Calling class object's function from string in c#

Question

I'm using WPF mvvm pattern anyway if some method got string parameter is this possible calling like

SomeClass1 sc  = new SomeClass();
DummyClass2 dc = new DummyClass2();

public void SomeMethod(string param) //param = "SomeMethodName"
{ 
    sc.'param'(dc);
}

The key is calling class object's fuction via param without branch or Data structure mapping.

maybe using reflection.. any good idea?

Anyhow, you shouldn't be required to do this, are you trying to invoke a function when a button is clicked or something, you can use commands for it for example — skjagini, Sep 14 '18 at 00:42

tymtam · Accepted Answer · 2018-09-14T00:50:41.403

Yes that's possible via reflection. You can use the Invoke method.

It would look something like this:

MethodInfo method = type.GetMethod(name); object result = method.Invoke(objectToCallTheMethodOn);

Having said that, in normal circumstances you shouldn't use reflection to call methods in c#. It's only for really special cases.

Here's a full example:

class A 
{
    public int MyMethod(string name) {
        Console.WriteLine( $"Hi {name}!" );
        return 7;
    }
}



public static void Main()
{
    var a = new A();
    var ret = CallByName(a, "MyMethod", new object[] { "Taekyung Lee" } );
    Console.WriteLine(ret);
}

private static object CallByName(A a, string name, object[] paramsToPass )
{
    //Search public methods
    MethodInfo method = a.GetType().GetMethod(name);
    if( method == null )
    {
        throw new Exception($"Method {name} not found on type {a.GetType()}, is the method public?");
    }
    object result = method.Invoke(a, paramsToPass);
    return result;
}

This prints:

Hi Taekyung Lee!
7

Calling class object's function from string in c#

1 Answers1