復制代碼 代碼如下:

public double? value1 = null ;//獲取運算符前的數值
public double? value2 = null ;//獲取運算符前的數值
public type caltype=type .none ;//獲取運算符
private void btnvalue1_Click(object sender, EventArgs e)
{
if (value1 == null)
{
value1 = Convert.ToDouble(btnvalue1.Text);
}
else
{
value2 = Convert.ToDouble(btnvalue1.Text);
}
this.txtvalue.Text = btnvalue1.Text;
}“1”按鈕的單擊事件

復制代碼 代碼如下:

public double? value1 = null ;//獲取運算符前的數值
public double? value2 = null ;//獲取運算符后的數值
public type caltype=type .none ;//獲取運算符
private void Form1_Load(object sender, EventArgs e)
{
btnvalue0.Click += new EventHandler(btnvalue_Click);
btnvalue1.Click += new EventHandler(btnvalue_Click);
btnvalue2.Click += new EventHandler(btnvalue_Click);
btnvalue3.Click += new EventHandler(btnvalue_Click);
btnvalue4.Click += new EventHandler(btnvalue_Click);
btnvalue5.Click += new EventHandler(btnvalue_Click);
btnvalue6.Click += new EventHandler(btnvalue_Click);
btnvalue7.Click += new EventHandler(btnvalue_Click);
btnvalue8.Click += new EventHandler(btnvalue_Click);
btnvalue9.Click += new EventHandler(btnvalue_Click);
//通過EventHandler將按鈕控件的Click事件
綁定到 btnvalue_Click上面，從而動態注冊按鈕事件
}
private void btnvalue_Click(object sender, EventArgs e)
{
Button btn =(Button)sender ;
//實例化按鈕，從而獲取當前單擊按鈕的值
if (value1 == null)
{
value1 = Convert.ToDouble(btn.Text);
}
else
{
value2 = Convert.ToDouble(btn.Text);
}
this.txtvalue.Text = btn.Text;
}