用c#解析JSON

public static T Deserialize<T>(string json)
{
using (MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
return (T)serializer.ReadObject(ms);
}
}

另外，仅供参考，下面是Serialize方法:

public static string Serialize<T>(T obj)
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
using (MemoryStream ms = new MemoryStream())
{
serializer.WriteObject(ms, obj);
return Encoding.Default.GetString(ms.ToArray());
}
}

编辑

如果你想使用Json。NET这里是等效的序列化/反序列化方法上面的代码。

反序列化:

JsonConvert.DeserializeObject<T>(string json);

序列化:

JsonConvert.SerializeObject(object o);

这已经是Json的一部分了。你可以在JsonConvert类中调用它们。

链接:用JSON序列化和反序列化JSON。净< / >

[DataMember]
public string unescapedUrl
{
get { return unescapedUrl; } // <= this line is causing a Stack Overflow
set { this.unescapedUrl = value; }
}

string _unescapedUrl; // <= private field


[DataMember]
public string unescapedUrl
{
get { return _unescapedUrl; }
set { _unescapedUrl = value; }
}

public string unescapedUrl { get; set;}

数据类与JSON对象不匹配。用这个代替:

[DataContract]
public class GoogleSearchResults
{
[DataMember]
public ResponseData responseData { get; set; }
}


[DataContract]
public class ResponseData
{
[DataMember]
public IEnumerable<Results> results { get; set; }
}


[DataContract]
public class Results
{
[DataMember]
public string unescapedUrl { get; set; }


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


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


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


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


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


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

同样，你不需要实例化类来获得反序列化的类型:

public static T Deserialise<T>(string json)
{
using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))
{
var serialiser = new DataContractJsonSerializer(typeof(T));
return (T)serialiser.ReadObject(ms);
}
}

我只是觉得整个例子都很有用。这是这个问题的例子。

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.ServiceModel.Web;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
using System.Collections.Generic;


public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
GoogleSearchResults g1 = new GoogleSearchResults();
const string json = @"{""responseData"": {""results"":[{""GsearchResultClass"":""GwebSearch"",""unescapedUrl"":""http://www.cheese.com/"",""url"":""http://www.cheese.com/"",""visibleUrl"":""www.cheese.com"",""cacheUrl"":""http://www.google.com/search?q\u003dcache:bkg1gwNt8u4J:www.cheese.com"",""title"":""\u003cb\u003eCHEESE\u003c/b\u003e.COM - All about \u003cb\u003echeese\u003c/b\u003e!."",""titleNoFormatting"":""CHEESE.COM - All about cheese!."",""content"":""\u003cb\u003eCheese\u003c/b\u003e - everything you want to know about it. Search \u003cb\u003echeese\u003c/b\u003e by name, by types   of milk, by textures and by countries.""},{""GsearchResultClass"":""GwebSearch"",""unescapedUrl"":""http://en.wikipedia.org/wiki/Cheese"",""url"":""http://en.wikipedia.org/wiki/Cheese"",""visibleUrl"":""en.wikipedia.org"",""cacheUrl"":""http://www.google.com/search?q\u003dcache:n9icdgMlCXIJ:en.wikipedia.org"",""title"":""\u003cb\u003eCheese\u003c/b\u003e - Wikipedia, the free encyclopedia"",""titleNoFormatting"":""Cheese - Wikipedia, the free encyclopedia"",""content"":""\u003cb\u003eCheese\u003c/b\u003e is a food consisting of proteins and fat from milk, usually the milk of   cows, buffalo, goats, or sheep. It is produced by coagulation of the milk \u003cb\u003e...\u003c/b\u003e""},{""GsearchResultClass"":""GwebSearch"",""unescapedUrl"":""http://www.ilovecheese.com/"",""url"":""http://www.ilovecheese.com/"",""visibleUrl"":""www.ilovecheese.com"",""cacheUrl"":""http://www.google.com/search?q\u003dcache:GBhRR8ytMhQJ:www.ilovecheese.com"",""title"":""I Love \u003cb\u003eCheese\u003c/b\u003e!, Homepage"",""titleNoFormatting"":""I Love Cheese!, Homepage"",""content"":""The American Dairy Association\u0026#39;s official site includes recipes and information   on nutrition and storage of \u003cb\u003echeese\u003c/b\u003e.""},{""GsearchResultClass"":""GwebSearch"",""unescapedUrl"":""http://www.gnome.org/projects/cheese/"",""url"":""http://www.gnome.org/projects/cheese/"",""visibleUrl"":""www.gnome.org"",""cacheUrl"":""http://www.google.com/search?q\u003dcache:jvfWnVcSFeQJ:www.gnome.org"",""title"":""\u003cb\u003eCheese\u003c/b\u003e"",""titleNoFormatting"":""Cheese"",""content"":""\u003cb\u003eCheese\u003c/b\u003e uses your webcam to take photos and videos, applies fancy special effects   and lets you share the fun with others. It was written as part of Google\u0026#39;s \u003cb\u003e...\u003c/b\u003e""}],""cursor"":{""pages"":[{""start"":""0"",""label"":1},{""start"":""4"",""label"":2},{""start"":""8"",""label"":3},{""start"":""12"",""label"":4},{""start"":""16"",""label"":5},{""start"":""20"",""label"":6},{""start"":""24"",""label"":7},{""start"":""28"",""label"":8}],""estimatedResultCount"":""14400000"",""currentPageIndex"":0,""moreResultsUrl"":""http://www.google.com/search?oe\u003dutf8\u0026ie\u003dutf8\u0026source\u003duds\u0026start\u003d0\u0026hl\u003den-GB\u0026q\u003dcheese""}}, ""responseDetails"": null, ""responseStatus"": 200}";
g1 = JSONHelper.Deserialise<GoogleSearchResults>(json);


foreach (Pages x in g1.responseData.cursor.pages)
{
// Anything you want to get
Response.Write(x.label);


}
}
}


public class JSONHelper
{
public static T Deserialise<T>(string json)
{
using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))
{
var serialiser = new DataContractJsonSerializer(typeof(T));
return (T)serialiser.ReadObject(ms);
}
}


public static string Serialize<T>(T obj)
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
using (MemoryStream ms = new MemoryStream())
{
serializer.WriteObject(ms, obj);
return Encoding.Default.GetString(ms.ToArray());
}
}
}


[DataContract]
public class GoogleSearchResults
{
[DataMember]
public ResponseData responseData { get; set; }


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


}




public class ResponseData
{
[DataMember]
public Cursor cursor { get; set; }


[DataMember]
public IEnumerable<Results> results { get; set; }




}




[DataContract]
public class Cursor
{
[DataMember]
public IEnumerable<Pages> pages { get; set; }
}






[DataContract]
public class Pages
{
[DataMember]
public string start { get; set; }


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


}




[DataContract]
public class Results
{
[DataMember]
public string unescapedUrl { get; set; }


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


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


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


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


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


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

我发现这种方法将JSON解析为动态对象，它扩展了DynamicObject和JavascriptConverter，将字符串转换为对象。

DynamicJsonObject

public class DynamicJsonObject : DynamicObject
{
private IDictionary<string, object> Dictionary { get; set; }


public DynamicJsonObject(IDictionary<string, object> dictionary)
{
this.Dictionary = dictionary;
}


public override bool TryGetMember(GetMemberBinder binder, out object result)
{
result = this.Dictionary[binder.Name];


if (result is IDictionary<string, object>)
{
result = new DynamicJsonObject(result as IDictionary<string, object>);
}
else if (result is ArrayList && (result as ArrayList) is IDictionary<string, object>)
{
result = new List<DynamicJsonObject>((result as ArrayList).ToArray().Select(x => new DynamicJsonObject(x as IDictionary<string, object>)));
}
else if (result is ArrayList)
{
result = new List<object>((result as ArrayList).ToArray());
}


return this.Dictionary.ContainsKey(binder.Name);
}
}

转换器

public class DynamicJsonConverter : JavaScriptConverter
{
public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
{
if (dictionary == null)
throw new ArgumentNullException("dictionary");


if (type == typeof(object))
{
return new DynamicJsonObject(dictionary);
}


return null;
}


public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
{
throw new NotImplementedException();
}


public override IEnumerable<Type> SupportedTypes
{
get { return new ReadOnlyCollection<Type>(new List<Type>(new Type[] { typeof(object) })); }
}
}

