クラスのインスタンスを動的に作成する。

Delphi2010と同じ動きをするDelphi Prismのソースです。

まずは、実行用のフォームの処理です。

namespace WindowsApplication1;

interface

uses
  System.Drawing,
  System.Collections,
  System.Collections.Generic,
  System.Linq,
  System.Windows.Forms,
  System.ComponentModel,
  System.Reflection,
  SakaTestSpace;

type
  /// 

  /// Summary description for MainForm.
  /// 
  MainForm = partial class(System.Windows.Forms.Form)
  private
    method button1_Click(sender: System.Object; e: System.EventArgs);
  protected
    method Dispose(disposing: Boolean); override;
  public
    constructor;
  end;



implementation


{$REGION Construction and Disposition}
constructor MainForm;
begin
  //
  // Required for Windows Form Designer support
  //
  InitializeComponent();

  //
  // TODO: Add any constructor code after InitializeComponent call
  //
end;

method MainForm.Dispose(disposing: Boolean);
begin
  if disposing then begin
    if assigned(components) then
      components.Dispose();

    //
    // TODO: Add custom disposition code here
    //
  end;
  inherited Dispose(disposing);
end;
{$ENDREGION}

method MainForm.button1_Click(sender: System.Object; e: System.EventArgs);
var
  SakaTestIntf : SakaTestSpace.ISakaTest;
  CreateClassName : String;
  t : System.Type;
  obj : System.Object;
  Assem  : System.Reflection.Assembly;

begin

  //使用するアセンブリをロードする
  Assem := System.Reflection.Assembly.Load('ClassLibrary1');

  t := Assem.GetType('SakaTestSpace.' + textBox1.Text);

  obj := Activator.CreateInstance(t);

  if obj <> nil then
  begin
    SakaTestIntf := (obj As  SakaTestSpace.ISakaTest);
    if SakaTestIntf <> nil then
    begin
      label3.Text := SakaTestIntf.SayMessage();
    end;
  end;
end;

end.

次に検証に使ったクラスです。

namespace SakaTestSpace;

interface

uses
  System.Collections.Generic,
  System.Linq,
  System.Text;

type
  ISakaTest = public interface
    method SayMessage : String;
  end;

type
  TSakaTest = public class(ISakaTest)
  private
  protected
  public
    method SayMessage : String ; virtual;
  end;

  TSakaTest1 = public class(TSakaTest)
  private
  protected
  public
    method SayMessage : String; override;
  end;

  TSakaTest2 = public class(TSakaTest)
  private
  protected
  public
    method SayMessage : String; override;
  end;

 
implementation

method TSakaTest.SayMessage : String;
begin
  Result := "";
end;

method TSakaTest1.SayMessage : String;
begin
  Result := 'Delphi Prism First Message';
end;

method TSakaTest2.SayMessage : String;
begin
  Result := 'Delphi Prism Second Message';
end;

end.

PrismのほうがActivatorクラスが使える分、楽だ（短い処理で実現可能）と思う

Rttiを試して見るその２(プリズム版）

別ブログで書いたDelphi2010のメソッドコールの
ソースと同等のソースをDelphi Prismで書いてみた。

namespace WindowsApplication1;

interface

uses
  System.Drawing,
  System.Collections,
  System.Collections.Generic,
  System.Linq,
  System.Windows.Forms,
  System.ComponentModel,
  System.Reflection;


type
  /// 

  /// Summary description for MainForm.
  /// 
  MainForm = partial class(System.Windows.Forms.Form)
  private
    method button1_Click(sender: System.Object; e: System.EventArgs);
  protected
    method Dispose(disposing: Boolean); override;
  public
    constructor;
    method SakaSum(a, b : Integer) : Integer;
  end;

implementation

{$REGION Construction and Disposition}
constructor MainForm;
begin
  //
  // Required for Windows Form Designer support
  //
  InitializeComponent();

  //
  // TODO: Add any constructor code after InitializeComponent call
  //
end;

method MainForm.Dispose(disposing: Boolean);
begin
  if disposing then begin
    if assigned(components) then
      components.Dispose();

    //
    // TODO: Add custom disposition code here
    //
  end;
  inherited Dispose(disposing);
end;
{$ENDREGION}

method MainForm.button1_Click(sender: System.Object; e: System.EventArgs);
var
  rtm : System.Reflection.MethodInfo;
  Args : Array of System.Object;
  Rst : System.Object;
  MyType : System.Type;
begin
  MyType := System.Type.GetType('WindowsApplication1.' + Self.Name);
  
  rtm := MyType.GetMethod('SakaSum');
  
  if rtm <> nil Then
  begin

    Args := new System.Object[2];
    Args[0] := Convert.ToInt32(textBox1.Text);
    Args[1] := Convert.ToInt32(textBox2.Text);
    Rst := rtm.Invoke(Self,Args);
    label5.Text := Rst.ToString();

  end;
end;

method MainForm.SakaSum(a, b : Integer) : Integer;
begin
  Result := a + b;
end;

end.