Firebase 数据库错误：System.Collections.Generic.Dictionary`2[System.String,System.Object]

Question

Firebase Databse Fails to download data when needed in between other similar operations in app.

System.Collections.Generic.Dictionary`2[System.String,System.Object]

Firebase Cannot take do new GetValueASync sometimes in middle of similar operations of app and throws System.Collections.Generic.Dictionary 2[System.String,System.Object]` as a snapshot value.

Steps to reproduce: Setup any unity project with realtime databse perform non stop multiple times: .GetValueAsync().ContinueWithOnMainThread(task => then you will get value as System.Collections.Generic.Dictionary 2[System.String,System.Object]` instead of any child/key/database value.

public void aaaa() {
    Reference.Child("Users").OrderByChild("About/XP").StartAt(1).LimitToFirst(12).GetValueAsync().ContinueWithOnMainThread(task => {
      if (task.IsFaulted) {

        return;
      } else if (task.IsCompleted) {
        DataSnapshot Snapshot = task.Result;
        if (Snapshot != null)
          Debug.Log(Snapshot.Value);
        return;
      }
      return;

    });

Answer 1

Well this happens if you use ToString (which is what Debug.Log does internally) on a dictionary or in general any object of a type that doesn't implement it explicitly, it simply returns the same as GetType().FullName .

Default implementations of the Object.ToString method return the fully qualified name of the object's type.

So it looks like the type is a Dictionary<string, object> .

If you want to see all items you rather want to do eg

foreach(var kvp in Snapshot.Value)
{
    Debug.Log($"Key: {kvp.Key}, Value: {kvp.Value}");
}

Note though: while the key is a string , the value once again might be a type not implementing ToString in which case again it will simply print out the type name.

---

If you really want to print out the entire structure (as far as the values are serializable) you could use Newtonsoft JSON.Net and convert the entire dictionary into a human readable JSON format.

See Serialize a Dictionary

string json = JsonConvert.SerializeObject(Snapshot.Value, Formatting.Indented);
Debug.Log(json);