Question

我想用c＃在asp.net中解析这个json数组这是要解析的示例Json数据：

[
    {
        "idvisit":"3",
        "iduser":"shoaibshakeel",
        "idpage":"1",
        "pagetime":"0"
    },
    {
        "idvisit":"4",
        "iduser":"shoaibshakeel",
        "idpage":"2",
        "pagetime":"28"
    },
    {
        "idvisit":"5",
        "iduser":"shoaibshakeel",
        "idpage":"3",
        "pagetime":"0"
    }
]

这是我目前在我的代码文件中执行的操作：

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string jsonData = Request.Form[0];
        Response.Write(jsonData);
        Response.Write("<br/>");
        PiwikDbData[] visitlist;

        //deserialize json array
        using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonData)))
        {
            DataContractSerializer serializer = new DataContractSerializer(typeof(PiwikDbData));

            visitlist = serializer.ReadObject(stream) as PiwikDbData[];
        }

        Response.Write(visitlist.Length);
    }

}

[DataContract]
class PiwikDbData
{
    [DataMember(Name = "idvisit", IsRequired = true)]
    public int idvisit;

    [DataMember(Name = "iduser", IsRequired = true)]
    public string iduser;

    [DataMember(Name = "idpage", IsRequired = true)]
    public int idpage;

    [DataMember(Name = "pagetime", IsRequired = true)]
    public int pageTime;
}

我在这里做错了什么。在visitlist = serializer.ReadObject(stream) as PiwikDbData[];显示“根级别的数据无效” 非常感谢帮助。感谢。

Answer 1

您正在使用为XML-Data制作的DataContractSerializer。
http://msdn.microsoft.com/de-de/library/system.runtime.serialization.datacontractserializer(v=vs.100).aspx

对于JSON-Data，您应该使用DataContractJsonSerializer：
http://msdn.microsoft.com/de-de/library/system.runtime.serialization.json.datacontractjsonserializer.aspx

您还尝试反序列化单个项目
new DataContractSerializer(typeof(PiwikDbData));
但你真正需要的是一系列物品
new DataContractSerializer(typeof(PiwikDbData[]));

这就是我的代码如何：

string jsonData = Request.Form[0];
Response.Write(jsonData);
Response.Write("<br/>");
PiwikDbData[] visitlist;

//deserialize json array
using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonData)))
{
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(PiwikDbData[]));
    visitlist = (PiwikDbData[])serializer.ReadObject(stream);
}

Response.Write(visitlist.Length);

Answer 2

只需下载JSON.NET，然后使用：

var wikiData = JsonConvert.DeserializeObject<List<PiwikDbData>>(jsonData);

这应该返回一个JArray对象，它将是List类型。

Answer 3

您尝试使用一个item元素解析json数组结果。

我认为正确的路线是：

...
using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonData)))
{
   DataContractSerializer serializer = new DataContractSerializer(typeof(List<PiwikDbData>));

   List<PiwikDbData>visitlist = serializer.ReadObject(stream);
}
...

Answer 4

使用以下代码：

    //deserialize json array
    using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonData)))
    {
        var serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(PiwikDbData[]));

        visitlist = serializer.ReadObject(stream) as PiwikDbData[];
    }

    Response.Write(visitlist.Length);

在asp.NET中解析JSON数组

4 个答案: