String.TrimStart メソッド

.NET Framework クラス ライブラリ リファレンス

String.TrimStart メソッド

このインスタンスの先頭から、配列で指定された文字セットをすべて削除します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Function TrimStart ( _
    ParamArray trimChars As Char()
 _
) As String

Visual Basic (使用法)

Dim instance As String
Dim trimChars As Char()
Dim returnValue As String

returnValue = instance.TrimStart(trimChars)

C#

public string TrimStart (
    params char[] trimChars
)

C++

public:
String^ TrimStart (
    ... array<wchar_t>^ trimChars
)

J#

public String TrimStart (
    char[] trimChars
)

JScript

public function TrimStart (
    ... trimChars : char[]
) : String

パラメータ

trimChars

削除する Unicode 文字の配列、または null 参照 (Visual Basic では Nothing)。

戻り値
出現する trimChars の文字を先頭からすべて削除した後の String。trimChars が null 参照 (Visual Basic では Nothing) の場合は、代わりに空白文字が削除されます。

解説

どの Unicode 文字が空白文字として分類されているかの詳細については、Trim メソッド オーバーロードの「解説」を参照してください。

使用例

TrimStart メソッド オーバーロードを使用して、文字列の先頭から空白やその他の文字を削除する方法については、次のコード例を参照してください。

Visual Basic

Imports System

Public Class TrimTest
    
    Public Shared Sub Main()
        Dim temp As String()
 = MakeArray()
        
        
        Console.WriteLine("Concatenating the inital values in
 the array, we get the string:")
        Console.WriteLine("'{0}'{1}", [String].Concat(temp),
 Environment.NewLine)
        Dim i As Integer
        
        ' trim whitespace from both ends of the elements
        For i = 0 To temp.Length - 1
            temp(i) = temp(i).Trim()
        
        Next i
        Console.WriteLine("Concatenating the trimmed values in
 the array, we get the string:")
        Console.WriteLine("'{0}'{1}", [String].Concat(temp),
 Environment.NewLine)
        
        ' reset the array
        temp = MakeArray()
        
        ' trim the start of the elements. Passing null trims whitespace
 only
        For i = 0 To temp.Length - 1
            temp(i) = temp(i).TrimStart(" "c)
        Next i

        Console.WriteLine("Concatenating the start-trimmed values
 in the array, we get the string:")
        Console.WriteLine("'{0}'{1}", [String].Concat(temp),
 Environment.NewLine)

        ' reset the array
        temp = MakeArray()

        ' trim the end of the elements. Passing null trims whitespace
 only
        For i = 0 To temp.Length - 1
            temp(i) = temp(i).TrimEnd(" "c)
        Next i

        Console.WriteLine("Concatenating the end-trimmed values
 in the array, we get the string:")
        Console.WriteLine("'{0}'", [String].Concat(temp))
    End Sub 'Main

    Private Shared Function
 MakeArray() As String()
        Dim arr As String()
 = {"  please    ", "  tell  
  ", "  me    ", "  about    ", "  yourself    "}
        Return arr
    End Function 'MakeArray
End Class 'TrimTest

C#

using System;

public class TrimTest {
    public static void Main()
 {

        string [] temp = MakeArray();

        Console.WriteLine("Concatenating the inital values in
 the array, we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // trim whitespace from both ends of the elements
        for (int i = 0; i < temp.Length;
 i++)
            temp[i] = temp[i].Trim();

        Console.WriteLine("Concatenating the trimmed values in
 the array, we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // reset the array
        temp = MakeArray();

        // trim the start of the elements. Passing null trims whitespace
 only
        for (int i = 0; i < temp.Length;
 i++)
            temp[i] = temp[i].TrimStart(null);

        Console.WriteLine("Concatenating the start-trimmed values in
 the array, we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // reset the array
        temp = MakeArray();

        // trim the end of the elements. Passing null trims whitespace
 only
        for (int i = 0; i < temp.Length;
 i++)
            temp[i] = temp[i].TrimEnd(null);

        Console.WriteLine("Concatenating the end-trimmed values in
 the array, we get the string:");
        Console.WriteLine("'{0}'", String.Concat(temp));
    }

    private static string
 [] MakeArray() {
        string [] arr = {"  please    ", "  tell
    ", "  me    ", "  about    ", "  yourself    "};
        return arr;
    }
}

