String.Join 메서드

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(System::String ^ separator, ... cli::array <System::String ^> ^ value);

public:
 static System::String ^ Join(System::String ^ separator, cli::array <System::String ^> ^ value);

public static string Join (string separator, params string[] value);

public static string Join (string? separator, params string?[] value);

public static string Join (string separator, string[] value);

static member Join : string * string[] -> string

Public Shared Function Join (separator As String, ParamArray value As String()) As String

Public Shared Function Join (separator As String, value As String()) As String

매개 변수

반환

separator 문자열로 구분된 value 요소로 구성된 문자열입니다.

-또는-

value 요소가 0이면 Empty.

예외

예제

다음 예제에서는 Join 메서드를 보여 줍니다.

using namespace System;
String^ MakeLine( int initVal, int multVal, String^ sep )
{
   array<String^>^sArr = gcnew array<String^>(10);
   for ( int i = initVal; i < initVal + 10; i++ )
      sArr[ i - initVal ] = String::Format( "{0, -3}", i * multVal );
   return String::Join( sep, sArr );
}

int main()
{
   Console::WriteLine( MakeLine( 0, 5, ", " ) );
   Console::WriteLine( MakeLine( 1, 6, "  " ) );
   Console::WriteLine( MakeLine( 9, 9, ": " ) );
   Console::WriteLine( MakeLine( 4, 7, "< " ) );
}
// The example displays the following output:
//       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
//       6    12   18   24   30   36   42   48   54   60
//       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
//       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91

using System;

public class JoinTest
{
    public static void Main()
    {
        Console.WriteLine(MakeLine(0, 5, ", "));
        Console.WriteLine(MakeLine(1, 6, "  "));
        Console.WriteLine(MakeLine(9, 9, ": "));
        Console.WriteLine(MakeLine(4, 7, "< "));
    }

    private static string MakeLine(int initVal, int multVal, string sep)
    {
        string [] sArr = new string [10];

        for (int i = initVal; i < initVal + 10; i++)
            sArr[i - initVal] = String.Format("{0,-3}", i * multVal);

        return String.Join(sep, sArr);
    }
}
// The example displays the following output:
//       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
//       6    12   18   24   30   36   42   48   54   60
//       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
//       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91

open System

let makeLine initVal multVal (sep: string) =
    let sArr = Array.zeroCreate<string> 10 

    for i = initVal to initVal + 9 do
        sArr[i - initVal] <- String.Format("{0,-3}", i * multVal)

    String.Join(sep, sArr)

printfn $"""{makeLine 0 5 ", "}"""
printfn $"""{makeLine 1 6 "  "}"""
printfn $"""{makeLine 9 9 ": "}"""
printfn $"""{makeLine 4 7 "< "}"""

// The example displays the following output:
//       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
//       6    12   18   24   30   36   42   48   54   60
//       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
//       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91

Public Class JoinTest
    
    Public Shared Sub Main()
        
        Console.WriteLine(MakeLine(0, 5, ", "))
        Console.WriteLine(MakeLine(1, 6, "  "))
        Console.WriteLine(MakeLine(9, 9, ": "))
        Console.WriteLine(MakeLine(4, 7, "< "))
    End Sub
    
    
    Private Shared Function MakeLine(initVal As Integer, multVal As Integer, sep As String) As String
        Dim sArr(10) As String
        Dim i As Integer
        
        
        For i = initVal To (initVal + 10) - 1
            sArr((i - initVal)) = [String].Format("{0,-3}", i * multVal)
        
        Next i
        Return [String].Join(sep, sArr)
    End Function 'MakeLine
End Class
' The example displays the following output:
'       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
'       6    12   18   24   30   36   42   48   54   60
'       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
'       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91

설명

예를 들어 separator ", "이고 value 요소가 "apple", "orange", "grape" 및 "pear"이면 Join(separator, value) "apple, orange, grape, pear"를 반환합니다.

separator null경우 빈 문자열(String.Empty)이 대신 사용됩니다. value 요소가 null경우 빈 문자열이 대신 사용됩니다.

