removeall过的ObservableCollections？

问题描述

我要寻找的Linq的方式（如RemoveAll方法的列表），它可以删除选定的从我的ObservableCollection项目。

I am looking for Linq way (like RemoveAll method for List) which can remove selected items from my ObservableCollection.

我太新创建的扩展方法我。有什么办法，我从的ObservableCollection删除项目传递一个Lambda表达式？

I am too new to create an extension method for myself. Is there any way I remove items from ObservableCollection passing a Lambda expression?

推荐答案

我不知道的方式只有删除选择的项目。但是创建一个扩展方法是直截了当：

I am not aware of a way to remove only the selected items. But creating an extension method is straight forward:

public static class ExtensionMethods
{
    public static int Remove<T>(
        this ObservableCollection<T> coll, Func<T, bool> condition)
    {
        var itemsToRemove = coll.Where(condition).ToList();

        foreach (var itemToRemove in itemsToRemove)
        {
            coll.Remove(itemToRemove);
        }

        return itemsToRemove.Count;
    }
}

这将删除的ObservableCollection 符合条件。你可以把它像：

This removes all items from the ObservableCollection that match the condition. You can call it like that:

var c = new ObservableCollection<SelectableItem>();
c.Remove(x => x.IsSelected);

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