String.Concat String.Concat String.Concat String.Concat Method

定義

String の 1 つ以上のインスタンス、または String の 1 つ以上のインスタンスの Object 形式の値を連結します。Concatenates one or more instances of String, or the String representations of the values of one or more instances of Object.

オーバーロード

Concat(String, String, String, String) Concat(String, String, String, String) Concat(String, String, String, String) Concat(String, String, String, String)

指定した 4 つの String インスタンスを連結します。Concatenates four specified instances of String.

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>)
Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object)

4 つの指定したオブジェクトと、オプションの可変長パラメーター リストで指定した任意のオブジェクトの文字列表現を連結します。Concatenates the string representations of four specified objects and any objects specified in an optional variable length parameter list.

Concat(String, String, String) Concat(String, String, String) Concat(String, String, String) Concat(String, String, String)

String の指定した 3 つのインスタンスを連結します。Concatenates three specified instances of String.

Concat(Object, Object, Object) Concat(Object, Object, Object) Concat(Object, Object, Object) Concat(Object, Object, Object)

指定した 3 つのオブジェクトの文字列形式を連結します。Concatenates the string representations of three specified objects.

Concat(String, String) Concat(String, String) Concat(String, String) Concat(String, String)

指定した 2 つの String インスタンスを連結します。Concatenates two specified instances of String.

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>)
Concat(Object, Object) Concat(Object, Object) Concat(Object, Object) Concat(Object, Object)

指定した 2 つのオブジェクトの文字列形式を連結します。Concatenates the string representations of two specified objects.

Concat(String[]) Concat(String[]) Concat(String[]) Concat(String[])

指定した String 配列の要素を連結します。Concatenates the elements of a specified String array.

Concat(Object[]) Concat(Object[]) Concat(Object[]) Concat(Object[])

指定された Object 配列の要素の文字列表記を連結します。Concatenates the string representations of the elements in a specified Object array.

Concat(Object) Concat(Object) Concat(Object) Concat(Object)

指定されたオブジェクトの文字列形式を作成します。Creates the string representation of a specified object.

Concat(IEnumerable<String>) Concat(IEnumerable<String>) Concat(IEnumerable<String>) Concat(IEnumerable<String>)

IEnumerable<T> 型の構築された String コレクションのメンバーを連結します。Concatenates the members of a constructed IEnumerable<T> collection of type String.

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>)
Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>)

IEnumerable<T> 実装のメンバーを連結します。Concatenates the members of an IEnumerable<T> implementation.

Concat(String, String, String, String) Concat(String, String, String, String) Concat(String, String, String, String) Concat(String, String, String, String)

指定した 4 つの String インスタンスを連結します。Concatenates four specified instances of String.

public:
 static System::String ^ Concat(System::String ^ str0, System::String ^ str1, System::String ^ str2, System::String ^ str3);
public static string Concat (string str0, string str1, string str2, string str3);
static member Concat : string * string * string * string -> string
Public Shared Function Concat (str0 As String, str1 As String, str2 As String, str3 As String) As String

パラメーター

str0
String String String String

連結する最初の文字列。The first string to concatenate.

str1
String String String String

連結する 2 番目の文字列。The second string to concatenate.

str2
String String String String

連結する 3 番目の文字列。The third string to concatenate.

str3
String String String String

連結する 4 番目の文字列。The fourth string to concatenate.

戻り値

str0str1str2、および str3 の連結。The concatenation of str0, str1, str2, and str3.

次の例では、4 文字の単語の配列を定義し、それらを暗号化するために、個々 の文字を文字列配列を格納します。The following example defines an array of four-letter words and stores their individual letters to a string array in order to scramble them. 呼び出して、Concat(String, String, String, String)スクランブルされた単語を再構成するためのメソッド。It then calls the Concat(String, String, String, String) method to reassemble the scrambled words.

using System;
using System.Collections;

public class Example
{
   public static void Main()
   {
      const int WORD_SIZE = 4;
      
      // Define some 4-letter words to be scrambled.
      string[] words = { "home", "food", "game", "rest" };
      // Define two arrays equal to the number of letters in each word.
      double[] keys = new double[WORD_SIZE];
      string[] letters = new string[WORD_SIZE];
      // Initialize the random number generator.
      Random rnd = new Random();
      
      // Scramble each word.
      foreach (string word in words)
      {
         for (int ctr = 0; ctr < word.Length; ctr++)
         {
            // Populate the array of keys with random numbers.
            keys[ctr] = rnd.NextDouble();
            // Assign a letter to the array of letters.
            letters[ctr] = word[ctr].ToString();
         }   
         // Sort the array. 
         Array.Sort(keys, letters, 0, WORD_SIZE, Comparer.Default);      
         // Display the scrambled word.
         string scrambledWord = String.Concat(letters[0], letters[1], 
                                              letters[2], letters[3]);
         Console.WriteLine("{0} --> {1}", word, scrambledWord);
      } 
   }
}
// The example displays output like the following:
//       home --> mheo
//       food --> oodf
//       game --> aemg
//       rest --> trse
Imports System.Collections

Module Example
   Public Sub Main()
      Const WORD_SIZE As Integer = 4
      
      ' Define some 4-letter words to be scrambled.
      Dim words() As String = { "home", "food", "game", "rest" }
      ' Define two arrays equal to the number of letters in each word.
      Dim keys(WORD_SIZE) As Double
      Dim letters(WORD_SIZE) As String
      ' Initialize the random number generator.
      Dim rnd As New Random()
      
      ' Scramble each word.
      For Each word As String In words
         For ctr As Integer = 0 To word.Length - 1
            ' Populate the array of keys with random numbers.
            keys(ctr) = rnd.NextDouble()
            ' Assign a letter to the array of letters.
            letters(ctr) = word.Chars(ctr)
         Next   
         ' Sort the array. 
         Array.Sort(keys, letters, 0, WORD_SIZE, Comparer.Default)      
         ' Display the scrambled word.
         Dim scrambledWord As String = String.Concat(letters(0), letters(1), _
                                                     letters(2), letters(3))
         Console.WriteLine("{0} --> {1}", word, scrambledWord)
      Next 
   End Sub
End Module 
' The example displays output like the following:
'       home --> mheo
'       food --> oodf
'       game --> aemg
'       rest --> trse

注釈

メソッドを連結しますstr0str1str2、およびstr3; 任意の区切り記号は追加されません。The method concatenates str0, str1, str2, and str3; it does not add any delimiters.

