Visual Basic(Beginner)错误:对象引用未设置为对象的实例

Question

我是初学者，所以请保持友善。我正在 Visual Basic 中制作货币兑换计算器，遇到了一个我似乎无法弄清楚的错误：

• 对象引用未设置为对象的实例。

这是我正在努力解决的代码：

Dim Currency As Double
Dim TextOther As String = Othertext.Text
Dim TextGBP As String = GBPtext.Text
Private Sub Calculate_Click(sender As Object, e As EventArgs) Handles Calculate.Click
    TextOther = Currency * Convert.ToDouble(TextGBP)
    TextGBP = Currency * Convert.ToDouble(TextOther)
End Sub

提前谢谢你。

Answer 1

您需要将货币设置为某些货币，并在(我假设是(您的文本框之后使用".text"。

还要在点击事件中设置变量。

Dim Currency As Double
Dim TextOther As String
Dim TextGBP As String
Private Sub Calculate_Click(sender As Object, e As EventArgs) Handles Calculate.Click
currency = 10.0
TextOther = Othertext.Text
TextGBP = GBPtext.Text
TextOther.text = Currency * Convert.ToDouble(TextGBP)
TextGBP.text = Currency * Convert.ToDouble(TextOther)
End Sub