추가 정보

• Concat(Object)

public:
 static System::String ^ Join(System::String ^ separator, ReadOnlySpan<System::String ^> value);

public static string Join (string? separator, scoped ReadOnlySpan<string?> value);

static member Join : string * ReadOnlySpan<string> -> string

Public Shared Function Join (separator As String, value As ReadOnlySpan(Of String)) As String

매개 변수

반환

separator 문자열로 구분된 value 요소로 구성된 문자열입니다. -또는- value 요소가 0이면 Empty.

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(System::String ^ separator, cli::array <System::String ^> ^ value, int startIndex, int count);

public static string Join (string separator, string[] value, int startIndex, int count);

public static string Join (string? separator, string?[] value, int startIndex, int count);

static member Join : string * string[] * int * int -> string

Public Shared Function Join (separator As String, value As String(), startIndex As Integer, count As Integer) As String

매개 변수

반환

separator 문자로 구분된 startIndex 시작하는 valuecount 요소로 구성된 문자열입니다.

-또는-

count 0이면 Empty.

예외

예제

다음 예제에서는 과일 이름 배열의 두 요소를 연결합니다.

// Sample for String::Join(String, String[], int int)
using namespace System;
int main()
{
   array<String^>^val = {"apple","orange","grape","pear"};
   String^ sep = ", ";
   String^ result;
   Console::WriteLine( "sep = '{0}'", sep );
   Console::WriteLine( "val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[ 0 ], val[ 1 ], val[ 2 ], val[ 3 ] );
   result = String::Join( sep, val, 1, 2 );
   Console::WriteLine( "String::Join(sep, val, 1, 2) = '{0}'", result );
}

/*
This example produces the following results:
sep = ', '
val[] = {'apple' 'orange' 'grape' 'pear'}
String::Join(sep, val, 1, 2) = 'orange, grape'
*/

String[] val = {"apple", "orange", "grape", "pear"};
String sep   = ", ";
String result;

Console.WriteLine("sep = '{0}'", sep);
Console.WriteLine("val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[0], val[1], val[2], val[3]);
result = String.Join(sep, val, 1, 2);
Console.WriteLine("String.Join(sep, val, 1, 2) = '{0}'", result);

// This example produces the following results:
// sep = ', '
// val[] = {'apple' 'orange' 'grape' 'pear'}
// String.Join(sep, val, 1, 2) = 'orange, grape'

open System

let vals = [| "apple"; "orange"; "grape"; "pear" |]
let sep   = ", "

printfn $"sep = '{sep}'"
printfn $"vals[] = {{'{vals[0]}' '{vals[1]}' '{vals[2]}' '{vals[3]}'}}"
let result = String.Join(sep, vals, 1, 2)
printfn $"String.Join(sep, vals, 1, 2) = '{result}'"

// This example produces the following results:
// sep = ', '
// vals[] = {'apple' 'orange' 'grape' 'pear'}
// String.Join(sep, vals, 1, 2) = 'orange, grape'

Class Sample
   Public Shared Sub Main()
      Dim val As [String]() =  {"apple", "orange", "grape", "pear"}
      Dim sep As [String] = ", "
      Dim result As [String]
      
      Console.WriteLine("sep = '{0}'", sep)
      Console.WriteLine("val() = {{'{0}' '{1}' '{2}' '{3}'}}", val(0), val(1), val(2), val(3))
      result = [String].Join(sep, val, 1, 2)
      Console.WriteLine("String.Join(sep, val, 1, 2) = '{0}'", result)
   End Sub
End Class 
'This example displays the following output:
'       sep = ', '
'       val() = {'apple' 'orange' 'grape' 'pear'}
'       String.Join(sep, val, 1, 2) = 'orange, grape'

설명

예를 들어 separator ", "이고 value 요소가 "apple", "orange", "grape" 및 "pear"이면 Join(separator, value, 1, 2) "orange, grape"를 반환합니다.

separator null경우 빈 문자열(String.Empty)이 대신 사용됩니다. value 요소가 null경우 빈 문자열이 대신 사용됩니다.

추가 정보

• Split(Char[])

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(char separator, cli::array <System::String ^> ^ value, int startIndex, int count);

public static string Join (char separator, string?[] value, int startIndex, int count);

public static string Join (char separator, string[] value, int startIndex, int count);

static member Join : char * string[] * int * int -> string

Public Shared Function Join (separator As Char, value As String(), startIndex As Integer, count As Integer) As String

매개 변수

반환

separator 문자로 구분된 startIndex 시작하는 valuecount 요소로 구성된 문자열입니다.

-또는-

count 0이면 Empty.

예외

public:
 static System::String ^ Join(System::String ^ separator, ReadOnlySpan<System::Object ^> values);

public static string Join (string? separator, scoped ReadOnlySpan<object?> values);

static member Join : string * ReadOnlySpan<obj> -> string

Public Shared Function Join (separator As String, values As ReadOnlySpan(Of Object)) As String

매개 변수

반환

separator 문자열로 구분된 values 요소로 구성된 문자열입니다. -또는- values 요소가 0이면 Empty.

public:
 static System::String ^ Join(char separator, ReadOnlySpan<System::Object ^> values);

public static string Join (char separator, scoped ReadOnlySpan<object?> values);

static member Join : char * ReadOnlySpan<obj> -> string

Public Shared Function Join (separator As Char, values As ReadOnlySpan(Of Object)) As String

매개 변수

반환

separator 문자로 구분된 values 요소로 구성된 문자열입니다. -또는- values 요소가 0이면 Empty.

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(System::String ^ separator, System::Collections::Generic::IEnumerable<System::String ^> ^ values);

public static string Join (string separator, System.Collections.Generic.IEnumerable<string> values);

public static string Join (string? separator, System.Collections.Generic.IEnumerable<string?> values);

[System.Runtime.InteropServices.ComVisible(false)]
public static string Join (string separator, System.Collections.Generic.IEnumerable<string> values);

static member Join : string * seq<string> -> string

[<System.Runtime.InteropServices.ComVisible(false)>]
static member Join : string * seq<string> -> string

Public Shared Function Join (separator As String, values As IEnumerable(Of String)) As String

매개 변수

반환

separator 문자열로 구분된 values 요소로 구성된 문자열입니다.

-또는-

values 요소가 0이면 Empty.

특성

ComVisibleAttribute

예외

예제

다음 예제에서는 Eratosthenes의 Sieve 알고리즘을 사용하여 100보다 작거나 같은 소수를 계산합니다. 결과를 String형식의 List<T> 개체에 할당한 다음 Join(String, IEnumerable<String>) 메서드에 전달합니다.

using System;
using System.Collections.Generic;

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

   private static List<int> GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 });
      // Use Sieve of Eratosthenes 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<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      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

open System

let getPrimes maxPrime =
    let values = Array.CreateInstance(typeof<int>, [| maxPrime - 1 |], [| 2 |])
    // Use Sieve of Eratosthenes to determine prime numbers.
    for i = values.GetLowerBound 0 to values.GetUpperBound 0 |> float |> sqrt |> ceil |> int do
        if values.GetValue i :?> int <> 1 then
            for multiplier = i to maxPrime / 2 do
                if i * multiplier <= maxPrime then
                    values.SetValue(1, i * multiplier)

    let primes = ResizeArray()
    for i = values.GetLowerBound 0 to values.GetUpperBound 0 do
        if values.GetValue i :?> int = 0 then
            primes.Add i
    primes

let maxPrime = 100
let primes = getPrimes maxPrime
printfn $"Primes less than {maxPrime}:"
printfn $"""   {String.Join(" ", 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 primes As List(Of String) = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As List(Of String)
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes 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

설명

separator null경우 빈 문자열(String.Empty)이 대신 사용됩니다. values 멤버가 null경우 빈 문자열이 대신 사용됩니다.

