c# - Xamarin Firebase DeleteAsync

Question

我在从我的 Xamarin Android 应用程序的 Firebase 数据库中删除项目时遇到问题。

我收到 400(错误请求)错误

删除方法:

private async void RemovePost(string ActivityID)
{
    var firebase = new FirebaseClient(FirebaseURL);
    await firebase.Child("posts").Child(ActivityID).DeleteAsync();

    var intent = new Intent(mContext, typeof(MyProfileActivity));
    mContext.StartActivity(intent);
}

型号:

public class Post
{
    public string ActivityID { get; set; }

    public string OwnerID { get; set; }

    public string ActivityTitle { get; set; }

    public string ActivitySport { get; set; }

    public DateTime ActivityDate { get; set; }

    public DateTime ActivityTime { get; set; }

    public string ActivityTown { get; set; }

    public string ActivityAddress { get; set; }

    public string ActivityPhone { get; set; }

    public string ActivityEmail { get; set; }

    public string ActivityDetails { get; set; }
}

Firebase 数据库表:

请注意我传递给 RemovePost 方法的事件 ID 是“0”

Answer 1

为什么一开始将记录保存到数据库时不将 ActivityId 作为键？

var post = new Post {
    ActivityId = 0,
    //...other properties populated
}

var record = await firebase
    .Child("posts")
    .Child(post.ActivityId)
    .PostAsync(post));

var posts = await firebase
    .Child("posts")
    .OnceAsync<Post>();

foreach (var item in posts) {
    Console.WriteLine($"{item.Key} post has id {item.Object.ActivityId}");
}

await firebase.Child("posts").Child(post.ActivityID).DeleteAsync();

这样在查询记录时你可以查询一个已知的键