StringCollection.Add メソッド

.NET Framework クラス ライブラリ リファレンス

StringCollection.Add メソッド

文字列を StringCollection の末尾に追加します。

名前空間: System.Collections.Specialized
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Function Add ( _
    value As String _
) As Integer

Visual Basic (使用法)

Dim instance As StringCollection
Dim value As String
Dim returnValue As Integer

returnValue = instance.Add(value)

C#

public int Add (
    string value
)

C++

public:
int Add (
    String^ value
)

J#

public int Add (
    String value
)

JScript

public function Add (
    value : String
) : int

パラメータ

value

StringCollection の末尾に追加する文字列。値は null 参照 (Visual Basic では Nothing) に設定できます。

戻り値
新しい要素が挿入される位置の 0 から始まるインデックス。

解説

StringCollection は、null 参照 (Visual Basic では Nothing) を有効な値として受け取り、要素の重複を許可します。

Count が容量より小さい場合、このメソッドは O(1) 操作になります。新しい要素を格納するために容量を増やす必要がある場合、このメソッドは O(n) 操作になります。ここで、n は Count です。

使用例

StringCollection に新しい要素を追加するコード例を次に示します。

Visual Basic

Imports System
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 'Main

   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 'PrintValues

End Class 'SamplesStringCollection
 


'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
'

C#

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

*/

C++

#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

*/

J#

import System.* ;
import System.Collections.* ;
import System.Collections.Specialized.* ;

public class SamplesStringCollection
{      
    public static void main(String[]
 args)
    {        
        // 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);
    } //main

    public static void PrintValues(IEnumerable
 myCol) 
    {
        Object obj = null;
        IEnumerator objEnum = myCol.GetEnumerator();

        while (objEnum.MoveNext()) { 
            obj = objEnum.get_Current();
            Console.WriteLine("   {0}", obj);
        }

        Console.WriteLine();
    } //PrintValues
} //SamplesStringCollection 

/*
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

*/

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
StringCollection クラス
StringCollection メンバ
System.Collections.Specialized 名前空間
AddRange
IsReadOnly