How to pass a Class as parameter for a method?

Question

I have two classs:

Class Gold;
Class Functions;

There is a method ClassGet in class Functions, which has 2 parameters. I want to send the class Gold as parameter for one of my methods in class Functions. How is it possible?

For example:

public void ClassGet(class MyClassName, string blabla)
{
    MyClassName NewInstance = new MyClassName();
}

Attention: I want to send MyClassName as string parameter to my method.

just create an object for gold class and pass it to function as argument. — s.d, Sep 14 '13 at 21:32
I believe this is not a good practice to do, passing class names around as strings. — ThomasRogers, Aug 03 '22 at 10:22

score 24 · Answer 1 · answered Sep 14 '13 at 21:34

24

Are you looking for type parameters?

Example:

    public void ClassGet<T>(string blabla) where T : new()
    {
        var myClass = new T();
        //Do something with blablah
    }

answered Sep 14 '13 at 21:34

Khan

17,904
5
47
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Jeroen van Langen · Accepted Answer · 2021-06-23T06:45:00.347

The function you're trying to implement already exists (a bit different)

Look at the Activator class: http://msdn.microsoft.com/en-us/library/system.activator.aspx

example:

private static object CreateByTypeName(string typeName)
{
    // scan for the class type
    var type = (from assembly in AppDomain.CurrentDomain.GetAssemblies()
                from t in assembly.GetTypes()
                where t.Name == typeName  // you could use the t.FullName as well
                select t).FirstOrDefault();

    if (type == null)
        throw new InvalidOperationException("Type not found");

    return Activator.CreateInstance(type);
}

Usage:

var myClassInstance = CreateByTypeName("MyClass");

score 7 · Answer 3 · answered Sep 14 '13 at 21:34

7

You could send it as a parameter of the type Type, but then you would need to use reflection to create an instance of it. You can use a generic parameter instead:

public void ClassGet<MyClassName>(string blabla) where MyClassName : new() {
  MyClassName NewInstance = new MyClassName();
}

answered Sep 14 '13 at 21:34

Guffa

687,336
108
737
1,005

Wrong answer...I Want to Send my Class name as string as parameter to my method – Amin AmiriDarban Sep 14 '13 at 21:39
11

As a string? That's definitely not what you asked for... so, wrong question. ;) Then you would use the `Activator.CreateInstance(typestr, false)` method to create an instance from that string. – Guffa Sep 14 '13 at 21:47

score -3 · Answer 4 · answered Sep 14 '13 at 22:30

 public void ClassGet(string Class, List<string> Methodlist)
        {
            Type ClassType;
            switch (Class)
            {
                case "Gold":
                    ClassType = typeof(Gold); break;//Declare the type by Class name string
                case "Coin":
                    ClassType = typeof(Coin); break;
                default:
                    ClassType = null;
                    break;
            }
            if (ClassType != null)
            {
                object Instance = Activator.CreateInstance(ClassType); //Create instance from the type

            }

        }

How to pass a Class as parameter for a method?

4 Answers4

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