有条件的LINQ where语句？ [英] Conditional LINQ where statement?

问题描述

我有，我想增加一个额外的一个LINQ声明where子句，如果一个下拉指数不为0。

I have a linq statement that I want to add an additional where clause to if a drop down index is not 0.

people.Where(n.surname == "surname" || n.forename == "forename" && (dropdown.SelectedIndex > 0) ? n.id = dropdown.SelectedValue : n.id  > 0).Select(n => n);

我甚至不知道我想做的可能吗？

I am not even sure if what I am trying is possible??

我想做到这一点，而不是写两个不同的语句。

I would like to do this rather than having to write two different statements.

任何想法？

感谢

推荐答案

幸运的是，这很容易，因为查询组成：

Fortunately, this is easy because queries compose:

var query = people.Where(n.surname == "surname" || n.forename == "forename");
if (dropdown.SelectedIndex > 0)
{
    query = query.Where(n => n.id.ToString() == dropdown.SelectedValue);
}

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