努力将数组的内容导出到XML文件。我在第101行有一个错误。有人能在这里发现错误吗？或者我使用了错误的方法？
多谢你们！！
维克
码：
createNode((Str(i + 1)), strArray(i, 0), strArray(i, 1), strArray(i, 2), strArray(i, 3), strArray(i, 4), strArray(i, 5), writer)
错误：
错误2'System.Xml.XmlTextWriter'类型的值无法转换为'String'。
错误1未为'Private Sub createNode的参数'writer'指定参数（intQuantity为String，pNive为String，pGiven As String，pFamily As String，pResult As String，pTotal As String，pPercent As String，pGrade As String，writer As System.Xml.XmlTextWriter）”。
这是我的代码：
Imports System.Xml
Public Class frmStudentGrades
' Author: Victoria Farrell
' Date: August 2018
'Purpose: To calculate the display the graded results of student marks entered.
Dim intQuantity As Integer ' This variable handles the total number of students in the class
Dim strArray(intQuantity, 5) As String ' This Array handles all the data - student names, marks, percentages and final grades
Dim Counter As Integer ' This variable counts how many students are entered and handles each row in the array.
Private Sub btnSize_Click(sender As Object, e As EventArgs) Handles btnSize.Click
' This subroutine reads in the number of students in the class and informs the user to enter student data.
' Counter is set to zero at this point to intialise the first point in the array.
intQuantity = Val(txtQuantity.Text)
Counter = 0
MsgBox("Your class has " & intQuantity & " students. Please enter each student and their marks one by one.")
End Sub
Private Sub btnStudent_Click(sender As Object, e As EventArgs) Handles btnStudent.Click
Dim strArray(intQuantity, 5) As String
' The array is defined in terms of the size of the class (numbers of students)
If Counter < intQuantity Then
MsgBox("You have entered student number " & (Counter + 1))
' This message informs the user that they have entered data into the array and how many students have been entered based on the counter.
strArray(Counter, 0) = txtGivenName.Text ' The student given name is entered into the first column of the Counter-th row
strArray(Counter, 1) = txtFamilyName.Text ' The student family name is entered into the second column of the Counter-th row
strArray(Counter, 2) = txtResult.Text ' The student's result is entered into the third column of the Counter-th row
strArray(Counter, 3) = txtTotal.Text ' The total marks for the assessment is entered into the fourth column of the Counter-th row
strArray(Counter, 4) = CStr(Math.Round(((Val(strArray(Counter, 2)) / Val(strArray(Counter, 3))) * 100), 2))
' This calcuates the percentage of the results and enters it into the fifth column of the Counter-th row
' This IF statement tests the percentage and decides what the Letter Grade will be allocated. this goes into the sixth column.
If strArray(Counter, 4) < 50 Then
strArray(Counter, 5) = "F"
ElseIf strArray(Counter, 4) >= 50 And strArray(Counter, 4) < 60 Then
strArray(Counter, 5) = "E"
ElseIf strArray(Counter, 4) >= 60 And strArray(Counter, 4) < 70 Then
strArray(Counter, 5) = "D"
ElseIf strArray(Counter, 4) >= 70 And strArray(Counter, 4) < 80 Then
strArray(Counter, 5) = "C"
ElseIf strArray(Counter, 4) >= 80 And strArray(Counter, 4) < 90 Then
strArray(Counter, 5) = "B"
ElseIf strArray(Counter, 4) >= 90 And strArray(Counter, 4) <= 100 Then
strArray(Counter, 5) = "A"
End If
' The content of the entire row is added to the list box to be displayed.
listResults.Items.Add(strArray(Counter, 0) & " " & strArray(Counter, 1) & " " & strArray(Counter, 2) & "/" & strArray(Counter, 3) & " : " & strArray(Counter, 4) & "% Final Grade: " & strArray(Counter, 5))
' One is added to the counter because the row is complete and we need to count it.
Counter = Counter + 1
' when the Counter reaches the size of the class a warning will appear if they try to enter more students.
ElseIf Counter = intQuantity Then
MsgBox("You have entered all the students into your class")
End If
End Sub
Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
' This subroutine allows the user to clear the data from all the text boxes.
txtGivenName.Text = " "
txtFamilyName.Text = " "
txtResult.Text = " "
txtTotal.Text = " "
End Sub
Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
' This subroutine allows the user to close the program.
Me.Close()
End Sub
Private Sub btnXml_Click(sender As Object, e As EventArgs) Handles btnXml.Click
Dim writer As New XmlTextWriter("StudentResults.xml", System.Text.Encoding.UTF8)
writer.WriteStartDocument(True)
writer.Formatting = Formatting.Indented
writer.Indentation = 2
writer.WriteStartElement("Table")
For i As Integer = 0 To intQuantity
createNode((i + 1), strArray(i, 0), strArray(i, 1), strArray(i, 2), strArray(i, 3), strArray(i, 4), strArray(i, 5), writer)
Next i
writer.WriteEndElement()
writer.WriteEndDocument()
writer.Close()
End Sub
Private Sub createNode(ByVal intQuantity As String, pNumber As String, pGiven As String, pFamily As String, pResult As String, pTotal As String, pPercent As String, pGrade As String)
Dim writer As New XmlTextWriter("StudentResults.xml", System.Text.Encoding.UTF8)
For i As Integer = 0 To intQuantity
writer.WriteStartElement("Student_Number")
writer.WriteString(pNumber)
writer.WriteEndElement()
writer.WriteStartElement("Student_Given_Name")
writer.WriteString(pGiven)
writer.WriteEndElement()
writer.WriteStartElement("Student_Family_Name")
writer.WriteString(pFamily)
writer.WriteEndElement()
writer.WriteStartElement("Student_Result")
writer.WriteString(pResult)
writer.WriteEndElement()
writer.WriteStartElement("Student_Total")
writer.WriteString(pTotal)
writer.WriteEndElement()
writer.WriteStartElement("Student_Percentage")
writer.WriteString(pPercent)
writer.WriteEndElement()
writer.WriteStartElement("Student_Grade")
writer.WriteString(pGrade)
writer.WriteEndElement()
Next
End Sub
结束班
您可以使用8个值调用createNode函数。你在调用中的第8个值是writer这是一个XmlTextWriter，但在你的createNode函数中，第8个值是pGrade As String。当你调用writer函数时，createNode需要是第9个值。此外，当您的函数要求9个值时，您需要提供9个值。
您应该再次检查您的代码。当线条变得如此之长时，这可能会令人困惑。 ByVal也没有必要。您可以从createNode函数中删除它。