C# 使用 foreach 循环和 Condition 使用 LINQ/LAMBDA 更新 List<T>
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时间：2020-08-10 12:50:49 来源:igfitidea点击:
Update List<T> using foreach loop and Condition using LINQ/LAMBDA
提问by Gowtham
I want to do something like this
我想做这样的事情
foreach (var item in SeasonList)
{
if (item.Text == "ALL")
{
item.IsSelected = true;
}
}
采纳答案by Aron
foreach(var item in SeasonList.Where(x => x.Text == "ALL"))
{
item.Selected = false;
}
回答by Larry
This may work also, but in my opinion, what you did is already good.
这也可能有效，但在我看来，你所做的已经很好了。
SeasonList.ForEach(s => s.IsSelected = s.TEXT != "ALL");
Or, to match exactly initial requirements :
或者，为了完全匹配初始要求：
SeasonList.Where(s => s.TEXT == "ALL").ToList().ForEach(s => s.IsSelected = false);
回答by Rick Liddle
class Program
{
static void Main(string[] args)
{
List<ItemObject> items = new List<ItemObject>()
{
new ItemObject() { Text = "Text 1", IsSelected = true },
new ItemObject() { Text = "Text 2", IsSelected = true },
new ItemObject() { Text = "ALL", IsSelected = true }
};
items.ForEach(x => { if (x.Text == "ALL") x.IsSelected = false; });
}
}
class ItemObject
{
public string Text { get; set; }
public bool IsSelected { get; set; }
}
回答by daryal
SeasonList.ForEach(q => q.IsSelected = q.Text == "ALL" ? false : q.IsSelected)
回答by C-va
Update using index
使用索引更新
var index = SeasonList.FindIndex(x => x.Text == "ALL");
if (index > 0) SeasonList[index].IsSelected = false;
Another option
另外一个选项
foreach (var item in SeasonList.FindAll(x => x.Text == "ALL"))
{
item.IsSelected = false;
}
Note:
笔记：
Check Jon Skeet's answer LINQ is for querying - not for updating.
检查 Jon Skeet 的答案LINQ 用于查询 - 不用于更新。
