关于我编写的一个小型计算器。
我编了一个小型计算器，只会加减乘除，但是，我怎么越看越觉的别扭呢？希望大家帮我看看，特别是那些if,是不是用的太多了啊？？第一次编写，希望大家别见怪哈。。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
double z;
double a;
double save;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
textBox1.Text += "1";
}

private void button2_Click(object sender, EventArgs e)
{
textBox1.Text += "2";
}

private void button3_Click(object sender, EventArgs e)
{
textBox1.Text += "3";
}

private void button4_Click(object sender, EventArgs e)
{
textBox1.Text += "4";
}

private void button5_Click(object sender, EventArgs e)
{
textBox1.Text += "5";
}

private void button6_Click(object sender, EventArgs e)
{
textBox1.Text += "6";
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text += "7";
}

private void button8_Click(object sender, EventArgs e)
{
textBox1.Text += "8";
}

private void button9_Click(object sender, EventArgs e)
{
textBox1.Text += "9";
}

private void button0_Click(object sender, EventArgs e)
{
textBox1.Text += "0";
}
private void button_dot_Click(object sender, EventArgs e)
{
textBox1.Text += ".";
}

private void button_amount_Click(object sender, EventArgs e)
{
double equal = Convert.ToDouble(textBox1.Text);

if (save == 1)
{
textBox1.Text = Convert.ToString(add(equal, a));

}
if (save == 2)
{
textBox1.Text = Convert.ToString(minus(a, equal));

}
if (save == 3)
{
textBox1.Text = Convert.ToString(multiply(equal, a));

}
if (save == 4)
{
textBox1.Text = Convert.ToString(divide(a, equal));

}


}

private void button_add_Click(object sender, EventArgs e)
{
a = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";
save = 1;
}

private void button_minus_Click(object sender, EventArgs e)

{
a = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";
save = 2;
}

private void button_multiply_Click(object sender, EventArgs e)
{
a = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";
save = 3;
}

private void button_division_Click(object sender, EventArgs e)
{
a = Convert.ToDouble(textBox1.Text);
textBox1.Text = "";
save = 4;
}
private double add(double a,double b)
{
z = a + b;
return z;
}
private double minus(double a, double b)
{
z = a - b;
return z;
}
private double multiply(double a, double b)
{
z = a * b;
return z;
}
private double divide(double a, double b)
{
z = a / b;
return z;
}

private void button_Cancel_Click(object sender, EventArgs e)
{
textBox1.Text = "0";
}



}
}

[解决办法]
把这些按钮做成数组，这样管理起来方便点。
Button[] numberButtons;

10个数字键的单击事件全都注册到同一个事件处理程序。如：
在循环中：numberButtons[i].Click += new EventHandler(NumberButton_Click);
4个加减乘除键的单击事件全都注册到同一个事件处理程序。如：
在循环中：functionButtons[i].Click += new EventHandler(FunctionButton_Click);

使用委托。
delegate double NumberOperate(double x, double y);//定义一个委托。

double Add(double x, double y)//符合委托要求的加法算法。
{
return x + y;
}

double Minus(double x, double y)//符合委托要求的减法算法。
{
return x - y;
}
在类中定义一个NumberOperate类型的字段，按了哪个加减乘除键就把该字段设成哪种数字操作功能。
void FunctionButton_Click(object sender, EventArgs e)
{
switch (((Button)sender).Text)
{
case "+":
operate = new NumberOperate(Add); break;
case "-":
operate = new NumberOperate(Minus); break;
//请自己补充完整。

}
}
最后，只要
private void amountButton_Click(object sender, EventArgs e)
{
MessageBox.Show(operate(x, y).ToString());
}