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CriticalHandle.IsInvalid Property

  • Reference

Definition

Namespace:
System.Runtime.InteropServices
Assemblies:
mscorlib.dll, System.Runtime.Handles.dll
Assembly:
System.Runtime.dll
Assembly:
System.Runtime.Handles.dll
Assembly:
mscorlib.dll
Assembly:
System.Runtime.InteropServices.dll
Assembly:
netstandard.dll
Source:
CriticalHandle.cs
Source:
CriticalHandle.cs
Source:
CriticalHandle.cs

When overridden in a derived class, gets a value indicating whether the handle value is invalid.

public:
 abstract property bool IsInvalid { bool get(); };
public abstract bool IsInvalid { get; }
member this.IsInvalid : bool
Public MustOverride ReadOnly Property IsInvalid As Boolean

Property Value

Boolean

true if the handle is valid; otherwise, false.

Remarks

Derived classes must implement the IsInvalid property so that the common language runtime can determine whether critical finalization is required. Derived classes must provide an implementation that suits the general type of handle they support (0 or -1 is invalid). These classes can then be further derived for specific safe handle types.

Unlike the IsClosed property, which reports whether the CriticalHandle object has finished using the underlying handle, the IsInvalid property calculates whether the given handle value is always considered invalid. Therefore, the IsInvalid property always returns the same value for any one handle value.

Applies to

See also