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Version du 24 mai 2024 à 15:28

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What's new in C# 12

Primary constructors

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 readonly 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];

ref readonly modifier

@@ Ligne 32 : / Ligne 32 : @@
 </kode>
-= [https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/method-parameters#ref-readonly-modifier ref readonly modifier] =
+= [[Parameter_modifiers#ref_readonly|ref readonly modifier]] =
-<kode lang='cs'>
-var item = new Item("name");
-ForceByRef(ref item);
-static void ForceByRef(ref readonly Item item)
-{
-    item = new Item("new name"); // you can't assign a readonly variable
-    item.Name = "new name";      // you can modify the object properties
-}
-</kode>