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ref struct
typesref structs
cannot implement interfacesforeach
statement cannot operate on enumerators in async or iterator methods because type is a ref struct
or a type parameter that allows ref struct
.ref struct
.scoped
modifier can be used for refs and ref struct
values only.ref
field cannot refer to a ref struct
.ref struct
or a type parameter allowing ref structs in order to use it as parameter in the generic type or method.ref struct
type.IDisposable
.ref struct
.scoped
modifier can be used for refs and ref struct
values only.ref
field cannot refer to a ref struct
.ref
field can only be declared in a ref struct
.A ref struct
type can include ref
fields. Other types aren't allowed ref
fields. The compiler enforces restrictions on the declarations and use of ref struct
types to enforce ref safety rules on instances of any ref struct
type:
ref struct
types can contain automatically implemented ref
properties.ref struct
types or ref
variables can have the scoped
modifier.ref
field can be declared only in a ref struct
type.ref
field can't refer to a ref struct
type/Violating any of these rules produces one of the listed errors. If you intended to use that language feature, convert the type to a ref struct
. Otherwise, remove the disallowed construct.
ref structs
cannot implement interfacesforeach
statement cannot operate on enumerators in async or iterator methods because type is a ref struct
or a type parameter that allows ref struct
.ref struct
or a type parameter allowing ref structs in order to use it as parameter in the generic type or method.ref struct
type.IDisposable
.Prior to C# 13, ref struct
types can't implement interfaces; the compiler generates CS8343. Beginning with C# 13, ref struct
types can implement interfaces, subject to the following rules:
ref struct
can't be converted to an instance of an interface it implements. This restriction includes the implicit conversion when you use a ref struct
type as an argument when the parameter is an interface type. The conversion results in a boxing conversion, which violates ref safety.ref struct
that implements an interface must implement all interface members. The ref struct
must implement members where the interface includes a default implementation.Beginning with C# 13, a ref struct
can be used as a type argument for a generic type parameter, if and only if the generic type parameter has the allows ref struct
anti-constraint. When you use the allows ref struct
anti-constraint you must follow these rules:
ref struct
is used as a type argument, the type parameter must have the allows ref struct
anti-constraint.- The allows ref struct
anti-constraint must be last in the where
clause for that parameterref struct
or a type argument that can be a ref struct
type can't be used as the element type for an iterator method..NET feedback
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Events
Mar 17, 11 PM - Mar 21, 11 PM
Join the meetup series to build scalable AI solutions based on real-world use cases with fellow developers and experts.
Register now