维护一堆通用功能

时间：2014-03-10 13:52:21

标签： c# generics

有没有更好的方法来管理一堆通用功能？这些都具有看起来几乎相同的实现。然而改变它们是一个僧侣工作atm。

实现的界面如下所示：

 IProxy<T> AddInterceptor<T1, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, TResult>, T1, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, TResult>, T1, T2, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, TResult>, T1, T2, T3, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, TResult>, T1, T2, T3, T4, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, TResult>, T1, T2, T3, T4, T5, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, TResult>, T1, T2, T3, T4, T5, T6, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, TResult>, T1, T2, T3, T4, T5, T6, T7, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult> func);
 IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult> func);

漂亮，但你可以通过电子邮件了解实现的外观。如果我想改变这些方法的签名，那该怎么办呢。

3 个答案:

答案 0 :(得分：16)

以下是生成界面的T4模板的可能实现：

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".cs" #>
<#  const int maxParametersCount = 15; #>
using System;
using System.Linq.Expressions;

public interface IInterceptable<T>
{
<# for(int parametersCount = 1; parametersCount <= maxParametersCount; parametersCount++) { 
   string parameters = String.Join(", ", Enumerable.Range(1, parametersCount).Select(i => "T" + i));         
#>    IProxy<T> AddInterceptor<<#= parameters #>, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<<#= parameters #>, TResult>, <#= parameters #>, TResult> func);
<#}#>
}

您只需提供maxParametersCount值即可。如果您将提供15，它将生成以下接口声明：

using System;
using System.Linq.Expressions;

public interface IInterceptable<T>
{
    IProxy<T> AddInterceptor<T1, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, TResult>, T1, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, TResult>, T1, T2, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, TResult>, T1, T2, T3, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, TResult>, T1, T2, T3, T4, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, TResult>, T1, T2, T3, T4, T5, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, TResult>, T1, T2, T3, T4, T5, T6, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, TResult>, T1, T2, T3, T4, T5, T6, T7, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, TResult> func);
    IProxy<T> AddInterceptor<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult>(Expression<Action<T>> functionOrProperty, Func<Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult>, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, TResult> func);
}

当然，您可以为生成的代码添加一些命名空间。

答案 1 :(得分：11)

您可以使用T4模板自动生成N种类型的代码。如果您需要稍微更改实施，只需编辑模板并重新生成即可。如果您之前生成了15，现在需要30，只需更改边界并重新生成。

这里更大的问题是设计 - 对于为什么首先需要这样做有点怀疑。重新检查那部分可能是值得的。

答案 2 :(得分：9)

这似乎是T4模板的理想用途...... 如果您还没有使用它们，它们允许您编写生成代码的代码。任何看起来像机器人的繁琐都可以做到 - 完美应用。

如果您更改签名中的某些内容，只需在t4模板中更改它，您的.cs文件就会自动使用新签名进行更新。

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