Linq 按布尔值排序 [英] Linq order by boolean

问题描述

我有一个 linq 查询，我想按 f.bar(一个字符串)排序，但我也想先按 f.foo(一个布尔字段)排序.喜欢下面的查询.

I've got a linq query that I want to order by f.bar, which is a string, but I also want to order it by f.foo, which is a boolean field, first. Like the query below.

(from f in foo
orderby f.foo, f.bar
select f)

尽管这可以编译，但它并没有按预期工作.它只是通过 f.bar 进行排序，忽略布尔字段.

Although this compiles it doesn't work as expected. It just orders by f.bar ignoring the boolean field.

我知道我很愚蠢，但我需要做什么才能获得这种行为?

I'm being daft I know, but what do I need to do to get this behaviour?

谢谢

推荐答案

这应该可以正常工作 - 它应该首先对具有 false foo 值的实体进行排序，然后是那些具有 true foo 值.

That should work fine - it should order the entities with a false foo value first, then those with a true foo value.

这当然适用于 LINQ to Objects - 您实际使用的是哪个 LINQ 提供程序?

That certainly works in LINQ to Objects - which LINQ provider are you actually using?

这是一个确实有效的 LINQ to Objects 示例:

Here's a LINQ to Objects example which does work:

using System;
using System.Linq;

public static class Test
{
    public static void Main()
    {
        var data = new[]
        {
            new { x = false, y = "hello" },
            new { x = true, y = "abc" },
            new { x = false, y = "def" },
            new { x = true, y = "world" }
        };

        var query = from d in data
                    orderby d.x, d.y
                    select d;

        foreach (var result in query)
        {
            Console.WriteLine(result);
        }
    }

}

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