注意

など、言語の文字列の連結演算子を使用することもできます+で c# の場合、または&+Visual basic)。You can also use your language's string concatenation operator, such as + in C#, or & and + in Visual Basic)

、文字列を連結します。, to concatenate strings.

Empty文字列は、配列内の任意の null オブジェクトの代わりに使用されます。An Empty string is used in place of any null object in the array.

こちらもご覧ください

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>)

public:
 static System::String ^ Concat(ReadOnlySpan<char> str0, ReadOnlySpan<char> str1, ReadOnlySpan<char> str2, ReadOnlySpan<char> str3);
public static string Concat (ReadOnlySpan<char> str0, ReadOnlySpan<char> str1, ReadOnlySpan<char> str2, ReadOnlySpan<char> str3);
static member Concat : ReadOnlySpan<char> * ReadOnlySpan<char> * ReadOnlySpan<char> * ReadOnlySpan<char> -> string
Public Shared Function Concat (str0 As ReadOnlySpan(Of Char), str1 As ReadOnlySpan(Of Char), str2 As ReadOnlySpan(Of Char), str3 As ReadOnlySpan(Of Char)) As String

パラメーター

戻り値

Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object) Concat(Object, Object, Object, Object)

重要

この API は CLS 準拠ではありません。

4 つの指定したオブジェクトと、オプションの可変長パラメーター リストで指定した任意のオブジェクトの文字列表現を連結します。Concatenates the string representations of four specified objects and any objects specified in an optional variable length parameter list.

public:
 static System::String ^ Concat(System::Object ^ arg0, System::Object ^ arg1, System::Object ^ arg2, System::Object ^ arg3);
[System.CLSCompliant(false)]
public static string Concat (object arg0, object arg1, object arg2, object arg3);
static member Concat : obj * obj * obj * obj -> string
Public Shared Function Concat (arg0 As Object, arg1 As Object, arg2 As Object, arg3 As Object) As String

パラメーター

arg0
Object Object Object Object

連結する最初のオブジェクト。The first object to concatenate.

arg1
Object Object Object Object

連結する 2 番目のオブジェクト。The second object to concatenate.

arg2
Object Object Object Object

連結する 3 番目のオブジェクト。The third object to concatenate.

arg3
Object Object Object Object

連結する 4 番目のオブジェクト。The fourth object to concatenate.

戻り値

パラメーター リスト内の各値の文字列を連結した結果。The concatenated string representation of each value in the parameter list.

次の例では、使用、Concat(Object, Object, Object, Object)変数のパラメーターのリストを連結するメソッド。The following example illustrates the use of the Concat(Object, Object, Object, Object) method to concatenate a list of variable parameters. この場合、9 個のパラメーターでメソッドが呼び出されます。In this case, the method is called with nine parameters.

using System;
using System.Collections;

public class Example
{
   public static void Main()
   {
      const int WORD_SIZE = 4;
      
      // Define some 4-letter words to be scrambled.
      string[] words = { "home", "food", "game", "rest" };
      // Define two arrays equal to the number of letters in each word.
      double[] keys = new double[WORD_SIZE];
      string[] letters = new string[WORD_SIZE];
      // Initialize the random number generator.
      Random rnd = new Random();
      
      // Scramble each word.
      foreach (string word in words)
      {
         for (int ctr = 0; ctr < word.Length; ctr++)
         {
            // Populate the array of keys with random numbers.
            keys[ctr] = rnd.NextDouble();
            // Assign a letter to the array of letters.
            letters[ctr] = word[ctr].ToString();
         }   
         // Sort the array. 
         Array.Sort(keys, letters, 0, WORD_SIZE, Comparer.Default);      
         // Display the scrambled word.
         string scrambledWord = String.Concat(letters[0], letters[1], 
                                              letters[2], letters[3]);
         Console.WriteLine("{0} --> {1}", word, scrambledWord);
      } 
   }
}
// The example displays output like the following:
//       home --> mheo
//       food --> oodf
//       game --> aemg
//       rest --> trse
Imports System.Collections

Module Example
   Public Sub Main()
      Const WORD_SIZE As Integer = 4
      
      ' Define some 4-letter words to be scrambled.
      Dim words() As String = { "home", "food", "game", "rest" }
      ' Define two arrays equal to the number of letters in each word.
      Dim keys(WORD_SIZE) As Double
      Dim letters(WORD_SIZE) As String
      ' Initialize the random number generator.
      Dim rnd As New Random()
      
      ' Scramble each word.
      For Each word As String In words
         For ctr As Integer = 0 To word.Length - 1
            ' Populate the array of keys with random numbers.
            keys(ctr) = rnd.NextDouble()
            ' Assign a letter to the array of letters.
            letters(ctr) = word.Chars(ctr)
         Next   
         ' Sort the array. 
         Array.Sort(keys, letters, 0, WORD_SIZE, Comparer.Default)      
         ' Display the scrambled word.
         Dim scrambledWord As String = String.Concat(letters(0), letters(1), _
                                                     letters(2), letters(3))
         Console.WriteLine("{0} --> {1}", word, scrambledWord)
      Next 
   End Sub
End Module 
' The example displays output like the following:
'       home --> mheo
'       food --> oodf
'       game --> aemg
'       rest --> trse

注釈

注意

この API は、CLS に準拠していません。This API is not CLS-compliant. CLS 準拠の代わりとして String.Concat(Object[]) を使用できます。The CLS-compliant alternative is String.Concat(Object[]). C# および Visual Basic のコンパイラへの呼び出しとして、このメソッドの呼び出しを自動的に解決String.Concat(Object[])します。The C# and Visual Basic compilers automatically resolve a call to this method as a call to String.Concat(Object[]).

メソッドのパラメーターなしで呼び出すことによって、パラメーター リスト内の各オブジェクトを連結しますToStringメソッド; 任意の区切り記号は追加されません。The method concatenates each object in the parameter list by calling its parameterless ToString method; it does not add any delimiters.

String.Empty null 引数の代わりに使用されます。String.Empty is used in place of any null argument.

注意

最後のパラメーター、Concatメソッドは連結する追加のオブジェクトを 1 つまたは複数の省略可能なコンマ区切りのリスト。The last parameter of the Concat method is an optional comma-delimited list of one or more additional objects to concatenate.

注意 (呼び出し元)

このメソッドが設定されて、varargキーワードで、可変個のパラメーターをサポートしていることを意味します。This method is marked with the vararg keyword, which means that it supports a variable number of parameters. Visual C からメソッドを呼び出すことができますが、c# または Visual Basic コードから呼び出せることはできません。The method can be called from Visual C++, but it cannot be called from C# or Visual Basic code. C# および Visual Basic のコンパイラへの呼び出しを解決するConcat(Object, Object, Object, Object)呼び出しとしてConcat(Object[])します。The C# and Visual Basic compilers resolve calls to Concat(Object, Object, Object, Object) as calls to Concat(Object[]).

Concat(String, String, String) Concat(String, String, String) Concat(String, String, String) Concat(String, String, String)

String の指定した 3 つのインスタンスを連結します。Concatenates three specified instances of String.

public:
 static System::String ^ Concat(System::String ^ str0, System::String ^ str1, System::String ^ str2);
public static string Concat (string str0, string str1, string str2);
static member Concat : string * string * string -> string
Public Shared Function Concat (str0 As String, str1 As String, str2 As String) As String

パラメーター

str0
String String String String

連結する最初の文字列。The first string to concatenate.

str1
String String String String

連結する 2 番目の文字列。The second string to concatenate.

str2
String String String String

連結する 3 番目の文字列。The third string to concatenate.

戻り値

str0str1、および str2 の連結。The concatenation of str0, str1, and str2.

次の例では、Concatメソッドを連結する 3 つの文字列し、結果が表示されます。The following example uses the Concat method to concatenate three strings and displays the result.

using namespace System;

void main()
{
   String^ s1 = "We went to a bookstore, ";
   String^ s2 = "a movie, ";
   String^ s3 = "and a restaurant.";

   String^ s = String::Concat(s1, s2, s3);
   Console::WriteLine(s);
}
// The example displays the following output:
//      We went to a bookstore, a movie, and a restaurant. 
using System;

public class Example
{
   public static void Main()
   {
      String s1 = "We went to a bookstore, ";
      String s2 = "a movie, ";
      String s3 = "and a restaurant.";

      var s = String.Concat(s1, s2, s3);
      Console.WriteLine(s);
   }
}
// The example displays the following output:
//      We went to a bookstore, a movie, and a restaurant. 
Imports System

Public Module Example
   Public Sub Main()
      Dim s1 As String = "We went to a bookstore, "
      Dim s2 As String = "a movie, "
      Dim s3 As String = "and a restaurant."

      Dim s = String.Concat(s1, s2, s3)
      Console.WriteLine(s)
   End Sub
End Module
' The example displays the following output:
'      We went to a bookstore, a movie, and a restaurant. 

注釈

メソッドを連結しますstr0str1、およびstr2; 任意の区切り記号は追加されません。The method concatenates str0, str1, and str2; it does not add any delimiters.

注意

など、言語の文字列の連結演算子を使用することもできます+で c# の場合、または&+Visual basic)。You can also use your language's string concatenation operator, such as + in C#, or & and + in Visual Basic)

、文字列を連結します。, to concatenate strings.

Empty文字列が null のいずれかの引数の代わりに使用されます。An Empty string is used in place of any null argument.

こちらもご覧ください

Concat(Object, Object, Object) Concat(Object, Object, Object) Concat(Object, Object, Object) Concat(Object, Object, Object)

指定した 3 つのオブジェクトの文字列形式を連結します。Concatenates the string representations of three specified objects.

public:
 static System::String ^ Concat(System::Object ^ arg0, System::Object ^ arg1, System::Object ^ arg2);
public static string Concat (object arg0, object arg1, object arg2);
static member Concat : obj * obj * obj -> string
Public Shared Function Concat (arg0 As Object, arg1 As Object, arg2 As Object) As String

パラメーター

arg0
Object Object Object Object

連結する最初のオブジェクト。The first object to concatenate.

arg1
Object Object Object Object

連結する 2 番目のオブジェクト。The second object to concatenate.

arg2
Object Object Object Object

連結する 3 番目のオブジェクト。The third object to concatenate.

戻り値

arg0arg1 および arg2 の値の文字列形式を連結した結果。The concatenated string representations of the values of arg0, arg1, and arg2.

次の例で、Concatメソッド。The following example demonstrates the Concat method.

using namespace System;

int main()
{
   int i = -123;
   Object^ o = i;
   array<Object^>^objs = { -123, -456, -789};
   Console::WriteLine("Concatenate 1, 2, and 3 objects:");
   Console::WriteLine("1) {0}", String::Concat(o));
   Console::WriteLine("2) {0}", String::Concat(o, o));
   Console::WriteLine("3) {0}", String::Concat(o, o, o));
   
   Console::WriteLine("\nConcatenate 4 objects and a variable length parameter list:" );
   Console::WriteLine("4) {0}", String::Concat(o, o, o, o));
   Console::WriteLine("5) {0}", String::Concat( o, o, o, o, o));
   Console::WriteLine("\nConcatenate a 3-element object array:");
   Console::WriteLine("6) {0}", String::Concat(objs));
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
using System;

class stringConcat5 {
    public static void Main() {
    int i = -123;
    Object o = i;
    Object[] objs = new Object[] {-123, -456, -789};

    Console.WriteLine("Concatenate 1, 2, and 3 objects:");
    Console.WriteLine("1) {0}", String.Concat(o));
    Console.WriteLine("2) {0}", String.Concat(o, o));
    Console.WriteLine("3) {0}", String.Concat(o, o, o));

