如何在MVC上实现图片上传的功能

怎么在MVC上实现图片上传的功能
要求上传到一个文件夹 然后读取文件夹的路径 保存到数据库中
------解决思路----------------------

// 检查是否是 multipart/form-data 

            if (!Request.Content.IsMimeMultipartContent("form-data"))

                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);

            // 设置上传目录 

            var provider = new MultipartFormDataStreamProvider("F:\\");


            var queryp = Request.GetQueryNameValuePairs();//获得查询字符串的键值集合 

            Hashtable hash = new Hashtable();

            var bodyparts = await Request.Content.ReadAsMultipartAsync(provider);

            int i = -1;

            foreach (var bodypart in bodyparts.FileData)

            {

                i++;

                string key1 = "error" + i;

                string key2 = "errmsg" + i;

                hash[key1] = 1;

                hash[key2] = "上传出错";

                string orfilename = bodypart.Headers.ContentDisposition.FileName.TrimStart('"').TrimEnd('"');

                FileInfo fileinfo = new FileInfo(bodypart.LocalFileName);

                //最大文件大小 

                int maxSize = 100000000;

                if (fileinfo.Length <= 0)

                {

                    hash[key1] = 1;

                    hash[key2] = "请选择上传文件。";

                }

                else if (fileinfo.Length > maxSize)

                {

                    hash[key1] = 1;

                    hash[key2] = "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 

                    const string fileTypes = "gif,jpg,jpeg,png,bmp";

                    if (String.IsNullOrEmpty(fileExt) 
------解决思路----------------------
 Array.IndexOf(fileTypes.Split(','), fileExt.Substring(1).ToLower()) == -1)

                    {

                        hash[key1] = 1;

                        hash[key2] = "上传文件扩展名是不允许的扩展名。";

                    }

                    else

                    {

                        String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);

                        fileinfo.CopyTo(Path.Combine("F:\\", newFileName + fileExt), true);

                        fileinfo.Delete();

                        hash[key1] = 0;

                        hash[key2] = "上传成功";

                    }

                }

            }

            return hash;   

html的页面就不用给了吧