xamarin android GridLayout1 动态添加控件设置控件距离边距布局问题

Question

问题遇到的现象和发生背景

GridLayout1 动态添加控件设置距离边距布局问题

问题相关代码，请勿粘贴截图

        GridLayout1 = FindViewById<GridLayout>(Resource.Id.gridLayout1);
        GridLayout1.ColumnCount = 7;
        Button tv1 = new Button(this);
        tv1.Text = "数量";
        GridLayout1.AddView(tv1);
        Button tv2 = new Button(this);
        tv2.Text = "商品名";
        GridLayout1.AddView(tv2);
        Button tv3 = new Button(this);
        tv3.Text = "重量";
        GridLayout1.AddView(tv3);
        Button tv4 = new Button(this);
        tv4.Text = "单价";

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

如何动态设置控件位置边距