错误:从字符串“"的转换输入“整数"无效

本文介绍了错误:从字符串“"的转换输入“整数"无效的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 Select Case dlg Case Windows.Forms.DialogResult.Yes If TextBox12.Text = "" Then Dim a, b, c As Integer a = TextBox7.Text b = TextBox8.Text //my problem c = TextBox11.Text TextBox12.Text = a + b - c End If If TextBox6.Text = "" Then TextBox6.Text = "-" End If

我不知道如何解决这个错误:

I don't know how to fix this error:

从字符串 "" 到类型 'Integer' 的转换无效

Conversion from string "" to type 'Integer' is not valid

推荐答案

尝试使用 Integer.Parse:

Try using Integer.Parse:

Select Case dlg Case Windows.Forms.DialogResult.Yes If TextBox12.Text = "" Then Dim a, b, c As Integer a = Integer.Parse(TextBox7.Text) b = Integer.Parse(TextBox8.Text) //my problem c = Integer.Parse(TextBox11.Text) TextBox12.Text = a + b - c End If If TextBox6.Text = "" Then TextBox6.Text = "-" End If