Question

I have multiple classes in a project that are exactly the same except for the name of the class. Basically, they represent glorified enums loaded at runtime from config files. The classes look like this:

public class ClassName : IEquatable<ClassName> {
    public ClassName(string description) {
        Description = description;
    }

    public override bool Equals(object obj) {
        return obj != null &&
            typeof(ClassName).IsAssignableFrom(obj.GetType()) && 
            Equals((ClassName)obj);
    }

    public bool Equals(ClassName other) {
        return other != null && 
            Description.Equals(other.Description);
    }

    public override int GetHashCode() {
        return Description.GetHashCode();
    }

    public override string ToString() {
        return Description;
    }

    public string Description { get; private set; }
}

I see no reason to copy this file and change the class name multiple times. Surely there’s a way I can just list what classes I want and have them automatically created for me. How?

Answer 1

I’d suggest using T4. A substantial advantage of this over code snippets is that if you change your template then all of your code will be updated to match.

Put this in a file with the extension .tt

<#@ template language="C#" #>
<#@ output extension=".codegen.cs" #>
<#@ assembly name="System.dll" #>
<#@ import namespace="System" #>
// <auto-generated>
// This code was generated by a tool. Any changes made manually will be lost
// the next time this code is regenerated.
// </auto-generated>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MyStuff
{
<# foreach (string classname in classes) {#>
    public class <#= classname #> : IEquatable<ClassName> 
    {
            public <#= classname #>(string description) {
        Description = description;
    }

    public override bool Equals(object obj) {
        return obj != null &&
            typeof(<#= classname #>).IsAssignableFrom(obj.GetType()) && 
            Equals((<#= classname #>)obj);
    }

    public bool Equals(<#= classname #>other) {
        return other != null && 
            Description.Equals(other.Description);
    }

    public override int GetHashCode() {
        return Description.GetHashCode();
    }

    public override string ToString() {
        return Description;
    }

    public string Description { get; private set; }
    }
    }

<# } #> 
}

<#+ string[] classes = new string[] {  "Class1",
                                       "Class2" };
#>

VS will generate a source file for you. Just add to the array classes when you need a new class.