public partial class frmEnhancedInvoiceTotal : Form
{
public frmEnhancedInvoiceTotal()
{
InitializeComponent();
}
private void BtnExit_Click(object sender, EventArgs e)
{
Close();
}
decimal[] decTotalofInvoicesArray = new decimal[5];
int intNumberOfInvoices = 0; //global variables
decimal decTotalOfInvoicesVariable = 0m;
decimal decAverageOfInvoices = 0m;
private void BtnCalculate_Click(object sender, EventArgs e)
{
//Convert = Class, .ToDecimal = method,
//when the user clicks the calulate button,
//we collect the subtotal, determine the appropriate discount,
//calculate the total and output the result to the screen.
//***EARN PARTIAL CREDIT PUT COMMENTS***
//Input
try
{
decimal decSubtotal = 0m; //initialize subtotal with a value of zero. We'll collect from the user later.
if (Decimal.TryParse(txtSubtotal.Text,
System.Globalization.NumberStyles.Currency, //now can type a $ sign and now break the code
System.Globalization.CultureInfo.CurrentCulture,
out decSubtotal)) //.tryparse attempts to convert but is a fail safe
//parse does 2 things - does something and tells you if works
decTotalofInvoicesArray[intNumberOfInvoices] = decSubtotal;
{
//Processing
decimal decDiscountPercent = 0m; //defining a new variable (discount percent) allow for real #, giving it a intial value of 0. Decimal variables you have to add m
if (decSubtotal >= 500m) //if my subtotal is 500 or more
{
decDiscountPercent = 0.2m; //inside braces is what will happen to the question above
//set discount rate to 20%
}
else if (decSubtotal < 500m && decSubtotal >= 250m) //if subtotal is between 250 & 500
//^^redundant because < 500 is already stated in the first if statement
//could just right else if(decSubtotal >=250m)
{
decDiscountPercent = 0.15m; //set discount rate to 15%
}
else if (decSubtotal < 250m && decSubtotal >= 100m) //if subtotal is between 100 and 250
{
decDiscountPercent = 0.1m; //set discount to 10%
}
//if subtotal is less than 100, dicounter percent is 0%
decimal decDiscountAmount = decDiscountPercent * decSubtotal;
decimal decTotal = decSubtotal - decDiscountAmount; //He is going so fast
//Aggregate Processing - across mutliple clicks of the calculate button
//old way of doing it = intNumberOfInvoices = intNumberOfInvoices + 1;
intNumberOfInvoices++; //value of variable plus one
//old way of doing it decTotalOfInvoices = decTotalOfInvoices + decTotal;
decimal decSum = 0m;
for (int intColIndex = 0; intColIndex < decTotalofInvoicesArray.Length; intColIndex++)
{
decSum += decTotalofInvoicesArray[intColIndex];
}
decTotalOfInvoicesVariable = decSum;
decAverageOfInvoices = decSum / decTotalofInvoicesArray.Length;
//Output
txtSubtotal.Text = decSubtotal.ToString("c");
txtDiscountPercent.Text = decDiscountPercent.ToString("p2"); //sending a numeric value and sending it to text = gives error
txtDiscountAmount.Text = decDiscountAmount.ToString("c"); //dot ToString makes value a text value and sends to textbox in form
//c=currency //"p2" - 2 = how many decimal places
//P = percentage
txtTotal.Text = decTotal.ToString("c");
//aggregate output
txtNumberOfInvoices.Text = intNumberOfInvoices.ToString();
txtTotalOfInvoices.Text = decTotalOfInvoicesVariable.ToString("c");
txtAverageOfInvoices.Text = decAverageOfInvoices.ToString("c");
//breakpoint analysis = click on the grey side bar and slowly work through the code to find the error. Essentially pause the code and run the code one point at a time
}
}
catch (FormatException) //you do not know what went wrong in the try part. It just errors anyways because SOMETHING went wrong
{
MessageBox.Show("Please enter valid numeric values.", "Entry Error");
}
