ASP.NetWebAPIアップロード画像の例

 
  
[HttpPost] 
  
public Task ImgUpload() 
  
{ 
  
    //       multipart/form-data 
  
    if (!Request.Content.IsMimeMultipartContent("form-data")) 
  
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); 
  
    //         
  
    string SaveTempPath = "~/SayPlaces/" + "/SayPic/SayPicTemp/"; 
  
    String dirTempPath = HttpContext.Current.Server.MapPath(SaveTempPath); 
  
    //        
  
    var provider = new MultipartFormDataStreamProvider(dirTempPath); 
  
    //var queryp = Request.GetQueryNameValuePairs();//             
  
    var task = Request.Content.ReadAsMultipartAsync(provider). 
  
        ContinueWith(o => 
  
        { 
  
            Hashtable hash = new Hashtable(); 
  
            hash["error"] = 1; 
  
            hash["errmsg"] = "    "; 
  
            var file = provider.FileData[0];//provider.FormData 
  
            string orfilename = file.Headers.ContentDisposition.FileName.TrimStart('"').TrimEnd('"'); 
  
            FileInfo fileinfo = new FileInfo(file.LocalFileName);                     
  
            //       
  
            int maxSize = 10000000; 
  
            if (fileinfo.Length <= 0) 
  
            { 
  
                hash["error"] = 1; 
  
                hash["errmsg"] = "       。"; 
  
            } 
  
            else if (fileinfo.Length > maxSize) 
  
            { 
  
                hash["error"] = 1; 
  
                hash["errmsg"] = "          。"; 
  
            } 
  
            else 
  
            { 
  
                string fileExt = orfilename.Substring(orfilename.LastIndexOf('.')); 
  
                //             
  
                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"] = "               。"; 
  
                } 
  
                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"] = "    "; 
  
                } 
  
            } 
  
            return hash; 
  
        }); 
  
    return task; 
  
}