无需继承即可扩展字符串类函数 [英] Extends Strings Class Functions without inheritance

问题描述

我正在考虑扩展 strings 函数并将我自己的函数添加到模块中.但我发现字符串类是不可继承的.

I am thinking to extends the strings functions and add my own functions to the module. but I found that the strings class is non-inheritable.

有什么方法可以扩展类.我发现了类似的东西:

is there any way to extends the class. I found something like :

Class MyStringType
    Dim str As String
   function toTitleCase()
     'return titlecae
   end function
End Class

Dim s As MyStringType 
s.str = "mystringgoeshere"

但这并没有以正确的方式扩展，它会导致:

but this does not extends in the proper way, it will results to :

S.Str.normalStringFunctions
S.MyOwnFunctionsHere

结果，功能不在同一级别！！

in result, the functions are not in the same level !!

有什么想法吗?

推荐答案

你可以写 扩展方法也在VB.NET中

You can write Extension methods also in VB.NET

Module MyExtensions

    <Extension()> 
    Public Sub toTitleCase(input As String)
        ....
    End Sub
End Module

在这个语法糖"到位后，您可以将代码编写为

After this 'syntactic sugar' is in place you can write your code as

Dim newString = oldString.toTitleCase()

但是，我会记住您，ToTitleCase 方法已经在 System.Globalization.TextInfo 命名空间

However, I would to remember you that ToTitleCase method is already available in the System.Globalization.TextInfo namespace

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