ObjectIDGenerator.HasId(Object, Boolean) Method

Reference

Definition

Namespace:: System.Runtime.Serialization

Assemblies:: netstandard.dll, System.Runtime.Serialization.Formatters.dll

Assembly:: System.Runtime.Serialization.Formatters.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Package:: System.Runtime.Serialization.Formatters v10.0.0-preview.1.25080.5

Source:: ObjectIDGenerator.cs

Source:: ObjectIDGenerator.cs

Source:: ObjectIDGenerator.cs

Source:: ObjectIDGenerator.cs

Important

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Determines whether an object has already been assigned an ID.

public:
 virtual long HasId(System::Object ^ obj, [Runtime::InteropServices::Out] bool % firstTime);

public virtual long HasId(object obj, out bool firstTime);

abstract member HasId : obj * bool -> int64
override this.HasId : obj * bool -> int64

Public Overridable Function HasId (obj As Object, ByRef firstTime As Boolean) As Long

Parameters

obj: Object

The object you are asking for.

firstTime: Boolean

true if obj was not previously known to the ObjectIDGenerator; otherwise, false.

Returns

Int64

The object ID of obj if previously known to the ObjectIDGenerator; otherwise, zero.

Exceptions

ArgumentNullException

The obj parameter is null.

Remarks

If the object has already been assigned an ID, the ID is returned and firstTime is set to false; otherwise, zero is returned and firstTime is set to true. HasId differs from GetId in that it never creates an ID for an object that has not already been seen by the ObjectIDGenerator.

Applies to

Product	Versions
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8 (package-provided), 8, 9 (package-provided), 9, 10 (package-provided), 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1

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