| Description |
Returns true if the Unicode character, or the character at Index position in CharString is a decimal numeric digit character.
Decimal numeric characters :
| 0123456789 | Decimal digits |
Do not use this if you are simply looking to parse a normal decimal string - use IsDigit.
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| | Notes | Very Important : Methods in .Net treat strings as starting at 0, unlike traditional Delphi where they started at 1.
Static methods are not methods of an object - they are simply class functions or procedures available at any time.
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| Microsoft MSDN Links |
System
System.Char
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| An example of both syntaxes |
// 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
myStr : String;
begin
if System.Char.IsDigit('1')
then Console.WriteLine('1 is a digit character')
else Console.WriteLine('1 is not a digit character');
myStr := 'A2';
if System.Char.IsDigit(myStr, 0) // Note 0 based index
then Console.WriteLine('''' + myStr[1] + ''' is a digit character')
else Console.WriteLine('''' + myStr[1] + ''' is not a digit character');
if System.Char.IsDigit(myStr, 1) // Note 0 based index
then Console.WriteLine('''' + myStr[2] + ''' is a digit character')
else Console.WriteLine('''' + myStr[2] + ''' is not a digit character');
Console.ReadLine;
end.
end. | | Hide full unit code | 1 is a digit character
'A' is not a digit character
'2' is a digit character
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