C#里面中将字符串转为变量名

• 例如
  
  string str = "spp";
  
  string spp = "very good";
  
  怎样搞 str 而得到 very good 这个值？

 

public partial class Form1 : Form

    {
        string str = "spp";
        public string spp = "very good";

        public Form1()
        {
            InitializeComponent();

            MessageBox.Show(this.GetType().GetField(str).GetValue(this).ToString());
        }
    }