Criteria Class with Silverlight CSLA 3.6

Any CSLA class in SL must have a public parameterless constructor.  There are no exceptions to this rule, including criteria classes.  This requirement stems out of reflection restrictions in Silverlight.

Sergey Barskiy

Principal Consultant

office: 678.405.0687 | mobile: 404.388.1899

Microsoft Worldwide Partner of the Year | Custom Development Solutions, Technical Innovation

Hi all

I am writing a silverlight app using CLSA 3.6.

I have recoded the templates for CLSAGen to create the correct files as required.

However I am having a bit of an issue with the criteria class. I have created a class as detailed in the book.

[Serializable()]
protected class CriteriaSystemUser : CriteriaBase
{

   private string _USR_Login;
   public string USR_Login {
      get { return _USR_Login; }
   }

   public CriteriaSystemUser(String uSR_Login)
   :base(typeof(CriteriaSystemUser))
   {
      _USR_Login = uSR_Login;
   }

}

protected void DataPortal_Fetch(CriteriaSystemUser crit)
{
using (SqlConnection cn = new SqlConnection(DataBase.MakingSpaceOperationsConnection))
{
using (SqlCommand cmd = cn.CreateCommand())
{
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "JM_ServiceCentre_ListBySystemUser";
cmd.Parameters.AddWithValue("@USR_Login", crit.USR_Login);

.........

But If i run this I get a no parameterless constructor defined for this object error

So I then add a constructor

private CriteriaSystemUser()

:base(typeof(CriteriaSystemUser))

{

}

which now runs succesfully but although the USR_Login value gets set in the class. It is not passed through to the dataportal fetch

Any ideas would be most helpful, I have gone back to using the singlecriteria which works fine for now.

Cheers

Daniel

Alternatively, you can inherit from CriteriaBase and use RegisterProperty syntax to register custom properties.  This method is probably more consistent with other CSLA classes.

Sergey Barskiy

Principal Consultant

office: 678.405.0687 | mobile: 404.388.1899

Microsoft Worldwide Partner of the Year | Custom Development Solutions, Technical Innovation

You will need to add these lines to the client version of CriteriaSystemUser.


    #region MobileFormatter

    /// <summary>
    /// Override this method to insert your field values
    /// into the MobileFormatter serialzation stream.
    /// </summary>
    /// <param name="info">
    /// Object containing the data to serialize.
    /// </param>
    /// <param name="mode">
    /// The StateMode indicating why this method was invoked.
    /// </param&a mp;gt;
    protected override void OnGetState(SerializationInfo info, StateMode mode)
    {
      base.OnGetState(info, mode);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; info.AddValue("Csla.Silverlight.</font></font><font face="Tahoma"><font size="2">CriteriaSystemUser</font></font><font face="Tahoma"><font size="2">._USR_Login", _USR_Login);
</font></font><font face="Tahoma"><font size="2">&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; /// &lt;summary&gt;
&nbsp;&nbsp;&nbsp; /// Override this method to retrieve your field values
&nbsp;&nbsp;&nbsp; /// from the MobileFormatter serialzation stream.
&nbsp;&nbsp;&nbsp; /// & amp;lt;/summary&gt;
&nbsp;&nbsp;&nbsp; /// &lt;param name="info"&gt;
&nbsp;&nbsp;&nbsp; /// Object containing the data to serialize.
&nbsp;&nbsp;&nbsp; /// &lt;/param&gt;
&nbsp;&nbsp;&nbsp; /// &lt;param name="mode"&gt;
&nbsp;&nbsp;&nbsp; /// The StateMode indicating why this method was invoked.
&nbsp;&nbsp;&nbsp; /// &lt;/param&gt;
&nbsp;&nbsp;&nbsp; protected override void OnSetState(SerializationInfo info, StateMode mode)
&nbsp;&nbsp;&nbsp; {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; base.OnSetState(info, mode);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; _</font></font><font face="Tahoma"><font size="2">_USR_Login </font></font><font face="Tahoma"><font size="2">= info.G etValue&lt;int&gt;("Csla.Silverlight.</font></font><font face="Tahoma"><font size="2">CriteriaSystemUser</font></font><font face="Tahoma"><font size="2">._USR_Login");
&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; #endregion

Here is an example of how to use Criteria class for Silverlight inheriting from CriteriaBase.  This specific class is embedded inside a ROLB class, but you can have it as external / stand alone class as well.

[Serializable]

        public class Criteria : CriteriaBase

        {

            private static PropertyInfo<string> SearchProperty = RegisterProperty<string>(typeof(Criteria), new PropertyInfo<string>("Search", "Search"));

            public string Search

            {

                get { return ReadProperty(SearchProperty); }

            }

            private static PropertyInfo<bool> IncludeAddressProperty = RegisterProperty<bool>(typeof(Criteria), new PropertyInfo<bool>("IncludeAddress", "IncludeAddress"));

            public bool IncludeAddress

            {

                get { return ReadProperty(IncludeAddressProperty); }

            }

            public Criteria(Type type, string search, bool includeAddress)

                : base(type)

            {

                LoadProperty(SearchProperty, search);

                LoadProperty(IncludeAddressProperty, includeAddress);

            }

            public Criteria() { }

        }

Here is how to use it:

public static void GetReadonlySearchedPersonList(string search, bool includeAddress, EventHandler<DataPortalResult<ReadonlySearchedPersonList>> handler)

        {

            DataPortal<ReadonlySearchedPersonList> dp = new DataPortal<ReadonlySearchedPersonList>();

            dp.FetchCompleted += handler;

            dp.BeginFetch((new Criteria(typeof(ReadonlySearchedPersonList), search, includeAddress)));

        }

private void DataPortal_Fetch(Criteria criteria)

        {

….

Sergey Barskiy

Principal Consultant

office: 678.405.0687 | mobile: 404.388.1899

Microsoft Worldwide Partner of the Year | Custom Development Solutions, Technical Innovation

Daniel,

Could you post code to help me out with same issue?

Cheers

Terry