C#文件上传

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
namespace YFAPICommon.Controllers
{
    public class FileBase64Input
    {
        public string base64 { set; get; }
    }
    public class UploadFileOutput
    {
        public string url { set; get; }
        public int error { set; get; }
        public string msg { set; get; }
    }
    public class UploadFileOutputCkeditor
    {
        public string url { set; get; }
        public int uploaded { set; get; }
    }
    /// <summary>
    /// 文件上传
    /// </summary>
    public class UploadFileController : ApiController
    {
        private static string serverPath = System.Configuration.ConfigurationSettings.AppSettings["serverPath"];
        private static string localPath = System.Configuration.ConfigurationSettings.AppSettings["localPath"];
        [HttpPost]
        public UploadFileOutput UploadWithStream()
        {
            System.Web.HttpContext context = System.Web.HttpContext.Current;
            UploadFileOutput returnNode = new UploadFileOutput();
            string date = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString();
            int cout = context.Request.Files.Count;
            if (cout > 0)
            {
                System.Web.HttpPostedFile hpf = context.Request.Files[0];
                if (hpf != null)
                {
                    string fileExt = Path.GetExtension(hpf.FileName).ToLower();
                    //只能上传文件，过滤不可上传的文件类型     
                    string fileFilt = ".gif|.jpg|.bmp|.jpeg|.png";