愛比的新手筆記

台灣是獨立國家

       public delegate void ClipboardEventHandler(object sender, ClipboardEventArgs e);

        /// <summary>
        /// 複製前
        /// </summary>
        [Description(@"複製前的事件")]
        [Category("Custom")]
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        public event ClipboardEventHandler CopyText;

        /// <summary>
        /// 貼上前
        /// </summary>
        [Description(@"貼上前的事件")]
        [Category("Custom")]
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        public event ClipboardEventHandler PasteText;

        /// <summary>
        /// 剪下前
        /// </summary>
        [Description(@"剪下前的事件")]
        [Category("Custom")]
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        public event ClipboardEventHandler CutText;

        protected override void WndProc(ref Message m)
        {
            ClipboardEventArgs ce;
            switch (m.Msg)//判斷所進行的動作
            {//若在事件中被取消就中斷
                case (int)WM.COPY:
                    ce = new ClipboardEventArgs(this.SelectedText);
                    OnCopyText(ce);
                    if (ce.Cancel) { return; }
                    break;
                case (int)WM.PASTE:
                    //抓出剪貼簿內的字
                    ce = new ClipboardEventArgs(Clipboard.GetText());
                    OnPasteText(ce);
                    if (ce.Cancel) { return; }
                    break;
                case (int)WM.CUT:
                    ce = new ClipboardEventArgs(this.SelectedText);
                    OnCutText(ce);
                    if (ce.Cancel) { return; }
                    break;
            }
            base.WndProc(ref m);
        }

        protected virtual void OnCopyText(ClipboardEventArgs e)
        { if (CopyText != null) { CopyText(this, e); } }

        /// <summary>
        /// 在貼上事件後
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnPasteText(ClipboardEventArgs e)
        {
            if (PasteText != null) { PasteText(this, e); }//放在前面,避免e.cancel被改掉
        }

        protected virtual void OnCutText(ClipboardEventArgs e)
        { if (CutText != null) { CutText(this, e); } }

這也是從網路上找來的方法，我自己再用C#寫在繼承的TextBox：

 同樣的寫法也能用在一些內建輸入用的元件

Taiwan is a country. 臺灣是我的國家