无法隐式转换类型'System.Collections.Generic.IEnumerable [英] Cannot implicitly convert type 'System.Collections.Generic.IEnumerable
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问题描述
我需要使用(Where(x=>x.IsMallExternal == false))
过滤ObservableCollection.
I need to filter a ObservableCollection with a(Where(x=>x.IsMallExternal == false))
.
使用此代码:
ObservableCollection<Shop> test = allShopsForCat.Where(x => x.IsMallExternal == false);
我收到此错误:
Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<DataModel.Shop>' to 'System.Collections.ObjectModel.ObservableCollection<DataModel.Shop>'.
所以我改用此代码作为解决方案,但似乎不是最好的方法.
So I am using this code as a solution instead, but seems not the best way.
- 我想知道如何在我的方法中使用
.Where
过滤ObservableCollection.
- I would like to know how to filter ObservableCollection with
.Where
in my method.
public ObservableCollection<Shop> Shops
{
get
{
ObservableCollection<Shop> allShopsForCat = App._dataSource.GetShopsForCategoryAll(_id);
//ObservableCollection<Shop> test = allShopsForCat.Where(x => x.IsMallExternal == false); // THIS DOES NOT WORK
ObservableCollection<Shop> shopsNotExternal = new ObservableCollection<Shop>();
// Get only shops for category which are internal to mall
foreach (var shop in allShopsForCat)
{
if (shop.IsMallExternal == false)
{
shopsNotExternal.Add(shop);
}
}
return shopsNotExternal;
}
}
推荐答案
所有linq查询都返回IEnumerable(或某些派生的变体,例如IOrderedEnumerable),因此您只需要将其转换为列表即可.
All linq queries return IEnumerable (or some derived variant such as IOrderedEnumerable), so you just need to convert it to list
var filtered = allShopsForCat.Where(x => x.IsMallExternal == false);
ObservableCollection<Shop> shopsNotExternal = new ObservableCollection<Shop>(filtered);
更新
这项工作正常:
List<int> temp = new List<int> { 1, 3, 5, 5, 6, 7, 7, 8 };
var filtered = temp.Where(i => i == 5 || i == 7);
ObservableCollection<int> l = new ObservableCollection<int>(filtered);
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