« Parameter modifiers » : différence entre les versions
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[[Category:CSharp]] | [[Category:CSharp]] | ||
= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#ref-parameter-modifier ref] = | = [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#ref-parameter-modifier ref] = | ||
Pass a | Pass a parameter by reference. | ||
<kode lang='cs'> | <kode lang='cs'> | ||
// value type | |||
var i = 10; | var i = 10; | ||
Method0(i); // 10 | Method0(i); // 10 | ||
| Ligne 9 : | Ligne 10 : | ||
void Method0(int i) => i++; // pass the value type parameter by value: make a copy | void Method0(int i) => i++; // pass the value type parameter by value: make a copy | ||
void Method1(ref int i) => i++; // pass the value type parameter by reference | 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 copied and passed to the method | |||
// if the parameter is overwritten by another one, 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 to the method | |||
// if the parameter is overwritten by another one, it does affect the initial object | |||
void Method3(ref Item item) => item = new("new name 3"); | |||
</kode> | </kode> | ||
Version du 24 mai 2024 à 15:02
ref
Pass a parameter by reference.
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// value type
var i = 10;
Method0(i); // 10
Method1(ref i); // 11
void Method0(int i) => i++; // pass the value type parameter by value: make a 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 copied and passed to the method
// if the parameter is overwritten by another one, 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 to the method
// if the parameter is overwritten by another one, it does affect the initial object
void Method3(ref Item item) => item = new("new name 3");
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