using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace 计算器
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void comboBox1_DrawItem(object sender, DrawItemEventArgs e) //修改combox 信息 中间显示
{
string s = this.comboBox1.Items[e.Index].ToString();
SizeF ss = e.Graphics.MeasureString(s, e.Font);
float l = (float)(e.Bounds.Width - ss.Width) / 2;
if (l < 0) l = 0f;
float t = (float)(e.Bounds.Height - ss.Height) / 2;
if (t < 0) t = 0f;
t = t + this.comboBox1.ItemHeight * e.Index;
e.DrawBackground();
e.DrawFocusRectangle();
e.Graphics.DrawString(s, e.Font, new SolidBrush(e.ForeColor), l, t);
}
private void Form1_Load(object sender, EventArgs e)
{
this.comboBox1.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
}
private void button1_Click(object sender, EventArgs e)
{
int str1 = Convert.ToInt32(textBox1.Text);
int str2 = Convert.ToInt32(textBox2.Text);
Jisuan jisuan = new Jisuan(Convert.ToInt32(str1), Convert.ToInt32(str2));
switch (comboBox1.Text)
{
case "+": label1.Text = jisuan.Add().ToString(); break;
}
}
}
}
类:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace 计算器
{
public class Jisuan
{
public Jisuan(int str1, int str2)
{
this.Number1 = str1;
this.Number2 = str2;
}
public int Number1
{
get ;
set;
}
public int Number2
{
get;
set;
}
public int Add()
{
return Number1 + Number2;
}
}
}
