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我正在使用单元测试来测试DocumentDBRepository课程。我按照这篇文章作为 SQL 查询用例的示例。但它显示错误

消息：System.InvalidCastException：无法将类型“System.Linq.EnumerableQuery”的对象转换为类型“Microsoft.Azure.Documents.Linq.IDocumentQuery”

这是我的DocumentDBRepository课程代码

private IDocumentQuery<T> GetQueryBySQL(string queryStr)
{
    var uri = UriFactory.CreateDocumentCollectionUri(_databaseId, _collectionId);
    var feedOptions = new FeedOptions { MaxItemCount = -1, EnableCrossPartitionQuery = true };
    IQueryable<T> filter = _client.CreateDocumentQuery<T>(uri, queryStr, feedOptions); 
    IDocumentQuery<T> query = filter.AsDocumentQuery();
    return query;

}

public async Task<IEnumerable<T>> RunQueryAsync(string queryString)
{
    IDocumentQuery<T> query = GetQueryBySQL(queryString);

    List<T> results = new List<T>();

    while (query.HasMoreResults)
    {
        results.AddRange(await query.ExecuteNextAsync<T>());
    }
    return results;
}

这是我的测试类的代码

public async virtual Task Test_GetEntitiesAsyncBySQL()
{
    var id …