从字符串“”转换长时间无效 [英] Conversion from string "" to long is not valid

问题描述

即使经过大约一个小时的研究，我仍然遇到了无法解决的错误。

I'm getting an error which i can't solve, even after about an hour of research.

从字符串 Waseem-PC\Waseem到long的转换无效

Conversion from String "Waseem-PC\Waseem" to long is not valid

这个错误真的很烦人，我尝试了一切！



非常感谢您的帮助。我想给您的答案一个大拇指，但我必须要有一个更大的代表。

这是我的代码

This error really gets annoying, I tried everything!


I would really appreciate help from you. I would love to give your answers a thumbs up but i have to have a bigger rep.
Here is my code

    Private Sub RichTextBox2_KeyPress(sender As Object, e As KeyPressEventArgs) Handles RichTextBox2.KeyPress
        If Asc(e.KeyChar) = Keys.Enter Then
            RichTextBox1.Text = RichTextBox1.Text And vbNewLine And RichTextBox2.Text
        End If
    End Sub

推荐答案

您'错误地使用了 然后 关键字，用于（来自MSDN）：

You're incorrectly using the And keyword which is used for (from MSDN):

对两个布尔表达式执行逻辑合取，或按位取合

Perform a logical conjunction on two Boolean expressions, or bitwise conjunction on two numeric expressions.

相反，您想使用& 来 连接 字符串...

Instead you want to use & to concatenate the strings...

这将起作用：

 Private Sub RichTextBox2_KeyPress(sender As Object, e As KeyPressEventArgs) Handles RichTextBox2.KeyPress
    If Asc(e.KeyChar) = Keys.Enter Then
        RichTextBox1.Text = RichTextBox1.Text & vbNewLine & RichTextBox2.Text
    End If
End Sub

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