Question

我正在尝试在客户列表上实现搜索功能，本教程在Asp.Net网站上详细介绍了该功能，

http://www.asp.net/entity-framework/tutorials/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application

在我的控制器中，我有以下

public ViewResult Index(string sortOrder, string searchString)
    {
        ViewBag.CustomerNameSortParm = String.IsNullOrEmpty(sortOrder) ? "CustomerName desc" : "";
        ViewBag.PrimaryContactNameSortParm = sortOrder == "PrimaryContactName" ? "PrimaryContactName desc" : "PrimaryContactName";
        var cust = repository.Customers;

        if (!String.IsNullOrEmpty(searchString))
        {
            cust = cust.Where(c => c.CustomerName.ToUpper().Contains(searchString.ToUpper())
                                   || c.PrimaryContactName.ToUpper().Contains(searchString.ToUpper()));
        }

        switch (sortOrder)
        {
            case "CustomerName desc":
                cust = repository.Customers.OrderByDescending(s => s.CustomerName);
                break;
            case "PrimaryContactName":
                cust = repository.Customers.OrderBy(s => s.PrimaryContactName);
                break;
            case "PrimaryContactName desc":
                cust = repository.Customers.OrderByDescending(s => s.PrimaryContactName);
                break;
            default:
                cust = repository.Customers.OrderBy(s => s.CustomerName);
                break;
        }

        return View(cust.ToList());
    }

if语句检查该值，并应使用LINQ，WHERE语句来过滤列表，

我在视图中设置了文本框，如

@using (Html.BeginForm())
{
<p>
    Find by name: @Html.TextBox("SearchString") &nbsp;
    <input type="submit" value="Search" /></p>
}

但是，当我输入客户名称时结果未被过滤，我使用的是SQL Server 2008 R2，还有其他人遇到过这个问题吗？还有其他任何东西需要让Contains方法工作吗？

建议表示赞赏？

利安

Answer 1

在排序顺序开关中，您使用repository.Customers重新设置cust变量。您应该使用cust变量来对已过滤的集合应用排序。

switch (sortOrder)
        {
            case "CustomerName desc":
                cust = cust.OrderByDescending(s => s.CustomerName);
                break;

Answer 2

当你进行搜索时，你有if语句但是仍然会在转换语句之后，尝试

    if (!String.IsNullOrEmpty(searchString))
    {
        cust = cust.Where(c => c.CustomerName.ToUpper().Contains(searchString.ToUpper())
                               || c.PrimaryContactName.ToUpper().Contains(searchString.ToUpper()));
    }
    else
    {
        switch (sortOrder)
        {
            case "CustomerName desc":
                cust = repository.Customers.OrderByDescending(s => s.CustomerName);
                break;
            case "PrimaryContactName":
                cust = repository.Customers.OrderBy(s => s.PrimaryContactName);
                break;
            case "PrimaryContactName desc":
                cust = repository.Customers.OrderByDescending(s => s.PrimaryContactName);
                break;
            default:
                cust = repository.Customers.OrderBy(s => s.CustomerName);
                break;
        }
    }

这种方式不会在设置

后重新分配

编辑：由于您在方法开头设置了cust，您也可以

    if (!String.IsNullOrEmpty(searchString))
    {
        cust = cust.Where(c => c.CustomerName.ToUpper().Contains(searchString.ToUpper())
                               || c.PrimaryContactName.ToUpper().Contains(searchString.ToUpper()));
    }

    switch (sortOrder)
    {
        case "CustomerName desc":
            cust = cust.OrderByDescending(s => s.CustomerName);
            break;
        case "PrimaryContactName":
            cust = cust.OrderBy(s => s.PrimaryContactName);
            break;
        case "PrimaryContactName desc":
            cust = cust.OrderByDescending(s => s.PrimaryContactName);
            break;
        default:
            cust = cust.OrderBy(s => s.CustomerName);
            break;
    }

仍然在不重新加载的情况下订购它

Asp.Net MVC3添加了搜索功能

2 个答案: