c# - 维护一堆通用函数

Question

有没有更好的方法来管理一堆通用函数？这些都有一个看起来几乎相同的实现。然而，改变它们是僧侣的工作 atm。

实现的接口(interface)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，但您可以想象实现的样子。如果我想更改这些方法的签名怎么办。

Answer 1

这是生成您的界面的 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。如果您提供 15，它将生成以下接口(interface)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，您可以在生成的代码中添加一些命名空间。