Subscribe RSS FeedIts very easy to serialize an object to .NET
Simply create some object, normally a custom class with some attributes.
Normally you have a list of these and you want to serialize to JSON to use it from client side code.
If you do the following
var s = new System.Web.Script.Serialization.JavaScriptSerializer(); string resultJs = s.Serialize(result);
you will end up with a JSON array that you were looking for:
[
{ "Desc" : "Corn 100 ",
"ItemNo" : "123456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.21
} ,
{ "Desc" : "Ice 100 ",
"ItemNo" : "323456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.50
} ,
{ "Desc" : "Meat 100 ",
"ItemNo" : "423456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.11
}
]
However if you try to deserialize this back into an object by running
var json = new System.Web.Script.Serialization.JavaScriptSerializer();
var result = json.Deserialize<ShoppingCartItem[]>(jsonItemArray);
You will get a NULL type Exception.
The solution is to create a simple resolver as follows
using System;
using System.Web;
using System.Web.Compilation;
using System.Web.Script.Serialization;
namespace XYZ.Util
{
/// <summary>
/// as __type is missing ,we need to add this
/// </summary>
public class ManualResolver : SimpleTypeResolver
{
public ManualResolver() { }
public override Type ResolveType(string id)
{
return System.Web.Compilation.BuildManager.GetType(id, false);
}
}
}
2) Use it to serialize
var s = new System.Web.Script.Serialization.JavaScriptSerializer(new XYZ.Util.ManualResolver());
string resultJs = s.Serialize(result);
lblJs.Text = string.Format("<script>var resultObj = {0};</script>", resultJs);
You will get something like the following this time (note new __type included this time)
[
{
"__type":"XYZ.Data.Entities.ShoppingCartItem, XYZ.Data, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null",
"Desc" : "Corn 100 ",
"ItemNo" : "123456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.21
} ,
{
"__type":"XYZ.Data.Entities.ShoppingCartItem, XYZ.Data, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null",
"Desc" : "Ice 100 ",
"ItemNo" : "323456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.50
} ,
{
"__type":"XYZ.Data.Entities.ShoppingCartItem, XYZ.Data, Version=1.7.1.0, Culture=neutral, PublicKeyToken=null",
"Desc" : "Meat 100 ",
"ItemNo" : "423456",
"OriginalQty" : 50,
"Qty" : 50,
"UnitPrice" : 10.11
}
]
3) Use it to deserialize
System.Web.Script.Serialization.JavaScriptSerializer(new XYZ.Util.ManualResolver());
var result = json.Deserialize<ShoppingCartItem[]>(jsonItemArray);
References: Comment by Manuel Abadia on ASP.NET AJAX Extensions Internals – Web Service Proxy Generation
