Question

我对使用decimal数据类型的搜索有疑问。我在表中有十进制数据类型，我必须在网格视图中调用，因为它的现有数据库和我没有权限更改数据库中的任何内容。我正在关注此链接 search decimal values in Linq query但是没有用。请告知我在哪里做错了。

这是我的观点

    @using (Html.BeginForm("Index", "Incident", FormMethod.Post, new { id = 
    "SearchForm" }))
    {
    <button class="glyphicon glyphicon-search" style="width: 50px; height: 
    50px;"></button>
    <input type="text" name="keyword" placeholder="Search..." 
   value="@Session["Search_Keyword"]" />
    <br />
    <br />
    @Html.Grid(Model).Named("ITSMSearchGrid").Columns(x =>
    {
        x.Add(y => y.IncidentNumber).Titled("Incident Number");
        x.Add(y => y.CreatedBy).Titled("Network Login");
        x.Add(y => y.ProfileFullName).Titled("Full Name");
        x.Add(y => y.Site);
        x.Add(y => y.Subject);
        x.Add(y => y.Service);
        x.Add(y => y.OwnerTeam).Titled("Team Owner");
        x.Add().Encoded(false)
            .Sanitized(false)
            .SetWidth(20)
            .RenderValueAs(y => Html.ActionLink(" Details", "Details", new { id = y.RecId }, new { @class = "btn btn-primary fa fa-chevron-circle-down" }));
    }).WithPaging(50).Sortable(true)
}

这是我的控制器

    public ActionResult Index(string keyword)
    {
        List<Incident> incidentList = _context.Incidents.Where(x => 
    x.TypeOfIncident == "Incident").ToList();
        decimal dec;
        bool IsDecimal = decimal.TryParse(keyword, out dec);

        // Truncating search to 2 digits this should be equal to your db            
        // column precision so that rounding case are handled properly 
        decimal TruncateDigits = -1;
        if (IsDecimal)
            TruncateDigits = Convert.ToDecimal(Math.Truncate(dec * 100) / 100);
        if (keyword == null)
        {
            if (Session["Search_Keyword"] != null)
            {
                keyword = (string) Session["Search_Keyword"];
            }
            else
            {
                return View(incidentList.OrderBy(x => x.IncidentNumber).ThenBy(x => x.CreatedBy).ToList());
            }
        }
        else
        {
            Session["Search_Keyword"] = keyword;
        }
        return View((keyword == ""
            ? incidentList
            : incidentList.Where(x =>
            SqlFunctions.StringConvert(x.IncidentNumber).Contains(keyword.ToUpper())||
                x.CreatedBy.ToUpper().Contains(keyword.ToUpper())
               ).ToList()).OrderBy(x => x.IncidentNumber).ToList());
        // return View(incidentList);
    }

这就是我的错误“System.NotSupportedException：只能从LINQ to Entities调用此函数。”

Answer 1

错误消息非常清楚，您正在尝试在内存列表中调用SQL函数。将您的代码更改为：

if (!string.IsNullOrEmpty(keyword))
{
    incidentList = incidentList
        .Where(x => x.IncidentNumber.ToString().Contains(keyword.ToUpper())
                 || x.CreatedBy.ToUpper().Contains(keyword.ToUpper())
        .OrderBy(x => x.IncidentNumber)
        .ToList();
}

return View(incidentList);

请注意，我在.ToList()来电之前删除了.OrderBy只是在浪费资源。

在搜索功能中，使用mvc中的十进制数据类型进行搜索

1 个答案: