element ui 上传控件携带参数到后端

1.携带固定参数：

2.携带不固定参数：

      <el-row> 
        <el-col :span="24">
          <el-upload
            :multiple="false"
            :show-file-list="false"
            :on-success="f_handleImageSuccess"
            :before-upload="f_HandleImageBefore"
            drag
            action=""
            :http-request="f_handleUploadForm"
            :auto-upload="true"
            :headers="importHeaders"
          >
            <i class="el-icon-upload" style="margin:10px 0px 0px 0px;" />
            <div class="el-upload__text">
              <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
              <div slot="tip" class="el-upload__tip">只能上传xls/xlsx/et文件，且不超过200MB</div>
            </div>
          </el-upload>
        </el-col> 
      </el-row>

 // 文件格式及文件大小验证
    f_HandleImageBefore(file) {
      let isJPG = false;
      if (file.name.indexOf('.xls') > -1 || file.name.indexOf('.xlsx') > -1 || file.name.indexOf('.et') > -1) { isJPG = true; }
      let isLt2M = file.size / 1024 / 1024 < 200;
      if (!isJPG) {
        this.$message.error('上传文件只能是XLS/XLSX/ET格式!');
      }
      if (!isLt2M) {
        this.$message.error('上传文件大小不能超过 200MB!');
      }
      return isJPG && isLt2M;
    },
    f_handleImageSuccess(file) {
      this.meternos = '';
      if (file.success) {
        this.$message({ showClose: true, message: '附件上传成功！', type: 'success' }); 
		    // this.$emit('queryList');		
      } else {
        this.$message({ showClose: true, message: file.message, type: 'error' });
      }
    },
    // 上传并携带参数
    f_handleUploadForm(param)
    {
      let formData = new FormData()
      // 在formData中加入我们需要的参数
      formData.append('file', param.file) //上传的文件
      formData.append('poid', this.fileUpload.poid) //参数:出库单号
    	formData.append('type', this.fileUpload.type) //参数:类型
      api_StockOutOverdueUploadFile(formData).then((response) => {
          if (response.success === true) {
            this.$message({ showClose: true, message: '附件上传成功！', type: 'success' }); 
          }
        });
    }

• js里面的请求方法：

//附件上传
export function api_StockOutOverdueUploadFile(data) {
  return request({
    url: '/maobao.mom.wms/v' + apiversion + '/purchaseorderdetail/StockOutOverdueUploadFile',
    method: 'post',
    data
  });
}

部分代码如下：

        [HttpPost, Route("StockOutOverdueUploadFile"), SwaggerFileUpload]
        [DisableRequestSizeLimit]
        public async Task<IActionResult> StockOutOverdueUploadFile()
        {
            //获取所有上传文件
            var files = Request.Form.Files;// 接收上传文件
            var poid = Request.Form["poid"].ToString();//接收传递的参数:出库单号
            var type = Request.Form["type"].ToString();//接收传递的参数:类型
        }

• 参考：(1)自定义elementui上传文件以及携带参数 https://blog.csdn.net/dupeng0811/article/details/89877527
  (2)Request.Form的用法 https://blog.csdn.net/dupeng0811/article/details/89877527