Hey there! I see you're trying to ditch the steam_appid.txt file while using Steamworks.NET, and that "Steamworks is not initialized" error is popping up. Let's get this sorted out—your code was almost right, but the order of operations was off!

The Core Issue #

You were calling SteamAPI.Init() before setting your AppID, which means Steamworks was already trying to look for the steam_appid.txt file before you could tell it what AppID to use. That's why your initial attempt didn't work.

The Correct Approach #

You need to set your AppID first, then initialize the SteamAPI. Here's how to do it properly:

// 1. Define your AppID first (replace 252490 with your actual AppID)
AppId_t yourAppId = new AppId_t(252490);

// 2. Assign the AppID to SteamAPI's static property BEFORE initializing
SteamAPI.AppId = yourAppId;

// 3. Now initialize SteamAPI
bool steamInitialized = SteamAPI.Init();

// Always check if initialization succeeded!
if (!steamInitialized)
{
    Console.WriteLine("Failed to initialize Steamworks.NET!");
    // Handle the failure here—maybe log an error, show a message to the user, or exit the app
    return;
}

Extra Notes #

• When your game is launched through the Steam client, Steam automatically passes the AppID to your process, so you won't need this manual AppID setting (or the steam_appid.txt file) for end users. This code is mainly for testing when you run the EXE directly.
• Don't forget to clean up when your app closes! Call SteamAPI.Shutdown() to properly release Steamworks resources:

  // Put this in your app's shutdown logic
  SteamAPI.Shutdown();
  

内容的提问来源于stack exchange，提问作者Ronohx