派生类型列表上的 Linq 表达式
我正在尝试编写一个 Linq 表达式来检查派生类中的属性，但该列表由基类中的成员组成。下面的示例代码。以“var list”开头的 Process 方法的第二行无法编译，但我不确定应该使用什么语法来使其有效？
public class Manager
{
public void Process()
{
Base[] stuff = { new Derived() { Id = "1", Name = "me" } };
var list = stuff.Where<Derived>(d => d.Name == "me");
}
}
public class Base
{
public string Id { get; set; }
}
public class Derived : Base
{
public string Name { get; set; }
}
I am trying to write a Linq expression that checks against property in a derived class, but the list is made up of members from a base class. Example code below. The 2nd line of the Process method starting with 'var list' does not compile, but I am not sure what syntax I should use to make it valid?
public class Manager
{
public void Process()
{
Base[] stuff = { new Derived() { Id = "1", Name = "me" } };
var list = stuff.Where<Derived>(d => d.Name == "me");
}
}
public class Base
{
public string Id { get; set; }
}
public class Derived : Base
{
public string Name { get; set; }
}
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如果您知道列表只有
Derived，则可以使用Cast方法：如果只有 some
Derived< /code>，您可以使用OfType：在这种情况下，非
Derived对象将被跳过。If you know the list has only
Derived, you can use theCast<T>method:If there are only some
Derived, you can useOfType<T>:In that case, the non-
Derivedobjects will be skipped.