« Csharp 12 » : différence entre les versions
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Aucun résumé des modifications |
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| (5 versions intermédiaires par le même utilisateur non affichées) | |||
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= [https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/primary-constructors Primary constructors] = | = [https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/primary-constructors Primary constructors] = | ||
{{warn | Default value parameters must be compile time consistant.}} | |||
<kode lang='cs'> | <kode lang='cs'> | ||
public class Item | public class Item | ||
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public class Item(string name) | public class Item(string name) | ||
{ | { | ||
public | public string Name { get; } = name; | ||
} | } | ||
</kode> | </kode> | ||
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<kode lang='cs'> | <kode lang='cs'> | ||
// initialization | // initialization | ||
int[] a = [1, 2, 3]; | int[] a = [1, 2, 3]; | ||
List<int> l = [4, 5, 6]; | List<int> l = [4, 5, 6]; | ||
// concat items from different collections with the spread element: ..e | // concat items from different collections with the spread element: ..e | ||
int[] all = [.. a, .. l]; | int[] all = [.. a, .. l]; // [1, 2, 3, 4, 5, 6]; | ||
</kode> | </kode> | ||
= [[Parameter_modifiers#ref_readonly|ref readonly modifier]] = | |||
Dernière version du 16 septembre 2024 à 13:33
Links
Primary constructors
 |
Default value parameters must be compile time consistant. |
|
public class Item
{
public readonly string Name { get; }
public Item (string name)
{
Name = name;
}
}
// equivalent with a primary constructor
public class Item(string name)
{
public string Name { get; } = name;
}
|
Collection Expressions
|
|
// initialization int[] a = [1, 2, 3]; List<int> l = [4, 5, 6]; // concat items from different collections with the spread element: ..e int[] all = [.. a, .. l]; // [1, 2, 3, 4, 5, 6]; |
