + LINE_END), 0, Encoding.UTF8.GetByteCount(LINE_END + PREFIX + boundary + PREFIX + LINE_END)); 34 dataStream.Close(); 35 36 WebResponse webResponse = request.GetResponse(); 37 Stream newStream = webResponse.GetResponseStream(); 38 39 StreamReader rdr = new StreamReader(newStream); 40 var result = rdr.ReadToEnd(); 41 42 if (!string.IsNullOrEmpty(result)) 43 return JsonUtil.ConvertJsonToObject<T>(result); 44 45 return default; 46 }
提交文件使用的工具类:
1 /// <summary> 2 /// 提交文件请求参数 3 /// </summary> 4 public class PostFileItem 5 { 6 /// <summary> 7 /// 文件数据流 8 /// </summary> 9 public Stream FileStream { get; set; } 10 /// <summary> 11 /// 文件名称 12 /// </summary> 13 public string FileName { get; set; } 14 /// <summary> 15 /// 文件类别 16 /// </summary> 17 public string ContentType { get; set; } 18 }