is a property an object, list and inherit from x class

Question

User1034446946 posted

Hi

I am looping through the properties of an object and need to find out is the property is an class or multiple classes (enumerable, collection or list) and inherit a class of x and i am a little stuck, any help would be appriciated.

Answer 1

User475983607 posted

I am looping through the properties of an object and need to find out is the property is an class or multiple classes (enumerable, collection or list) and inherit a class of x and i am a little stuck, any help would be appriciated.

I think you are looking for an extension method.  

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/how-to-implement-and-call-a-custom-extension-method

Answer 2

User-474980206 posted

you use the is operator:

  https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/is

also as core supports c# 8, you can use the new pattern matching:

   https://docs.microsoft.com/en-us/dotnet/csharp/pattern-matching

Answer 3

User1034446946 posted

thanks for the replie, sorry rushed the op. have tried to us is but I am looping through the properties

foreach(var prop in GetType().GetProperties())
{

}
    

do i have to check if its all enumerable and collection and List, or is there one i can check for them all?

can i use

if (prop == typeof(MyInheitedClassName))
{

}

Answer 4

User711641945 posted

Hi EnenDaveyBoy,

Here is a working demo like below:

1.Model:

public class Base
{
    public int Id { get; set; }
}
public class Test:Base
{
    public Test2 Test2 { get; set; }
    public List<Test2> Tests { get; set; }
}
public class Test2
{
    public string Data { get; set; }
}

2.Test:

public void Testmethod()
{
    var obj = new Test();
    foreach (var property in obj.GetType().GetProperties())
    {

        //for complex types
        if (property.PropertyType.IsClass&&!typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
        {
            Console.WriteLine("{0} is a class", property);
        }
        if(typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
        {
            Console.WriteLine("{0} is List class", property);
        }
        //if it is a subclass
        if(typeof(Test).IsSubclassOf(typeof(Base)))
        {
            Console.WriteLine("{0} is inherits from Base", property);
        }              
    }
}

Reference:

https://stackoverflow.com/a/8699063/11398810

https://stackoverflow.com/a/37844503/11398810

Best Regards,

Rena

Answer 5

User1034446946 posted

thanks for the info, really helped, only bit i changed for my own future reference.

if(property.PropertyType.IsSubclassOf(typeof(Base)))