确定属性类型是否为泛型类型参数

Question

Say you have the class:

public class GenericModel<T1, T2>
{
    public T1 Model1 { get; set; }
    public T2 Model2 { get; set; }
}

How can you tell using reflection that the type of Model1 is generic argument T1 and the type of Model2 is generic argument T2?

I'm looking for a property or something that will tell me that Model1's type maps to typeof(GenericModel<,>).GetGenericArguments()[0]

Answer 1

Simple:

var model1Type = typeof(GenericModel<,>).GetProperty("Model1").PropertyType;
var model2Type = typeof(GenericModel<,>).GetProperty("Model2").PropertyType;

Then the values of model1Type.IsGenericParameter & model2Type.IsGenericParameter will both be true indicating that you've got the generic parameter type for the properties.

Also, model1Type.Name == "T1" & model2Type.Name == "T2" .

---

If you have a specific instance, such as var instance = new GenericModel<int, int>(); , then you can do this to get the generic name of a property out:

var instanceModel1TypeName =
    instance
        .GetType()
        .GetGenericTypeDefinition()
        .GetProperty("Model1")
        .PropertyType
        .Name;

// instanceModel1TypeName == "T1"