如何在LInq中编写简单代码

Question

我在NotSelectedList中有以下内容。

public List<TestModel> SelectedList = new List<TestModel>(); 
public List<TestModel>NotSelectedList = new List<TestModel>(); 
NotificationDetailsModel projects = new NotificationDetailsModel(); 
projects.ProjectID = Convert.ToInt32(Row["ProjectID"]); 
projects.Valid= Convert.ToBoolean(Row["Validity"]); 
NotSelectedList.Add(projects); 

我如何写一个简单的代码在LINQ从NotSelectedList选择在那里效力==真与存储在SelectedList的数据？

Answer 1

试试这个：

var results = NotSelectedList.Where(x => x.Valid); 
foreach (var item in results) 
    SelectList.Add(item); 

虽然性能方面的原因，你可能会更好做这样的事情：

foreach (var item in NotSelectedList) 
{ 
    if (item.Valid) 
     SelectList.Add(item); 
} 

Answer 2

var query = from ns in NotSelectedList 
      from n in SelectedList 
      where ns.Valid && ns.ProjectID == n.ProjectID 
      select ns; 

希望这将帮助你

Answer 3

下将从NotSelectedList中选择Validity = true的项目并将它们放入SelectedList中：

SelectedList.AddRange(NotSelectedList.Where(item => item.Validity));