Azure: support more types in azure table entities.

RichTypeTableEntity.cs

using System;
using System.Collections.Generic;
using System.Linq;

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Table;

/// <summary>
/// The table entities that extend from this type will have rich support in property types.
/// </summary>
public class RichTypeTableEntity : TableEntity
{
    /// <inheritdoc/>
    public override void ReadEntity(IDictionary<string, EntityProperty> properties, OperationContext operationContext)
    {
        base.ReadEntity(properties, operationContext);

        foreach (var thisProperty in
            GetType().GetProperties().Where(thisProperty =>
                thisProperty.GetType() != typeof(string) &&
                properties.ContainsKey(thisProperty.Name) &&
                properties[thisProperty.Name].PropertyType == EdmType.String))
        {
            var parse = thisProperty.PropertyType.GetMethods().SingleOrDefault(m =>
                m.Name == "Parse" &&
                m.GetParameters().Length == 1 &&
                m.GetParameters()[0].ParameterType == typeof(string));

            var value = parse != null ?
                parse.Invoke(thisProperty, new object[] { properties[thisProperty.Name].StringValue }) :
                Convert.ChangeType(properties[thisProperty.Name].PropertyAsObject, thisProperty.PropertyType);

            thisProperty.SetValue(this, value);
        }
    }

    /// <inheritdoc/>
    public override IDictionary<string, EntityProperty> WriteEntity(OperationContext operationContext)
    {
        var properties = base.WriteEntity(operationContext);

        foreach (var thisProperty in
            GetType().GetProperties().Where(thisProperty =>
                !properties.ContainsKey(thisProperty.Name) &&
                typeof(TableEntity).GetProperties().All(p => p.Name != thisProperty.Name)))
        {
            var value = thisProperty.GetValue(this);
            if (value != null)
            {
                properties.Add(thisProperty.Name, new EntityProperty(value.ToString()));
            }
        }

        return properties;
    }
}