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StringEnumerator.Current Property

Gets the current element in the collection.

[Visual Basic]
Public ReadOnly Property Current As String
[C#]
public string Current {get;}
[C++]
public: __property String* get_Current();
[JScript]
public function get Current() : String;

Property Value

The current element in the collection.

Exceptions

Exception Type Condition
InvalidOperationException The enumerator is positioned before the first element of the collection or after the last element.

Remarks

After an enumerator is created or after a Reset, MoveNext must be called to advance the enumerator to the first element of the collection before reading the value of Current; otherwise, Current is undefined.

Current also throws an exception if the last call to MoveNext returned false, which indicates the end of the collection.

Current does not move the position of the enumerator and consecutive calls to Current return the same object until either MoveNext or Reset is called.

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 is irrecoverably invalidated and the next call to MoveNext or Reset throws an InvalidOperationException. If the collection is modified between MoveNext and Current, Current will return the element that it is set to, even if the enumerator is already invalidated.

Example

[Visual Basic, C#, C++] The following code example demonstrates several of the properties and methods of StringEnumerator.

[Visual Basic] 
Imports System
Imports System.Collections.Specialized

Public Class SamplesStringEnumerator

   Public Shared Sub Main()

      ' Creates and initializes a StringCollection.
      Dim myCol As New StringCollection()
      Dim myArr() As [String] = {"red", "orange", "yellow", "green", "blue", "indigo", "violet"}
      myCol.AddRange(myArr)

      ' Enumerates the elements in the StringCollection.
      Dim myEnumerator As StringEnumerator = myCol.GetEnumerator()
      While myEnumerator.MoveNext()
         Console.WriteLine("{0}", myEnumerator.Current)
      End While
      Console.WriteLine()

      ' Resets the enumerator and displays the first element again.
      myEnumerator.Reset()
      If myEnumerator.MoveNext() Then
         Console.WriteLine("The first element is {0}.", myEnumerator.Current)
      End If 

   End Sub 'Main

End Class 'SamplesStringEnumerator 


'This code produces the following output.
'
'red
'orange
'yellow
'green
'blue
'indigo
'violet
'
'The first element is red.


[C#] 
using System;
using System.Collections.Specialized;

public class SamplesStringEnumerator  {

   public static void Main()  {

      // Creates and initializes a StringCollection.
      StringCollection myCol = new StringCollection();
      String[] myArr = new String[] { "red", "orange", "yellow", "green", "blue", "indigo", "violet" };
      myCol.AddRange( myArr );

      // Enumerates the elements in the StringCollection.
      StringEnumerator myEnumerator = myCol.GetEnumerator();
      while ( myEnumerator.MoveNext() )
         Console.WriteLine( "{0}", myEnumerator.Current );
      Console.WriteLine();

      // Resets the enumerator and displays the first element again.
      myEnumerator.Reset();
      if ( myEnumerator.MoveNext() )
         Console.WriteLine( "The first element is {0}.", myEnumerator.Current );

   }

}

/*
This code produces the following output.

red
orange
yellow
green
blue
indigo
violet

The first element is red.

*/

[C++] 
#using <mscorlib.dll>
#using <System.dll>

using namespace System;
using namespace System::Collections::Specialized;

int main() {

   // Creates and initializes a StringCollection.
   StringCollection* myCol = new StringCollection();
   String* myArr[] = { S"red", S"orange", S"yellow", S"green", S"blue", S"indigo", S"violet" };
   myCol->AddRange(myArr);

   // Enumerates the elements in the StringCollection.
   StringEnumerator* myEnumerator = myCol->GetEnumerator();
   while (myEnumerator->MoveNext())
      Console::WriteLine(S"{0}", myEnumerator->Current);
   Console::WriteLine();

   // Resets the enumerator and displays the first element again.
   myEnumerator->Reset();
   if (myEnumerator->MoveNext())
      Console::WriteLine(S"The first element is {0}.", myEnumerator->Current);

}


/*
This code produces the following output.

red
orange
yellow
green
blue
indigo
violet

The first element is red.

*/

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

StringEnumerator Class | StringEnumerator Members | System.Collections.Specialized Namespace | MoveNext | Reset | IEnumerator.Current

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