1.5 WEB API 上传文件

1.前提，设置跨域 

2.在控制器头添加允许跨域

  /// <summary>
    /// 文件管理口控制器
    /// </summary>
    [EnableCors("*", "*", "*")]
    [RoutePrefix("File")]
    public class FileController 

 3.上传方法

  /// <summary>
        /// 图片上传  [FromBody]string token
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        [Route("Upload/ImgUpload")]
        public ResponseModel ImgUpload()
        {
            ResponseModel response = new ResponseModel();
            // 文件保存目录路径 
            const string saveTempPath = "~/UploadFiles/";
            if (!Directory.Exists(HttpContext.Current.Server.MapPath(saveTempPath)))
            {
                Directory.CreateDirectory(HttpContext.Current.Server.MapPath(saveTempPath));
            }
            HttpFileCollection files = HttpContext.Current.Request.Files;
            const string fileTypes = "gif,jpg,jpeg,png,bmp";
            foreach (string key in files.AllKeys)
            {
                HttpPostedFile file = files[key];//file.ContentLength文件长度  

                if (file.ContentLength > AllConfig.CommonStaticConfigInfo.MaxFileSize * 1024)
                {
                    response.Fail("上传文件大小超过限制。");
                    return response; 
                }
                else
                {
                    var fileExt = file.FileName.Substring(file.FileName.LastIndexOf('.'));

                    if (String.IsNullOrEmpty(fileExt) ||
                        Array.IndexOf(fileTypes.Split(','), fileExt.Substring(1).ToLower()) == -1)
                    {
                        response.Fail("不支持上传文件类型。");
                        return response;
                    }
                    else
                    {
                        if (string.IsNullOrEmpty(file.FileName) == false)
                            file.SaveAs(HttpContext.Current.Server.MapPath(saveTempPath) + file.FileName);
                    }
                }
            }
            return response;
        }

 ResponseModel是自己实现的，有兴趣也可以看看，返回自己实现吧。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Model
{
    /// <summary>
    /// 响应参数父级类型
    /// </summary>
    public class ResponseModel
    {

        /// <summary>
        /// 构造
        /// </summary>
        public ResponseModel()
        {
            State = (int)RequestStateEnum.Success;
            Msg = "成功";
        }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="state">请求状态</param>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        /// <param name="msg">返回信息</param>
        public ResponseModel(RequestStateEnum state, string callback, string postTime, string msg)
        {
            State = (int)state;
            Callback = callback;
            PostTime = postTime;
            Msg = msg;
        }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        /// <param name="msg">返回信息</param>
        public ResponseModel(string callback, string postTime, string msg)
        {
            State = (int)RequestStateEnum.Success;
            Callback = callback;
            PostTime = postTime;
            Msg = msg;
        }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        public ResponseModel(string callback, string postTime)
        {
            State = (int)RequestStateEnum.Success;
            Callback = callback;
            PostTime = postTime;
            Msg = "成功";
        }
        /// <summary>
        /// 请求状态
        /// </summary>
        public int State { get; protected set; }
        /// <summary>
        /// 透传字段
        /// </summary>
        public string Callback { get; set; }

        /// <summary>
        /// 请求时间
        /// </summary>
        public string PostTime { get; set; }



        /// <summary>
        /// 返回信息
        /// </summary>
        public string Msg { get; protected set; }

        /// <summary>
        /// 错误
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="state"></param>
        public void Fail(string msg, RequestStateEnum state = RequestStateEnum.Error)
        {
            Msg = msg;
            State = (int)state;
        }
        /// <summary>
        /// 错误，根据错误短语获取错误详细描述
        /// </summary>
        /// <param name="shortMsg">错误短语</param>
        public void Fails(string shortMsg)
        {
            Msg = AllMsg.GetMsg(shortMsg);
            State = (int)RequestStateEnum.Error;
        }



        /// <summary>
        /// 系统级错误
        /// </summary>
        /// <param name="msg"></param>
        public void SystemErr(string msg)
        {
            Msg = msg;
            State = (int)RequestStateEnum.SystemErr;
        }

        /// <summary>
        /// 成功
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="state"></param>
        public void Success(string msg, RequestStateEnum state = RequestStateEnum.Success)
        {
            this.Msg = msg;
            State = (int)RequestStateEnum.Success;
        }
        /// <summary>
        /// 未登录验证
        /// </summary>
        public void NeedLogin()
        {
            this.Msg = "请登录系统后再进行操作！";
            State = (int)RequestStateEnum.NeedLogin;
        }
        private string RealName;
        public void SetRealName(string realName)
        {
            RealName = realName;
        }

        public string GetRealName() { return RealName; }


        private string RequestJson;

        public void SetRequestJson(string requestJson)
        {
            RequestJson = requestJson;
        }

        public string GetRequestJson() { return RequestJson; }
    }


    /// <summary>
    /// 返回的父级类型
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class ResponseModel<T> : ResponseModel where T : new()
    {

        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="state">请求状态</param>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        /// <param name="msg">返回信息</param>
        /// <param name="postContent">返回泛型</param>
        public ResponseModel(RequestStateEnum state, string callback, string postTime, string msg, T postContent)
        {
            State = (int)state;
            Callback = callback;
            PostTime = postTime;
            Msg = msg;
            PostContent = postContent;
        }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        /// <param name="msg">返回信息</param>
        public ResponseModel(string callback, string postTime, string msg) : base(callback, postTime, msg)
        {
            //PostContent = new T();
        }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="callback">透传字段</param>
        /// <param name="postTime">请求时间</param>
        public ResponseModel(string callback, string postTime) : base(callback, postTime)
        { //PostContent = new T();
        }
        /// <summary>
        /// 构造
        /// </summary>
        public ResponseModel()
        {
            PostContent = new T();
        }
        /// <summary>
        /// 请求内容类以及返回内容类
        /// </summary>
        public T PostContent { get; set; }

        /// <summary>
        /// 错误
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="state"></param>
        /// <param name="obj"></param>
        public void Fail(string msg, T obj, RequestStateEnum state = RequestStateEnum.Error)
        {
            PostContent = obj;
            Msg = msg;
            State = (int)state;
        }



        /// <summary>
        /// 成功
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="msg"></param>
        /// <param name="state"></param>
        public void Success(T obj, string msg = null, RequestStateEnum state = RequestStateEnum.Success)
        {
            Msg = msg;
            this.PostContent = obj;
            State = (int)state;
        }
        /// <summary>
        /// 成功
        /// </summary>
        /// <param name="obj"></param>
        public void Success(T obj)
        {
            this.PostContent = obj;
            State = (int)RequestStateEnum.Success;
        }
    }


}

4.html代码

<!doctype>
<head>
  <script src="jquery-1.10.2.min.js"></script>
  <!--<script src="jquery-1.11.1.js"></script>-->
  <!--<script src="ajaxfileupload.js"></script>-->
  <script>
    $(document).ready(function () {
      var appDomain = "http://localhost/TLSC.Api.File/";
      $("#btn_fileUpload").click(function () {
        /**
         * 用ajax方式上传文件  -----------
         * */
        //-------asp.net webapi fileUpload
        //
        var formData = new FormData($("#uploadForm")[0]);
        $.ajax({
          url: appDomain + 'File/Upload/ImgUpload',
          type: 'POST',
          data: formData,
          async: false,
          cache: false,
          contentType: false,
          processData: false,
          success: function (data) {
            console.log(JSON.stringify(data));
          },
          error: function (data) {
            console.log(JSON.stringify(data));
          }
        });
        //----end asp.net webapi fileUpload
        //----.net core webapi fileUpload
        // var fileUpload = $("#files").get(0);
        // var files = fileUpload.files;
        // var data = new FormData();
        // for (var i = 0; i < files.length; i++) {
        //    data.append(files[i].name, files[i]);
        // }
        // $.ajax({
        //   type: "POST",
        //   url: appDomain+'api/Files',
        //   contentType: false,
        //   processData: false,
        //   data: data,
        //   success: function (data) {
        //     console.log(JSON.stringify(data));
        //   },
        //   error: function () {
        //     console.log(JSON.stringify(data));
        //   }
        // });
        //--------end net core webapi fileUpload
        /**
         * ajaxfileupload.js 方式上传文件
         * */
        // $.ajaxFileUpload({
        //   type: 'post',
        //   url: appDomain + 'api/Files',
        //   secureuri: false,
        //   fileElementId: 'files',
        //   success: function (data) {
        //     console.log(JSON.stringify(data));
        //   },
        //   error: function () {
        //     console.log(JSON.stringify(data));
        //   }
        // });
      });
      //end click
    })
  </script>
</head>
<title></title>
<body>
  <article>
    <header>
      <h2>article-form</h2>
    </header>
    <p>
      <form action="/" method="post" id="uploadForm" enctype="multipart/form-data">
        <input type="file" id="files" name="files" placeholder="file" multiple>file-multiple属性可以选择多项<br><br>
        <input type="button" id="btn_fileUpload" value="fileUpload">
      </form>
    </p>
  </article>
</body>

6.上传成功

demo就不贴了，拷贝上面的代码直接写就行了。