在 where 子句中使用 where 子句的 Linq 查询导致错误

Question

var largeset =
        from inv in context.Invoices
        join line in context.InvoiceLines on inv.InvoiceId equals line.InvoiceId
        into Lines from linejoin in Lines
        join track in context.Tracks on linejoin.TrackId equals track.TrackId
        into Tracks
        select new
        {
            Invoice = inv,
            Line = Lines,
            Track = Tracks
        };

// Filter by search term
if (!string.IsNullOrEmpty(SearchTerm))
{
    largeset = largeset.Where(x =>
            x.Invoice.Customer.LastName.StartsWith(SearchTerm) ||
            x.Invoice.Customer.FirstName.StartsWith(SearchTerm) ||
            x.Track.Where(t => t.Name.Contains(SearchTerm)).Count > 0);
}

这段代码的最后一行

x.Track.Where(t => t.Name.Contains(SearchTerm)).Count > 0

导致错误

Error CS0019 Operator '>' cannot be applied to operands of type 'method group' and 'int'

提前致谢。

Answer 1

https://msdn.microsoft.com/en-us/library/bb338038(v=vs.100).aspx

您需要使用 Count() 调用方法 Count，而不是像属性.

那样仅仅引用成员名称

在 where 子句中使用 where 子句的 Linq 查询导致错误

Linq query with where clause within a where clause causes an error

c#

linq

linq-to-entities

entity-framework