用WinForm做一个简单的计算器

首先创建一个界面将Button控件拖进来，修改好Text以及Name，
显示器用lable来做，将默认text和Tag属性设置为0，背景颜色BackColor可以根据自己喜好修改
数字0-9按钮名称Btnnumber1-9
加减乘除点等于按钮名为Btnplus.Btnreduce.Btnride.Btnexcept.Btndoc.Btnend
emmm代码如下：

        double number1 = 0;double number2 = 0;double resultNumber = 0;#region  数字1-9private void Btnnumber0_Click(object sender, EventArgs e){if (lbdisplay.Text != "0"){lbdisplay.Text += "0";}}private void Btnnumber1_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "1";}else{lbdisplay.Text += "1";}}private void Btnnumber2_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "2";}else{lbdisplay.Text += "2";}}private void Btnnumber3_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "3";}else{lbdisplay.Text += "3";}}private void Btnnumber4_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "4";}else{lbdisplay.Text += "4";}}private void Btnnumber5_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "5";}else{lbdisplay.Text += "5";}}private void Btnnumber6_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "6";}else{lbdisplay.Text += "6";}}private void Btnnumber7_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "7";}else{lbdisplay.Text += "7";}}private void Btnnumber8_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "8";}else{lbdisplay.Text += "8";}}private void Btnnumber9_Click(object sender, EventArgs e){if (lbdisplay.Text == "0"){lbdisplay.Text = "9";}else{lbdisplay.Text += "9";}}#endregion/// <summary>/// 小数点/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Btndoc_Click(object sender, EventArgs e){if (lbdisplay.Text.Contains(".")){}else{lbdisplay.Text += ".";}}/// <summary>/// 清空/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Btnnull_Click(object sender, EventArgs e){lbdisplay.Text = "0";number1 = 0;number2 = 0;resultNumber = 0;lbdisplay.Tag = "0";}/// <summary>/// 等于/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Btnend_Click(object sender, EventArgs e){number2 = Convert.ToDouble(lbdisplay.Text);switch (lbdisplay.Tag){case "+":resultNumber = number1 + number2;break;case "-":resultNumber = number1 - number2;break;case "*":resultNumber = number1 * number2;break;case "/":resultNumber = number1 / number2;break;}lbdisplay.Text = $"{resultNumber}";number1 = 0;number2 = 0;lbdisplay.Tag = "0";}public void end(){number2 = Convert.ToDouble(lbdisplay.Text);switch (lbdisplay.Tag){case "+":resultNumber = number1 + number2;break;case "-":resultNumber = number1 - number2;break;case "*":resultNumber = number1 * number2;break;case "/":resultNumber = number1 / number2;break;}lbdisplay.Text = "0";//lbdisplay.Text = $"{resultNumber}";number1 = resultNumber;number2 = 0;}#region  加减乘除private void Btnplus_Click(object sender, EventArgs e){if (lbdisplay.Tag.ToString() == "0"){number1 = Convert.ToDouble(lbdisplay.Text);lbdisplay.Text = "0";lbdisplay.Tag = "+";}else{end();}}private void Btnreduce_Click(object sender, EventArgs e){if (lbdisplay.Tag.ToString() == "0"){number1 = Convert.ToDouble(lbdisplay.Text);lbdisplay.Text = "0";lbdisplay.Tag = "-";}else{end();}}private void Btnride_Click(object sender, EventArgs e){if (lbdisplay.Tag.ToString() == "0"){number1 = Convert.ToDouble(lbdisplay.Text);lbdisplay.Text = "0";lbdisplay.Tag = "*";}else{end();}}private void Btnexcept_Click(object sender, EventArgs e){if (lbdisplay.Tag.ToString() == "0"){number1 = Convert.ToDouble(lbdisplay.Text);lbdisplay.Text = "0";lbdisplay.Tag = "/";}else{end();}}#endregion

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