使用(示例json):

JavaScriptSerializer jss = new JavaScriptSerializer();
jss.RegisterConverters(new JavaScriptConverter[] { new DynamicJsonConverter() });


dynamic glossaryEntry = jss.Deserialize(json, typeof(object)) as dynamic;


Console.WriteLine("glossaryEntry.glossary.title: " + glossaryEntry.glossary.title);
Console.WriteLine("glossaryEntry.glossary.GlossDiv.title: " + glossaryEntry.glossary.GlossDiv.title);
Console.WriteLine("glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.ID: " + glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.ID);
Console.WriteLine("glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.GlossDef.para: " + glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.GlossDef.para);
foreach (var also in glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.GlossDef.GlossSeeAlso)
{
Console.WriteLine("glossaryEntry.glossary.GlossDiv.GlossList.GlossEntry.GlossDef.GlossSeeAlso: " + also);
}

此方法必须返回true，否则将抛出错误。例如，如果键不存在，可以抛出错误。

返回true并清空result将返回一个空值，而不会抛出错误。

public override bool TryGetMember(GetMemberBinder binder, out object result)
{


if (!this.Dictionary.ContainsKey(binder.Name))
{
result = "";
}
else
{
result = this.Dictionary[binder.Name];
}


if (result is IDictionary<string, object>)
{
result = new DynamicJsonObject(result as IDictionary<string, object>);
}
else if (result is ArrayList && (result as ArrayList) is IDictionary<string, object>)
{
result = new List<DynamicJsonObject>((result as ArrayList).ToArray().Select(x => new DynamicJsonObject(x as IDictionary<string, object>)));
}
else if (result is ArrayList)
{
result = new List<object>((result as ArrayList).ToArray());
}


return true; // this.Dictionary.ContainsKey(binder.Name);
}

我尝试使用上面的代码，但没有工作。谷歌返回的JSON结构非常不同，helper函数中有一个非常重要的缺失:调用DataContractJsonSerializer.ReadObject()，实际上将JSON数据反序列化为对象。

以下是2011年有效的代码:

using System;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
using System.Collections.Generic;


namespace <YOUR_NAMESPACE>
{
public class JSONHelper
{
public static T Deserialise<T>(string json)
{
T obj = Activator.CreateInstance<T>();
MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json));
DataContractJsonSerializer serialiser = new DataContractJsonSerializer(obj.GetType());
obj = (T)serialiser.ReadObject(ms);
ms.Close();
return obj;
}
}


public class Result
{
public string GsearchResultClass { get; set; }
public string unescapedUrl { get; set; }
public string url { get; set; }
public string visibleUrl { get; set; }
public string cacheUrl { get; set; }
public string title { get; set; }
public string titleNoFormatting { get; set; }
public string content { get; set; }
}


public class Page
{
public string start { get; set; }
public int label { get; set; }
}


public class Cursor
{
public string resultCount { get; set; }
public Page[] pages { get; set; }
public string estimatedResultCount { get; set; }
public int currentPageIndex { get; set; }
public string moreResultsUrl { get; set; }
public string searchResultTime { get; set; }
}


public class ResponseData
{
public Result[] results { get; set; }
public Cursor cursor { get; set; }
}


public class GoogleSearchResults
{
public ResponseData responseData { get; set; }
public object responseDetails { get; set; }
public int responseStatus { get; set; }
}
}

要获得第一个结果的内容，请执行以下操作:

GoogleSearchResults googleResults = new GoogleSearchResults();
googleResults = JSONHelper.Deserialise<GoogleSearchResults>(jsonData);
string contentOfFirstResult = googleResults.responseData.results[0].content;

public class GoogleSearchResults
{
[DataMember]
public ResponseData responseData { get; set; }


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


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

而且

 [DataContract]
public class ResponseData
{
[DataMember]
public List<Results> results { get; set; }
}

谷歌映射API请求，用c#解析定向响应，将url中的json更改为xml 并使用以下代码将结果转换为可用的c#泛型列表对象。< / p >

我花了点时间做的。但它在这里

var url = String.Format("http://maps.googleapis.com/maps/api/directions/xml?...");
var result = new System.Net.WebClient().DownloadString(url);
var doc = XDocument.Load(new StringReader(result));


var DirectionsResponse = doc.Elements("DirectionsResponse").Select(l => new
{
Status = l.Elements("status").Select(q => q.Value).FirstOrDefault(),
Route = l.Descendants("route").Select(n => new
{
Summary = n.Elements("summary").Select(q => q.Value).FirstOrDefault(),
Leg = n.Elements("leg").ToList().Select(o => new
{
Step = o.Elements("step").Select(p => new
{
Travel_Mode = p.Elements("travel_mode").Select(q => q.Value).FirstOrDefault(),
Start_Location = p.Elements("start_location").Select(q => new
{
Lat = q.Elements("lat").Select(r => r.Value).FirstOrDefault(),
Lng = q.Elements("lng").Select(r => r.Value).FirstOrDefault()
}).FirstOrDefault(),
End_Location = p.Elements("end_location").Select(q => new
{
Lat = q.Elements("lat").Select(r => r.Value).FirstOrDefault(),
Lng = q.Elements("lng").Select(r => r.Value).FirstOrDefault()
}).FirstOrDefault(),
Polyline = p.Elements("polyline").Select(q => new
{
Points = q.Elements("points").Select(r => r.Value).FirstOrDefault()
}).FirstOrDefault(),
Duration = p.Elements("duration").Select(q => new
{
Value = q.Elements("value").Select(r => r.Value).FirstOrDefault(),
Text = q.Elements("text").Select(r => r.Value).FirstOrDefault(),
}).FirstOrDefault(),
Html_Instructions = p.Elements("html_instructions").Select(q => q.Value).FirstOrDefault(),
Distance = p.Elements("distance").Select(q => new
{
Value = q.Elements("value").Select(r => r.Value).FirstOrDefault(),
Text = q.Elements("text").Select(r => r.Value).FirstOrDefault(),
}).FirstOrDefault()
}).ToList(),
Duration = o.Elements("duration").Select(p => new
{
Value = p.Elements("value").Select(q => q.Value).FirstOrDefault(),
Text = p.Elements("text").Select(q => q.Value).FirstOrDefault()
}).FirstOrDefault(),
Distance = o.Elements("distance").Select(p => new
{
Value = p.Elements("value").Select(q => q.Value).FirstOrDefault(),
Text = p.Elements("text").Select(q => q.Value).FirstOrDefault()
}).FirstOrDefault(),
Start_Location = o.Elements("start_location").Select(p => new
{
Lat = p.Elements("lat").Select(q => q.Value).FirstOrDefault(),
Lng = p.Elements("lng").Select(q => q.Value).FirstOrDefault()
}).FirstOrDefault(),
End_Location = o.Elements("end_location").Select(p => new
{
Lat = p.Elements("lat").Select(q => q.Value).FirstOrDefault(),
Lng = p.Elements("lng").Select(q => q.Value).FirstOrDefault()
}).FirstOrDefault(),
Start_Address = o.Elements("start_address").Select(q => q.Value).FirstOrDefault(),
End_Address = o.Elements("end_address").Select(q => q.Value).FirstOrDefault()
}).ToList(),
Copyrights = n.Elements("copyrights").Select(q => q.Value).FirstOrDefault(),
Overview_polyline = n.Elements("overview_polyline").Select(q => new
{
Points = q.Elements("points").Select(r => r.Value).FirstOrDefault()
}).FirstOrDefault(),
Waypoint_Index = n.Elements("waypoint_index").Select(o => o.Value).ToList(),
Bounds = n.Elements("bounds").Select(q => new
{
SouthWest = q.Elements("southwest").Select(r => new
{
Lat = r.Elements("lat").Select(s => s.Value).FirstOrDefault(),
Lng = r.Elements("lng").Select(s => s.Value).FirstOrDefault()
}).FirstOrDefault(),
NorthEast = q.Elements("northeast").Select(r => new
{
Lat = r.Elements("lat").Select(s => s.Value).FirstOrDefault(),
Lng = r.Elements("lng").Select(s => s.Value).FirstOrDefault()
}).FirstOrDefault(),
}).FirstOrDefault()
}).FirstOrDefault()
}).FirstOrDefault();

我希望这能帮助到一些人。