Join(String, IEnumerable<String>) 먼저 요소를 문자열 배열로 변환하지 않고도 IEnumerable(Of String) 컬렉션의 각 요소를 연결할 수 있는 편리한 방법입니다. LINQ(Language-Integrated Query) 쿼리 식에 특히 유용합니다. 다음 예제에서는 알파벳의 대문자 또는 소문자를 포함하는 List(Of String) 개체를 특정 문자보다 크거나 같은 문자를 선택하는 람다 식(예에서는 "M")을 전달합니다. Enumerable.Where 메서드에서 반환된 IEnumerable(Of String) 컬렉션은 결과를 단일 문자열로 표시하기 위해 Join(String, IEnumerable<String>) 메서드에 전달됩니다.

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

public class Example
{
   public static void Main()
   {
      string output = String.Join(" ", 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(((char)(charValue + ctr)).ToString());
      return alphabet; 
   }
}
// The example displays the following output:
//      M N O P Q R S T U V W X Y Z

// This F# example uses Seq.filter instead of Linq.
open System

let getAlphabet upper =
    let charValue = if upper then 65 else 97
    seq {
        for i = 0 to 25 do
            charValue + i
            |> char
            |> string
    }

String.Join(" ", getAlphabet true |> Seq.filter (fun letter -> letter.CompareTo "M" >= 0))
|> printfn "%s"

// The example displays the following output:
//      M N O P Q R S T U V W X Y Z

Imports System.Collections.Generic
Imports System.Linq

Module modMain
   Public Sub Main()
      Dim output As String = String.Join(" ", 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:
'      M N O P Q R S T U V W X Y Z

추가 정보

• Split(Char[])

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(char separator, ... cli::array <System::Object ^> ^ values);

public static string Join (char separator, params object?[] values);

public static string Join (char separator, params object[] values);

static member Join : char * obj[] -> string

Public Shared Function Join (separator As Char, ParamArray values As Object()) As String

매개 변수

반환

separator 문자로 구분된 values 요소로 구성된 문자열입니다.

-또는-

values 요소가 0이면 Empty.

예외

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(System::String ^ separator, ... cli::array <System::Object ^> ^ values);

public static string Join (string separator, params object[] values);

public static string Join (string? separator, params object?[] values);

[System.Runtime.InteropServices.ComVisible(false)]
public static string Join (string separator, params object[] values);

static member Join : string * obj[] -> string

[<System.Runtime.InteropServices.ComVisible(false)>]
static member Join : string * obj[] -> string

Public Shared Function Join (separator As String, ParamArray values As Object()) As String

매개 변수

반환

separator 문자열로 구분된 values 요소로 구성된 문자열입니다.

-또는-

values 요소가 0이면 Empty.

-또는-

.NET Framework만 해당: values 첫 번째 요소가 null경우 Empty.

특성

ComVisibleAttribute

예외

예제

다음 예제에서는 Eratosthenes의 Sieve 알고리즘을 사용하여 100보다 작거나 같은 소수를 계산합니다. 결과를 정수 배열에 할당한 다음 Join(String, Object[]) 메서드에 전달합니다.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      int maxPrime = 100;
      int[] primes = GetPrimes(maxPrime);
      Console.WriteLine("Primes less than {0}:", maxPrime);
      Console.WriteLine("   {0}", String.Join(" ", primes));
   }

   private static int[] GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 }); 
      // Use Sieve of Eratosthenes 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<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      return primes.ToArray();
   }   
}
// 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

open System

let getPrimes maxPrime =
    let values = Array.CreateInstance(typeof<int>, [| maxPrime - 1 |], [| 2 |])
    // Use Sieve of Eratosthenes to determine prime numbers.
    for i = values.GetLowerBound 0 to values.GetUpperBound 0 |> float |> sqrt |> ceil |> int do
        if values.GetValue i :?> int <> 1 then
            for multiplier = i to maxPrime / 2 do
                if i * multiplier <= maxPrime then
                    values.SetValue(1, i * multiplier)

    [| for i = values.GetLowerBound 0 to values.GetUpperBound 0 do
        if values.GetValue i :?> int = 0 then
            i |]

let maxPrime = 100
let primes = getPrimes maxPrime
printfn $"Primes less than {maxPrime}:"
printfn $"""   {String.Join(" ", 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

Module Example
   Public Sub Main()
      Dim maxPrime As Integer = 100
      Dim primes() As Integer = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As Integer()
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes 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 System.Collections.Generic.List(Of Integer)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr)
      Next            
      Return primes.ToArray()
   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

설명

separator null 또는 첫 번째 요소가 아닌 values 요소가 null경우 빈 문자열(String.Empty)이 대신 사용됩니다. values 첫 번째 요소가 null경우 호출자 참고 섹션을 참조하세요.

