例子一、将字符串转为变量名
string str = "spp";
public string spp = "very good";
private void button1_Click(object sender, EventArgs e)
{
    MessageBox.Show(this.GetType().GetField(str).GetValue(this).ToString());
}

例子二、通过字符串给变量赋值
public string gisoracle = "ok";
private void button2_Click(object sender, EventArgs e)
{
    //通过字符串获得变量值
    MessageBox.Show(this.GetType().GetField("gisoracle").GetValue(this).ToString());
    //通过给变量赋值
    this.GetType().GetField("gisoracle").SetValue(this, "gisoracle@126.com");
    //新的值
    MessageBox.Show(this.GetType().GetField("gisoracle").GetValue(this).ToString());
}