C# - var 到 List<T> 的转换
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C# - var to List<T> conversion
提问by user366312
How to cast/convert a var type to a List type?
如何将 var 类型转换/转换为 List 类型？
This code snippet is giving me error:
这段代码片段给了我错误：
List<Student> studentCollection = Student.Get();
var selected = from s in studentCollection
select s;
List<Student> selectedCollection = (List<Student>)selected;
foreach (Student s in selectedCollection)
{
s.Show();
}
回答by CMS
When you do the Linq to Objects query, it will return you the type IEnumerable<Student>, you can use the ToList()method to create a List<T>from an IEnumerable<T>:
当您执行 Linq to Objects 查询时，它会返回类型IEnumerable<Student>，您可以使用该ToList()方法List<T>从 an创建一个IEnumerable<T>：
var selected = from s in studentCollection
select s;
List<Student> selectedCollection = selected.ToList();
回答by adrianbanks
The varin your sample code is actually typed as IEnumerable<Student>. If all you are doing is enumerating it, there is no need to convert it to a list:
在var您的示例代码实际上是类型为IEnumerable<Student>。如果您所做的只是枚举它，则无需将其转换为列表：
var selected = from s in studentCollection select s;
foreach (Student s in selected)
{
s.Show();
}
If you do need it as a list, the ToList()method from Linq will convert it to one for you.
如果您确实需要将其作为列表，Linq的ToList()方法会为您将其转换为列表。
回答by Michael G
You can call the ToList LINQ extension Method
可以调用 ToList LINQ 扩展方法
List<Student> selectedCollection = selected.ToList<Student>();
foreach (Student s in selectedCollection)
{
s.Show();
}
回答by JaredPar
Try the following
尝试以下
List<Student> selectedCollection = selected.ToList();
