« Parameter modifiers » : différence entre les versions

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void Method3(ref Item item) => item = new("new name 3");
void Method3(ref Item item) => item = new("new name 3");
</kode>
</kode>
= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#ref-readonly-modifier ref readonly] =


= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#out-parameter-modifier out] =
= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#out-parameter-modifier out] =

Version du 24 mai 2024 à 15:17

ref

Pass a parameter by reference.

Cs.svg
// value type
var i = 10;
Method0(i);     // 10
Method1(ref i); // 11

void Method0(int i) => i++;     // pass the value type parameter by value (copy)
void Method1(ref int i) => i++; // pass the value type parameter by reference

// reference type
var item = new Item("init name");
Method2(item);     // init name
Method3(ref item); // new name 3

// pass the reference type parameter by value: the reference is passed by value (copy)
// if the parameter is overwritten (the copy of the reference is overwritten), it doesn't affect the initial object
void Method2(Item item) => item = new("new name 2");

// pass the reference type parameter by reference: the reference is passed by reference
// if the parameter is overwritten (the initial reference is overwritten), it does affect the initial object
void Method3(ref Item item) => item = new("new name 3");

ref readonly

out

Allow to initialize the parameter in the method.

Cs.svg
Method5(out var j); // 5

void Method5(out int i) => i = 5;