Question

我试图使用反射获取对象的所有ObservableCollection属性。例如我有一个具有ObservableCollecton和ObservableCollection的Person类，PhoneModel和AddressModel都继承自ModelBaseclass。现在我有以下函数试图选择所有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;
}

这有效：

[TestMethod]
public void GetObservableCollections_HasOnePublicProperty_Return1()
{
    var personWithPhones = GetValidPersonAndPhonesModel();
    var collection = GetObservableCollections<PhoneModel>(personWithPhones);

    Assert.IsTrue(collection.Count()==1);
}

我希望这可以工作，例如找不到特定型号但是找不到ModelBase，例如我想要所有ObservableCollectionProperties都用于地址和电话

[TestMethod]
public void GetObservableCollections_HasOnePublicProperty_Return1()
{
    var personWithPhones = GetValidPersonAndPhonesModel();
    var collection = GetObservableCollections<ModelBase>(personWithPhones);

    Assert.IsTrue(collection.Count()==2);
}

上述内容不会返回任何内容。

有什么建议吗？

===＆GT;这是彼得建议之后的更新代码，但有一些投射错误：

            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;
}

Answer 1

您可以查找未关闭的类型的ObservableCollection<>，而不是查看已关闭的泛型类型。像这样：

var unclosedTyped = prop.PropertyType.GetGenericTypeDefinition();
if (unclosedTyped == typeof(ObservableCollection<>))
{
    // you have an ObservableCollection<> property
}

进一步检查集合元素类型：

var elementType = prop.PropertyType.GetGenericArguments().First();
if (typeof(ModelBase).IsAssignableFrom(elementType))
{
   // you have indeed an ObservableCollection property 
   // with elements that inherit `ModelBase`
}

根据基类型</t>获取对象的所有ObservableCollection <t>属性

1 个答案: