public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (!(value is string))
{
throw new Exception("Can't convert " + value.GetType().FullName + " to UserDefindedType.");
}
return(UserDefinedType.FromString((string)value));
}
public static UserDefinedType FromString(string s)
{
string[] arr = s.Split('|');
if (arr.Length != 2)
{
throw new Exception("UserDefinedType.FromString: Wrong input string");
}
UserDefinedType result = new UserDefinedType();
result.a = int.Parse(arr[0]);
// Always use InvariantCulture, since otherwise your application may break
// if it is used in another country.
result.b = double.Parse(arr[1], CultureInfo.InvariantCulture);
return(result);
}
static void GenerateData()
{
PersistenceManager pm = new PersistenceManager();
pm.BuildDatabase();
// All primitive types and the storable value types in .NET
// support the IConvertible interface. You can just store them.
GenericProperty <string> gp1 = new GenericProperty <string>("String");
gp1.Value = "StringVal";
pm.MakePersistent(gp1);
GenericProperty <decimal> gp2 = new GenericProperty <decimal>("Decimal");
gp2.Value = 1.23m;
pm.MakePersistent(gp2);
GenericProperty <DateTime> gp3 = new GenericProperty <DateTime>("DateTime");
gp3.Value = DateTime.Now;
pm.MakePersistent(gp3);
GenericProperty <int> gp4 = new GenericProperty <int>("Integer");
gp4.Value = 234;
pm.MakePersistent(gp4);
// Any type having a type converter, which can convert to/from string
// can be stored using this technology.
GenericProperty <UserDefinedType> gp5 = new GenericProperty <UserDefinedType>("User Defined Type");
UserDefinedType udt = new UserDefinedType();
udt.A = 234;
udt.B = 33.3;
gp5.Value = udt;
pm.MakePersistent(gp5);
pm.Save();
}
