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; } }