重载vb.net和放大器;运营商在C＃类 [英] Overloading the vb.net & operator in a c# class

问题描述

我在这里有一个令人难以置信的独特问题。我们的业务应用程序一直使用C＃和vb.net建成。我们一直在努力接近标准和修剪脂肪一些我们的核心，已复制，对象。我们正在非常接近，但试图巩固重复的对象转换为C＃，当我们的vb.net code现在开始引发错误操作员'和;没有定义类型CSType'和'串'，当我尝试用符号做vb.net字符串连接（安培）。有趣的是，如果我使用'和;在C＃与CSType（后适当超载）我得到的字符串连接我的期望。

I have an incredibly unique problem here. Our business application has been built using c# and vb.net. We have been trying to approach a standard and trim the fat for some of our core, already duplicated, objects. We are getting really close, but when trying to consolidate a duplicate object into c# our vb.net code now starts throwing the error "Operator '&' is not defined for type 'CSType' and 'String', when I try to do vb.net string concatenation using the ampersand(&). The funny thing is that if I use the '&' in c# with CSType (after properly overloading it) i get the string concatenation I expect.

下面是对CSType我的基本重载：

Here are my basic overloads on CSType:

public static string operator &(CSType c1, string s2)
{
    return c1.ToString() + s2;
}
public static string operator &(string s1, CSType c2) 
{
    return s1 + c2.ToString();
}

当我运行'和;运营商在C＃与CSType和一个字符串，我得到预期的结果，当我试图执行一个在vb.net的code不能编译，给我的错误是：

When I run the '&' operator in c# with a CSType and a string, I get the expected results, when I attempt to execute that in vb.net the code will not compile giving me an error that:

操作员'和;没有定义类型CSType'和'串'。

"Operator '&' is not defined for types 'CSType' and 'String'"

CSType也隐式转换为大多数数据类型，所以我在想，也许有一些问题，与'和;假设这是位运算符，但我想这将失败给了我搞砸了执行，而不是编译错误。

CSType also implicitly converts to most data types, so I was thinking that there may have been some issue with the '&' assuming that it was a bitwise operator, but I would guess that would fails by giving me messed up execution, not a compile error.

反正我是有点想放在类C ++的，我知道我能得到什么，我需要出来的，而不是2种语言够多了。

Anyway, I'm of half a mind to place this class in c++ where I know I can get what I need out of it, but isn't 2 languages enough already.

推荐答案

在＆安培; 运营商在C＃中是按位与运算。所以，当你重载它像

The & operator in C# is the bitwise AND operator. So when you overload it like

public static string operator &(CSType c1, string s2)
{
    return c1.ToString() + s2;
}
public static string operator &(string s1, CSType c2) 
{
    return s1 + c2.ToString();
}

您可以使用它在VB.Net与和操作符：

you can use it in VB.Net with the And operator:

Dim a = New CSType("Foo")
Dim b = "Bar"
Dim c = a And b

然而，超负荷VB.Net的＆安培; VB.Net（例如C＃）之外运营商，你必须创建一个名为方法 op_Concatenate 和使用<一个href="http://msdn.microsoft.com/query/dev11.query?appId=Dev11IDEF1&l=EN-US&k=k%28System.Runtime.CompilerServices.SpecialNameAttribute%29;k%28TargetFrameworkMoniker-.NETFramework,Version=v4.5%29;k%28DevLang-csharp%29&rd=true"相对=nofollow> SpecialName 属性：

However, to overload VB.Net's & operator outside of VB.Net (e.g. C#), you have to create a method named op_Concatenate and use the SpecialName attribute:

[SpecialName]
public static string op_Concatenate(CSType c1, string s2)
{
    return c1.ToString() + s2;
}

[SpecialName]
public static string op_Concatenate(string s1, CSType c2)
{
    return s1 + c2.ToString();
}

那么下面code将工作：

Then the following code will work:

Dim a = New CSType("Foo")
Dim b = "Bar"
Dim c = a & b

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