代码无法从JSON中找到特定值

我使用C＃在axosoft的软件调用OnTime上进行api调用。

我在客户端中创建了三个自定义字段：

custom_170

custom_171

custom_172

每个字段都会添加到JSON调用“ custom_fields”的一个部分中。OnTime提供了自己的API包装器，可轻松使用其代码。

在下面的C＃代码中，我使用get从“ Defects”中提取JSON，然后循环遍历查找缺陷编号7。

如果找到数字7，它将从JSON ID，名称，custom_170，custom_171，custom_172中提取5个值。

我遇到的问题是我的程序找到了Id，Name，custom_170，但是查找custom_171的if语句从custom_172获取值，而最后一个if似乎从未被触摸过（请参见下面的结果）。

我怎样才能从custom_171和custom_172中获取值，并将它们放在正确的位置？

JSON（摘要）

{
    "data": {
        "reported_date": "2014-09-25T04:00:00Z",
        "percent_complete": 100,
        "archived": false,
        "publicly_viewable": false,
        "completion_date": null,
        "due_date": null,
        "description": "",
        "name": "Defect Created from API Explorer 3",
        "notes": "",
        "number": "7",
        "custom_fields": {
            "custom_171": "Work Around Steps",
            "custom_172": "Work Journal",
            "custom_170": "Analysis"
        }
    }
}

C＃代码

        var DefectInfo = axosoftClient.Defects.Get();

        int? defectID = 0;
        string defectName = "";
        string defectAnalysis = "";
        string defectWAS = "";
        string defectWJ = "";

        foreach (var defect in DefectInfo.Data)
        {
            if(defect.Id == 7)
            {
                defectID = defect.Id;
                defectName = defect.Name;
                if(defect.CustomFields.ContainsKey("custom_170"))
                {
                    defectAnalysis = (string)defect.CustomFields["custom_170"];
                }
                if(defect.CustomFields.ContainsKey("custom_171"))
                {
                    defectWAS = (string)defect.CustomFields["custom_171"];
                }
                if (defect.CustomFields.ContainsKey("custom_172"))
                {
                    defectWAS = (string)defect.CustomFields["custom_172"];
                }

            } 
        }
        Console.WriteLine("Defect ID: {0} Defect Name: {1}\nAnalysis: {2} \nWork Around: {3}\nWork Journal: {4}\n\n", defectID, defectName, defectAnalysis, defectWAS, defectWJ);

结果

Defect ID: 7 Defect Name: Defect Created from API Explorer 3
Analysis: Analysis
Work Around: Work Journal
Work Journal: