C_Sharp_Language

C Sharp TutorialC Sharp .NET Compiler Platform (Roslyn)C Sharp 3.0 FeaturesC Sharp 4.0 FeaturesC Sharp 5.0 FeaturesC Sharp 6.0 FeaturesC Sharp 7.0 FeaturesC Sharp Access ModifiersC Sharp Access network shared folder with username and passwordC Sharp Accessing DatabasesC Sharp Action FiltersC Sharp Aliases of built-in typesC Sharp an overview of collectionsC Sharp Anonymous typesC Sharp ArraysC Sharp ASP.NET IdentityC Sharp AssemblyInfo.cs ExamplesC Sharp Async-AwaitC Sharp Async/await, Backgroundworker, Task and Thread ExamplesC Sharp Asynchronous SocketC Sharp AttributesC Sharp Authentication handlerC Sharp BackgroundWorkerC Sharp BigIntegerC Sharp Binary SerializationC Sharp BindingListC Sharp Built-in TypesC Sharp CachingC Sharp CastingC Sharp Checked and UncheckedC Sharp CLSCompliantAttributeC Sharp Code ContractsC Sharp Code Contracts and AssertionsC Sharp Collection InitializersC Sharp Comments and regionsC Sharp Common String OperationsC Sharp Conditional StatementsC Sharp Constructors and FinalizersC Sharp Creating Own MessageBox in Windows Form ApplicationC Sharp Creational Design PatternsC Sharp Cryptography (System.Security.Cryptography)C Sharp Data AnnotationC Sharp DateTime MethodsC Sharp DelegatesC Sharp Dependency InjectionC Sharp DiagnosticsC Sharp Dynamic typeC Sharp EnumC Sharp Equality OperatorC Sharp Equals and GetHashCodeC Sharp EventsC Sharp Exception HandlingC Sharp Expression TreesC Sharp Extension MethodsC Sharp File and Stream I/OC Sharp FileSystemWatcherC Sharp Func delegatesC Sharp Function with multiple return valuesC Sharp Functional ProgrammingC Sharp Garbage Collector in .NETC Sharp Generating Random NumbersC Sharp Generic Lambda Query BuilderC Sharp GenericsC Sharp Getting Started: Json with C SharpC Sharp GuidC Sharp Handling FormatException when converting string to other typesC Sharp Hash FunctionsC Sharp ICloneableC Sharp IComparableC Sharp IDisposable interfaceC Sharp IEnumerableC Sharp ILGeneratorC Sharp ImmutabilityC Sharp Implementing Decorator Design PatternC Sharp Implementing Flyweight Design PatternC Sharp Import Google ContactsC Sharp Including Font ResourcesC Sharp IndexerC Sharp InheritanceC Sharp Initializing PropertiesC Sharp INotifyPropertyChanged interfaceC Sharp InterfacesC Sharp InteroperabilityC Sharp IQueryable interfaceC Sharp IteratorsC Sharp KeywordsC Sharp Lambda expressionsC Sharp Lambda ExpressionsC Sharp LINQ QueriesC Sharp LINQ to Objects



C Sharp Function with multiple return values

From WikiOD

Remarks[edit | edit source]

There is no inherent answer in C# to this - so called - need. Nonetheless there are workarounds to satisfy this need.

The reason I qualify the need as "so called" is that we only need methods with 2 or more than 2 values to return when we violate good programming principals. Especially the Single Responsibility Principle.

Hence, it would be better to be alerted when we need functions returning 2 or more values, and improve our design.

"anonymous object" + "dynamic keyword" solution[edit | edit source]

You can return an anonymous object from your function

public static object FunctionWithUnknowReturnValues ()
{
    /// anonymous object
    return new { a = 1, b = 2 };
}

And assign the result to a dynamic object and read the values in it.

/// dynamic object
dynamic x = FunctionWithUnknowReturnValues();

Console.WriteLine(x.a);
Console.WriteLine(x.b);

Tuple solution[edit | edit source]

You can return an instance of Tuple class from your function with two template parameters as Tuple<string, MyClass>:

public Tuple<string, MyClass> FunctionWith2ReturnValues ()
{
    return Tuple.Create("abc", new MyClass());
}

And read the values like below:

Console.WriteLine(x.Item1);
Console.WriteLine(x.Item2);

Ref and Out Parameters[edit | edit source]

The ref keyword is used to pass an Argument as Reference. out will do the same as ref but it does not require an assigned value by the caller prior to calling the function.

Ref Parameter :-If you want to pass a variable as ref parameter then you need to initialize it before you pass it as ref parameter to method.

Out Parameter :- If you want to pass a variable as out parameter you don’t need to initialize it before you pass it as out parameter to method.

static void Main(string[] args)
{
    int a = 2;
    int b = 3;
    int add = 0;
    int mult= 0;
    AddOrMult(a, b, ref add, ref mult); //AddOrMult(a, b, out add, out mult);
    Console.WriteLine(add); //5
    Console.WriteLine(mult); //6
}

private static void AddOrMult(int a, int b, ref int add, ref int mult) //AddOrMult(int a, int b, out int add, out int mult)
{
    add = a + b;
    mult = a * b;
}

Credit:Stack_Overflow_Documentation