Question

我有一个以下有效的json字符串：

var result = "[{\"total\":" + wpTotal + ",\"totalpages\":" + wpTotalPages + "},{\"tags\":[{\"id\":384},{\"id\":385}]}]";

我正在尝试使用此方法将其反序列化为类型为T的对象：

public static T FromJSON<T>(string json)
    {
        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
        {
            var settings = new DataContractJsonSerializerSettings
            {
                UseSimpleDictionaryFormat = true
            };
            var serializer = new DataContractJsonSerializer(typeof(T), settings);
            return (T)serializer.ReadObject(ms);
        }
    }

并像这样使用它：

var obj = JsonHelper.FromJSON<TagsResponse>(result);

我总是得到空结果（null），没有任何异常或任何类型的信息。

我的模特是：

[DataContract]
public class TagsResponse
{
    [DataMember(Name = "total")]
    public int Total { get; set; }

    [DataMember(Name = "totalpages")]
    public int TotalPages { get; set; }

    [DataMember(Name = "tags")]
    public List<Tag> Tags { get; set; }
}

问题出在哪里？

Answer 1

输入格式有问题，json字符串中的属性不是对象的预期级别，这是一个有效的例子：

class Program
{
    static void Main(string[] args)
    {
        var json = "{\"total\":" + 1 + ",\"totalpages\":" + 10 + ",\"tags\":[{\"id\":384},{\"id\":385}]}";
        var result = json.FromJSON<TagsResponse>();
        Console.WriteLine("Hello World!" + result);
    }
}

public static class Helper
{
    public static T FromJSON<T>(this string json)
    {
        var serializer = new DataContractJsonSerializer(typeof(T));
        using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
        {
            return (T)serializer.ReadObject(ms);
        }
    }
}

[DataContract]
public class TagsResponse
{
    [DataMember(Name = "total")]
    public int Total { get; set; }

    [DataMember(Name = "totalpages")]
    public int TotalPages { get; set; }

    [DataMember(Name = "tags")]
    public List<Tag> Tags { get; set; }
}

[DataContract]
public class Tag
{
    [DataMember(Name = "id")]
    public string Id { get; set; }
}

Answer 2

1）创建正确的json

var result = "[{\"total\":" + wpTotal + ",\"totalpages\":" + wpTotalPages + ",\"tags\":[{\"id\":384},{\"id\":385}]}]";

2）将其解析为数组

var obj = JsonHelper.FromJSON<TagsResponse[]>(result);

或，如果要将其解析为单个项目，可以从json中删除[]

var result = "{\"total\":" + wpTotal + ",\"totalpages\":" + wpTotalPages + ",\"tags\":[{\"id\":384},{\"id\":385}]}";
var obj = JsonHelper.FromJSON<TagsResponse>(result);

从JSON字符串到对象

2 个答案: