StringCollection.Insert(Int32, String) StringCollection.Insert(Int32, String) StringCollection.Insert(Int32, String) StringCollection.Insert(Int32, String) Method

Определение

Вставляет строку в StringCollection по указанному индексу.Inserts a string into the StringCollection at the specified index.

public:
 void Insert(int index, System::String ^ value);
public void Insert (int index, string value);
member this.Insert : int * string -> unit
Public Sub Insert (index As Integer, value As String)

Параметры

index
Int32 Int32 Int32 Int32

Индекс (с нуля) места вставки параметра value.The zero-based index at which value is inserted.

value
String String String String

Строка, которую требуется вставить.The string to insert. Допускается значение null.The value can be null.

Исключения

Значение параметра index меньше нуля.index is less than zero.

- или --or- Значение index больше значения Count.index greater than Count.

Примеры

В следующем примере кода добавляются новые элементы в StringCollection.The following code example adds new elements to the StringCollection.

#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintValues( IEnumerable^ myCol );
int main()
{
   
   // Creates and initializes a new StringCollection.
   StringCollection^ myCol = gcnew StringCollection;
   Console::WriteLine( "Initial contents of the StringCollection:" );
   PrintValues( myCol );
   
   // Adds a range of elements from an array to the end of the StringCollection.
   array<String^>^myArr = {"RED","orange","yellow","RED","green","blue","RED","indigo","violet","RED"};
   myCol->AddRange( myArr );
   Console::WriteLine( "After adding a range of elements:" );
   PrintValues( myCol );
   
   // Adds one element to the end of the StringCollection and inserts another at index 3.
   myCol->Add( "* white" );
   myCol->Insert( 3, "* gray" );
   Console::WriteLine( "After adding \"* white\" to the end and inserting \"* gray\" at index 3:" );
   PrintValues( myCol );
}

void PrintValues( IEnumerable^ myCol )
{
   IEnumerator^ myEnum = myCol->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      Console::WriteLine( "   {0}", obj );
   }

   Console::WriteLine();
}

/*
This code produces the following output.

Initial contents of the StringCollection:

After adding a range of elements:
   RED
   orange
   yellow
   RED
   green
   blue
   RED
   indigo
   violet
   RED

After adding "* white" to the end and inserting "* gray" at index 3:
   RED
   orange
   yellow
   * gray
   RED
   green
   blue
   RED
   indigo
   violet
   RED
   * white

*/
using System;
using System.Collections;
using System.Collections.Specialized;

public class SamplesStringCollection  {

   public static void Main()  {

      // Creates and initializes a new StringCollection.
      StringCollection myCol = new StringCollection();

      Console.WriteLine( "Initial contents of the StringCollection:" );
      PrintValues( myCol );

      // Adds a range of elements from an array to the end of the StringCollection.
      String[] myArr = new String[] { "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };
      myCol.AddRange( myArr );

      Console.WriteLine( "After adding a range of elements:" );
      PrintValues( myCol );

      // Adds one element to the end of the StringCollection and inserts another at index 3.
      myCol.Add( "* white" );
      myCol.Insert( 3, "* gray" );

      Console.WriteLine( "After adding \"* white\" to the end and inserting \"* gray\" at index 3:" );
      PrintValues( myCol );

   }

   public static void PrintValues( IEnumerable myCol )  {
      foreach ( Object obj in myCol )
         Console.WriteLine( "   {0}", obj );
      Console.WriteLine();
   }

}

/*
This code produces the following output.

Initial contents of the StringCollection:

After adding a range of elements:
   RED
   orange
   yellow
   RED
   green
   blue
   RED
   indigo
   violet
   RED

After adding "* white" to the end and inserting "* gray" at index 3:
   RED
   orange
   yellow
   * gray
   RED
   green
   blue
   RED
   indigo
   violet
   RED
   * white

*/
Imports System.Collections
Imports System.Collections.Specialized

Public Class SamplesStringCollection   

   Public Shared Sub Main()

      ' Creates and initializes a new StringCollection.
      Dim myCol As New StringCollection()

      Console.WriteLine("Initial contents of the StringCollection:")
      PrintValues(myCol)

      ' Adds a range of elements from an array to the end of the StringCollection.
      Dim myArr() As [String] = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
      myCol.AddRange(myArr)

      Console.WriteLine("After adding a range of elements:")
      PrintValues(myCol)

      ' Adds one element to the end of the StringCollection and inserts another at index 3.
      myCol.Add("* white")
      myCol.Insert(3, "* gray")

      Console.WriteLine("After adding ""* white"" to the end and inserting ""* gray"" at index 3:")
      PrintValues(myCol)

   End Sub

   Public Shared Sub PrintValues(myCol As IEnumerable)
      Dim obj As [Object]
      For Each obj In  myCol
         Console.WriteLine("   {0}", obj)
      Next obj
      Console.WriteLine()
   End Sub

End Class


'This code produces the following output.
'
'Initial contents of the StringCollection:
'
'After adding a range of elements:
'   RED
'   orange
'   yellow
'   RED
'   green
'   blue
'   RED
'   indigo
'   violet
'   RED
'
'After adding "* white" to the end and inserting "* gray" at index 3:
'   RED
'   orange
'   yellow
'   * gray
'   RED
'   green
'   blue
'   RED
'   indigo
'   violet
'   RED
'   * white
'

Комментарии

В StringCollectionдопускается использование повторяющихся строк.Duplicate strings are allowed in StringCollection.

Если index параметр StringCollectionравен, тоvalue добавляется в конец. CountIf index is equal to Count, value is added to the end of StringCollection.

В коллекциях с непрерывным набором элементов, таких как списки, чтобы выделить место новому элементу, следующие за точкой вставки элементы перемещаются вниз.In collections of contiguous elements, such as lists, the elements that follow the insertion point move down to accommodate the new element. Если коллекция индексируется, индексы перемещенных элементов также обновляются.If the collection is indexed, the indexes of the elements that are moved are also updated. Такое поведение не реализуется в коллекциях, в которых элементы логически сгруппированы, например в хэш-таблицах.This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.

Этот метод является операцией On(), где n имеет Count.This method is an O(n) operation, where n is Count.

Применяется к

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