<el-tabs value="treeType" type="border-card">

  <el-tab-pane name="treeType" label="按文件类型">

    <myTree :data="treeType" icon-class="el-icon-price-tag" @nodeClick="nodeTypeClick" />

  </el-tab-pane>

  <el-tab-pane name="treeCategory" label="按类别名称">

    <myTree :data="treeCategory" icon-class="el-icon-price-tag" @nodeClick="nodeCategoryClick" />

  </el-tab-pane>

</el-tabs>

        /// <summary>

        /// 获取所有类别(Distinct)

        /// </summary>

        /// <returns></returns>

        public virtual async Task<List<string>> GetAllCategory()

        {

            var query = Repository.GetAll().Where(s=> s.Category != null).OrderBy(s => s.Category);

            var list = query.Select(s => s.Category).Distinct().ToList();

            return await Task.FromResult(list);

        }

        public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)

        {

            ............

            app.UseStaticFiles();

            //指定特定的目录作为静态文件目录，如UploadFiles

            //是否可以访问静态文件

            app.UseStaticFiles(new StaticFileOptions

            {

                FileProvider = new PhysicalFileProvider(Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, "UploadFiles")),

                RequestPath = "/UploadFiles"

            }); 

            .........

        /// <summary>

        /// 对记录进行转义

        /// </summary>

        /// <param name="item">dto数据对象</param>

        /// <returns></returns>

        protected override void ConvertDto(FileUploadDto item)

        {

            //转义相对地址为绝对地址

            item.FileUrl = GetFileUrl(item.BasePath, item.SavePath);

        }

        /// <summary>

        /// 根据记录的basePath和savePath，以及HttpContext上下文确定绝对路径

        /// </summary>

        /// <param name="basePath">附件的基础路径</param>

        /// <param name="savePath">附件的保存路径</param>

        /// <returns></returns>

        private string GetFileUrl(string basePath, string savePath)

        {

            var httpContext = _httpContext.HttpContext;

            string serverRealPath = basePath.UriCombine(savePath);

            if (!Path.IsPathRooted(basePath) &&

                !basePath.StartsWith("http://") &&

                !basePath.StartsWith("https://"))

            {

                //如果是相对目录，加上当前程序的目录才能定位文件地址

                var url = string.Format("{0}://{1}", httpContext.Request.Scheme, httpContext.Request.Host.Value);

                serverRealPath = url.UriCombine(serverRealPath).Replace('\\', '/');

            }

            return serverRealPath;

        }

    <el-form-item label="封面图片">

      <el-upload

        ref="upload"

        action="/abp/services/app/FileUpload/PostUpload"

        list-type="picture-card"

        :on-preview="handlePictureCardPreview"

        :on-remove="handleRemove"

        :on-success="onSuccess"

        :on-error="onError"

        accept="image/jpeg,image/gif,image/png,image/bmp"

        :headers="myHeaders"

        :file-list="editForm.fileList"

      >

        <i class="el-icon-plus" />

      </el-upload>

      <el-dialog :visible.sync="dialogVisible">

        <img width="100%" :src="dialogImageUrl" alt="">

      </el-dialog>

    </el-form-item> 

  myHeaders: { Authorization: 'Bearer ' + getToken() }, // 用于上传文件的身份认证