Question

我有一个JSON对象，我已将其反序列化为服务器端的对象。其中一个对象是对象的arraylist，每个对象是string，array的字典。在我的手表中，我可以向下钻取对象并查看对象中的所有内容，但我无法弄清楚如何在代码中访问对象内的数据。我需要遍历每个对象并访问字典中的键和值。 Rigor对象就是我试图深入研究的对象。

我已经硬编码了数据的样子。

    string rigorSelection = "{\"StandardID\":165638," + 
                        "\"ItemTypes\":[\"Multiple Choice\",\"True/False\",\"Constructed Response\",\"Explicit Constructed Response\",\"Select Dropdown\",\"Evidence Based Selected Response\",\"Drag and Drop\",\"Selectable Text\",\"Multi-Part\",\"Graphing\",\"Matching\"], " +
                        "\"TotalItemCount\":10," +
                        "\"StandardName\":\"CCSS.9_12.MA.N.RN.2\"," +
                        "\"Rigor\":[" +
                            "{\"Remembering\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Understanding\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Applying\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Analyzing\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Evaluating\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Creating\":[0,0,0,0,0,0,0,0,0,0,0]}," +
                            "{\"Not Specified\":[0,0,0,0,0,0,0,0,0,0,0]}]" +
                        "}";

        System.Web.Script.Serialization.JavaScriptSerializer jSerializer =
           new System.Web.Script.Serialization.JavaScriptSerializer();
        AssessmentWCFVariables assessmentWCFVariable = jSerializer.Deserialize<AssessmentWCFVariables>(rigorSelection);

        var rigorCounts = assessmentWCFVariable.Rigor;

数据被反序列化的类是这个......

    [Serializable]
[DataContract]    
public class AssessmentWCFVariables
{
    [DataMember]
    public int StandardID { get; set; }

    [DataMember]
    public string StandardName { get; set; }

    [DataMember]
    public ArrayList ItemTypes { get; set; }

    [DataMember]
    public ArrayList Rigor { get; set; }

    [DataMember]
    public int TotalItemCount { get; set; }

}

UPDATE rigorCounts是一个对象的ArrayList。我可以遍历每个对象，但我尝试访问字典中的键/值对的所有内容都会给我一个错误。我想这样做。

    foreach (var rigor in rigorCounts)
        {
            var key = //code to get key of rigor i.e Remembering
            var value = //code to get the arrary i.e. [0,0,0,0,0,0,0,0,0,0,0]
        }

Answer 1

我同意单独的Rigor课程是最好的方法。但要回答你的具体问题：

foreach (var item in assessmentWCFVariable.Rigor)
{
   var dictionary = item as Dictionary<string, int[]>;

   if (dictionary == null) continue;

   // Do what you want with the dictionary here
}

可能需要对AssesmentClass进行以下更改：

[DataMember]
public IEnumerable<Dictionary<string, int[]> Rigor { get; set; }

Answer 2

我需要遍历每个对象并访问字典中的键和值。

如果您考虑Rigor对象词典中的对象，则应将Rigor对象的类型更改为：

  [DataMember]
  public List<Dictionary<string, Int32[]>> Rigor { get; set; }

然后，您可以使用以下代码轻松遍历Rigor对象中的每个字典：

var rigorCounts = assessmentWCFVariable.Rigor;

foreach (Dictionary<string, Int32[]> rigorCountDict in rigorCounts)
{
    foreach (KeyValuePair<string, Int32[]> kvpair in rigorCountDict)
    {
        string key = kvpair.Key; // e.g. "Remembering"
        Int32[] value = kvpair.Value; // e.g. [0,0,0,0,0,0,0,0,0,0,0]
    }
}

如果您没有将数据合同更改为字典列表，您可以在原始Rigor ArrayList上执行以下操作：

foreach (Dictionary<string, object> rigorCountDict in rigorCounts)
{
    foreach (KeyValuePair<string, object> kvpair in rigorCountDict)
    {
        string key = kvpair.Key; // e.g. "Remembering"
        Int32[] value = (Int32[])((ArrayList)kvpair.Value).ToArray(typeof(Int32)); // e.g. [0,0,0,0,0,0,0,0,0,0,0]
    }
}

它不如第一个例子那么优雅，但也可以。

Answer 3

您正在使用ArrayList Rigor。当您访问它时（例如，通过索引），您将获得一个需要进行转换的对象，然后才能访问它的属性。为Rigor个对象创建一个类并使用List<Rigor>可能会更好。类似的东西：

public class Rigor
{
    public List<int> Remembering { get; set; }
    public List<int> Understanding {get; set; }
    // an so on for other properties...
}

然后将您的AssessmentWCFVariables更改为：

[DataMember]
public List<Rigor> Rigor { get; set; }

恕我直言：自从引入通用ArrayList

以来，没有理由使用List<T>

C＃访问对象内的数据

3 个答案: