C＃宏式泛型 [英] C# macro-style generics

问题描述

我正在寻找一种方法来让泛型只在编译时存在，以便重用代码：不必复制/粘贴类和方法。基本上像文本替换，就像宏一样，进行一些类型检查。更像是C ++模板。

为什么我要问：

正常的C＃泛型一直坚持总是创建泛型类型在运行时（为什么??），它不仅产生不必要的限制（例如不能从类型参数继承，这将是非常有用的），

<1> / p>

2）但这些运行时泛型类型现在为我创建了问题，因为.NET无法序列化它们，所以当我将它们插入到RichTextBox中时，许多操作要么失败或抛出无法序列化泛型异常。一切都与非泛型类型工作，但我想使代码更通用的添加东西，所以我添加了泛型（ C＃泛型继承解决方法），并且它们正在打破一切。

谢谢。

解决方案

虽然C＃没有C ++风格的模板，但您可以尝试使用 T4（文本模板转换工具包）来模仿它们。

您的文件看起来像这样：

 <＃@ template language =C＃＃> 
<＃@ output extension =。cs＃> 
 <＃
 foreach（new []中的var T [] {instantiate，for，these，types}）
 {
＃> 
 
 class FakeGeneric<＃= T＃> 
 {
<＃= T＃> FakeGenericField; 
} 
 
<＃}＃> 
  

这会产生如下的类型：

  class FakeGenericinstantiate 
 {
实例化FakeGenericField; 
} 
 
类FakeGenericfor 
 {
为FakeGenericField; 
} 
 
 // etc 
  

有 MSDN上关于使用T4生成代码的页面。

I am looking for a way to have generics which only exist at compile time for the purpose of code reuse: not having to copy/paste classes and methods. Just text replacement basically, like macros, with some type checks. More like C++ templates.

Reason why I am asking:

Normal C# generics insist on always creating generic types at run-time (why??), which

1) not only creates unnecessary limitations (e.g. cannot inherit from a type parameter, which would be very useful),

2) but these run-time generic types are creating problems for me right now because .NET cannot serialize them, so when I insert them into a RichTextBox, many operations either fail or throw "Cannot serialize a generic type" exceptions. Everything was working with non-generic types but I wanted to make the code more general to add things so I added generics ( C# Generic Inheritance workaround), and they are breaking everything.

Thanks.

解决方案

While C# doesn't have C++-style templates, you could try using T4 (the Text Template Transformation Toolkit) to mimic them.

Your file would look something like:

<#@ template language="C#" #>
<#@ output extension=".cs" #>
<#
    foreach (var T in new[]{"instantiate","for","these","types"})
    {
#>      

class FakeGeneric<#=T#>
{
    <#=T#> FakeGenericField;
}

<#  } #> 

This would generate the types like this:

class FakeGenericinstantiate
{
    instantiate FakeGenericField;
}

class FakeGenericfor
{
    for FakeGenericField;
}

// etc

There's a page on MSDN about using T4 to generate code like this.

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