Customizing the system's data classes (Info objects)

using System;
using System.Collections.Generic;

using CMS.Base;

public class SiteRegistrationData : IDataContainer
{
    private string mSiteOwner = null;
    private DateTime mSiteValidUntil = DateTime.MinValue;

    /// <summary>
    /// Gets or sets the name of the site owner.
    /// </summary>
    public string SiteOwner
    {
        get
        {
            return mSiteOwner;
        }
        set
        {
            mSiteOwner = value;
        }
    }

    /// <summary>
    /// Gets or sets the date until which the site is valid.
    /// </summary>
    public DateTime SiteValidUntil
    {
        get
        {
            return mSiteValidUntil;
        }
        set
        {
            mSiteValidUntil = value;
        }
    }

    /// <summary>
    /// Gets a list of column names.
    /// </summary>
    public List<string> ColumnNames
    {
        get
        {
            return new List<string>() { "SiteOwner", "SiteValidUntil" };
        }
    }

    /// <summary>
    /// Returns true if the class contains the specified column.
    /// </summary>
    /// <param name="columnName"></param>
    public bool ContainsColumn(string columnName)
    {
        switch (columnName.ToLower())
        {
            case "siteowner":
            case "sitevaliduntil":
                return true;
            default:
                return false;
        }
    }

    /// <summary>
    /// Gets the value of the specified column.
    /// </summary>
    /// <param name="columnName">Column name</param>
    public object GetValue(string columnName)
    {
        switch (columnName.ToLower())
        {
            case "siteowner":
                return mSiteOwner;

            case "sitevaliduntil":
                return mSiteValidUntil;

            default:
                return null;
        }
    }

    /// <summary>
    /// Sets the value of the specified column.
    /// </summary>
    /// <param name="columnName">Column name</param>
    /// <param name="value">New value</param>
    public bool SetValue(string columnName, object value)
    {
        switch (columnName.ToLower())
        {
            case "siteowner":
                mSiteOwner = (string)value;
                return true;

            case "sitevaliduntil":
                mSiteValidUntil = (DateTime)value;
                return true;

            default:
                return false;
        }
    }

    /// <summary>
    /// Returns a boolean value indicating whether the class contains the specified column.
    /// Passes on the specified column's value through the second parameter.
    /// </summary>
    /// <param name="columnName">Column name</param>
    /// <param name="value">Return value</param>
    public bool TryGetValue(string columnName, out object value)
    {
        switch (columnName.ToLower())
        {
            case "siteowner":
                value = mSiteOwner;
                return true;

            case "sitevaliduntil":
                value = mSiteValidUntil;
                return true;

            default:
                value = null;
                return false;
        }
    }

    /// <summary>
    /// Gets or sets the value of the column.
    /// </summary>
    /// <param name="columnName">Column name</param>
    public object this[string columnName]
    {
        get
        {
            return GetValue(columnName);
        }
        set
        {
            SetValue(columnName, value);
        }
    }    
}

using System;

using CMS;
using CMS.DataEngine;
using CMS.SiteProvider;

// Registers the custom module into the system
[assembly: RegisterModule(typeof(CustomSiteDataModule))]

public class CustomSiteDataModule : Module
{
    // Module class constructor, the system registers the module under the name "CustomSiteData"
    public CustomSiteDataModule()
        : base("CustomSiteData")
    {
    }

    // Contains initialization code that is executed when the application starts
    protected override void OnInit()
    {
        base.OnInit();

        // Assigns a handler to the OnLoadRelatedData event of the SiteInfo object type
        SiteInfo.TYPEINFO.OnLoadRelatedData += SiteInfo_OnLoadRelatedData;
    }

    // Handler method for the OnLoadRelatedData event of the SiteInfo class
    // Gets the related data from the custom storage class (must implement the IDataContainer interface)
    static object SiteInfo_OnLoadRelatedData(BaseInfo infoObj)
    {
        SiteRegistrationData siteData = new SiteRegistrationData();

        siteData.SiteOwner = "John Smith";
        siteData.SiteValidUntil = DateTime.Now.AddDays(1);

        return siteData;
    }
}

@using CMS.SiteProvider

@{SiteInfo currentSite = SiteContext.CurrentSite;}

<p>
    Site @currentSite.DisplayName is valid until @currentSite.GetValue("SiteValidUntil") and owned by @currentSite.GetValue("SiteOwner")
</p>