在C#教学的第二个案例前,先介绍了一个储蓄计算器的实验,该实验项目是从微软的教学光盘中取出的,部分源程序已经给出,要求学生完成事务处理部分。在做这个实验的时候,要求学生最好能够独立设计此项目。在这里,将该项目的代码给出如下。有特点的是,控件的名称使用的是中文。 
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace Saving { enum Compound { 每月计算利息, 每季度计算利息 } /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.Label label1; private System.Windows.Forms.NumericUpDown 初始金额; private System.Windows.Forms.Label label2; private System.Windows.Forms.NumericUpDown 利率; private System.Windows.Forms.Label label3; private System.Windows.Forms.Label label4; private System.Windows.Forms.ComboBox 计算规则; private System.Windows.Forms.Label label5; private System.Windows.Forms.Label label6; private System.Windows.Forms.Button 计算; private System.Windows.Forms.NumericUpDown 存期; private System.Windows.Forms.NumericUpDown 每月存入; private System.Windows.Forms.NumericUpDown 存款总额; /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null; public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // 计算规则.Items.Add(Compound.每月计算利息); 计算规则.Items.Add(Compound.每季度计算利息); 计算规则.SelectedItem = 计算规则.Items[0]; } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (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.label1 = new System.Windows.Forms.Label(); this.初始金额 = new System.Windows.Forms.NumericUpDown(); this.label2 = new System.Windows.Forms.Label(); this.利率 = new System.Windows.Forms.NumericUpDown(); this.label3 = new System.Windows.Forms.Label(); this.存期 = new System.Windows.Forms.NumericUpDown(); this.label4 = new System.Windows.Forms.Label(); this.计算规则 = new System.Windows.Forms.ComboBox(); this.label5 = new System.Windows.Forms.Label(); this.每月存入 = new System.Windows.Forms.NumericUpDown(); this.label6 = new System.Windows.Forms.Label(); this.存款总额 = new System.Windows.Forms.NumericUpDown(); this.计算 = new System.Windows.Forms.Button(); ((System.ComponentModel.ISupportInitialize)(this.初始金额)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.利率)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.存期)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.每月存入)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.存款总额)).BeginInit(); this.SuspendLayout(); // // label1 // this.label1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label1.Location = new System.Drawing.Point(32, 32); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(88, 16); this.label1.TabIndex = 0; this.label1.Text = "初始金额:"; // // 初始金额 // this.初始金额.DecimalPlaces = 2; this.初始金额.Increment = new System.Decimal(new int[] { 100, 0, 0, 0}); this.初始金额.Location = new System.Drawing.Point(112, 32); this.初始金额.Maximum = new System.Decimal(new int[] { -1156317184, 46566128, 0, 0}); this.初始金额.Name = "初始金额"; this.初始金额.Size = new System.Drawing.Size(168, 21); this.初始金额.TabIndex = 1; this.初始金额.ThousandsSeparator = true; this.初始金额.Value = new System.Decimal(new int[] { 1000, 0, 0, 0}); // // label2 // this.label2.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label2.Location = new System.Drawing.Point(32, 72); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(88, 16); this.label2.TabIndex = 0; this.label2.Text = "利率(%):"; // // 利率 // this.利率.DecimalPlaces = 2; this.利率.Increment = new System.Decimal(new int[] { 1, 0, 0, 65536}); this.利率.Location = new System.Drawing.Point(112, 72); this.利率.Name = "利率"; this.利率.Size = new System.Drawing.Size(168, 21); this.利率.TabIndex = 1; this.利率.ThousandsSeparator = true; this.利率.Value = new System.Decimal(new int[] { 20, 0, 0, 65536}); // // label3 // this.label3.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label3.Location = new System.Drawing.Point(32, 112); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(88, 16); this.label3.TabIndex = 0; this.label3.Text = "存期(年):"; // // 存期 // this.存期.Location = new System.Drawing.Point(112, 112); this.存期.Name = "存期"; this.