在Visual Basic中保存按钮问题 [英] Save button problem in Visual basic

问题描述

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问题是，如果我填充一个文本框并确实填充了另一个文本框，它的确会给我消息"框，但直到保存.为什么?

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The problem is that, if I fill a textbox and does fill another, it does give me the Message box but it is till saving. Why?

推荐答案

首先，看起来您正在将字符串与单个空格进行比较，而不是空白.

另外，您的组合框比较是将文本与其自身进行比较，而不是检查文本是否为空(应使用[cbo] .text ="或[cbo] .SelectedIndex = -1)

Firstly, it looks like you are comparing string to a single whitespace as opposed to being blank.

Also, your combobox comparisons are comparing text against itself, rather than checking if it''s empty (should use [cbo].text = "" or [cbo].SelectedIndex = -1)

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