C++

using namespace System;

array<String^>^ MakeArray()
{
   array<String^>^arr = {"  please    ","  tell    ","
  me    ","  about    ","  yourself    "};
   return arr;
}

int main()
{
   array<String^>^temp = MakeArray();
   Console::WriteLine( "Concatenating the inital values in
 the array, we get the string:" );
   Console::WriteLine( "'{0}'\n", String::Concat( temp ) );

   // trim whitespace from both ends of the elements
   for ( int i = 0; i < temp->Length;
 i++ )
      temp[ i ] = temp[ i ]->Trim();
   Console::WriteLine( "Concatenating the trimmed values in
 the array, we get the string:" );
   Console::WriteLine( "'{0}'", String::Concat( temp ) );

   // reset the array
   temp = MakeArray();

   // trim the start of the elements-> Passing 0 trims whitespace
 only
   for ( int i = 0; i < temp->Length;
 i++ )
      temp[ i ] = temp[ i ]->TrimStart( 0 );
   Console::WriteLine( "Concatenating the start-trimmed values in
 the array, we get the string:" );
   Console::WriteLine( "'{0}'\n", String::Concat( temp ) );

   // reset the array
   temp = MakeArray();

   // trim the end of the elements-> Passing 0 trims whitespace only
   for ( int i = 0; i < temp->Length;
 i++ )
      temp[ i ] = temp[ i ]->TrimEnd( 0 );
   Console::WriteLine( "Concatenating the end-trimmed values in
 the array, we get the string:" );
   Console::WriteLine( "'{0}'", String::Concat( temp ) );
}

J#

import System.*;

public class TrimTest
{
    public static void main(String[]
 args)
    {
        String temp[] = MakeArray();

        Console.WriteLine("Concatenating the inital values in
 the array," 
            + " we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp),
            Environment.get_NewLine());
        // trim whitespace from both ends of the elements
        for (int i = 0; i < temp.get_Length();
 i++) {
            temp.set_Item(i, temp[i].Trim());
        }
        Console.WriteLine("Concatenating the trimmed values in
 the array," 
            + " we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), 
            Environment.get_NewLine());
        // reset the array
        temp = MakeArray();
        // trim the start of the elements. Passing null trims whitespace
 only
        for (int i = 0; i < temp.get_Length();
 i++) {
            temp.set_Item(i, temp[i].TrimStart(null));
        }
        Console.WriteLine("Concatenating the start-trimmed values in
 the " 
            + "array, we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), 
            Environment.get_NewLine());
        // reset the array
        temp = MakeArray();
        // trim the end of the elements. Passing null trims whitespace
 only
        for (int i = 0; i < temp.get_Length();
 i++) {
            temp.set_Item(i, temp[i].TrimEnd(null));
        }
        Console.WriteLine("Concatenating the end-trimmed values in
 the array," 
            + " we get the string:");
        Console.WriteLine("'{0}'", String.Concat(temp));
    } //main

    private static String[] MakeArray()
    {
        String arr[] =  { "  please    ", "  tell    ", "
  me    ", 
            "  about    ", "  yourself    " };
        return arr;
    } //MakeArray
} //TrimTest

JScript

import System;

public class TrimTest {
    public static function
 Main() : void {

        var temp : String [] = MakeArray();

        Console.WriteLine("Concatenating the inital values in the array, we
 get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // trim whitespace from both ends of the elements
        for (var i : int
 = 0; i < temp.Length; i++)
            temp[i] = temp[i].Trim();

        Console.WriteLine("Concatenating the trimmed values in the array, we
 get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // reset the array
        temp = MakeArray();

    var c : char[] = undefined;

        // trim the start of the elements. Passing null trims whitespace
 only
        for (i = 0; i < temp.Length; i++)
            temp[i] = temp[i].TrimStart(c);

        Console.WriteLine("Concatenating the start-trimmed values in the array,
 we get the string:");
        Console.WriteLine("'{0}'{1}", String.Concat(temp), Environment.NewLine);

        // reset the array
        temp = MakeArray();

        // trim the end of the elements. Passing null trims whitespace
 only
        for (i = 0; i < temp.Length; i++)
            temp[i] = temp[i].TrimEnd(c);

        Console.WriteLine("Concatenating the end-trimmed values in the array,
 we get the string:");
        Console.WriteLine("'{0}'", String.Concat(temp));
    }

    private static function
 MakeArray() : String [] {
        var arr : String [] = ["  please    ", "
  tell    ", "  me    ", "  about    ", "  yourself
    "];
        return arr;
    }
}
TrimTest.Main();

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
String クラス
String メンバ
System 名前空間
Char 構造体
Trim
TrimEnd