c#在容器中动态创建按钮并绑定事件

        private void Form1_Load(object sender, EventArgs e)
        {
            string configPath = @"E:\新建文件夹\ImportConfig.xml";
            config = new ImportConfig(configPath);

            for (int i = 0; i < config.TableConfigs.Length; i++)
            {
                Button btn = new Button();
                btn.Text = config.TableConfigs[i].Table_Option.TableDispName;
                btn.Tag = config.TableConfigs[i].Table_Option.TableName;
                flp.Controls.Add(btn);
                btn.Click += new EventHandler(ImportDataSingle);
            }

        }


        private void ImportDataSingle(object sender,EventArgs e) {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Multiselect = false;
            if (ofd.ShowDialog()== System.Windows.Forms.DialogResult.OK)
            {
                string xlsxfilename = ofd.FileNa