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  • ASP.net WebAPI 上传图片

            [HttpPost]
            public Task<Hashtable> ImgUpload()
            {
                // 检查是否是 multipart/form-data
                if (!Request.Content.IsMimeMultipartContent("form-data"))
                    throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
                //文件保存目录路径
                string SaveTempPath = "~/SayPlaces/" + "/SayPic/SayPicTemp/";
                String dirTempPath = HttpContext.Current.Server.MapPath(SaveTempPath);
                // 设置上传目录
                var provider = new MultipartFormDataStreamProvider(dirTempPath);
                //var queryp = Request.GetQueryNameValuePairs();//获得查询字符串的键值集合
                var task = Request.Content.ReadAsMultipartAsync(provider).
                    ContinueWith<Hashtable>(o =>
                    {
                        Hashtable hash = new Hashtable();
                        hash["error"] = 1;
                        hash["errmsg"] = "上传出错";
                        var file = provider.FileData[0];//provider.FormData
                        string orfilename = file.Headers.ContentDisposition.FileName.TrimStart('"').TrimEnd('"');
                        FileInfo fileinfo = new FileInfo(file.LocalFileName);                    
                        //最大文件大小
                        int maxSize = 10000000;
                        if (fileinfo.Length <= 0)
                        {
                            hash["error"] = 1;
                            hash["errmsg"] = "请选择上传文件。";
                        }
                        else if (fileinfo.Length > maxSize)
                        {
                            hash["error"] = 1;
                            hash["errmsg"] = "上传文件大小超过限制。";
                        }
                        else
                        {
                            string fileExt = orfilename.Substring(orfilename.LastIndexOf('.'));
                            //定义允许上传的文件扩展名
                            String fileTypes = "gif,jpg,jpeg,png,bmp";
                            if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(fileTypes.Split(','), fileExt.Substring(1).ToLower()) == -1)
                            {
                                hash["error"] = 1;
                                hash["errmsg"] = "上传文件扩展名是不允许的扩展名。";
                            }
                            else
                            {
                                String ymd = DateTime.Now.ToString("yyyyMMdd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                                String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                                fileinfo.CopyTo(Path.Combine(dirTempPath, newFileName + fileExt), true);
                                fileinfo.Delete();
                                hash["error"] = 0;
                                hash["errmsg"] = "上传成功";
                            }
                        }
                        return hash;
                    });
                return task;
            }
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  • 原文地址:https://www.cnblogs.com/csdlee/p/3476173.html
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