如果在编写表达式时, 如果能够随意指认需要的控件就好了(通过 Owner 也可以勉强做到), TBindScope 就是解决这个问题的. 示例设想: 把三个 TEdit 的 Text 绑定到一个 TLabel. 在窗体上添加 Label1、Edit1、Edit2、Edit3、BindingsList1、BindScope1; 激活 Edit1 和窗体的默认事件.

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unit Unit1;interfaceuses  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,  FMX.Types, FMX.Controls, FMX.Forms, FMX.Dialogs, Data.Bind.EngExt,  Fmx.Bind.DBEngExt, Data.Bind.Components, FMX.Layouts, FMX.Edit;type  TForm1 = class(TForm)    Edit1: TEdit;    Edit2: TEdit;    Edit3: TEdit;    Label1: TLabel;    BindingsList1: TBindingsList;    BindScope1: TBindScope;    procedure FormCreate(Sender: TObject);    procedure Edit1Change(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.fmx}procedure TForm1.FormCreate(Sender: TObject);begin  with TBindExpression.Create(BindingsList1) do  begin    ControlComponent := Label1;    ControlExpression := 'Text';    SourceComponent := BindScope1; //把 BindScope1 指定为源组件, 之后可以在表达式中直接使用控件名    SourceExpression := 'Format("%s,%s,%s", Edit1.Text, Edit2.Text, Edit3.Text)';    Active := True;  end;  BindScope1.Active := True; //  Edit2.OnChange := Edit1.OnChange;  Edit3.OnChange := Edit1.OnChange;end;procedure TForm1.Edit1Change(Sender: TObject);begin  BindingsList1.Notify(Sender, '');end;end.

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