MVC For多级对象上的每个循环

Question

我有以下JSON：

{
"row2": {
    "Activity_log_key": 2,
    "Activity_day": "2017-01-12T00:00:00",
    "Effort": 8.0,
    "Comment": "comment text",
    "Activity": "activity text",
    "Work_group": "Project",
    "Work_item": "test project 1",
    "Related_category": {
        "Project_phase": [
            ["category_name", "Design"],
            ["category_key", 116255]
        ]
    }
},
"row3": {
    "Activity_log_key": 3,
    "Activity_day": "2017-01-12T00:00:00",
    "Effort": 5.5,
    "Comment": "no comments",
    "Activity": "activty demo text",
    "Work_group": "Project",
    "Work_item": "project 2",
    "Related_category": {
        "Project_phase": [
            ["category_name", "Develop"],
            ["category_key", 116256]
        ],
        "Training_provider": [
            ["category_name", "Analysis"],
            ["category_key", 116254]
        ]
    }
}

}

我将JSON响应转换为控制器中的对象：

Dim client As New HttpClient
Dim request = client.GetStringAsync(url & "/effort")
request.Wait()
Dim response = request.Result
Dim jsonObj As Object = New JavaScriptSerializer().Deserialize(Of Object)(response)
ViewData("response") = jsonObj

现在我尝试在视图中的For Each上运行ViewData("response")循环，但我没有结果。

我该如何解决？