替换（var1，var2，""）将无法使用VB.NET [英] Replace(var1, var2, " ") won't work VB.NET

问题描述

我想取消选中该复选框以删除变量上的文字

I want when the checkbox is unchecked to delete text off a variable

Imports System
Imports System.IO
Imports System.Text
Imports System.Environment

Public Class Form1

    Dim slowchecked As Boolean = False
    Dim filepath As String
    Dim code1 As String = ""
    Dim slowdown As String

    Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
        If slowchecked = False Then
            slowdown = ("start" & NewLine & "start" & NewLine & "start" & NewLine & "start" _
                & NewLine & "start" & NewLine & "start" & NewLine & "start crash" & NewLine)
            code1 = (code1 & slowdown)
            slowchecked = True
        ElseIf slowchecked = True Then
            Replace(code1, slowdown, "")
            MsgBox(code1)
            slowchecked = False
        End If
    End Sub
End Class

但它不会删除或出现错误



我尝试过：



尝试交换替换（代码1，减速，）用code1.Replace（slowdown，），但我不知道是什么否则试试。

but it doesn't delete or come out with an error

What I have tried:

Tried swapping "Replace(code1, slowdown, "")" with "code1.Replace(slowdown, "")" but I don't know what else to try.

推荐答案

是的。但不是你假设它的方式。

替换不会改变字符串，它返回一个新的字符串，替换完成：替换函数（VB6） - VB&果壳中的VBA：语言[书籍] [ ^ ]

因此您需要将结果分配给变量，否则它就会被丢弃。



顺便说一下：如果你打算使用VB.NET，那么你应该停止使用VB6等函数，比如Replace和MsgBox，而是使用.NET版本：String.Replace Method（System）| Microsoft Docs [ ^ ]和 MessageBox.Show方法（System.Windows）| Microsoft Docs [ ^ ]

Yes it does. But not the way you are assuming it would.
Replace doesn't change strings, it returns a new string with the replacements done: Replace Function (VB6) - VB & VBA in a Nutshell: The Language [Book][^]
So you need to assign the result to a variable, or it is just discarded.

By the way: if you are going to use VB.NET, then you should stop using VB6 functions such as Replace and MsgBox, and use the .NET versions instead: String.Replace Method (System) | Microsoft Docs[^] and MessageBox.Show Method (System.Windows) | Microsoft Docs[^]

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