C#教学经验谈(3)：储蓄计算器的源程序-.NET教程,C#语言

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;

}

}

}