获取所有可观测集合<;T>;基于基类型的对象的属性
本文关键字:于基 类型 属性 对象 gt 集合 lt 获取 可观 | 更新日期: 2023-09-27 18:30:00
我正在尝试使用反射获取对象的所有ObservableCollection属性。例如,我有一个Person类,它有ObservableCollecton和ObservableCollection,PhoneModel和AddressModel都继承自ModelBaseclass。现在,我有了下面的函数,它试图选择所有的ObservableCollection属性。
/// <summary>
/// Get all the oversablecollection properties from the object
/// </summary>
/// <typeparam name="T">type to search for</typeparam>
/// <param name="model">object to return properties for</param>
public IList<ObservableCollection<T>> GetObservableCollections<T>(object model)
{
var type = model.GetType();
var result = new List<ObservableCollection<T>>();
foreach (var prop in type.GetProperties())
{
if (prop.PropertyType.IsAssignableFrom(typeof(ObservableCollection<T>)))
{
var get = prop.GetGetMethod();
if (!get.IsStatic && get.GetParameters().Length == 0) // skip indexed & static
{
var collection = (ObservableCollection<T>)get.Invoke(model, null);
if (collection != null)
result.Add(collection);
}
}
}
return result;
}
这项工作:
[TestMethod]
public void GetObservableCollections_HasOnePublicProperty_Return1()
{
var personWithPhones = GetValidPersonAndPhonesModel();
var collection = GetObservableCollections<PhoneModel>(personWithPhones);
Assert.IsTrue(collection.Count()==1);
}
我希望它能工作,例如,不是为特定的模型,而是为ModelBase查找,例如,我想要地址和电话的所有ObservableCollectionProperties
[TestMethod]
public void GetObservableCollections_HasOnePublicProperty_Return1()
{
var personWithPhones = GetValidPersonAndPhonesModel();
var collection = GetObservableCollections<ModelBase>(personWithPhones);
Assert.IsTrue(collection.Count()==2);
}
以上内容没有返回任何内容。
有什么建议吗?
===>这是根据Peter的建议更新的代码,但有一些铸造错误:
public static IList<ObservableCollection<T>> GetObservableCollections<T>(object obj)
{
var type = obj.GetType();
IList<object> list = new List<object>();
IList<ObservableCollection<T>> result = new List<ObservableCollection<T>>();
foreach (var prop in type.GetProperties().Where(p=> p.PropertyType.IsGenericType))
{
var unclosedTyped = prop.PropertyType.GetGenericTypeDefinition();
if (unclosedTyped == typeof(ObservableCollection<>))
{
// you have an ObservableCollection<> property
var elementType = prop.PropertyType.GetGenericArguments().First();
if (typeof(ModelBase).IsAssignableFrom(elementType))
{
// you have indeed an ObservableCollection property
// with elements that inherit `ModelBase`
var get = prop.GetGetMethod();
if (!get.IsStatic && get.GetParameters().Length == 0) // skip indexed & static
{
var collection = get.Invoke(obj, null);
if (collection != null)
{
//list.Add(collection); // This works
result.Add((ObservableCollection<T>) collection);
}
}
}
}
}
return list;
}
您可以查找ObservableCollection<>
的未闭合类型,而不是查看已关闭泛型类型。类似这样的东西:
var unclosedTyped = prop.PropertyType.GetGenericTypeDefinition();
if (unclosedTyped == typeof(ObservableCollection<>))
{
// you have an ObservableCollection<> property
}
要进一步检查采集元件类型:
var elementType = prop.PropertyType.GetGenericArguments().First();
if (typeof(ModelBase).IsAssignableFrom(elementType))
{
// you have indeed an ObservableCollection property
// with elements that inherit `ModelBase`
}