OidEnumerator::Reset Method ()
Sets an enumerator to its initial position.
Assembly: System (in System.dll)
| Exception | Condition |
|---|---|
| InvalidOperationException | The collection was modified after the enumerator was created. |
The initial position of an enumerator is before the first element in the OidCollection object. An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator becomes invalid and the next call to the Reset method throws an InvalidOperationException.
The following code example shows how to use the OidEnumerator 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 = "1.3.6.1.4.1.311.20.2"; String^ InvalidName = "This name is not a valid name"; String^ InvalidValue = "1.1.1.1.1.1.1.1"; // 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. oe->MoveNext(); // Write out Oids in the collection. Console::WriteLine( "First Oid in collection: {0},{1}", oe->Current->FriendlyName, oe->Current->Value ); oe->MoveNext(); Console::WriteLine( "Second Oid in collection: {0},{1}", oe->Current->FriendlyName, oe->Current->Value ); //Return index in the collection to the beginning. oe->Reset(); }
Available since 2.0