catch (OverflowException) //something is to big
{
MessageBox.Show("Please try smaller numbers", "Entry Error");
}
catch //generic error code because why not
{
MessageBox.Show("An unexpected error has occured. Please try again.", "Entry Error");
}
}
private void BtnClearTotals_Click(object sender, EventArgs e)
{
//When resetting aggregate/global info - need to reset the variables AND the visual interface
intNumberOfInvoices = 0;
decTotalOfInvoicesVariable = 0m;
decAverageOfInvoices = 0m;
// txtNumberOfInvoices.Text = ""; //setting the variable to nothing. Erase the information in the text box
txtNumberOfInvoices.Clear();
txtTotalOfInvoices.Clear();
txtAverageOfInvoices.Clear();
}
private void TxtSubtotal_TextChanged(object sender, EventArgs e)
{
txtDiscountPercent.Clear();
txtDiscountAmount.Clear();
txtTotal.Clear();
}
private void BtnDisplayTotals_Click(object sender, EventArgs e)
{
String strOrderTotals = "";
//for (int intColIndex = 0; intColIndex < intNumberOfInvoices; intColIndex++)
//{
// strOrderTotals += decTotalofInvoicesArray[intColIndex] + "\n";
//}
foreach (decimal decTotalInvoices in decTotalofInvoicesArray)
{
if (strOrderTotals == "0")
{
strOrderTotals += decTotalInvoices + "\n";
}
}
MessageBox.Show(strOrderTotals.ToString());
}
private bool IsValidData()
{
return
IsPresent(txtSubtotal) && //did you type anyting
IsDecimal(txtSubtotal) && //make sure you types a real number
IsWithinRange(txtSubtotal, 0m, 1000m); //is the number in the range
}
private bool IsPresent(TextBox textBox) //send an entire textbox into method
{
if (textBox.Text == "")
{
MessageBox.Show(textBox.Tag.ToString() + " is a required field.", "Missing Entry"); //textbox is whatever is in the (TextBox textBox)
textBox.Focus();
return false;
}
return true;
}
private bool IsDecimal(TextBox textBox)
{
decimal decTestValue = 0m;
if (!Decimal.TryParse(textBox.Text, out decTestValue)) //! - dont succusfully tryparse
{
MessageBox.Show(textBox.Tag.ToString() + " must be a numeric value", "Entry Error"); //textbox is whatever is in the (TextBox textBox)
textBox.Focus();
return false;
}
return true;
}
private bool IsInteger(TextBox textBox)
{
int intTestValue = 0;
if (!Int32.TryParse(textBox.Text, out intTestValue)) //! - dont succusfully tryparse
{
MessageBox.Show(textBox.Tag.ToString() + " must be a whole number.", "Missing Entry"); //textbox is whatever is in the (TextBox textBox)
textBox.Focus();
return false;
}
return true;
}
private bool IsWithinRange(TextBox textBox, decimal decMin, decimal decMax)
{
decimal decTestValue = Convert.ToDecimal(textBox.Text);
if (decTestValue < decMin || decTestValue > decMax) //to small or to big
{
MessageBox.Show(textBox.Tag.ToString() + " must be between " + decMin.ToString() + " and " + decMax.ToString() + "." + "Out of Range"); //textbox is whatever is in the (TextBox textBox)
textBox.Focus();
return false;
}
return true;
}
}
}
基本上，我有一个发票总额窗口表格，用户输入小计值，然后根据折扣百分比计算总值。在分配中，据说要创建一个最多包含五个发票总额的数组。我的问题是，当我键入2个小计的值并且单击显示总计时，我键入的2个数字与3个零一起显示。我想知道如何使用foreach循环仅显示我输入的数字而不显示零。
看来您没有在foreach中添加任何内容。
foreach (decimal decTotalInvoices in decTotalofInvoicesArray)
{
if (strOrderTotals == "0")
{
strOrderTotals += decTotalInvoices + "\n";
}
}
MessageBox.Show(strOrderTotals.ToString());
我是否正确阅读您想显示每张发票的信息，您也想要总额吗？带有for循环的这段代码应该可以工作。我
strOrderTotals = "My Invoices\n";
decimal decOrderTotals = 0;
for (int i = 0; i < decTotalofInvoicesArray.Length; i++)
{
if (decTotalofInvoicesArray[i] != 0)
{
strOrderTotals += "Invoice : " + decTotalofInvoicesArray[i] + "\n";
decOrderTotals += decTotalofInvoicesArray[i];
}
}
strOrderTotals += "Total of invoices: " + decOrderTotals;
MessageBox.Show(strOrderTotals.ToString());