    Console.WriteLine("\nConcatenate 4 objects and a variable length parameter list:");
    Console.WriteLine("4) {0}", String.Concat(o, o, o, o));
    Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o));

    Console.WriteLine("\nConcatenate a 3-element object array:");
    Console.WriteLine("6) {0}", String.Concat(objs));
    }
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
Class stringConcat5
   Public Shared Sub Main()
      Dim i As Integer = - 123
      Dim o As [Object] = i
      Dim objs() As [Object] = {-123, -456, -789}
      
      Console.WriteLine("Concatenate 1, 2, and 3 objects:")
      Console.WriteLine("1) {0}", [String].Concat(o))
      Console.WriteLine("2) {0}", [String].Concat(o, o))
      Console.WriteLine("3) {0}", [String].Concat(o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate 4 objects and a variable length parameter list:")
      Console.WriteLine("4) {0}", String.Concat(o, o, o, o))
      Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate a 3-element object array:")
      Console.WriteLine("6) {0}", [String].Concat(objs))
   End Sub
End Class
'The example displays the following output:
'    Concatenate 1, 2, and 3 objects:
'    1) -123
'    2) -123-123
'    3) -123-123-123
'    
'    Concatenate 4 objects and a variable length parameter list:
'    4) -123-123-123-123
'    5) -123-123-123-123-123
'         
'    Concatenate a 3-element object array:
'    6) -123-456-789

注釈

メソッドを連結しますarg0arg1、およびarg2パラメーターなしで呼び出すことによってToString; 各オブジェクトの任意の区切り記号は追加されません。The method concatenates arg0, arg1, and arg2 by calling the parameterless ToString method of each object; it does not add any delimiters.

String.Empty null 引数の代わりに使用されます。String.Empty is used in place of any null argument.

こちらもご覧ください

Concat(String, String) Concat(String, String) Concat(String, String) Concat(String, String)

指定した 2 つの String インスタンスを連結します。Concatenates two specified instances of String.

public:
 static System::String ^ Concat(System::String ^ str0, System::String ^ str1);
public static string Concat (string str0, string str1);
static member Concat : string * string -> string
Public Shared Function Concat (str0 As String, str1 As String) As String

パラメーター

str0
String String String String

連結する最初の文字列。The first string to concatenate.

str1
String String String String

連結する 2 番目の文字列。The second string to concatenate.

戻り値

str0str1 の連結。The concatenation of str0 and str1.

次の例では、人名、ミドル ネーム、および姓の名前を連結します。The following example concatenates a person's first, middle, and last name.

using namespace System;
int main()
{
   
   // we want to simply quickly add this person's name together
   String^ fName = "Simon";
   String^ mName = "Jake";
   String^ lName = "Harrows";
   
   // because we want a name to appear with a space in between each name, 
   // put a space on the front of the middle, and last name, allowing for
   // the fact that a space may already be there
   mName = String::Concat(  " ", mName->Trim() );
   lName = String::Concat(  " ", lName->Trim() );
   
   // this line simply concatenates the two strings
   Console::WriteLine( "Welcome to this page, '{0}'!", String::Concat( String::Concat( fName, mName ), lName ) );
}
// The example displays the following output:
//        Welcome to this page, 'Simon Jake Harrows'!
using System;

public class ConcatTest {
    public static void Main() {

        // we want to simply quickly add this person's name together
        string fName = "Simon";
        string mName = "Jake";
        string lName = "Harrows";

        // because we want a name to appear with a space in between each name, 
        // put a space on the front of the middle, and last name, allowing for
        // the fact that a space may already be there
        mName = " " + mName.Trim();
        lName = " " + lName.Trim();

        // this line simply concatenates the two strings
        Console.WriteLine("Welcome to this page, '{0}'!", string.Concat( string.Concat(fName, mName), lName ) );
    }
}
// The example displays the following output:
//        Welcome to this page, 'Simon Jake Harrows'!
Public Class ConcatTest
    Public Shared Sub Main()
        Dim fName As String = "Simon"
        Dim mName As String = "Jake"
        Dim lName As String = "Harrows"
        
        ' We want to simply quickly add this person's name together.
        ' Because we want a name to appear with a space in between each name, 
        ' we put a space on the front of the middle, and last name, allowing for
        ' the fact that a space may already be there.
        mName = " " + mName.Trim()
        lName = " " + lName.Trim()
        
        ' This line simply concatenates the two strings.
        Console.WriteLine("Welcome to this page, '{0}'!", _
                          String.Concat(String.Concat(fName, mName), lName))
    End Sub
End Class
' The example displays the following output:
'       Welcome to this page, 'Simon Jake Harrows'!

注釈

メソッドを連結しますstr0str1; 任意の区切り記号は追加されません。The method concatenates str0 and str1; it does not add any delimiters.

注意

など、言語の文字列の連結演算子を使用することもできます+で c# の場合、または&+Visual basic)。You can also use your language's string concatenation operator, such as + in C#, or & and + in Visual Basic)

、文字列を連結します。, to concatenate strings.

Empty文字列が null のいずれかの引数の代わりに使用されます。An Empty string is used in place of any null argument.

こちらもご覧ください

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>, ReadOnlySpan<Char>)

public:
 static System::String ^ Concat(ReadOnlySpan<char> str0, ReadOnlySpan<char> str1, ReadOnlySpan<char> str2);
public static string Concat (ReadOnlySpan<char> str0, ReadOnlySpan<char> str1, ReadOnlySpan<char> str2);
static member Concat : ReadOnlySpan<char> * ReadOnlySpan<char> * ReadOnlySpan<char> -> string
Public Shared Function Concat (str0 As ReadOnlySpan(Of Char), str1 As ReadOnlySpan(Of Char), str2 As ReadOnlySpan(Of Char)) As String

パラメーター

戻り値

Concat(Object, Object) Concat(Object, Object) Concat(Object, Object) Concat(Object, Object)

指定した 2 つのオブジェクトの文字列形式を連結します。Concatenates the string representations of two specified objects.

public:
 static System::String ^ Concat(System::Object ^ arg0, System::Object ^ arg1);
public static string Concat (object arg0, object arg1);
static member Concat : obj * obj -> string
Public Shared Function Concat (arg0 As Object, arg1 As Object) As String

パラメーター

arg0
Object Object Object Object

連結する最初のオブジェクト。The first object to concatenate.

arg1
Object Object Object Object

連結する 2 番目のオブジェクト。The second object to concatenate.

戻り値

arg0 および arg1 の値の文字列形式を連結した結果。The concatenated string representations of the values of arg0 and arg1.

次の例で、Concatメソッド。The following example demonstrates the Concat method.

using namespace System;

int main()
{
   int i = -123;
   Object^ o = i;
   array<Object^>^objs = { -123, -456, -789};
   Console::WriteLine("Concatenate 1, 2, and 3 objects:");
   Console::WriteLine("1) {0}", String::Concat(o));
   Console::WriteLine("2) {0}", String::Concat(o, o));
   Console::WriteLine("3) {0}", String::Concat(o, o, o));
   
   Console::WriteLine("\nConcatenate 4 objects and a variable length parameter list:" );
   Console::WriteLine("4) {0}", String::Concat(o, o, o, o));
   Console::WriteLine("5) {0}", String::Concat( o, o, o, o, o));
   Console::WriteLine("\nConcatenate a 3-element object array:");
   Console::WriteLine("6) {0}", String::Concat(objs));
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
using System;

class stringConcat5 {
    public static void Main() {
    int i = -123;
    Object o = i;
    Object[] objs = new Object[] {-123, -456, -789};

    Console.WriteLine("Concatenate 1, 2, and 3 objects:");
    Console.WriteLine("1) {0}", String.Concat(o));
    Console.WriteLine("2) {0}", String.Concat(o, o));
    Console.WriteLine("3) {0}", String.Concat(o, o, o));

    Console.WriteLine("\nConcatenate 4 objects and a variable length parameter list:");
    Console.WriteLine("4) {0}", String.Concat(o, o, o, o));
    Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o));

    Console.WriteLine("\nConcatenate a 3-element object array:");
    Console.WriteLine("6) {0}", String.Concat(objs));
    }
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
Class stringConcat5
   Public Shared Sub Main()
      Dim i As Integer = - 123
      Dim o As [Object] = i
      Dim objs() As [Object] = {-123, -456, -789}
      
      Console.WriteLine("Concatenate 1, 2, and 3 objects:")
      Console.WriteLine("1) {0}", [String].Concat(o))
      Console.WriteLine("2) {0}", [String].Concat(o, o))
      Console.WriteLine("3) {0}", [String].Concat(o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate 4 objects and a variable length parameter list:")
      Console.WriteLine("4) {0}", String.Concat(o, o, o, o))
      Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate a 3-element object array:")
      Console.WriteLine("6) {0}", [String].Concat(objs))
   End Sub
End Class
'The example displays the following output:
'    Concatenate 1, 2, and 3 objects:
'    1) -123
'    2) -123-123
'    3) -123-123-123
'    
'    Concatenate 4 objects and a variable length parameter list:
'    4) -123-123-123-123
'    5) -123-123-123-123-123
'         
'    Concatenate a 3-element object array:
'    6) -123-456-789

注釈

メソッドを連結しますarg0arg1パラメーターなしで呼び出すことによってToStringメソッドのarg0arg1; 任意の区切り記号は追加されません。The method concatenates arg0 and arg1 by calling the parameterless ToString method of arg0 and arg1; it does not add any delimiters.

String.Empty null 引数の代わりに使用されます。String.Empty is used in place of any null argument.

場合か、引数の配列参照は、メソッドは、そのメンバー (たとえば、"System.String[]") 代わりに、その配列を表す文字列を連結します。If either of the arguments is an array reference, the method concatenates a string representing that array, instead of its members (for example, "System.String[]").

こちらもご覧ください

Concat(String[]) Concat(String[]) Concat(String[]) Concat(String[])

重要

この API は CLS 準拠ではありません。

指定した String 配列の要素を連結します。Concatenates the elements of a specified String array.

public:
 static System::String ^ Concat(... cli::array <System::String ^> ^ values);
[System.CLSCompliant(false)]
public static string Concat (params string[] values);
static member Concat : string[] -> string
Public Shared Function Concat (ParamArray values As String()) As String

パラメーター

values
String[]

文字列インスタンスの配列。An array of string instances.

戻り値

連結された values の要素。The concatenated elements of values.

例外

メモリが不足しています。Out of memory.

次の例では、使用、ConcatメソッドをString配列。The following example demonstrates the use of the Concat method with a String array.

using namespace System;

int main()
{
   
   // Make an array of strings. Note that we have included spaces.
   array<String^>^s = { "hello ", "and ", "welcome ", "to ",
                        "this ", "demo! "};
   
   // Put all the strings together.
   Console::WriteLine( String::Concat(s) );
   
   // Sort the strings, and put them together.
   Array::Sort( s );
   Console::WriteLine( String::Concat(s));
}
// The example displays the following output:
//       hello and welcome to this demo!
//       and demo! hello this to welcome
using System;

public class Example
{
    public static void Main()
    {
        // Make an array of strings. Note that we have included spaces.
        string [] s = { "hello ", "and ", "welcome ", "to ",
                        "this ", "demo! " };

        // Put all the strings together.
        Console.WriteLine(string.Concat(s));

        // Sort the strings, and put them together.
        Array.Sort(s);
        Console.WriteLine(string.Concat(s));
    }
}
// The example displays the following output:
//       hello and welcome to this demo!
//       and demo! hello this to welcome
Public Class Example
    Public Shared Sub Main()
        ' Make an array of strings. Note that we have included spaces.
        Dim s As String() = { "hello ", "and ", "welcome ", "to ",
                              "this ", "demo! "}

        ' Put all the strings together.
        Console.WriteLine(String.Concat(s))
        
        ' Sort the strings, and put them together.
        Array.Sort(s)
        Console.WriteLine(String.Concat(s))
    End Sub
End Class
' The example displays the following output:
'       hello and welcome to this demo!
'       and demo! hello this to welcome

注釈

メソッド内の各オブジェクトを連結するvalues; 任意の区切り記号は追加されません。The method concatenates each object in values; it does not add any delimiters.

