OidCollection Class


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Represents a collection of Oid objects. This class cannot be inherited.

Namespace:   System.Security.Cryptography
Assembly:  System (in System.dll)


public ref class OidCollection sealed : ICollection, IEnumerable


Initializes a new instance of the OidCollection class.


Gets the number of Oid objects in a collection.


Gets a value that indicates whether access to the OidCollection object is thread safe.


Gets an Oid object from the OidCollection object.


Gets the first Oid object that contains a value of the Value property or a value of the FriendlyName property that matches the specified string value from the OidCollection object.


Gets an object that can be used to synchronize access to the OidCollection object.


Adds an Oid object to the OidCollection object.

System_CAPS_pubmethodCopyTo(array<Oid^>^, Int32)

Copies the OidCollection object into an array.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Returns an OidEnumerator object that can be used to navigate the OidCollection object.


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodICollection::CopyTo(Array^, Int32)

Copies the OidCollection object into an array.


Returns an OidEnumerator object that can be used to navigate the OidCollection object.


Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.)


Overloaded. Converts an IEnumerable to an IQueryable.(Defined by Queryable.)


Casts the elements of an IEnumerable to the specified type.(Defined by Enumerable.)


Filters the elements of an IEnumerable based on a specified type.(Defined by Enumerable.)

This class implements the ICollection interface.

The following code example shows how to use the OidCollection class.

#using <system.dll>

using namespace System;
using namespace System::Security::Cryptography;
int main()

   // Assign values to strings.
   String^ Value1 = "1.2.840.113549.1.1.1";
   String^ Name1 = "3DES";
   String^ Value2 = "";
   String^ InvalidName = "This name is not a valid name";
   String^ InvalidValue = "";

   // Create new Oid objects using the specified values.
   // Note that the corresponding Value or Friendly Name property is automatically added to the object.
   Oid ^ o1 = gcnew Oid( Value1 );
   Oid ^ o2 = gcnew Oid( Name1 );

   // Create a new Oid object using the specified Value and Friendly Name properties.
   // Note that the two are not compared to determine if the Value is associated 
   //  with the Friendly Name.
   Oid ^ o3 = gcnew Oid( Value2,InvalidName );

   //Create a new Oid object using the specified Value. Note that if the value
   //  is invalid or not known, no value is assigned to the Friendly Name property.
   Oid ^ o4 = gcnew Oid( InvalidValue );

   //Write out the property information of the Oid objects.
   Console::WriteLine( "Oid1: Automatically assigned Friendly Name: {0}, {1}", o1->FriendlyName, o1->Value );
   Console::WriteLine( "Oid2: Automatically assigned Value: {0}, {1}", o2->FriendlyName, o2->Value );
   Console::WriteLine( "Oid3: Name and Value not compared: {0}, {1}", o3->FriendlyName, o3->Value );
   Console::WriteLine( "Oid4: Invalid Value used: {0}, {1} {2}", o4->FriendlyName, o4->Value, Environment::NewLine );

   //Create an Oid collection and add several Oid objects.
   OidCollection ^ oc = gcnew OidCollection;
   oc->Add( o1 );
   oc->Add( o2 );
   oc->Add( o3 );
   Console::WriteLine( "Number of Oids in the collection: {0}", oc->Count );
   Console::WriteLine( "Is synchronized: {0} {1}", oc->IsSynchronized, Environment::NewLine );

   //Create an enumerator for moving through the collection.
   OidEnumerator ^ oe = oc->GetEnumerator();

   //You must execute a MoveNext() to get to the first item in the collection.

   // Write out Oids in the collection.
   Console::WriteLine( "First Oid in collection: {0},{1}", oe->Current->FriendlyName, oe->Current->Value );
   Console::WriteLine( "Second Oid in collection: {0},{1}", oe->Current->FriendlyName, oe->Current->Value );

   //Return index in the collection to the beginning.

.NET Framework
Available since 2.0

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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