窗体showModal

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons;

type
  TForm1 = class(TForm)
    btn1: TBitBtn;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
uses  Unit2;
{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);
begin
  form2.ShowModal;
end;

end.

转换后

Unit2.cs 的代码为

using System;
using System.Windows.Forms;
using Unit2;
namespace Unit1
{
    public partial class TForm1: Form
    {
        public TForm1()
        {
            InitializeComponent();
        }

        public void btn1Click(System.Object Sender, System.EventArgs _e1)
        {
            Unit2.Units.Unit2.Form2.ShowDialog();//ShowDialog
        }

    } // end TForm1

}

namespace Unit1.Units
{
    public class Unit1
    {
        public static TForm1 Form1 = null;
    } // end Unit1

}