Question

我有以下控制器。当我搜索特定年级时，我会得到一个列表。我想要的是将此结果导出为excel。我的导出按钮工作正常。但唯一的一点是，当我点击它时，它会尝试将db中的所有内容导出为excel。我想要的只是导出结果。任何的想法？

public ActionResult Index(string searchBy, string search)
    {
        if (!String.IsNullOrEmpty(searchBy) && !String.IsNullOrEmpty(search))
        {
            if (searchBy == "ID")
            {
                return View(db.students.Where(x => x.id==search).ToList());
            }
            else if (searchBy == "grade")
            {
                return View(db.students.Where(x => x.grade == search).ToList());
            }
        else
        {
            return View(db.students.Take(0));
        }
    }

     public ActionResult ExportData()
    {
        GridView gv = new GridView();
        gv.DataSource = db.students.ToList();
        gv.DataBind();
        Response.ClearContent();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment; filename=students.xls");
        Response.ContentType = "application/ms-excel";
        Response.Charset = "";
        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);
        gv.RenderControl(htw);
        Response.Output.Write(sw.ToString());
        Response.Flush();
        Response.End();

        return RedirectToAction("Home");
    }

这是我的索引视图中的一部分：

  @using (Html.BeginForm("ExportData", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
            {
                <table>
                    <tr>
                        <td></td>
                        <td>
                            <input type="submit" name="Export" id="Export" value="Export" />
                        </td>
                    </tr>

                </table>
            }

Answer 1

您的ExportData()操作只是检索db.students的每个结果，它不知道您的视图中的内容。
假设您的学生列表包含您想要的所有数据，您可以将整个列表发布到您的操作中，例如：

public ActionResult ExportData(List<Student> students)
{
    GridView gv = new GridView();
    gv.DataSource = students;
    gv.DataBind();
    Response.ClearContent();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment; filename=students.xls");
    Response.ContentType = "application/ms-excel";
    Response.Charset = "";
    StringWriter sw = new StringWriter();
    HtmlTextWriter htw = new HtmlTextWriter(sw);
    gv.RenderControl(htw);
    Response.Output.Write(sw.ToString());
    Response.Flush();
    Response.End();

    return RedirectToAction("Home");
}

或者您可以传递搜索参数并相应地过滤数据库，例如

public ActionResult ExportData(string searchBy, string search)
{

    GridView gv = new GridView();
    if (!String.IsNullOrEmpty(searchBy) && !String.IsNullOrEmpty(search))
    {
        if (searchBy == "ID")
        {
            gv.DataSource = db.students.Where(x => x.id==search).ToList();
        }
        else if (searchBy == "grade")
        {
            gv.DataSource = db.students.Where(x => x.grade == search).ToList();
        }
    }
    gv.DataBind();
    Response.ClearContent();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment; filename=students.xls");
    Response.ContentType = "application/ms-excel";
    Response.Charset = "";
    StringWriter sw = new StringWriter();
    HtmlTextWriter htw = new HtmlTextWriter(sw);
    gv.RenderControl(htw);
    Response.Output.Write(sw.ToString());
    Response.Flush();
    Response.End();

    return RedirectToAction("Home");
}

不要忘记从您的观点发布必要的数据。

将搜索结果导出为MVC 4中的优秀

1 个答案: