C＃ - GetMethod返回null

Question

I have A class:

public abstract class A
{

}

And then I have B class that derives from it:

public sealed class B : A
{
    public void SomeMethod()
    {
        var method = this.GetType().GetMethod("AddText");
    }

    private void AddText(string text)
    {
        ...
    }
}

Why is GetMethod returning null?

Answer 1

By default, Reflection will only search for public methods.

You need to pass BindingFlags.Instance | BindingFlags.NonPublic BindingFlags.Instance | BindingFlags.NonPublic .

Answer 2

var methodInfo = this.GetType().GetMethod("AddText", BindingFlags.Instance | BindingFlags.NonPublic, null, new Type[] { typeof(string) }, null);

Your method has a parameter, you need to use the overload that accepts a type array for the parameter types and the binding flags.

In .net Method signatures are based on their name, their return type, and their parameters.

So if your method has parameters you have to tell Reflection what parameter types it has via a Type[].