C#通用列表 如何获得T的类型?[重复]
我正在做一个反思项目,现在被困了。
如果我有一个myclass
可以容纳的对象,那么List<SomeClass>
如果该属性myclass.SomList
为空,有人知道如何按下面的代码获取类型吗?
List<myclass> myList = dataGenerator.getMyClasses();lbxObjects.ItemsSource = myList;
lbxObjects.SelectionChanged += lbxObjects_SelectionChanged;
private void lbxObjects_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Reflect();
}
Private void Reflect()
{
foreach (PropertyInfo pi in lbxObjects.SelectedItem.GetType().GetProperties())
{
switch (pi.PropertyType.Name.ToLower())
{
case "list`1":
{
// This works if the List<T> contains one or more elements.
Type tTemp = GetGenericType(pi.GetValue(lbxObjects.SelectedItem, null));
// but how is it possible to get the Type if the value is null?
// I need to be able to create a new object of the type the generic list expect.
// Type type = pi.getType?? // how to get the Type of the class inside List<T>?
break;
}
}
}
}
private Type GetGenericType(object obj)
{
if (obj != null)
{
Type t = obj.GetType();
if (t.IsGenericType)
{
Type[] at = t.GetGenericArguments();
t = at.First<Type>();
}
return t;
}
else
{
return null;
}
}
回答:
Type type = pi.PropertyType;
if(type.IsGenericType && type.GetGenericTypeDefinition()
== typeof(List<>))
{
Type itemType = type.GetGenericArguments()[0]; // use this…
}
通常,要支持any IList<T>
,您需要检查接口:
foreach (Type interfaceType in type.GetInterfaces()){
if (interfaceType.IsGenericType &&
interfaceType.GetGenericTypeDefinition()
== typeof(IList<>))
{
Type itemType = type.GetGenericArguments()[0];
// do something...
break;
}
}
以上是 C#通用列表 如何获得T的类型?[重复] 的全部内容, 来源链接: utcz.com/qa/411040.html