Composite Pattern issue using deserialization : The Official Microsoft ASP.NET Forums

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sinedyip

Member

308 Points

154 Posts

Composite Pattern issue using deserialization

Nov 30, 2012 03:12 PM|LINK

Hi Team,

I am having a problem trying to deserialize a JSON using my classes. I create a JSON retrun a my custom type in my WEN API controller (gert method) and it is creating the JSON weel however when I am trying to desearilze I have an error in bold bellow.

I am following the pattern from here to create my object (http://www.dofactory.com/Patterns/PatternComposite.aspx#_self1) which then in my model I create a list of this objects and that final object(model) is what I expose in my get as JSON.

I just try the same example with the classes on the link and it works properly so I dont have club. Thank you very much for the help in advance

This part of my code

....

Controller

public ValuesModel Get(int id, int displayFieldID)
{
ValuesModel dataValue = new ValuesModel(id, displayFieldID);

//-------------------------------------Test--------------------------------------------------

string json = JsonConvert.SerializeObject(ipFilterControlDataValue); //GOOD

ValuesModel deserializedValues = JsonConvert.DeserializeObject<ValuesModel>(json); //ERROR HERE

Models

public class ValuesModel:BaseModel
{
public List<FilterControlValuesChild> ListOfFilterValues = new List<FilterControlValuesChild>();

public ValuesModel(int scheduleID, int diplayFieldID)

{
DataTable dataTableValues = new DataTable();
dataTableValues = GetValuesByDisplayScheduleIDFieldIDTable(scheduleID, diplayFieldID);

ProcessValueTable(dataTableValues); // Update the object -> ListOfFilterValues
}

public IPFilterValuesModel()
{
ListOfFilterValues.Add(new FilterControlValuesChild(string.Empty, string.Empty, null));

}

My class Parent child relation

abstract public class FilterControlValuesParent
{
#region Properties
protected string valueID;
protected string displayValue;
protected Dictionary<string, string> extraControlProperties;

public string ValueID
{
get
{
return valueID;
}
set
{
valueID = value;
}
}
public string DisplayValue
{
get
{
return displayValue;
}
set
{
displayValue = value;
}
}
public Dictionary<string, string> ExtraControlProperties
{
get
{
return extraControlProperties;
}
set
{
extraControlProperties = value;
}
}
#endregion

#region Contructors
public FilterControlValuesParent()
{
this.valueID = string.Empty;
this.displayValue = string.Empty;
this.extraControlProperties = null;
}
public FilterControlValuesParent(string valueID, string displayValue, Dictionary<string, string> extraProperties)
{
this.valueID = valueID;
this.displayValue = displayValue;
this.extraControlProperties = extraProperties;
}
#endregion

#region Methods
public abstract void Add(FilterControlValuesParent filterCrtlValueParent);
public abstract void Remove(FilterControlValuesParent filterCrtlValueParent);
public abstract void Get(int depth);
public abstract void Get();
#endregion
}

public class FilterControlValuesChild: FilterControlValuesParent
{
#region Properties
public List<FilterControlValuesParent> filterControlValueChild = new List<FilterControlValuesParent>();
#endregion

#region Constructors
public FilterControlValuesChild()
: base()
{

}
public FilterControlValuesChild(string valueID, string displayValue, Dictionary<string, string> extraProperties)
: base(valueID, displayValue, extraProperties)
{

}

#endregion

#region Methods

public override void Add(FilterControlValuesParent filterCrtlValueParent)
{
filterControlValueChild.Add(filterCrtlValueParent);
}

public override void Remove(FilterControlValuesParent filterCrtlValueParent)
{
filterControlValueChild.Remove(filterCrtlValueParent);
}

public override void Get(int depth)
{
//TODO: Work in this method
int itemp = 0;
itemp++;
string tempstring = itemp.ToString();

foreach (FilterControlValuesParent filterCrtlValueParent in filterControlValueChild)
{
filterCrtlValueParent.Get(depth + 2);
}
}
public override void Get()
{
throw new NotImplementedException();
}

#endregion

....

BSEE, MCTS.

Reply

sinedyip

Member

308 Points

154 Posts

Re: Composite Pattern issue using deserialization

Nov 30, 2012 03:38 PM|LINK

When I create a nested object is when I have the proble basaccly is when I am trying to desealize the

json like this:

{
"ListOfFilterValues": [{
"filterControlValueChild": [{
"filterControlValueChild": [],
"ValueID": "5",
"DisplayValue": "Orlando",
"ExtraControlProperties": null
}],
"ValueID": "4",
"DisplayValue": "FL",
"ExtraControlProperties": null
},
{
"filterControlValueChild": [],
"ValueID": "7",
"DisplayValue": "NY",
"ExtraControlProperties": null
},
{
"filterControlValueChild": [],
"ValueID": "8",
"DisplayValue": "WA",
"ExtraControlProperties": null
},
{
"filterControlValueChild": [],
"ValueID": "9",
"DisplayValue": "Tacoma",
"ExtraControlProperties": null
}]
}