存期.Size = new System.Drawing.Size(168, 21); this.存期.TabIndex = 1; this.存期.ThousandsSeparator = true; this.存期.Value = new System.Decimal(new int[] { 5, 0, 0, 0}); // // label4 // this.label4.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label4.Location = new System.Drawing.Point(32, 152); this.label4.Name = "label4"; this.label4.Size = new System.Drawing.Size(88, 16); this.label4.TabIndex = 0; this.label4.Text = "计算规则:"; // // 计算规则 // this.计算规则.Location = new System.Drawing.Point(112, 152); this.计算规则.MaxDropDownItems = 2; this.计算规则.Name = "计算规则"; this.计算规则.Size = new System.Drawing.Size(168, 20); this.计算规则.TabIndex = 2; // // label5 // this.label5.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label5.Location = new System.Drawing.Point(32, 192); this.label5.Name = "label5"; this.label5.Size = new System.Drawing.Size(88, 16); this.label5.TabIndex = 0; this.label5.Text = "每月存入:"; // // 每月存入 // this.每月存入.DecimalPlaces = 2; this.每月存入.Location = new System.Drawing.Point(112, 192); this.每月存入.Maximum = new System.Decimal(new int[] { -1156317184, 46566128, 0, 0}); this.每月存入.Name = "每月存入"; this.每月存入.Size = new System.Drawing.Size(168, 21); this.每月存入.TabIndex = 1; this.每月存入.ThousandsSeparator = true; // // label6 // this.label6.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134))); this.label6.Location = new System.Drawing.Point(32, 264); this.label6.Name = "label6"; this.label6.Size = new System.Drawing.Size(88, 16); this.label6.TabIndex = 0; this.label6.Text = "存款总额:"; // // 存款总额 // this.存款总额.DecimalPlaces = 2; this.存款总额.Increment = new System.Decimal(new int[] { 100, 0, 0, 0}); this.存款总额.Location = new System.Drawing.Point(112, 264); this.存款总额.Maximum = new System.Decimal(new int[] { -1156317184, 46566128, 0, 0}); this.存款总额.Name = "存款总额"; this.存款总额.ReadOnly = true; this.存款总额.Size = new System.Drawing.Size(168, 21); this.存款总额.TabIndex = 1; this.存款总额.ThousandsSeparator = true; // // 计算 // this.计算.Location = new System.Drawing.Point(248, 320); this.计算.Name = "计算"; this.计算.TabIndex = 3; this.计算.Text = "计算存款"; this.计算.Click += new System.EventHandler(this.计算_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(360, 373); this.Controls.Add(this.计算); this.Controls.Add(this.存款总额); this.Controls.Add(this.每月存入); this.Controls.Add(this.计算规则); this.Controls.Add(this.存期); this.Controls.Add(this.利率); this.Controls.Add(this.初始金额); this.Controls.Add(this.label1); this.Controls.Add(this.label2); this.Controls.Add(this.label3); this.Controls.Add(this.label4); this.Controls.Add(this.label5); this.Controls.Add(this.label6); this.Name = "Form1"; this.Text = "储蓄利率计算器"; ((System.ComponentModel.ISupportInitialize)(this.初始金额)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.利率)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.存期)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.每月存入)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.存款总额)).EndInit(); this.ResumeLayout(false); } #endregion /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void 计算_Click(object sender, System.EventArgs e) { double startAmount=(double)初始金额.Value; double rate=(double)利率.Value; int years=(int)存期.Value; Compound calcFrequency=(Compound) 计算规则.SelectedItem; double additional=(double)每月存入.Value; decimal totalValue=0; rate=rate/100; int months=12*years; switch (calcFrequency) { case Compound.每月计算利息: double monthlyRate=rate/12; for (int i=1; i<=months; i++) { startAmount+=startAmount*monthlyRate; startAmount+=additional; } break; case Compound.每季度计算利息: double quarterlyRate=rate/4; for (int i=1; i<=months; i++) { if (i%3==0) { startAmount+=startAmount*quarterlyRate; } startAmount+=additional; } break; default: MessageBox.Show("该项工作尚未实现!"); break; } totalValue=(decimal)startAmount; 存款总额.Value=totalValue; } } }

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