我需要知道类中属性的类型是否是使用PropertyInfo类的泛型集合(List,ObservableCollection)。
foreach (PropertyInfo p in (o.GetType()).GetProperties())
{
if(p is Collection<T> ????? )
}
答案 0 :(得分:31)
Type tColl = typeof(ICollection<>);
foreach (PropertyInfo p in (o.GetType()).GetProperties()) {
Type t = p.PropertyType;
if (t.IsGenericType && tColl.IsAssignableFrom(t.GetGenericTypeDefinition()) ||
t.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == tColl)) {
Console.WriteLine(p.Name + " IS an ICollection<>");
} else {
Console.WriteLine(p.Name + " is NOT an ICollection<>");
}
}
您需要测试t.IsGenericType
和x.IsGenericType
,否则如果类型不是通用的,GetGenericTypeDefinition()
将抛出异常。
如果属性声明为ICollection<T>
,则tColl.IsAssignableFrom(t.GetGenericTypeDefinition())
将返回true
。
如果属性声明为实现ICollection<T>
的类型,那么
t.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == tColl)
将返回true
。
请注意,tColl.IsAssignableFrom(t.GetGenericTypeDefinition())
会为false
返回List<int>
。
我已为MyT o = new MyT();
private interface IMyCollInterface1 : ICollection<int> { }
private interface IMyCollInterface2<T> : ICollection<T> { }
private class MyCollType1 : IMyCollInterface1 { ... }
private class MyCollType2 : IMyCollInterface2<int> { ... }
private class MyCollType3<T> : IMyCollInterface2<T> { ... }
private class MyT
{
public ICollection<int> IntCollection { get; set; }
public List<int> IntList { get; set; }
public IMyCollInterface1 iColl1 { get; set; }
public IMyCollInterface2<int> iColl2 { get; set; }
public MyCollType1 Coll1 { get; set; }
public MyCollType2 Coll2 { get; set; }
public MyCollType3<int> Coll3 { get; set; }
public string StringProp { get; set; }
}
输出:
IntCollection IS an ICollection<>
IntList IS an ICollection<>
iColl1 IS an ICollection<>
iColl2 IS an ICollection<>
Coll1 IS an ICollection<>
Coll2 IS an ICollection<>
Coll3 IS an ICollection<>
StringProp is NOT an ICollection<>
答案 1 :(得分:11)
GetGenericTypeDefinition
和typeof(Collection<>)
将完成这项工作:
if(p.PropertyType.IsGenericType && typeof(Collection<>).IsAssignableFrom(p.PropertyType.GetGenericTypeDefinition())