LINQ with conditional where子句

Question

我有这个LINQ:

    private static IQueryable<Contract> getValidContracts(DbContext context, DateTime date,int clientId)
    {
        return (from contract in context.Set<Contract>()
                where contract.ValidityDate >= date
                where contract.ClientId == clientId
                select contract);
    }

在LINQ我给了这一行:

 where contract.ClientId == clientId

我希望只有当clientId变量不等于零时,此行才会包含在where子句中.

任何想法我怎么能优雅呢？

Answer 1

只需在其中添加0的检查

where ((contract.ClientId == clientId && clientId != 0) || clientId == 0)