兄弟们，关于仿WINFROM的计算器，小数点问题

Question

else if(btn.Text==".")
            {
                int i =0;
                
                if (a == null)
                {
                    i++;
                    if (a != ".")
                    {
                        a += btn.Text;
                        textBoxResult.Text += btn.Text;
                    }                   
                    else
                    {
                        
                    }
                }
                else
                {                    
                    textBoxResult.Text += btn.Text;                    
                }
                i++;
            }我想说的是，小数点儿可以点击多次，怎么修改，高手救命！！！！

Answer 1

检查textbox.text 是有小数点就返回嘛

Answer 2

那就判断一下是否有.
indexof

Answer 3

    
  最差的办法就是用这个去判断 ===== textBoxResult.Text.IndexOf('.')

Answer 4

int i=0;
i=textBoxResult.Text.IndexOf('.');
if(i<=0)
{
可以添加
}
else
{
不可以添加
}