Enum is Reference Type or Value Type?

I used Enum property in my EntityFramework 5 class, but in the database this field is nullable. Visual studio gives the error that this property must be a nullable property. My question is: is Enum a reference type or a value type?

System.Enum is a reference type, but any specific enum type is a value type. In the same way, System.ValueType is a reference type, but all types inheriting from it (other than System.Enum) are value types.

So if you have an enum Foo and you want a nullable property, you need the property type to be Foo?.

Value Type and Reference Type, enumerations are of value type. They are created and stored on the stack and passed to the methods by making a copy of the value (by value). An enumeration type (or enum type) is a value type defined by a set of named constants of the underlying integral numeric type. To define an enumeration type, use the enum keyword and specify the names of enum members :

If you do myEnum.SomeValue it will be a value type.

Enumeration types, Structs and Enums are value types. Classes are reference types. In C#, structs are very close to classes in terms of implementation. Values are  Value type stores the value in its memory space, whereas reference type stores the address of the value where it is stored. Primitive data types and struct are of the 'Value' type. Class objects, string, array, delegates are reference types. Value type passes byval by default. Reference type passes byref by default.

public enum TestReferenceOrValue
{
    one, two, three    
}
var a = TestReferenceOrValue.one;
var b = a;
b = TestReferenceOrValue.three;

If enums are by reference, changing b affects a Console.Write(a); → one Console.Write(b); → three

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Value types, Predefined datatypes, structures, enums are also value types, and work in the same way. Value types can be created at compile time and Stored in stack memory,  Swift has two categories of Types: Value and Reference. A value type is a type whose value is copied when it is assigned to a variable or constant, or when it is passed to a function. ⁣ Reference types are not copied when they are assigned to a variable or constant, or when they are passed to a function.

suppose we have enum

public enum eCategory
{
    health ,        
    Weapon
}

and a type of eCategory such as :-

eCategory currentcategory;

then currentcategory is of value type

Enum is Reference Type or Value Type?, The built-in reference types supported by C# include: object, string, and dynamic. All fundamental data types, Boolean, Date, structs, and enums  Reference Types and Value Types behave quite differently in a program so it’s important to understand how these different types work. The best way to do this is to simply write some sample code, maybe create some unit tests, and inspect the results in Visual Studio.

Understanding Value Types And Reference Types In C# Using , In this post we explore the merits of value and reference types, and how on subclasses) the way it enforces immutability for struct and enum. In c#, a data type is a Value Type if it hold the value of variable directly on its own memory space and Value Types will use Stack memory to store the variables values. For example, if we define and assign a value to the variable like int x = 123; then the system will use the same memory space of variable ‘x’ to store the value ‘123’.

Difference between a Value Type and a Reference Type, In Swift there are two categories of types: value types and reference types. There are a few different value types: struct , enum , and tuple . Value types and reference types are the two main categories of C# types. A variable of a value type contains an instance of the type. A variable of a value type contains an instance of the type. This differs from a variable of a reference type, which contains a reference to an instance of the type.

A deep dive: Value and reference types in .Net, Value and Reference Types Types in Swift fall into one of two categories: first, “value types”, where each instance keeps a unique copy of its data, usually defined as a struct, enum, or tuple. The second, “reference types”, where instances share a single copy of the data, and the type is usually defined as a class. In this post we explore the merits of value and reference types, and how to choose between them.

Comments
  • Worth noting that Foo? is sugar for System.Nullable<Foo> and that Nullable is also a value type.
  • I downvoted for your display of erroneous programming conventions. Enum fields should start with an uppercase letter.
  • The above code sample is unhelpful since it would act the same regardless of whether TestReferenceOrValue was a reference type or value type. var a = "a"; var b = a; b = "b"; Console.Write(a); Console.Write(b); shows that strings (and every type) act that way - and string is a reference type. That is because you are overwriting the b variable, not altering the object to which it points.