How do I return a generic type in C#?

How do I return a generic type in C#?

You have to convert the type of your return value of the method to the Generic type which you pass to the method during calling. You need pass a type that is type casteable for the value you return through that method.

How do you write a generic class in C#?

First create a class as in the following code.

1. class CompareClass {
2. public bool Compare(string x, string y) {
3. if (x.Equals(y)) return true;
4. else return false;
5. }
6. public bool Compare(int x, int y) {
7. if (x.Equals(y)) return true;
8. else return false;

What is a generic class in C#?

Generic is a class which allows the user to define classes and methods with the placeholder. This means that you can put any object in a collection because all classes in the C# programming language extend from the object base class.

What is a return type C#?

Defining Methods in C# The return type is the data type of the value the method returns. If the method is not returning any values, then the return type is void. The parameter list refers to the type, order, and number of the parameters of a method.

Can I return null in C#?

If the developer really needs to return a null value from the method (in 99% of cases this is not necessary), the return type can be marked as a nullable reference type (the feature was introduced in C# 8.0). The method signature clearly states that it can return a null reference.

What is generic collection in C#?

A generic collection is strongly typed (you can store one type of objects into it) so that we can eliminate runtime type mismatches, it improves the performance by avoiding boxing and unboxing. Generic. Generic is the key concept to develop Generic collection.

Can we inherit generic class in C#?

Inheritance With Generic Class in C# We can derive a generic class to make subclasses of it. Let’s take and example. We can also make the derived class a generic class.

What are the advantages of generics in C#?

There are many advantages to using generic collections and delegates:

• Type safety.
• Less code and code is more easily reused.
• Better performance.
• Generic delegates enable type-safe callbacks without the need to create multiple delegate classes.
• Generics streamline dynamically generated code.

How does return work in C#?

return (C# Reference) The return statement terminates execution of the method in which it appears and returns control to the calling method. It can also return an optional value. If the method is a void type, the return statement can be omitted.

How do I return a func in C#?

The generic parameters on both types determine the type signature of the method. If your method has no return value use Action . If it has a return value use Func whereby the last generic parameter is the return type. The return type is Func .

What does return null mean in C#?

Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies data has been returned, whereas returning null clearly indicates that nothing has been returned.

When to use Ref new, gcnew for generic classes?

Any use of ref new, gcnew for the type parameter will be appropriately interpreted by the runtime as the simple creation of a value type if the type argument is a value type. You can also declare a generic class with Constraints on Generic Type Parameters (C++/CLI) on the types that can be used for the type parameter.

How to make the return type of a method generic?

You need pass a type that is type casteable for the value you return through that method. If you would want to return a value which is not type casteable to the generic type you pass, you might have to alter the code or make sure you pass a type that is casteable for the return value of method. So, this approach is not reccomended.

How are generic classes defined in C #?

C# allows you to define generic classes, interfaces, abstract classes, fields, methods, static methods, properties, events, delegates, and operators using the type parameter and without the specific data type. A type parameter is a placeholder for a particular type specified when creating an instance of the generic type.

Which is an example of a generic in C + +?

Generics in C++. Generics is the idea to allow type (Integer, String, … etc and user-defined types) to be a parameter to methods, classes and interfaces. For example, classes like an array, map, etc, which can be used using generics very efficiently. We can use them for any type.