命名空间PowerBill { 公共局部类frmMain：表单 { //提供默认值 客户c =新客户（）；
public frmMain()
{
InitializeComponent();
}
// user select Residential
private void radResidential_CheckedChanged(object sender, EventArgs e)
{
HideSecondInput();
}
// user selects Commercial
private void radCommercial_CheckedChanged(object sender, EventArgs e)
{
HideSecondInput();
}
// user selects Industrial
private void radIndustrial_CheckedChanged(object sender, EventArgs e)
{
ShowSecondInput();
}
// hide second input prompt and txt box;
// adjust prompt for first input: generic kWh
private void HideSecondInput()
{
lblkWh1Prompt.Text = "Used kWh:";
lblkWh2Prompt.Visible = false;
txtkWh2.Visible = false;
txtkWh1.Focus(); // focus on first input box
}
// hide second input prompt and txt box;
// adjust prompt for first input: peak kWh
private void ShowSecondInput()
{
lblkWh1Prompt.Text = "Peak kWh:";
lblkWh2Prompt.Visible = true;
txtkWh2.Visible = true;
txtkWh1.Focus(); // focus on first input box
}
// calculate customer charge
private void btnCalculate_Click(object sender, EventArgs e)
{
int kWh = 0, peakKWh= 0, offPeaKWh = 0;
decimal charge = 0;
if (radResidential.Checked)
{
kWh = Convert.ToInt32(txtkWh1.Text);
charge = c.ResidentialCharge(kWh);
lblCharge.Text = charge.ToString("c");
//if(Validator.IsPresent(txtkWh1, "kWh") &&
// Validator.IsNonNegativeInteger(txtkWh1, "kWh"))
{
}
}
else if (radCommercial.Checked)
{
//if (Validator.IsPresent(txtkWh1, "Used kWh") &&
// Validator.IsNonNegativeInteger(txtkWh1, "kWh"))
{
kWh = Convert.ToInt32(txtkWh1.Text);
charge = CommercialCharge(kWh);
lblCharge.Text = charge.ToString("c");
}
}
else // must be industrial
{
//if (Validator.IsPresent(txtkWh1, "Peak kWh") &&
// Validator.IsNonNegativeInteger(txtkWh1, "Peak kWh") &&
// Validator.IsPresent(txtkWh2, "Off-peak kWh") &&
// Validator.IsNonNegativeInteger(txtkWh2, "Off-peak kWh"))
{
peakKWh = Convert.ToInt32(txtkWh1.Text);
offPeaKWh = Convert.ToInt32(txtkWh2.Text);
charge = IndustrialCharge(peakKWh, offPeaKWh);
lblCharge.Text = charge.ToString("c");
}
}
// display charge
lblCharge.Text = charge.ToString("c");
}
// calculate charge for residential customer
private decimal ResidentialCharge(int kWh)
{
const decimal BASE_CHARGE = 6;
const decimal CHARGE_PER_kWh = 0.052m;
decimal charge = BASE_CHARGE + kWh * CHARGE_PER_kWh;
return charge;
}
// calculate charge for commercial customer
private decimal CommercialCharge(int kWh)
{
const decimal BASE_CHARGE = 60;
const int THRESHOLD = 1000;
const decimal CHARGE_PER_kWh = 0.045m;
decimal charge = BASE_CHARGE;
if (kWh > THRESHOLD)
charge += (kWh - THRESHOLD) * CHARGE_PER_kWh;
return charge;
}
// calculate charge for industrial customer
private decimal IndustrialCharge(int peakKWh, int offPeakKWh)
{
const decimal PEAK_BASE_CHARGE = 76;
const decimal OFF_PEAK_BASE_CHARGE = 40;
const int THRESHOLD = 1000;
const decimal PEAK_CHARGE_PER_kWh = 0.065m;
const decimal OFF_PEAK_CHARGE_PER_kWh = 0.028m;
decimal charge, peakCharge, offPeakCharge;
// calculate charge for peak kWh
peakCharge = PEAK_BASE_CHARGE;
if (peakKWh > THRESHOLD)
peakCharge += (peakKWh - THRESHOLD) * PEAK_CHARGE_PER_kWh;
// calculate charge for off-peak kWh
offPeakCharge = OFF_PEAK_BASE_CHARGE;
if (offPeakKWh > THRESHOLD)
offPeakCharge += (offPeakKWh - THRESHOLD) * OFF_PEAK_CHARGE_PER_kWh;
// add the two charges
charge = peakCharge + offPeakCharge;
return charge;
}
// to clear the textbox
private void btnClear_Click(object sender, EventArgs e)
{
txtkWh1.Text = "";
txtkWh1.Text = "";
lblCharge.Text = "";
radResidential.Checked = true;
txtkWh1.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit(); //Close();
}
private void btnAdd_Click(object sender, EventArgs e)
{
}
}
}
嗨，您好
我已经完成了这项作业，但是不确定下一步如何完成 我认为作业也想使用读取功能进行其他方法计算
有什么建议帮助吗
这是作业
在添加新客户的数据时，或在应用程序关闭之前， 客户数据需要写入文件中。下次启动应用程序时，将从中读取数据 此文件允许更多添加更多客户。 您的应用程序应始终显示上面列出的客户数据的当前集合。在 另外，还要求您计算并显示以下统计信息： 客户总数， 每种客户类型的费用总和（三个值），以及 所有费用的总和。 步骤1：定义客户类别 将名为CustomerData的类库项目添加到您的Lab 1解决方案中。在您的项目中进行此项目 解。在CustomerData项目中，定义代表客户的Customer类。至少， 该课程应具有： 上述数据的公共属性， 一个或多个构造函数， 方法CalculateCharge根据以下方法计算此客户的费用金额： 规则，以及 返回显示字符串的ToString（）方法。
