Using List in C# (Generics)

Question

That\'s a pretty elementary question, but I have never delved into generics before and I found myself in the need to use it. Unfortunately I don\'t have the time right now to go

Answer 1

You need to add the generic type parameter for T to your method:

void MyMethod<T>(List<T> list) {

The compiler doesn't know what T represents, otherwise.

Answer 2

You need to let c# know what type is sent:

List<MyClass1> list1 = getListType1();
List<MyClass2> list2 = getListType2();

if (someCondition)
    MyMethod<MyClass1>(list1);
else
    MyMethod<MyClass2>(list2);

void MyMethod<T>(List<T> list){
    //Do stuff
}

Answer 3

You need to declare T against the method, then C# can identify the type the method is receiving. Try this:

void MyMethod<T>(List<T> list){
    //Do stuff
}

Then call it by doing:

if (someCondition)
    MyMethod(list1);
else
    MyMethod(list2);

You can make it even stricter, if all classes you are going to pass to the method share a common base class:

void MyMethod<T>(List<T> list) where T : MyClassBase

Answer 4

Basically, In C#, List < T > class represents a strongly typed list of objects that can be accessed by index.

And it also supports storing values of a specific type without casting to or from object.

we can use in Interger value & String Value in the List.