Join(String, Object[]) 요소를 문자열로 명시적으로 변환하지 않고도 개체 배열의 각 요소를 연결할 수 있는 편리한 방법입니다. 배열에서 각 개체의 문자열 표현은 해당 개체의 ToString 메서드를 호출하여 파생됩니다.

호출자 참고

.NET Framework만 해당: values 첫 번째 요소가 null경우 Join(String, Object[]) 메서드는 values 요소를 연결하지 않고 대신 Empty반환합니다. 이 문제에 대한 여러 가지 해결 방법을 사용할 수 있습니다. 가장 쉬운 방법은 다음 예제와 같이 배열의 첫 번째 요소에 Empty 값을 할당하는 것입니다.

object[] values = { null, "Cobb", 4189, 11434, .366 };
if (values[0] == null) values[0] = String.Empty;
Console.WriteLine(String.Join("|", values));

// The example displays the following output:
//      |Cobb|4189|11434|0.366

let values: obj[] = [| null; "Cobb"; 4189; 11434; 0.366 |]
if values[0] = null then 
   values[0] <- String.Empty
printfn $"""{String.Join("|", values)}"""

// The example displays the following output:
//      |Cobb|4189|11434|0.366

Dim values() As Object = { Nothing, "Cobb", 4189, 11434, .366 }
If values(0) Is Nothing Then values(0) = String.Empty
Console.WriteLine(String.Join("|", values))
' The example displays the following output:
'      |Cobb|4189|11434|0.366

추가 정보

• Split(Char[])

public:
 static System::String ^ Join(char separator, ReadOnlySpan<System::String ^> value);

public static string Join (char separator, scoped ReadOnlySpan<string?> value);

static member Join : char * ReadOnlySpan<string> -> string

Public Shared Function Join (separator As Char, value As ReadOnlySpan(Of String)) As String

매개 변수

반환

separator 문자열로 구분된 value 요소로 구성된 문자열입니다. -또는- value 요소가 0이면 Empty.

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
 static System::String ^ Join(char separator, ... cli::array <System::String ^> ^ value);

public static string Join (char separator, params string?[] value);

public static string Join (char separator, params string[] value);

static member Join : char * string[] -> string

Public Shared Function Join (separator As Char, ParamArray value As String()) As String

매개 변수

반환

separator 문자로 구분된 value 요소로 구성된 문자열입니다.

-또는-

value 요소가 0이면 Empty.

예외

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
generic <typename T>
 static System::String ^ Join(char separator, System::Collections::Generic::IEnumerable<T> ^ values);

public static string Join<T> (char separator, System.Collections.Generic.IEnumerable<T> values);

static member Join : char * seq<'T> -> string

Public Shared Function Join(Of T) (separator As Char, values As IEnumerable(Of T)) As String

형식 매개 변수

매개 변수

반환

separator 문자로 구분된 values 멤버로 구성된 문자열입니다.

-또는-

values 요소가 없으면 Empty.

예외

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

Source:

String.Manipulation.cs

public:
generic <typename T>
 static System::String ^ Join(System::String ^ separator, System::Collections::Generic::IEnumerable<T> ^ values);

public static string Join<T> (string separator, System.Collections.Generic.IEnumerable<T> values);

public static string Join<T> (string? separator, System.Collections.Generic.IEnumerable<T> values);

[System.Runtime.InteropServices.ComVisible(false)]
public static string Join<T> (string separator, System.Collections.Generic.IEnumerable<T> values);

static member Join : string * seq<'T> -> string

[<System.Runtime.InteropServices.ComVisible(false)>]
static member Join : string * seq<'T> -> string

Public Shared Function Join(Of T) (separator As String, values As IEnumerable(Of T)) As String

형식 매개 변수

매개 변수

반환

separator 문자열로 구분된 values 요소로 구성된 문자열입니다.

