web API图片上传

最近研究了下webapi服务器下图片的上传功能,屁话不多说,直接看代码吧

 public Task<HttpResponseMessage> PostFormData()  
        {  
            // Check if the request contains multipart/form-data.  
            // 检查该请求是否含有multipart/form-data  
            if (!Request.Content.IsMimeMultipartContent())  
            {  
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);  
            }  

            string root = HttpContext.Current.Server.MapPath("~/userImage");  
            var provider = new MultipartFormDataStreamProvider(root);  

            // Read the form data and return an async task.  
            // 读取表单数据，并返回一个async任务  
            var task = Request.Content.ReadAsMultipartAsync(provider).  
                ContinueWith<HttpResponseMessage>(t =>  
                {  
                    if (t.IsFaulted || t.IsCanceled)  
                    {  
                        Request.CreateErrorResponse(HttpStatusCode.InternalServerError, t.Exception);  
                    }  

                    // This illustrates how to get the file names.  
                    // 以下描述了如何获取文件名  
                    foreach (MultipartFileData file in provider.FileData)  
                    {  
                        //新文件夹路径  
                        string newRoot = root + "\\" + provider.FormData.GetValues(1)[0].ToString();  
                        if (!Directory.Exists(newRoot))  
                        {  
                            Directory.CreateDirectory(newRoot);  
                        }  
                        Trace.WriteLine(file.Headers.ContentDisposition.FileName);  
                        Trace.WriteLine("Server file path: " + file.LocalFileName);  
                        if (File.Exists(file.LocalFileName))   
                        {  
                            //原文件名称  
                            string fileName = file.Headers.ContentDisposition.FileName.Substring(1, file.Headers.ContentDisposition.FileName.Length - 2);  
                            //新文件名称   随机数  
                            string newFileName = provider.FormData.GetValues(0)[0] + "." + fileName.Split(new char[] { '.' })[1];  
                            File.Move(file.LocalFileName, newRoot + "\\" + newFileName);  
                        }  
                    }  
                    return Request.CreateResponse(HttpStatusCode.OK);  
                });  

            return task;  
        }

这个也是在网上找的资料,在此基础上添加了修改文件名功能,图片会保存在userimage文件夹下的子目录(如没有userimage就手动创建个),子目录的名称为客户端task.addData("","")添加的内容,文件名为客户端生成的随机数.