Delphi之Raise抛出异常

相关资料：

http://blog.csdn.net/a20071426/article/details/10160171

https://www.cnblogs.com/jijm123/p/11010309.html

实例代码：

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TMyException = class(Exception)
    FMessage: string;
    FInt: Integer;
    FStr: string;
    FBool: Boolean;
    public
    constructor Create(const Msg: string);
    property Message: string read FMessage write FMessage;
    property Int: Integer read FInt;
    property Str: string read FStr;
    property Bool: Boolean read FBool;
  end;

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  Int1: Integer;
begin
  try
    Int1 := StrToInt('A');
  except
    raise Exception.CreateFmt('%d = %s',[1001, '您的程序在Unit1单元35行出错了！']);//1001=您的程序在Unit1单元35行出错了！
  end;
end;

{ TMyException }

constructor TMyException.Create(const Msg: string);
begin
  FMessage := Msg;
  FInt := 100;
  FStr := 'NO';
  FBool := False;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  try
    raise TMyException.Create('aaaaa');
  except
    on e:TMyException do
    begin
      ShowMessage(e.Message); //aaaaa
      ShowMessage(IntToStr(e.Int)); //100
      ShowMessage(e.Str); //NO
      ShowMessage(BoolToStr(e.Bool)); //0
    end;
  end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  raise Exception.Create('抛出异常');   //抛出异常
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  exc: Exception;
begin
  exc := Exception.Create('发现异常'); //发现异常
  raise exc;
end;

end.