SteamWorks.Netを使ってSteamAPIを組み込むとき、テスト用のsteam_appid.txtをビルド結果のフォルダに配置する

CopyAppIdFilePostBuildProcess.cs

using UnityEngine;
using UnityEditor;
using UnityEditor.Callbacks;
using System.IO;
using System.Linq;
/// <summary>
/// SteamWorks.Netを使ってSteamAPIを組み込むとき、テスト用のsteam_appid.txtをビルド結果のフォルダに配置する//
/// Unity5.2.4で動作確認//
/// </summary>
public class PostBuildProcess 
{
    static readonly string STEAM_APPIDFILENAME = "steam_appid.txt";
    static readonly string STEAM_APPIDFILEPATH = "Plugins/Steamworks.NET/redist/";

    [PostProcessBuild]
    public static void OnPostProcessBuild(BuildTarget buildTarget, string path)
    {
        switch (buildTarget)
        {
            case BuildTarget.StandaloneWindows:
            case BuildTarget.StandaloneWindows64:
            case BuildTarget.StandaloneOSXIntel:
            case BuildTarget.StandaloneOSXIntel64:
            case BuildTarget.StandaloneOSXUniversal:
            case BuildTarget.StandaloneLinux:
            case BuildTarget.StandaloneLinux64:
            case BuildTarget.StandaloneLinuxUniversal:
                CopyAppIdFile(path);
                break;
        }
    }

    static void CopyAppIdFile(string path)
    {
        //.Net3.5だと3つ以上要素のCombineが使えないでござる//
        string copyFrom = new[] { Application.dataPath, STEAM_APPIDFILEPATH, STEAM_APPIDFILENAME }.Aggregate(Path.Combine);
        string copyTo = Path.Combine(Path.GetDirectoryName(path), STEAM_APPIDFILENAME);
        File.Copy(copyFrom, copyTo);
    }
}