How to call Method of Private Property using Reflection in c#?

Question

I have some problems with my project.

I want to call one method from private Property like private clsBUS_DEMO prop_DEMO

clsBUS_DEMO has a Method, which Name is public void SayHello().

This is my code

PropertyInfo p = this.GetType().GetProperty("SayHello");

p is null because program can't find prop_DEMO

Can anybody help me about this?

SayHello() isn't a property, it's a method. The property that you are after is prop_DEMO, which will return a clsBUS_DEMO instance, and you can call SayHello() on that — LordWilmore, Jul 04 '16 at 08:34
Yes, it's Method. Now i have like this `PropertyInfo p = this.GetType().GetProperty("prop_DEMO");` `MethodInfo method = p.GetType().GetMethod("SayHello");` — Trương Long, Jul 04 '16 at 09:10
Just to confirm, you're making this call from a method within the clsBUS_DEMO class? — LordWilmore, Jul 04 '16 at 09:19
GetProperty() defaults to only returning public properties, so you need to change your call to this.GetType.GetProperty("prop_DEMO", BindingFlags.NonPublic | BindingFlags.Instance ). — LordWilmore, Jul 04 '16 at 09:25
@TrươngLong can you write code for clsBUS_DEMO class and the class that is property is used in? — Kahbazi, Jul 04 '16 at 09:26
@Arvin I take a photo use my language https://drive.google.com/folderview?id=0BxrNWDKN5N6rWHVMQmdJZDBMcWc&usp=sharing — Trương Long, Jul 04 '16 at 09:39

user1845593 · Answer 1 · 2016-07-04T10:17:41.513

Call a method of private property? Not sure if I understood what you want, it would be useful to have the class that represent you object. Do you mean call a property that returns an object and then call a method of that object?

Anyways, I think there's a lot information out there about that topic, for example: How do I use reflection to invoke a private method? Find a private field with Reflection?

class MyClass1
{
    public MyClass1()
    {
        Prop = new MyClass2();
    }

    public MyClass2 Prop { get; set; } 
}

class MyClass2
{
    private int Test()
    {
        return 5;
    }
}

static void Main(string[] args)
{
    var obj = new MyClass1();
    var obj2 = obj.Prop;

    var propInfo = obj.GetType().GetProperty("Prop");

    var obj2Reflection = propInfo.GetValue(obj, null);
    var dynMethod = obj2.GetType().GetMethod("Test", BindingFlags.NonPublic | BindingFlags.Instance);
    var obj2Return = dynMethod.Invoke(obj2, null);
}

Yes, i wanna do that. I'm search in google and stack but i can't find how to fix this because when i'm get property. It's just return null. Thank you for your link. — Trương Long, Jul 04 '16 at 09:17

score 0 · Accepted Answer · answered Jul 04 '16 at 09:51

clsBUS_DEMO prop_DEMO is not a property, it's a Field. You need to use GetFields to get it and also since it's private you need to pass BindingFlags.NonPublic and BindingFlags.Instance.

Here is a sample of how you should do it

 static void Main(string[] args)
    {
        Bar bar = new Bar();
        Foo foo = (Foo)bar.GetType().GetField("a", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance).GetValue(bar);
        foo.GetType().GetMethod("ShowMessage").Invoke(foo,new object[] { });
    }
    public class Bar
    {
        private Foo a;
        public Bar()
        {
            a = new Foo();
        }
    }
    public class Foo
    {
        public void ShowMessage()
        {
            Console.WriteLine("Hello World!");
        }
    }

score 0 · Answer 3 · answered Jul 04 '16 at 09:53

0

Okay guys!

I'm done :)

I just Create Property get{} set{} and use this code :D

PropertyInfo p = this.GetType().GetProperty("LoaiSP_BUS", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);

Thanks all!

answered Jul 04 '16 at 09:53

Trương Long

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How to call Method of Private Property using Reflection in c#?

3 Answers3