嘿伙计们,我的程序一直有这个崩溃问题。
我正在尝试创建一个程序,它通过输入他们的期初余额、信用额度、总费用和总信用来计算一个人的账户余额。在这种情况下,我在总费用和总积分代码方面遇到了具体问题。
我设置了一个消息框,如果“总费用”和“总积分”框为空白,它将显示“请输入 .... 的数值”。问题是当我运行它并输入一个空白时,会出现消息然后程序崩溃。
崩溃后,该程序然后以黄色突出显示特定的转换代码(在这种情况下:decTotalCharges = Convert.ToDecimal(txtTotalCharges.Text))
并且错误显示Input string was not in correct format
.
怎么回事,我把它转换成正确的格式了吗?(十进制到十进制?)。以下是对我的代码的深入了解:
Public Class frmEndingBalance
'Declare module level variables
Dim mdecEndingBalance As Decimal
Dim mdecAllCharges As Decimal
Dim mdecAllCredits As Decimal
Dim mintCustomersOverLimit As Integer
Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click
'clears the form
'clears the labels
txtAccountNumber.Text = ""
txtBeginningBalance.Text = ""
txtTotalCharges.Text = ""
txtTotalCredits.Text = ""
txtCreditLimit.Text = ""
lblEndingBalance.Text = ""
lblCreditMessage.Text = ""
lblAllCharges.Text = ""
lblAllCredits.Text = ""
lblCustomersOverLimit.Text = ""
lblCreditMessage.Text = ""
'clear the textboxes
txtAccountNumber.Clear()
txtBeginningBalance.Clear()
txtTotalCredits.Clear()
txtTotalCharges.Clear()
txtCreditLimit.Clear()
'clear module level variables
mdecEndingBalance = 0
mdecAllCharges = 0
mdecAllCredits = 0
mintCustomersOverLimit = 0
End Sub
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
'Declare Variables
Dim intAccountNumber As Integer
Dim intBeginningBalance As Integer
Dim decTotalCharges As Decimal
Dim decTotalCredits As Decimal
Dim decCreditLimit As Decimal
Dim mdecEndingBalance As Decimal 'Beginning Balance + Charges - Credits()
Dim decCreditMessage As Decimal
'check for numeric
If IsNumeric(txtAccountNumber.Text) = False Then 'value is not numeric
MessageBox.Show("You can't enter anything blank!")
Exit Sub
End If
'convert to a numeric data type
intAccountNumber = Convert.ToInt32(txtAccountNumber.Text)
'check for numeric
If String.IsNullOrEmpty(txtBeginningBalance.Text) Then MessageBox.Show("Beginning Balance Cannot Be Blank!")
'check for everything else
If IsNumeric(txtBeginningBalance.Text) = False Then 'Value is not numeric
MessageBox.Show("Please enter a numeric value for Beginning Balance!")
Exit Sub
End If
'convert to a numeric data type
intBeginningBalance = Convert.ToInt32(txtBeginningBalance.Text)
'check for numeric
If IsNumeric(txtTotalCharges.Text) = False Then 'value is not numeric
MessageBox.Show("Please enter a numeric value for Total Charges!")
End If
'convert
decTotalCharges = Convert.ToDecimal(txtTotalCharges.Text)
'check for 0 or positive
If decTotalCharges < 0 Then
MessageBox.Show("Please enter a positive value or zero for number of Total Charges!")
Exit Sub
End If
'check for numeric
If IsNumeric(txtTotalCredits.Text) = False Then 'value is not numeric
MessageBox.Show("Please enter a numeric value for Total Credits")
End If
'convert to a numeric data type
decTotalCredits = Convert.ToDecimal(txtTotalCredits.Text)
'check for 0 or positive
If decTotalCredits < 0 Then
MessageBox.Show("Please enter a positive value or zero for total credits!")
End If
'check numeric
If IsNumeric(txtCreditLimit.Text) = False Then 'value is not numeric
MessageBox.Show("Please enter a numeric value for the Credit Limit!")
End If
'convert to a numeric data type
decCreditLimit = Convert.ToDecimal(txtCreditLimit.Text)
'check for a 0 or positive
If decCreditLimit < 0 Then
MessageBox.Show("Please enter a positive value or zero for Credit Limit!")
End If
'check for customers over limit
decCreditMessage = decCreditLimit - (mdecEndingBalance)
'running totals
mdecAllCharges += decTotalCharges
mdecAllCredits += decTotalCredits
'calculate Ending Balance
mdecEndingBalance = Convert.ToDecimal(intBeginningBalance + decTotalCharges - (decTotalCredits))
'display outputs
lblEndingBalance.Text = mdecEndingBalance.ToString("c")
lblAllCharges.Text = mdecAllCharges.ToString("c")
lblAllCredits.Text = mdecAllCredits.ToString("c")
lblCustomersOverLimit.Text = mintCustomersOverLimit.ToString("n0")
End Class
任何帮助将不胜感激!
谢谢