遍历列表列表? [英] Iterating through a list of lists?

问题描述

我有来自某个来源的物品(从其他地方填充):

I have Items from a certain source (populated from somewhere else):

public class ItemsFromSource{
    public ItemsFromSource(string name){
        this.SourceName = name;
        Items = new List<IItem>();
    }

    public string SourceName;
    public List<IItem> Items;
}

现在在 MyClass 中，我有来自多个来源的项目(从其他地方填充):

Now in MyClass I have Items from several sources (populated from somewhere else):

public class MyClass{
    public MyClass(){
    }

    public List<ItemsFromSource> BunchOfItems;
}

有没有一种简单的方法可以一次性遍历 BunchOfItems 中所有 ItemsFromSources 中的所有 Item?即，类似于:

Is there a simple way to iterate through all Items in all ItemsFromSources in BunchOfItems in one go? i.e., something like:

foreach(IItem i in BunchOfItems.AllItems()){
    // do something with i
}

而不是做

foreach(ItemsFromSource ifs in BunchOffItems){
    foreach(IItem i in ifs){
        //do something with i
    }
}

推荐答案

好吧，你可以使用 linq 函数 SelectMany 来flatmap(创建子列表并将它们压缩为一个)值:

Well, you can use the linq function SelectMany to flatmap (create child lists and compress them into one) the values:

foreach(var i in BunchOfItems.SelectMany(k => k.Items)) {}

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