-또는-

values 요소가 없으면 Empty.

특성

ComVisibleAttribute

예외

예제

다음 예제에서는 Eratosthenes의 Sieve 알고리즘을 사용하여 100보다 작거나 같은 소수를 계산합니다. 결과를 정수 형식의 List<T> 개체에 할당한 다음 Join<T>(String, IEnumerable<T>) 메서드에 전달합니다.

using System;
using System.Collections.Generic;

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

   private static List<int> GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 });
      // Use Sieve of Eratosthenes 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<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      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

open System

let getPrimes maxPrime =
    let values = Array.CreateInstance(typeof<int>, [| maxPrime - 1 |], [| 2 |])
    // Use Sieve of Eratosthenes to determine prime numbers.
    for i = values.GetLowerBound 0 to values.GetUpperBound 0 |> float |> sqrt |> ceil |> int do
        if values.GetValue i <> 1 then
            for multiplier = i to maxPrime / 2 do
                if i * multiplier <= maxPrime then
                    values.SetValue(1, i * multiplier)

    let primes = ResizeArray()
    for i = values.GetLowerBound 0 to values.GetUpperBound 0 do
        if values.GetValue i :?> int = 0 then
            primes.Add i
    primes

let maxPrime = 100
let primes = getPrimes maxPrime
printfn $"Primes less than {maxPrime}:"
printfn $"""   {String.Join(" ", 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 primes As List(Of Integer) = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As List(Of Integer)
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes 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 System.Collections.Generic.List(Of Integer)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr)
      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

설명

separator null경우 빈 문자열(String.Empty)이 대신 사용됩니다. values 멤버가 null경우 빈 문자열이 대신 사용됩니다.

Join<T>(String, IEnumerable<T>) 먼저 문자열로 변환하지 않고도 IEnumerable<T> 컬렉션의 각 멤버를 연결할 수 있는 편리한 방법입니다. IEnumerable<T> 컬렉션에 있는 각 개체의 문자열 표현은 해당 개체의 ToString 메서드를 호출하여 파생됩니다.

이 메서드는 LINQ(Language-Integrated Query) 쿼리 식에 특히 유용합니다. 예를 들어 다음 코드는 동물의 이름과 동물 이름이 속한 순서를 포함하는 매우 간단한 Animal 클래스를 정의합니다. 그런 다음 여러 Animal 개체를 포함하는 List<T> 개체를 정의합니다. Enumerable.Where 확장 메서드는 Order 속성이 "Rodent"인 Animal 개체를 추출하기 위해 호출됩니다. 결과는 Join<T>(String, IEnumerable<T>) 메서드에 전달됩니다.

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.Join(" ", animals.Where( animal => 
                      (animal.Order == "Rodent")));
      Console.WriteLine(output);  
   }
}
// The example displays the following output:
//      Squirrel Capybara

// This example uses F#'s Seq.filter function instead of Linq.
open System

type Animal =
  { Kind: string
    Order: string }
    override this.ToString() =
        this.Kind

let animals = ResizeArray()
animals.Add { Kind = "Squirrel"; Order = "Rodent" }
animals.Add { Kind = "Gray Wolf"; Order = "Carnivora" }
animals.Add { Kind = "Capybara"; Order = "Rodent" }
String.Join(" ", animals |> Seq.filter (fun animal -> animal.Order = "Rodent"))
|> printfn "%s"
// The example displays the following output:
//      Squirrel Capybara

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.Join(" ", animals.Where(Function(animal) _
                                           animal.Order = "Rodent"))
      Console.WriteLine(output)                                           
   End Sub
End Module
' The example displays the following output:
'      Squirrel Capybara

추가 정보

• Split(Char[])