SilverlightShow: JSON serialization and deserialization in Silverlight Comments

RE: JSON serialization and deserialization in Silverlight

Jim — Tue, 23 Nov 2010 17:02:59 GMT

If you want code to serialize and deserialize Java objects, without any configuration, extra definition files, etc. check out http://code.google.com/p/json-io/. We use this code on our servers to process JSON sent by our clients, and to send back JSON responses to our client applications. We've found this to handle anything object graph we've thrown at it, and it is extremely quick.

RE: JSON serialization and deserialization in Silverlight

Mani — Tue, 16 Nov 2010 15:51:53 GMT

This will work in SL3 also.

You only need to reference System.ServiceModel.Web to use the DataContractJsonSerializer, not the System.Runtime.Serialization.Json.

RE: JSON serialization and deserialization in Silverlight

Robert MacLean — Thu, 11 Nov 2010 11:28:32 GMT

You do not need to close/dispose your stream in the serialise example, the reader will do that for you. In your case you risk disposing the stream twice.

RE: JSON serialization and deserialization in Silverlight

Toby — Sat, 10 Apr 2010 00:46:23 GMT

don't know if anyone tried the C# code but it doesn't compile and it generates XML not JSON.

Also, it always serializes a list that includes the object type and instantiates that type when deserializing.

Try this:

public string GetStringFromMemoryStream(MemoryStream m)

{

if ((m == null) || m.Length == 0)

{

return "";

}

m.Flush();

m.Position = 0;

var UTF8 = UTF8Encoding.UTF8;

StreamReader sr = new StreamReader(m, UTF8Encoding.UTF8);

string s = sr.ReadToEnd();

return s;

}

public MemoryStream GetMemoryStreamFromString(string s)

{

if ((s == null) || s.Length == 0)

{

return null;

}

var a = System.Text.Encoding.UTF8.GetBytes(s);

System.IO.MemoryStream m = new System.IO.MemoryStream(a, true);

m.Position = 0;

return m;

}

public string Serialize(object BaseType)

{

var ExactName = BaseType.GetType().AssemblyQualifiedName;

string Ser = p_Serialize(BaseType);

List<string> oList = new List<string>();

oList.Add(ExactName);

oList.Add(Ser);

return p_Serialize(oList);

}

private string p_Serialize(object BaseType)

{

if (BaseType == null)

{

throw new ArgumentNullException("No object to serialize");

}

DataContractJsonSerializer dcs = new DataContractJsonSerializer(BaseType.GetType());

MemoryStream ms = new MemoryStream();

dcs.WriteObject(ms, BaseType);

return Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Position);

}

public object Deserialize(string s)

{

List<string> oList = new List<string>();

oList = (List<string>)p_Deserialize(s, oList);

object Instance = Activator.CreateInstance(Type.GetType(oList[0]));

return p_Deserialize(oList[1], Instance);

}

public object p_Deserialize(string s, object BaseType)

{

DataContractJsonSerializer dcs = new DataContractJsonSerializer(BaseType.GetType());

MemoryStream m = GetMemoryStreamFromString(s);

BaseType = dcs.ReadObject(m);

return BaseType;

}

RE: JSON serialization and deserialization in Silverlight

Ross Brodskiy — Thu, 15 Oct 2009 02:46:32 GMT

| the C# version...

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

public class Conversion
{
    public string GetStringFromMemoryStream(MemoryStream m)
    {
        if ((m == null) | m.Length == 0) {
            return "";
        }
        m.Flush();
        m.Position = 0;
        var UTF8 = UTF8Encoding.UTF8;
        StreamReader sr = new StreamReader(m, UTF8Encoding.UTF8);
        string s = sr.ReadToEnd();
        return s;
    }
    public MemoryStream GetMemoryStreamFromString(string s)
    {
        if ((s == null) | s.Length == 0) {
            return null;
        }
        var a = System.Text.Encoding.UTF8.GetBytes(s);
        System.IO.MemoryStream m = new System.IO.MemoryStream(a, true);
        m.Position = 0;
        return m;
    }
    public string Serialize(object BaseType)
    {
        var ExactName = BaseType.GetType.AssemblyQualifiedName;
        string Ser = p_Serialize(BaseType);
        List oList = new List();
        oList.Add(ExactName);
        oList.Add(Ser);
        return p_Serialize(oList);
    }
    private string p_Serialize(object BaseType)
    {
        if (BaseType == null) {
            throw new ArgumentNullException("your Object IsNothing to me!");
        }
        DataContractSerializer dcs = new DataContractSerializer(BaseType.GetType());
        MemoryStream ms = new MemoryStream();
        dcs.WriteObject(ms, BaseType);
        return Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Position);
    }
    public object Deserialize(string s)
    {
        List oList = new List();
        oList = p_Deserialize(s, oList);
        object Instance = Activator.CreateInstance(Type.GetType(oList.Item(0)));
        return p_Deserialize(oList.Item(1), Instance);
    }
    public object p_Deserialize(string s, object BaseType)
    {
        DataContractSerializer dcs = new DataContractSerializer(BaseType.GetType());
        MemoryStream m = GetMemoryStreamFromString(s);
        BaseType = dcs.ReadObject(m);
        return BaseType;
    }
}

RE: JSON serialization and deserialization in Silverlight

Ross Brodskiy — Thu, 15 Oct 2009 02:44:32 GMT

Yes it doesn't work with 3.0 :( so here is new utility class I just had to write...

Imports System.IO
Imports System.Text
Imports System.Runtime.Serialization

Public Class Conversion
    Public Function GetStringFromMemoryStream(ByVal m As MemoryStream) As String
        If (m Is Nothing) Or m.Length = 0 Then
            Return ""
        End If
        m.Flush()
        m.Position = 0
        Dim UTF8 = UTF8Encoding.UTF8
        Dim sr As New StreamReader(m, UTF8Encoding.UTF8)
        Dim s As String = sr.ReadToEnd()
        Return s
    End Function
    Public Function GetMemoryStreamFromString(ByVal s As String) As MemoryStream
        If (s Is Nothing) Or s.Length = 0 Then
            Return Nothing
        End If
        Dim a = System.Text.Encoding.UTF8.GetBytes(s)
        Dim m As New System.IO.MemoryStream(a, True)
        m.Position = 0
        Return m
    End Function
    Public Function Serialize(ByVal BaseType As Object) As String
        Dim ExactName = BaseType.GetType.AssemblyQualifiedName
        Dim Ser As String = p_Serialize(BaseType)
        Dim oList As New List(Of String)
        oList.Add(ExactName)
        oList.Add(Ser)
        Return p_Serialize(oList)
    End Function
    Private Function p_Serialize(ByVal BaseType As Object) As String
        If BaseType Is Nothing Then
            Throw New ArgumentNullException("your Object IsNothing to me!")
        End If
        Dim dcs As New DataContractSerializer(BaseType.[GetType]())
        Dim ms As New MemoryStream()
        dcs.WriteObject(ms, BaseType)
        Return Encoding.UTF8.GetString(ms.GetBuffer(), 0, CInt(ms.Position))
    End Function
    Public Function Deserialize(ByVal s As String) As Object
        Dim oList As New List(Of String)
        oList = p_Deserialize(s, oList)
        Dim Instance As Object = Activator.CreateInstance(Type.GetType(oList.Item(0)))
        Return p_Deserialize(oList.Item(1), Instance)
    End Function
    Public Function p_Deserialize(ByVal s As String, ByVal BaseType As Object) As Object
        Dim dcs As New DataContractSerializer(BaseType.GetType())
        Dim m As MemoryStream = GetMemoryStreamFromString(s)
        BaseType = dcs.ReadObject(m)
        Return BaseType
    End Function
End Class

RE: JSON serialization and deserialization in Silverlight

Navedac — Sun, 06 Sep 2009 16:10:08 GMT

Do not work with SL3 release.

One Idéa ?

Yvan

RE: JSON serialization and deserialization in Silverlight

Ross Brodskiy — Thu, 23 Apr 2009 16:38:17 GMT

Heres much more organized way of doing the same, plus it give you ability to Serialize and deSerialize into that precise same object! Thats can be important in may instances.Imports System
Imports System.Xml
Imports System.Xml.Linq
Imports System.Collections.Generic
Imports System.Runtime.Serialization.Json

Imports System.IO
Imports System.Text
Imports System.Runtime.Serialization

Partial Public Class Serializer
'''

''' Takes a MemoryStream and creates string
'''

    '''
    '''
    Public Function GetStringFromMemoryStream(ByVal m As MemoryStream) As String
        If (m Is Nothing) Or m.Length = 0 Then
            Return ""
        End If
        m.Flush()
        m.Position = 0
        Dim UTF8 = UTF8Encoding.UTF8
        Dim sr As New StreamReader(m, UTF8Encoding.UTF8)
        Dim s As String = sr.ReadToEnd()
        Return s
    End Function
    '''

''' Takes a string and creates MemoryStream
'''

    '''
    '''
    Public Function GetMemoryStreamFromString(ByVal s As String) As MemoryStream
        If (s Is Nothing) Or s.Length = 0 Then
            Return Nothing
        End If
        Dim a = System.Text.Encoding.UTF8.GetBytes(s)
        Dim m As New System.IO.MemoryStream(a, True)
        m.Position = 0
        Return m
    End Function
    '''

''' JSON Serialize an object into
'''

    '''
    '''
    Public Function Serialize(ByVal BaseType As Object) As String
        Dim ExactName = BaseType.GetType.AssemblyQualifiedName
        Dim Sur As String = p_Serialize(BaseType)
        Dim oList As New List(Of String)
        oList.Add(ExactName)
        oList.Add(Sur)
        Return p_Serialize(oList)
    End Function
    Private Function p_Serialize(ByVal BaseType As Object) As String
        Dim ser As New DataContractJsonSerializer(BaseType.[GetType]())
        Dim m As New MemoryStream()
        m.Position = 0
        ser.WriteObject(m, BaseType)
        Return GetStringFromMemoryStream(m)
    End Function
    '''

''' JSON Deserialize
'''

    '''
    '''
    '''
    Public Function Deserialize(ByVal s As String) As Object
        Dim oList As New List(Of String)
        oList = p_Deserialize(s, oList.GetType)
        Return p_Deserialize(oList.Item(1), Type.GetType(oList.Item(0)))

End Function

    Private Function p_Deserialize(ByVal s As String, ByVal BaseType As Object) As Object
        Dim ser As New DataContractJsonSerializer(BaseType)
        Dim m As MemoryStream = GetMemoryStreamFromString(s)
        m.Position = 0

Return ser.ReadObject(m)
End Function
End Class

RE: JSON serialization and deserialization in Silverlight

ad — Thu, 02 Apr 2009 08:32:47 GMT

гавно

RE: JSON serialization and deserialization in Silverlight

Satya N. — Fri, 31 Oct 2008 04:54:23 GMT

Good stuff.

RE: JSON serialization and deserialization in Silverlight

Bradford — Thu, 21 Aug 2008 19:42:01 GMT

Beautiful - works like a charm. Thank you!

RE: JSON serialization and deserialization in Silverlight

Sergei meleshchuk — Wed, 20 Aug 2008 10:56:47 GMT

Cool and clear; Thanks