« Variance » : différence entre les versions
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* [[List#Covariance|List]] | * [[List#Covariance|List]] | ||
* [[CSharp_4#Covariance_et_Contra_variance_des_g.C3.A9n.C3.A9riques|Generics]] | * [[CSharp_4#Covariance_et_Contra_variance_des_g.C3.A9n.C3.A9riques|Generics]] | ||
= [https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/covariance-contravariance Description] = | |||
Covariance enable implicit reference conversion for array types, delegate types, and generic type arguments.<br> | |||
Covariance preserves assignment compatibility and contravariance reverses it. | |||
= Assignment compatibility = | |||
<kode lang='cs'> | |||
string s = "test"; | |||
// An object of a more derived type is assigned to an object of a less derived type. | |||
object o = s; | |||
</kode> | |||
Version du 26 mars 2024 à 14:15
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Description
Covariance enable implicit reference conversion for array types, delegate types, and generic type arguments.
Covariance preserves assignment compatibility and contravariance reverses it.
Assignment compatibility
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string s = "test"; // An object of a more derived type is assigned to an object of a less derived type. object o = s; |