Empty文字列は、配列内の任意の null オブジェクトの代わりに使用されます。An Empty string is used in place of any null object in the array.

こちらもご覧ください

Concat(Object[]) Concat(Object[]) Concat(Object[]) Concat(Object[])

指定された Object 配列の要素の文字列表記を連結します。Concatenates the string representations of the elements in a specified Object array.

public:
 static System::String ^ Concat(... cli::array <System::Object ^> ^ args);
public static string Concat (params object[] args);
static member Concat : obj[] -> string
Public Shared Function Concat (ParamArray args As Object()) As String

パラメーター

args
Object[]

連結する要素を格納しているオブジェクト配列。An object array that contains the elements to concatenate.

戻り値

args の各要素の値を連結した文字列表記。The concatenated string representations of the values of the elements in args.

例外

メモリが不足しています。Out of memory.

次の例では、使用、ConcatメソッドをObject配列。The following example demonstrates the use of the Concat method with an Object array.

using System;

public class ConcatTest {
    public static void Main() {
        // Create a group of objects.
        Test1 t1 = new Test1();
        Test2 t2 = new Test2();
        int i = 16;
        string s = "Demonstration";

        // Place the objects in an array.
        object [] o = { t1, i, t2, s };

        // Concatenate the objects together as a string. To do this,
        // the ToString method of each of the objects is called.
        Console.WriteLine(string.Concat(o));
    }
}

// Create two empty test classes.
class Test1 {
}

class Test2 {
}
// The example displays the following output:
//       Test116Test2Demonstration
Imports System



Public Class ConcatTest
    
    Public Shared Sub Main()
        Dim t1 As New Test1()
        Dim t2 As New Test2()
        Dim i As Integer = 16
        Dim s As String = "Demonstration"
        Dim o As Object() = {t1, i, t2, s}
        
        ' create a group of objects
        
        ' place the objects in an array
        
        ' concatenate the objects together as a string. To do this,
        ' the ToString method in the objects is called
        Console.WriteLine(String.Concat(o))
    End Sub 'Main
End Class 'ConcatTest


' imagine these test classes are full-fledged objects...
Class Test1
End Class 'Test1

Class Test2
End Class 'Test2

注釈

メソッド内の各オブジェクトを連結するargsパラメーターなしで呼び出すことによってToString; オブジェクトのメソッドの区切り記号は追加されません。The method concatenates each object in args by calling the parameterless ToString method of that object; it does not add any delimiters.

String.Empty 配列内の任意の null オブジェクトの代わりに使用されます。String.Empty is used in place of any null object in the array.

注意 (呼び出し元)

このメソッドは、C++ コードでは呼び出されません。This method is not called by C++ code. C++ コンパイラへの呼び出しを解決するConcatへの呼び出しとして 4 つ以上のオブジェクト パラメーターがあるConcat(Object, Object, Object, Object)します。The C++ compiler resolves calls to Concat that have four or more object parameters as a call to Concat(Object, Object, Object, Object).

こちらもご覧ください

Concat(Object) Concat(Object) Concat(Object) Concat(Object)

指定されたオブジェクトの文字列形式を作成します。Creates the string representation of a specified object.

public:
 static System::String ^ Concat(System::Object ^ arg0);
public static string Concat (object arg0);
static member Concat : obj -> string
Public Shared Function Concat (arg0 As Object) As String

パラメーター

arg0
Object Object Object Object

表現するオブジェクトまたは nullThe object to represent, or null.

戻り値

arg0 の値の文字列形式。Emptyarg0 の場合は nullThe string representation of the value of arg0, or Empty if arg0 is null.

次の例で、Concatメソッド。The following example demonstrates the Concat method.

using namespace System;

int main()
{
   int i = -123;
   Object^ o = i;
   array<Object^>^objs = { -123, -456, -789};
   Console::WriteLine("Concatenate 1, 2, and 3 objects:");
   Console::WriteLine("1) {0}", String::Concat(o));
   Console::WriteLine("2) {0}", String::Concat(o, o));
   Console::WriteLine("3) {0}", String::Concat(o, o, o));
   
   Console::WriteLine("\nConcatenate 4 objects and a variable length parameter list:" );
   Console::WriteLine("4) {0}", String::Concat(o, o, o, o));
   Console::WriteLine("5) {0}", String::Concat( o, o, o, o, o));
   Console::WriteLine("\nConcatenate a 3-element object array:");
   Console::WriteLine("6) {0}", String::Concat(objs));
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
using System;

class stringConcat5 {
    public static void Main() {
    int i = -123;
    Object o = i;
    Object[] objs = new Object[] {-123, -456, -789};

    Console.WriteLine("Concatenate 1, 2, and 3 objects:");
    Console.WriteLine("1) {0}", String.Concat(o));
    Console.WriteLine("2) {0}", String.Concat(o, o));
    Console.WriteLine("3) {0}", String.Concat(o, o, o));

    Console.WriteLine("\nConcatenate 4 objects and a variable length parameter list:");
    Console.WriteLine("4) {0}", String.Concat(o, o, o, o));
    Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o));

    Console.WriteLine("\nConcatenate a 3-element object array:");
    Console.WriteLine("6) {0}", String.Concat(objs));
    }
}
// The example displays the following output:
//    Concatenate 1, 2, and 3 objects:
//    1) -123
//    2) -123-123
//    3) -123-123-123
//    
//    Concatenate 4 objects and a variable length parameter list:
//    4) -123-123-123-123
//    5) -123-123-123-123-123
//    
//    Concatenate a 3-element object array:
//    6) -123-456-789
Class stringConcat5
   Public Shared Sub Main()
      Dim i As Integer = - 123
      Dim o As [Object] = i
      Dim objs() As [Object] = {-123, -456, -789}
      
      Console.WriteLine("Concatenate 1, 2, and 3 objects:")
      Console.WriteLine("1) {0}", [String].Concat(o))
      Console.WriteLine("2) {0}", [String].Concat(o, o))
      Console.WriteLine("3) {0}", [String].Concat(o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate 4 objects and a variable length parameter list:")
      Console.WriteLine("4) {0}", String.Concat(o, o, o, o))
      Console.WriteLine("5) {0}", String.Concat(o, o, o, o, o))
      
