| Description |
A new string is built containing an interleaving of all strings in a string array ValueArray with a fixed Separator string.
A subset of array strings may be used by starting at Start index, for Count strings (see the second example).
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| | Notes | Very Important : Methods in .Net treat strings as starting at 0, unlike traditional Delphi where they started at 1. Likewise arrays (our example defines an array starting at 0, but an array starting at 1 or more will still be treated as a zero-indexed array by the Join method).
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| Microsoft MSDN Links |
system
system.String
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| A simple example |
// Full Unit code.
// -------------------------------------------------------------
// Create a new WinForm application, double click the form to
// create an OnLoad event, and then replace the WinForm unit
// with this text.
unit WinForm;
interface
uses
System.Drawing, System.Collections, System.ComponentModel,
System.Windows.Forms, System.Data;
type
TWinForm = class(System.Windows.Forms.Form)
\{REGION 'Designer Managed Code'\} // Note that REGION and ENREGION should be prefixed by a dollar sign
strict private
///
/// Required designer variable.
///
Components: System.ComponentModel.Container;
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
procedure InitializeComponent;
procedure TWinForm_Load(sender: System.Object; e: System.EventArgs);
{ENDREGION}
strict protected
///
/// Clean up any resources being used.
///
procedure Dispose(Disposing: Boolean); override;
private
{ Private Declarations }
public
constructor Create;
end;
[assembly: RuntimeRequiredAttribute(TypeOf(TWinForm))]
implementation
\{REGION 'Windows Form Designer generated code'\}
///
/// Required method for Designer support -- do not modify
/// the contents of this method with the code editor.
///
procedure TWinForm.InitializeComponent;
begin
//
// TWinForm
//
Self.AutoScaleBaseSize := System.Drawing.Size.Create(5, 13);
Self.ClientSize := System.Drawing.Size.Create(292, 266);
Self.Name := 'TWinForm';
Self.Text := 'WinForm';
Include(Self.Load, Self.TWinForm_Load);
end;
{ENDREGION}
procedure TWinForm.Dispose(Disposing: Boolean);
begin
if Disposing then
begin
if Components <> nil then
Components.Dispose();
end;
inherited Dispose(Disposing);
end;
constructor TWinForm.Create;
begin
inherited Create;
//
// Required for Windows Form Designer support
//
InitializeComponent;
//
// TODO: Add any constructor code after InitializeComponent call
//
end;
procedure TWinForm.TWinForm_Load(sender: System.Object; e: System.EventArgs);
program Project1;
{$APPTYPE CONSOLE}
var
strA, strB : String;
strArray : Array[1..3] of String;
begin
strA := '---';
strArray[1] := 'Hello';
strArray[2] := 'cruel';
strArray[3] := 'World';
Console.WriteLine('strA = ' + strA);
strB := System.String.Join(strA, strArray);
Console.WriteLine('strB = ' + strB);
Console.ReadLine;
end.
end. | | Hide full unit code | strA = ---
strB = Hello---cruel---World
| | | Using only a subset of the array strings | program Project1;
{$APPTYPE CONSOLE}
var
strA, strB : String;
strArray : Array[0..6] of String;
begin
strA := '---';
strArray[0] := 'Zero';
strArray[1] := 'One';
strArray[2] := 'Two';
strArray[3] := 'Three';
strArray[4] := 'Four';
strArray[5] := 'Five';
strArray[6] := 'Six';
Console.WriteLine('strA = ' + strA);
// Use only array strings 2 to 4 (note that they start at 0)
strB := System.String.Join(strA, strArray, 2, 3);
Console.WriteLine('strB = ' + strB);
Console.ReadLine;
end.
| | Show full unit code | strA = ---
strB = Two---Three---Four
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