将绑定列表转换为泛型列表
本文关键字:列表 泛型 绑定 转换 | 更新日期: 2023-09-27 18:35:05
我需要将绑定(UnityEngine.Component)列表转换为通用(T)列表,这可能吗
? 怎么?我正在使用 Unity 和 C#,但我想知道一般如何做到这一点。
List<Component> compList = new List<Component>();
foreach(GameObject obj in objects) // objects is List<GameObject>
{
var retrievedComp = obj.GetComponent(typeof(T));
if(retrievedComp != null)
compList.Add(retrievedComp);
}
List<T> newList = new List<T>(compList as IEnumerable<T>); // ERROR HERE
foreach(T n in newList)
Debug.Log(n);
谢谢!
我认为这就是问题所在,我收到此运行时错误...
ArgumentNullException: Argument cannot be null.
Parameter name: collection
System.Collections.Generic.List`1[TestPopulateClass].CheckCollection (IEnumerable`1 collection)
System.Collections.Generic.List`1[TestPopulateClass]..ctor (IEnumerable`1 collection)
DoPopulate.AddObjectsToList[TestPopulate] (System.Reflection.FieldInfo target) (at Assets/Editor/ListPopulate/DoPopulate.cs:201)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters)
DoPopulate.OnGUI () (at Assets/Editor/ListPopulate/DoPopulate.cs:150)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
你试过吗
List<T> newList = compList.OfType<T>().Select(x=>x).ToList()
最像的情况是 T 和组件是不同的类型:List<Component> compList
和 compList as IEnumerable<T>
(这个将为空,因为 compList IEnumerable<Component>
不是 IEnumerable<T>
)。
我想你想要:
List<T> compList = new List<T>(); // +++ T instead of GameObject
foreach(GameObject obj in objects) // objects is List<GameObject>
{
// ++++ explict cast to T if GetComponent does not return T
var retrievedComp = (T)obj.GetComponent(typeof(T));
if(retrievedComp != null)
compList.Add(retrievedComp);
}
List<T> newList = new List<T>(compList as IEnumerable<T>); // ERROR HERE
foreach(T n in newList)
Debug.Log(n);