为什么我会收到标识符预期错误？ [英] Why am I getting identifier expected error?

问题描述

 公开 类 Form1 
 
 私有  Sub  Button1_Click（ ByVal  sender 作为系统。对象， ByVal  e  As  System.EventArgs）句柄 Button1.Click 
 gradeList.Items.Add（textgrade.Text）
 textgrade.Clear（）
 结束  Sub  
 
 < span class =code-keyword>私有  Sub  Button2_Click（ ByVal  sender 作为系统。对象， ByVal  e  As  System.EventAr gs）句柄 Button2.Click 
  Dim 总计正如  Double  
  Dim  avg 正如  Double  
  Dim 成绩正如  Double  
  Dim  gradecount 正如 整数 
 对于 gradecount =  0    gradeList.Items.Count  -   1  
 grade = gradeList。 Items。（gradecount）' <  -  ERROR here！ --------  
总计+ =等级
 下一步 
 avg = total / gradeList.Items .Count 
 Label3.Text =  Mediatotalăeste&总和& vbCrLf&   Scorul total este& avg 
 结束  Sub  
 
 私有  Sub  Button3_Click（ ByVal  sender 作为系统。对象， ByVal  e 正如 System.EventArgs）句柄 Button3.Click 
 Label3.Text =  String  .Empty 
 结束  Sub  
 结束 班级 

我尝试了什么：



我不知道该怎么办

 grade = gradeList.Items。（ gradecount）

解决方案

Items。（=> Items（

<块引用>我认为这是一个错误：

 '  grade = gradeList.Items。（gradecount） 
 
 grade = gradeList.Items（gradecount）

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        gradeList.Items.Add(textgrade.Text)
        textgrade.Clear()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim total As Double
        Dim avg As Double
        Dim grade As Double
        Dim gradecount As Integer
        For gradecount = 0 To gradeList.Items.Count - 1
            grade = gradeList.Items.(gradecount) ' <-- ERROR here! --------
            total += grade
        Next
        avg = total / gradeList.Items.Count
        Label3.Text = "Media totală este " & total & vbCrLf & "Scorul total este " & avg
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Label3.Text = String.Empty
    End Sub
End Class

What I have tried:

I don't know what to do

grade = gradeList.Items.(gradecount)

解决方案

Items.( => Items(

I think this is a mistake:

' grade = gradeList.Items.(gradecount)

grade = gradeList.Items(gradecount)

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