      Console.WriteLine(vbCrLf & "Concatenate a 3-element object array:")
      Console.WriteLine("6) {0}", [String].Concat(objs))
   End Sub
End Class
'The example displays the following output:
'    Concatenate 1, 2, and 3 objects:
'    1) -123
'    2) -123-123
'    3) -123-123-123
'    
'    Concatenate 4 objects and a variable length parameter list:
'    4) -123-123-123-123
'    5) -123-123-123-123-123
'         
'    Concatenate a 3-element object array:
'    6) -123-456-789

注釈

Concat(Object)メソッドを表しますarg0を呼び出して、パラメーターなしの文字列としてToStringメソッド。The Concat(Object) method represents arg0 as a string by calling its parameterless ToString method.

こちらもご覧ください

Concat(IEnumerable<String>) Concat(IEnumerable<String>) Concat(IEnumerable<String>) Concat(IEnumerable<String>)

IEnumerable<T> 型の構築された String コレクションのメンバーを連結します。Concatenates the members of a constructed IEnumerable<T> collection of type String.

public:
 static System::String ^ Concat(System::Collections::Generic::IEnumerable<System::String ^> ^ values);
[System.Runtime.InteropServices.ComVisible(false)]
public static string Concat (System.Collections.Generic.IEnumerable<string> values);
static member Concat : seq<string> -> string
Public Shared Function Concat (values As IEnumerable(Of String)) As String

パラメーター

values
IEnumerable<String>

IEnumerable<T> を実装し、ジェネリック型引数が String であるコレクション オブジェクト。A collection object that implements IEnumerable<T> and whose generic type argument is String.

戻り値

values 内の文字列の連結結果。または、values が空の IEnumerable(Of String) である場合は EmptyThe concatenated strings in values, or Empty if values is an empty IEnumerable(Of String).

例外

次の例では、エラトステネスの篩というアルゴリズムを使用して、100 小さい素数を計算します。The following example uses the Sieve of Eratosthenes algorithm to calculate the prime numbers that are less than or equal to 100. 結果を割り当てます、List<T>型のオブジェクトString、しに渡されます、Concat(IEnumerable<String>)メソッド。It assigns the result to a List<T> object of type String, which it then passes to the Concat(IEnumerable<String>) method.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      int maxPrime = 100;
      IEnumerable<String> primeList = GetPrimes(maxPrime);
      Console.WriteLine("Primes less than {0}:", maxPrime);
      Console.WriteLine("   {0}", String.Concat(primeList));
   }

   private static IEnumerable<String> GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 }); 
      // Use Sieve of Erathsthenes to determine prime numbers.
      for (int ctr = values.GetLowerBound(0); ctr <= (int) Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))); ctr++)
      {
                           
         if ((int) values.GetValue(ctr) == 1) continue;
         
         for (int multiplier = ctr; multiplier <=  maxPrime / 2; multiplier++)
            if (ctr * multiplier <= maxPrime)
               values.SetValue(1, ctr * multiplier);
      }      
      
      List<String> primes = new List<String>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr.ToString() + " ");
      return primes;
   }   
}
// The example displays the following output:
//    Primes less than 100:
//       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Imports System.Collections.Generic

Module Example
   Public Sub Main()
      Dim maxPrime As Integer = 100
      Dim primeList As IEnumerable(Of String) = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Concat(primeList))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As IEnumerable(Of String)
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
      ' Use Sieve of Erathsthenes to determine prime numbers.
      For ctr As Integer = values.GetLowerBound(0) To _
                           CInt(Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))))
         If CInt(values.GetValue(ctr)) = 1 Then Continue For
         
         For multiplier As Integer = ctr To maxPrime \ 2
            If ctr * multiplier <= maxPrime Then values.SetValue(1, ctr * multiplier)
         Next   
      Next      
      
      Dim primes As New List(Of String)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr.ToString() + " ")
      Next            
      Return primes
   End Function   
End Module
' The example displays the following output:
'    Primes less than 100:
'       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

注釈

メソッド内の各オブジェクトを連結するvalues; 任意の区切り記号は追加されません。The method concatenates each object in values; it does not add any delimiters. 各メンバー間の区切り記号を指定するvaluesを呼び出し、Join(String, IEnumerable<String>)メソッド。To specify a delimiter between each member of values, call the Join(String, IEnumerable<String>) method.

Emptyで任意の null 要素の代わりに文字列が使用されるvaluesします。An Empty string is used in place of any null element in values.

場合valuesは、空IEnumerable(Of String)、メソッドを返しますString.Emptyします。If values is an empty IEnumerable(Of String), the method returns String.Empty. 場合valuesnullがスローされます、ArgumentNullException例外。If values is null, the method throws an ArgumentNullException exception.

Concat(IEnumerable<String>) 便利なメソッド内の各要素を連結することができますが、IEnumerable(Of String)文字列配列に要素を変換しなくてもコレクション。Concat(IEnumerable<String>) is a convenience method that lets you concatenate each element in an IEnumerable(Of String) collection without first converting the elements to a string array. 統合言語クエリ (LINQ) のクエリ式で特に便利です。It is particularly useful with Language-Integrated Query (LINQ) query expressions. 次の例では、List(Of String)と等しいか (つまり、例では、"M")、特定の文字を超える文字を選択するラムダ式にアルファベットの大文字または小文字の文字を含むオブジェクト。The following example passes a List(Of String) object that contains either the uppercase or lowercase letters of the alphabet to a lambda expression that selects letters that are equal to or greater than a particular letter (which, in the example, is "M"). IEnumerable(Of String)によって返されるコレクション、Enumerable.Whereにメソッドが渡される、Concat(IEnumerable<String>)メソッドを 1 つの文字列として結果を表示します。The IEnumerable(Of String) collection that is returned by the Enumerable.Where method is passed to the Concat(IEnumerable<String>) method to display the result as a single string.

