无法将 GetTypes() 转换为接口
我正在扫描特定命名空间以查找实现接口的类型，并尝试将它们作为该接口而不只是类型返回，但我收到了 InvalidCastException
IEnumerable<IGameScript> GetDemos()
{
var results = Assembly.GetExecutingAssembly().GetTypes()
.Where(
x => x.IsClass
&& x.Namespace == "MMOClass.CodeBase.Demos"
&& x.Name.Contains("Demo")
&& x.GetInterfaces().Contains(typeof(IGameScript))
).Select(x => x);
return results.Cast<IGameScript>();
}
更新以响应 Reed 的回答：
IEnumerable<IGameScript> GetDemos()
{
var results = Assembly.GetExecutingAssembly().GetTypes()
.Where(
x => x.IsClass
&& x.Namespace == "MMOClass.CodeBase.Demos"
&& x.Name.Contains("Demo")
&& x.GetInterfaces().Contains(typeof(IGameScript))
).Select(x => Activator.CreateInstance(x) as IGameScript);
return results;
}
I'm scanning a particular namespace for types that implement an interface, and trying to return them as that interface rather than just Type, but i'm getting an InvalidCastException
IEnumerable<IGameScript> GetDemos()
{
var results = Assembly.GetExecutingAssembly().GetTypes()
.Where(
x => x.IsClass
&& x.Namespace == "MMOClass.CodeBase.Demos"
&& x.Name.Contains("Demo")
&& x.GetInterfaces().Contains(typeof(IGameScript))
).Select(x => x);
return results.Cast<IGameScript>();
}
Update in response to Reed's answer:
IEnumerable<IGameScript> GetDemos()
{
var results = Assembly.GetExecutingAssembly().GetTypes()
.Where(
x => x.IsClass
&& x.Namespace == "MMOClass.CodeBase.Demos"
&& x.Name.Contains("Demo")
&& x.GetInterfaces().Contains(typeof(IGameScript))
).Select(x => Activator.CreateInstance(x) as IGameScript);
return results;
}
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您的 LINQ 查询返回实现接口的类型 (
IEnumerable) 集合，而不是该类型的对象集合。但是，您尝试返回一个
IEnumerable，它是实现该接口的对象的实例列表。您需要构造实例才能转换为接口本身。Your LINQ query returns a collection of Types (
IEnumerable<System.Type>) which implement the interface, not a collection of objects of that type.However, you're trying to return an
IEnumerable<IGameScript>, which would be a list of instances of objects that implement that interface. You'll need to construct instances in order to cast to the interface itself.假设您有默认构造函数，您可以简单地将 Select LINQ 调用改造成类似这样的内容，并实际获取该类型的实例：
Assuming you have default constructors, you can simple reform your Select LINQ call to something like this and actually get the instances of that type: