如何通过Enum执行LINQ查询？ [英] How to perform LINQ query over Enum?

问题描述

以下是我的枚举器列表：

public enum StatusEnum
{
    Open = 1,
    Rejected = 2,
    Accepted = 3,
    Started = 4,
    Completed = 5,
    Cancelled = 6,
    Assigned = 7
}

我需要将此绑定到组合框，但是只显示一些特定状态，而忽略其余状态。

I need to bind this to a Combobox, but, only show a few specific statuses and ignore the rest.

这就是我的意思到目前为止：

public static List<Activity.StatusEnum> StatusList()
{
        IEnumerable<Activity.StatusEnum> query = Enum.GetValues(typeof(Activity.StatusEnum)).Cast<Activity.StatusEnum>()
                        .Where(x => x == Activity.StatusEnum.Open
                            || x == Activity.StatusEnum.Rejected
                            || x == Activity.StatusEnum.Accepted
                            || x == Activity.StatusEnum.Started);
        return query.ToList();
}

但是，我认为代码有点混乱，不是正确的方法将已过滤的枚举列表绑定到 Combobox 。
有人可以建议一种更强大的方法吗？

However, I feel that the code is little messy and is not a correct approach to bind filtered Enum list to a Combobox. Can anyone suggest a more robust way of doing this?

我可能需要更改选择顺序。因此，我需要一个通用的解决方案，该解决方案不仅要获取前X个状态。

I might need to change the Order of selection. So I need a generic solution which doesn't only get the first X number of statuses.

推荐答案

好吧，如果您要要硬编码应该在列表中的项目，为什么不这样做呢？

Well if you're going to hard code the items that should be in the list anyway, why not just do this:

public static List<Activity.StatusEnum> StatusList()
{
    return new List<Activity.StatusEnum>
    { 
        Activity.StatusEnum.Open, 
        Activity.StatusEnum.Rejected, 
        Activity.StatusEnum.Accepted, 
        Activity.StatusEnum.Started 
    };
}

您还可以处置 List< T> 并返回数组本身。只要您知道这些是您想要的物品，就不需要Linq。

You could also dispose of the List<T> and just return the array itself. As long as you know these are the items you want, then there's no need for Linq.

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