C# 發現之旅第十四講：VB.NET 腳本引擎（下）─ DocumentClass 文件物件封裝

DocumentClass 完整定義

public class DocumentClass {
    internal DocumentClass(frmMain frm) { myForm = frm; }
    private frmMain myForm = null;

    public string Text {
        get => myForm.txtEditor.Text;
        set => myForm.txtEditor.Text = value;
    }

    public void AppendText(string text) => myForm.txtEditor.AppendText(text);

    public string Selection {
        get => myForm.txtEditor.SelectedText;
        set => myForm.txtEditor.SelectedText = value;
    }

    public string FileName => myForm.FileName;

    public bool New() => myForm.Function_New();
    public bool Save() => myForm.Function_Save();
    public bool SaveAs() => myForm.Function_SaveAs();
    public bool Open() => myForm.Function_Open();

    public void Cut() => myForm.Function_Cut();
    public void Copy() => myForm.Function_Copy();
    public void Paste() => myForm.Function_Paste();
    public void Delete() => myForm.Function_Delete();
    public void SelectAll() => myForm.Function_SelectAll();
}

封裝設計重點

• 將主表單 frmMain 的文字編輯器操作包裝為文件導向介面
• 暴露 Text/Selection/AppendText 等核心編輯功能
• 委派檔案操作（新增/開啟/儲存）給主表單對應方法
• 編輯命令（剪下/複製/貼上/刪除/全選）同樣轉發
• 腳本透過 document 全域物件即可完整控制編輯器行為