域.Net Core2 String.Contains（）失败？

Question

为UWP应用程序使用Realm数据库。我们正在从.NETCore 1.4升级到NETCore 2.0，并且Realm String.Contains（）函数损坏了。

有问题的查询如下：

var collections = realm.All<Collection>().Where(c =>
    c.Title.Contains(query, StringComparison.OrdinalIgnoreCase) ||
    c.TextDescription.Contains(query, StringComparison.OrdinalIgnoreCase));

当尝试使用该查询的结果（例如：collections.ToList()）时，我们收到以下异常：

Exception thrown: 'System.NotSupportedException' in System.Private.CoreLib.dll
An exception of type 'System.NotSupportedException' occurred in 
System.Private.CoreLib.dll but was not handled in user code
The method 'Contains' is not supported

Core 2不支持吗？