我收到此错误“对象引用未设置为对象实例".有人知道如何解决这个问题吗? [英] I'm getting this error "object reference not set to an instance of an object" can somebody know how to fix this?

问题描述

Dim LookAhead() As Char
    Dim Counter As Integer
    Dim Character() As String

    'Method to scan input
    Public Sub LexicalAnalyzer()

        Dim Length As Integer
        Index = 0
        Length = Len(RichTextBoxInput.Text)

        Dim i As Integer = 0

        Try
            Dim InputLength As Integer


            InputLength = Len(RichTextBoxInput.Text)


            Do While i <= InputLength
                LookAhead = RichTextBoxInput.Text.Substring(i)
                If Mid(LookAhead, 1, 1) = " " Then

                    MsgBox("hghghgkj")
                    Index = Index + 1
                Else

'The error is in this part
                    Character(Index) = Mid(LookAhead, 1, 1)
                    MsgBox(Character(Index))
                End If
                i = i + 1
            Loop




        Catch ex As Exception
            MessageBox.Show(ex.Message)

        End Try

    End Sub

推荐答案

是的.通过调试器运行它，您可以轻松找到并自行修复.您正在尝试使用一个为空的对象，或者在一个为空的对象上调用方法.

Yes. Running this through the debugger, you could easily find this and fix it yourself. You are trying to use an object that is null or call a method on an object that is null.

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