o//此处以生成表App_Transaction.js为例
import gridHeader from "./App_TransactionGridHeader.vue"
//App_Transaction.js文件
var extension = {
  components: {
    //动态扩充组件或组件路径
    //表单header、content、footer对应位置扩充的组件
    gridHeader: gridHeader, 
    gridBody: "",
    gridFooter: "",
    //弹出框(修改、编辑、查看)header、content、footer对应位置扩充的组件
    modelHeader: "",
    modelBody: "",
    modelFooter: ""
  },
  buttons: [], //扩展的按钮
  methods: {
    //事件扩展
    import() {//覆盖导入事件
      this.$refs.gridHeader.openModel();
    }
  }
};
export default extension;

//App_Transaction.js同目录添加App_TransactionGridHeader.vue文件
<template>
  <VolBox
    v-model="model"
    title="弹出框标题"
    :width="600"
    :padding="15"
  >
    <div style="display: flex">
      <el-input v-model="value1" placeholder="参数1"
      />
      <el-input v-model="value2" placeholder="参数2" />
    </div>
    <UploadExcel
      :url="url"
      :template="template"
      :importExcelBefore="importExcelBefore"
    ></UploadExcel>
  </VolBox>
</template>
<script>
import VolBox from "@/components/basic/VolBox.vue"
import UploadExcel from "@/components/basic/UploadExcel.vue"
export default {
  components: {
    VolBox: VolBox,
    UploadExcel:UploadExcel
  },
  data() {
    return {
      url: "api/表名/import1", //导入的路径 
      template: { //下载模板的配置
        url:this.http.ipAddress+"api/表名/DownLoadTemplate",//下载模板的路径 
        fileName: "测试参数", //模板的文件名
      },
      model: false,
      value1: "", //参数1
      value2: "",//参数2
    };
  },
  methods: {
    openModel() {
      this.model = true;
    },
    importExcelBefore(formData) { //点击上传时，将其他参数提交到后台
      formData.append("val1", this.value1);
      formData.append("val2", this.value2);
      return true;
    },
  },
};
</script>

//后台控制器方法App_TransactionController
[HttpPost, Route("Import1")]
[ApiActionPermission(Core.Enums.ActionPermissionOptions.Import)]
public ActionResult Import1(List<IFormFile> fileInput, string val1, string val2)
{
    Console.WriteLine(val1);
    Console.WriteLine(val2);
    return Json(Service.Import(fileInput));
}