Concat字符串&和+在VB.Net [英] Concat strings by & and + in VB.Net

问题描述

&之间是否有任何区别？和+运算符同时连接字符串？
如果是，那么有什么区别？如果不是，那么为什么下面的代码会生成异常？

Is there any difference between & and + operators while concatenating string? if yes, then what is difference? And if No, then why below code generating exception?

示例：

    Dim s, s1, t As String
    Dim i As Integer

    s1 = "Hello"
    i = 1

    s = s1 & i
    t = s1 + i  //Exception here

    If s = t Then
        MessageBox.Show("Equal...")
    End If

推荐答案

&和+都是串联运算符，但是当您在使用+时指定整数时，vb.net会尝试将 Hello转换为整数以进行加法运算。如果将 Hello更改为 123，将得到结果124。

& and + are both concatenation operators but when you specify an integer while using +, vb.net tries to cast "Hello" into integer to do an addition. If you change "Hello" with "123", you will get the result 124.

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