关于ToolStripSplitButton的问题，请教！

Question

ToolStripSplitButton表示左侧标准按钮和右侧下拉按钮的组合，怎么才能让下拉项不是系统默认的而是可以是定制的控件，比如下拉按钮时显示的是一个ListView或者ListBox，就像vs ide中Redo，Undo List的下拉时出现效果，谢谢？
 

Answer 1

自定义一个usercontrol用于host你的Listview。
自定义一个SplitButton，设置其DropDown为你的usercontrol。
示例代码：
 public interface IDataProvider {
            string[] GetData();
            event EventHandler DataChanged;
        }        public class StackListControl : UserControl {
            private Panel panel;
            private ListView myview;
            private IDataProvider _dataProvider;            public StackListControl(IDataProvider dataProvider) {
                _dataProvider = dataProvider;
                _dataProvider.DataChanged += new EventHandler(_dataProvider_DataChanged);
            }            void _dataProvider_DataChanged(object sender, EventArgs e)
            {
                PopulateList();
            }            private void PopulateList() {
                // get data from the provider
                // and update the listview
            }            //...
        }        public class MySplitButton : ToolStripSplitButton {
            StackListControl _listControl;
            public MySplitButton() {
                IDataProvider provider = CreateDataProvider();
                _listControl = new StackListControl(provider);
                _listControl.Dock = DockStyle.Fill;                ToolStripControlHost controlHost = new ToolStripControlHost(_listControl);
                controlHost.Dock = DockStyle.Fill;
                controlHost.Margin = Padding.Empty;                DropDown = new ToolStripDropDown();
                DropDown.Items.Add(controlHost);
                DropDownDirection = ToolStripDropDownDirection.BelowRight;
                DropDownOpened += new EventHandler(MySplitButton_DropDownOpened);
            }            void MySplitButton_DropDownOpened(object sender, EventArgs e)
            {
                _listControl.Focus();
                // ...
            }            private IDataProvider CreateDataProvider() {
                throw new NotImplementedException();
            }
        }