Question

我是MVC的新手，任何帮助将不胜感激。我目前有一个显示数据表的页面。我想添加一个按钮，当单击该按钮时，会将一个附加过滤器添加到页面，如果再次单击将清除过滤器（切换功能）。

下面是我要使用的代码的预览。我相信该视图将满足我的需求，但是我不确定控制器。

查看按钮：

   <td width="15%">
        @if (ViewBag.curStatus == "NotFiltered")
        {
            @Html.ActionLink("Filter", "Index", new
       {
           sortOrder = ViewBag.CurrentSort,
           qryStatus = ""
       }, new { @class = "btn btn-primary btn-xs" })
        }
        else
        {
            @Html.ActionLink("Filter", "Index", new
       {
           sortOrder = ViewBag.CurrentSort,
           qryStatus = "Filtered"
       }, new { @class = "btn btn-default btn-xs" })
        }
    </td>

控制器：

 public ActionResult Table(string sortOrder, string currentFilter, string searchString, int? page)
        {
            ViewBag.CurrentSort = sortOrder;
            ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? 
              "invlocation" : "";
            ViewBag.curStatus = String.IsNullOrEmpty(sortOrder) ? 
              "NotFiltered" : "Filtered";

        var samples = from s in db.Table1
                      select s;

            switch (sortOrder)
            {
                case "NotFiltered":
                   string selectqry = "select * from Table1 where datereceived is null ";
                   selectqry = selectqry + " and submissionid not in (select id from Table2 where status='Done')";
                   break;
                case "Filtered":                   
                   selectqry = selectqry + " and status <> 'Pending'";
                   break;
            }

            List<vFiltered> list = db.Table1.SqlQuery(selectqry).ToList();

            int pageSize = 10;
            int pageNumber = (page ?? 1);
            return View(vFiltered.ToPagedList(pageNumber, pageSize));
        }

Answer 1

我要提到的第一件事是，您的MVC模式有些松散，并且控制器中的代码比我选择的要多得多。

我和IMO最好的方法是将逻辑转移到业务层或存储库中。

在存储库中/查询：

string selectqry = "select * from Table1 where datereceived is null ";

总是发生，因此它应该在if / case语句之外。

如果您不使用Entity Framework，并且想要手动构建查询，则可以执行以下操作：

 switch (sortOrder)
        {
            case "NotFiltered":
               selectqry = selectqry + " and submissionid not in (select id from Table2 where status='Done')";
               break;
            case "Filtered":                   
               selectqry = selectqry + " and status <> 'Pending'";
               break;
        }

或更干净一点：

Dictionary<string, string> filters = new Dictionary<string, string>() 
{
    {"NotFiltered",  "and submissionid not in (select id from Table2 where status='Done')"},
    {"Filtered", " and status <> 'Pending'"}
}

然后：

string selectqry = "select * from Table1 where datereceived is null ";
selectqry += filters[sortOrder];

尽管如此，为什么过滤器称为排序顺序？

更好的是，我完全放弃了sql字符串，并设置了dbContext（假设实体框架），并做了更多类似的事情：

 var results = dbContext.Table1;
if (sortOrder == "NotFiltered")
{
    results.where(x => !dbContext.Table2.Select(s => s.Id).Contains(x.Id);
}
else
{
    results.where(x => x.Status != "Pending");
}
return results.ToList();

按钮切换滤镜问题。 MVC

1 个答案: