C# 为什么firebase中的字符串返回null

当它离开匿名函数时，值返回null，但在它内部，如果它返回我需要获取的id，你知道如何获取string out值吗

firebase函数是一个异步函数，这意味着在异步函数完成之前（在成功或不成功状态下）不会运行内部回调

这意味着您的调试日志实际上是在异步函数的回调运行之前运行的

以下是一些您可以做的选择：

using System;

public static Action OnSignInSuccess;

让firebase异步函数在准备就绪时调用回调函数

//Anom loggin
    auth.SignInAnonymouslyAsync().ContinueWith(task =>
    {
        if (task.IsCanceled)
        {
            Debug.LogError("SignInAnonymouslyAsync was canceled.");
            return;
        }
        if (task.IsFaulted)
        {
            Debug.LogError("SignInAnonymouslyAsync encountered an error: " + task.Exception);
            return;
        }

        Firebase.Auth.FirebaseUser newUser = task.Result;
        Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId);

        userdataString = newUser.UserId;
        Debug.Log("userdatastring: " + userdataString);
    });

    Debug.Log("userdatastring out: " + userdataString);
}

然后在firebase异步回调中，您可以执行以下操作：

using System;

public static Action OnSignInSuccess;

然后，其他脚本可以通过以下方式订阅和取消订阅此回调事件：

    // ... within auth.SignInAnonymouslyAsync() callback

    Firebase.Auth.FirebaseUser newUser = task.Result;
    Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId);

    userdataString = newUser.UserId;

    if(OnSignInSuccess != null)
        OnSignInSuccess.Invoke();
}

---

3b。您还可以创建一个

公共UnityEvent onSignensAccess

并像单击

按钮
组件的
onClick
回调一样对其进行配置；）
void OnEnable(){
    YourScript.OnSignInSuccess += SignInSuccess;
}

void OnDisable(){
    YourScript.OnSignInSuccess -= SignInSuccess;
}

private void SignInSuccess(){
    Debug.Log("userdatastring: " + YourScript.staticInstance.userDataString);
}