c# - 将 json 反序列化为 C# 时遇到问题

Question

下面是我尝试反序列化的示例，当我尝试提取数据时遇到了一堆不同的错误。我只想提取 id 值，但我似乎无法弄清楚。

{"object":"payments","entry":[{"id":"546787862118679","time":1417135022,"changed_fields":["actions"]}]}

    public class Entry
    {
        public string id { get; set; }
        public int time { get; set; }
        public List<string> changed_fields { get; set; }
    }

    public class RootObject
    {
        public string @object { get; set; }
        public List<Entry> entry { get; set; }
    }

    dynamic result = new StreamReader(request.InputStream).ReadToEnd();
    var items = JsonConvert.DeserializeObject<RootObject>(result);
    string paymentID = items.entry.FirstorDefault().id;

返回此错误:

'System.Collections.Generic.List' does not contain a definition for 'FirstOrDefault()'

Answer 1

我觉得如果您的代码可以工作:

string paymentID = items.entry.FirstorDefault().id;

是

string paymentID = items.entry.FirstOrDefault().id;

而你的错误实际上是

'System.Collections.Generic.List' does not contain a definition for 'FirstorDefault'

因为 Collections.Generic.List 确实包含FirstOrDefault (System.Linq) 的定义