【C#】简单计算器源代码

form1.cs

 using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsApplication2

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}
private void clear_Click(object sender, EventArgs e)

{

box1.Text = "";

box2.Text = "";

jg.Text = "";

box1.Focus();
}
private void equal_Click(object sender, EventArgs e)

{

string b1 = box1.Text;

string b2 = box2.Text;

string fh = choice.Text;

double sum;

if (string.IsNullOrEmpty(b1) || string.IsNullOrEmpty(b2))

{

MessageBox.Show("请输入要计算的数据");

return;

}
double _a = 0;

bool _aParse = double.TryParse(b1, out _a);

double _b = 0;

bool _bParse = double.TryParse(b2, out _b);

if (!_aParse || !_bParse)

{

MessageBox.Show("请输入数字");

return;

}

if (string.IsNullOrEmpty(fh))

{

MessageBox.Show("请选择计算符号");

return;

}
switch (choice.Text.ToString())

{

case "+": sum = _a + _b;

jg.Text = Convert.ToString(sum = _a + _b);

MessageBox.Show(Convert.ToString(sum = _a + _b));

break;

case "-": sum = _a - _b;

jg.Text = Convert.ToString(sum = _a - _b);

MessageBox.Show(Convert.ToString(sum = _a - _b));

break;

case "*": sum = _a * _b;

jg.Text = Convert.ToString(sum = _a * _b);

MessageBox.Show(Convert.ToString(sum = _a * _b));

break;

case "/": sum = _a / _b;

jg.Text = Convert.ToString(sum = _a / _b);

MessageBox.Show(Convert.ToString(sum = _a / _b));

break;

}

clear.Focus();

}
private void Form1_Load(object sender, EventArgs e)

{

choice.Items.Add("+");

choice.Items.Add("-");

choice.Items.Add("*");

choice.Items.Add("/");

}

}
}

form.Designer.cs

namespace WindowsApplication2

{

partial class Form1

{

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.IContainer components = null;

/// <summary>

/// 清理所有正在使用的资源。

/// </summary>

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}
#region Windows 窗体设计器生成的代码
/// <summary>

/// 设计器支持所需的方法 - 不要

/// 使用代码编辑器修改此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.box1 = new System.Windows.Forms.TextBox();

this.jg = new System.Windows.Forms.Label();

this.equal = new System.Windows.Forms.Button();

this.box2 = new System.Windows.Forms.TextBox();

this.clear = new System.Windows.Forms.Button();

this.choice = new System.Windows.Forms.ComboBox();

this.tishi = new System.Windows.Forms.Label();

this.SuspendLayout();

//

// box1

//

this.box1.Location = new System.Drawing.Point(36, 115);

this.box1.Name = "box1";

this.box1.Size = new System.Drawing.Size(100, 21);

this.box1.TabIndex = 0;

//

// jg

//

this.jg.AutoSize = true;

this.jg.Location = new System.Drawing.Point(522, 117);

this.jg.Name = "jg";

this.jg.Size = new System.Drawing.Size(35, 12);

this.jg.TabIndex = 3;

this.jg.Text = "_____";

//

// equal

//

this.equal.Location = new System.Drawing.Point(416, 106);

this.equal.Name = "equal";

this.equal.Size = new System.Drawing.Size(75, 23);

this.equal.TabIndex = 3;

this.equal.Text = "等于";

this.equal.UseVisualStyleBackColor = true;

this.equal.Click += new System.EventHandler(this.equal_Click);

//

// box2

//

this.box2.Location = new System.Drawing.Point(290, 114);

this.box2.Name = "box2";

this.box2.Size = new System.Drawing.Size(100, 21);

this.box2.TabIndex = 2;

//

// clear

//

this.clear.Location = new System.Drawing.Point(416, 174);

this.clear.Name = "clear";

this.clear.Size = new System.Drawing.Size(75, 23);

this.clear.TabIndex = 4;

this.clear.Text = "清除";

this.clear.UseVisualStyleBackColor = true;

this.clear.Click += new System.EventHandler(this.clear_Click);

//

// choice

//

this.choice.FormattingEnabled = true;

this.choice.Location = new System.Drawing.Point(157, 117);

this.choice.Name = "choice";

this.choice.Size = new System.Drawing.Size(94, 20);

this.choice.TabIndex = 1;

this.choice.Text = "+";

//

// tishi

//

this.tishi.AutoSize = true;

this.tishi.Location = new System.Drawing.Point(155, 89);

this.tishi.Name = "tishi";

this.tishi.Size = new System.Drawing.Size(131, 12);

this.tishi.TabIndex = 6;

this.tishi.Text = "亲，请选择计算符号哦~";

//

// Form1

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(605, 275);

this.Controls.Add(this.tishi);

this.Controls.Add(this.choice);

this.Controls.Add(this.clear);

this.Controls.Add(this.box2);

this.Controls.Add(this.equal);

this.Controls.Add(this.jg);

this.Controls.Add(this.box1);

this.Name = "Form1";

this.Text = "Form1";

this.Load += new System.EventHandler(this.Form1_Load);

this.ResumeLayout(false);

this.PerformLayout();
}
#endregion
private System.Windows.Forms.TextBox box1;

private System.Windows.Forms.Label jg;

private System.Windows.Forms.Button equal;

private System.Windows.Forms.TextBox box2;

private System.Windows.Forms.Button clear;

private System.Windows.Forms.ComboBox choice;

private System.Windows.Forms.Label tishi;
}

}

【C#】简单计算器源代码