using System;
using System.Collections.Generic;
using System.Linq;

public class Example
{
   public static void Main()
   {
      string output = String.Concat( GetAlphabet(true).Where( letter => 
                      letter.CompareTo("M") >= 0));
      Console.WriteLine(output);  
   }

   private static List<string> GetAlphabet(bool upper)
   {
      List<string> alphabet = new List<string>();
      int charValue = upper ? 65 : 97;
      for (int ctr = 0; ctr <= 25; ctr++)
         alphabet.Add(Convert.ToChar(charValue + ctr).ToString());
      return alphabet; 
   }
}
// The example displays the following output:
//      MNOPQRSTUVWXYZ
Imports System.Collections.Generic
Imports System.Linq

Module modMain
   Public Sub Main()
      Dim output As String = String.Concat(GetAlphabet(true).Where(Function(letter) _
                                                         letter >= "M"))
        
      Console.WriteLine(output)                                     
   End Sub
   
   Private Function GetAlphabet(upper As Boolean) As List(Of String)
      Dim alphabet As New List(Of String)
      Dim charValue As Integer = CInt(IIf(upper, 65, 97))
      For ctr As Integer = 0 To 25
         alphabet.Add(ChrW(charValue + ctr).ToString())
      Next
      Return alphabet 
   End Function
End Module
' The example displays the following output:
'       MNOPQRSTUVWXYZ

Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>) Concat(ReadOnlySpan<Char>, ReadOnlySpan<Char>)

public:
 static System::String ^ Concat(ReadOnlySpan<char> str0, ReadOnlySpan<char> str1);
public static string Concat (ReadOnlySpan<char> str0, ReadOnlySpan<char> str1);
static member Concat : ReadOnlySpan<char> * ReadOnlySpan<char> -> string
Public Shared Function Concat (str0 As ReadOnlySpan(Of Char), str1 As ReadOnlySpan(Of Char)) As String

パラメーター

戻り値

Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>) Concat<T>(IEnumerable<T>)

IEnumerable<T> 実装のメンバーを連結します。Concatenates the members of an IEnumerable<T> implementation.

public:
generic <typename T>
 static System::String ^ Concat(System::Collections::Generic::IEnumerable<T> ^ values);
[System.Runtime.InteropServices.ComVisible(false)]
public static string Concat<T> (System.Collections.Generic.IEnumerable<T> values);
static member Concat : seq<'T> -> string
Public Shared Function Concat(Of T) (values As IEnumerable(Of T)) As String

型パラメーター

T

values のメンバーの型。The type of the members of values.

パラメーター

values
IEnumerable<T> IEnumerable<T> IEnumerable<T> IEnumerable<T>

IEnumerable<T> インターフェイスを実装するコレクション オブジェクト。A collection object that implements the IEnumerable<T> interface.

戻り値

values 内のメンバーの連結結果。The concatenated members in values.

例外

次の例は非常に単純な定義Animalanimal クラスとが所属する順序の名前を表すクラス。The following example defines a very simple Animal class that contains the name of an animal and the order to which it belongs. 定義し、List<T>の数を格納するオブジェクトAnimalオブジェクト。It then defines a List<T> object to contain a number of Animal objects. Enumerable.Whereを抽出する拡張メソッドが呼び出される、AnimalオブジェクトOrderプロパティが「げっ歯類」に等しい。The Enumerable.Where extension method is called to extract the Animal objects whose Order property equals "Rodent". 結果が渡される、Concat<T>(IEnumerable<T>)メソッドと、コンソールに表示されます。The result is passed to the Concat<T>(IEnumerable<T>) method and displayed to the console.

using System;
using System.Collections.Generic;
using System.Linq;

public class Animal
{
   public string Kind;
   public string Order;
   
   public Animal(string kind, string order)
   {
      this.Kind = kind;
      this.Order = order;
   }
   
   public override string ToString()
   {
      return this.Kind;
   }
}

public class Example
{
   public static void Main()
   {
      List<Animal> animals = new List<Animal>();
      animals.Add(new Animal("Squirrel", "Rodent"));
      animals.Add(new Animal("Gray Wolf", "Carnivora"));
      animals.Add(new Animal("Capybara", "Rodent"));
      string output = String.Concat(animals.Where( animal => 
                      (animal.Order == "Rodent")));
      Console.WriteLine(output);  
   }
}
// The example displays the following output:
//      SquirrelCapybara
Imports System.Collections.Generic

Public Class Animal
   Public Kind As String
   Public Order As String
   
   Public Sub New(kind As String, order As String)
      Me.Kind = kind
      Me.Order = order
   End Sub
   
   Public Overrides Function ToString() As String
      Return Me.Kind
   End Function
End Class

Module Example
   Public Sub Main()
      Dim animals As New List(Of Animal)
      animals.Add(New Animal("Squirrel", "Rodent"))
      animals.Add(New Animal("Gray Wolf", "Carnivora"))
      animals.Add(New Animal("Capybara", "Rodent")) 
      Dim output As String = String.Concat(animals.Where(Function(animal) _
                                           animal.Order = "Rodent"))
      Console.WriteLine(output)                                           
   End Sub
End Module
' The example displays the following output:
'      SquirrelCapybara

注釈

メソッド内の各オブジェクトを連結するvalues; 任意の区切り記号は追加されません。The method concatenates each object in values; it does not add any delimiters.

Empty文字列が null のいずれかの引数の代わりに使用されます。An Empty string is used in place of any null argument.

Concat<T>(IEnumerable<T>) 便利なメソッド内の各要素を連結することができますが、IEnumerable<T>文字列に要素を変換しなくてもコレクション。Concat<T>(IEnumerable<T>) is a convenience method that lets you concatenate each element in an IEnumerable<T> collection without first converting the elements to strings. 例に示すように、統合言語クエリ (LINQ) のクエリ式で特に便利です。It is particularly useful with Language-Integrated Query (LINQ) query expressions, as the example illustrates. 内の各オブジェクトの文字列表現、IEnumerable<T>呼び出して、そのオブジェクトのコレクションは派生ToStringメソッド。The string representation of each object in the IEnumerable<T> collection is derived by calling that object's ToString method.

適用対象