后台添加gridview里面控件的事件

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protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType != DataControlRowType.DataRow) return;

            if (e.Row.FindControl("btn_choice") != null)
            {
                Button btn_choice = (Button)e.Row.FindControl("btn_choice");
                btn_choice.Click += new EventHandler(btn_choice_Click);
            }
        }

        private void btn_choice_Click(object sender, EventArgs e)
        {
            Button button = (Button)sender;
            GridViewRow gvr = (GridViewRow)button.Parent.Parent;
            string pk = GridView1.DataKeys[gvr.RowIndex].Value.ToString();

           
        }