Everything appears to be working now (!!!) so I just wanted to share my
experience in case others come across a similar issue.
I have many custom objects MyDataClass1, MyDataClass2, MyDataClass3,
etc, all of which are derived from BaseData class which adds lots of DB
related functionality.
So to be able to load my objects from DB and return them back from a
server side Ajax method I had to do the following:
1. Create a custom converter BaseDataConverter (see code below) that
only serializes public properties based on a certain attribute.
2. Update web.config jsonConverters section as follows:
<add type="MyNamespace.BaseDataConverter,MyAssemblyName"/>
3. Use my data object in Ajax method:
[AjaxPro.AjaxMethod()]
public MyDataClass1 AjaxLoadMyObject(int pk)
{
MyDataClass1 myObj = null;
try
{
myObj = new MyDataClass1();
myObj.Load(pk);
}
catch (Exception ex)
{
// log error
}
return myObj;
}
It is that simple!
Hope this helps anyone else looking at how to return your custom
objects from ajax methods.
/*** BaseDataConverter sample code **********.
public class BaseDataConverter : IJavaScriptConverter
{
public BaseDataConverter() : base()
{
m_AllowInheritance = true;
// list all data types that can be serialized
m_serializableTypes = new Type[] {
typeof(MyDataClass1),
typeof(MyDataClass2)
// etc...
// or you can only leave typeof(BaseData) and
make sure
// that m_AllowInheritance is set to true
// doing that will obviously be slower though
!!!
};
}
public override string Serialize(object o)
{
StringBuilder sb = new StringBuilder();
Serialize(o, sb);
return sb.ToString();
}
public override void Serialize(object o, StringBuilder sb)
{
bool b = true;
Type type = o.GetType();
sb.Append('{');
sb.Append("\"__type\":");
JavaScriptUtil.QuoteString(type.AssemblyQualifiedName, sb);
b = false;
// find members
MemberFilter memberFilter = new
MemberFilter(BaseDataConverter.FilterFindMembers);
MemberInfo[] members = type.FindMembers(MemberTypes.Property,
BindingFlags.Instance | BindingFlags.Public, memberFilter, null);
string[] mappedMembers = new string[members.Length];
for (int i = 0; i < mappedMembers.Length; i++)
{
mappedMembers[i] = members[i].Name;
}
// get values
foreach (string mappedMember in mappedMembers)
{
if(!b) sb.Append(",");
JavaScriptUtil.QuoteString(mappedMember, sb);
sb.Append(':');
JavaScriptSerializer.Serialize(type.GetProperty(mappedMember).GetValue(o,
null), sb);
}
sb.Append('}');
}
private static bool FilterFindMembers(MemberInfo mi, Object search)
{
object[] attribs =
mi.GetCustomAttributes(typeof(ControlTypeAttribute), true);
if (attribs != null)
if (attribs.Length > 0)
return true;
return false;
}
}
-- Dima.
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