是否可以使用匿名类型的条件字段 [英] is it possible to have a conditional field in an anonymous type

问题描述

我有一些看起来像这样的代码，并根据现有集合创建了一个列表

i have some code that looks like this and creates a list from an existing collection

 var items = items.ConvertAll(r => new
            {
                description = FormatDescription(r),
                start = r.Milestone.HasValue ? r.Milestone.Value.ToString("yyyy-MM-ddTHH:mm:ssZ") : DateTime.Today.ToString("yyyy-MM-ddTHH:mm:ssZ"),
                classname = "significance" + r.SignificanceLevel,

如您所见，现在，如果我没有开始日期(里程碑)，那么我会输入今天的日期.我真正想做的是:

As you can see, right now if i dont have a start date (r.Milestone) then i put in today's date. What i really want to do if say:

1. 如果我有r.Milestone.Hasvalue，则显示该日期；如果我没有值，则完全没有匿名类型的START DATE字段.

是否可能有这种条件逻辑，您可以在其中删除所有类型的代码?

Is it possible to have this conditional logic where you can remove the field all together inside this type of code?

推荐答案

不，您不能这样做，主要是因为这会使匿名类在不同的执行方式中有所不同，并且无法对该类型进行类型检查.

No, you can't, mostly since it would make the anonymous class different in different executions and the class couldn't be type checked.

我建议将开始日期设置为null而不是默认值，并在代码中稍后进行检查.

I'd recommend setting your Start date to null instead of a default, and checking for that later in your code.

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