在 Visual Basic 中，我不断收到 String To double Error [英] In Visual Basic, I keep getting String To double Error

问题描述

我正在尝试在我的咖啡店程序中添加长度检查...我已经整理了一些，但我看不出哪里出错了.

I am trying to add a length check in my coffee shop program... i have sorted some of it out but i cant see where I am going wrong.

Dim Name As String

MsgBox("Welcome. You Are On The 'Hot Mornings' Self-Ordering Service", vbInformation, "Welcome To Hot Mornings!")
        Name = InputBox("Please Enter Your Name", "Welcome To Hot Mornings!", ,     MsgBoxStyle.OkCancel)

If Len(Name <= 3) Then
        Do Until Len(Name > 3)
            MsgBox("Error!", vbExclamation, MsgBoxStyle.OkOnly)
            MsgBox("An Error Occureed Earlier. We Are Currently Trying To fix This     Issue.", vbInformation, "Error!")
            Name = InputBox("Please Enter Your Name.", , "Must Contain More Than 3     Characters", MsgBoxStyle.OkCancel)
        Loop
    End If

推荐答案

Len(Name <= 3) 

这段代码没有任何意义.

This code doesn't make any sense.

您正在检查 Name(一个字符串)是否小于或等于 3(嗯?)，然后获取结果的 Len()查看.(嗯?)

You're checking whether Name (a string) is less or equal to than 3 (huh?), then getting the Len() of the result of that check. (huh?)

您可能想要获取字符串 (Len(Name)) 的 Len()，然后检查其结果(即数字)是否为小于或等于 3.

You probably want to get the Len() of the string (Len(Name)), then check whether the result of that (which is a number) is less than or equal to 3.

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