/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert the value to.</param>
/// <returns>The converted type.</returns>
public static object Convert(object initialValue, CultureInfo culture, Type targetType)
{
if (initialValue == null)
{
throw new ArgumentNullException("initialValue");
}
if (ReflectionUtils.IsNullableType(targetType))
{
targetType = Nullable.GetUnderlyingType(targetType);
}
Type initialType = initialValue.GetType();
if (targetType == initialType)
{
return(initialValue);
}
// use Convert.ChangeType if both types are IConvertible
if (ConvertUtils.IsConvertible(initialValue.GetType()) && ConvertUtils.IsConvertible(targetType))
{
if (targetType.IsEnum())
{
if (initialValue is string)
{
return(Enum.Parse(targetType, initialValue.ToString(), true));
}
else if (IsInteger(initialValue))
{
return(Enum.ToObject(targetType, initialValue));
}
}
return(System.Convert.ChangeType(initialValue, targetType, culture));
}
#if !NET20
if (initialValue is DateTime && targetType == typeof(DateTimeOffset))
{
return(new DateTimeOffset((DateTime)initialValue));
}
#endif
if (initialValue is byte[] && targetType == typeof(Guid))
{
return(new Guid((byte[])initialValue));
}
if (initialValue is string)
{
if (targetType == typeof(Guid))
{
return(new Guid((string)initialValue));
}
if (targetType == typeof(Uri))
{
return(new Uri((string)initialValue, UriKind.RelativeOrAbsolute));
}
if (targetType == typeof(TimeSpan))
{
return(ParseTimeSpan((string)initialValue));
}
if (typeof(Type).IsAssignableFrom(targetType))
{
return(Type.GetType((string)initialValue, true));
}
}
#if !(NET20 || NET35 || SILVERLIGHT || PORTABLE40 || PORTABLE)
if (targetType == typeof(BigInteger))
{
return(ToBigInteger(initialValue));
}
if (initialValue is BigInteger)
{
return(FromBigInteger((BigInteger)initialValue, targetType));
}
#endif
#if !(NETFX_CORE || PORTABLE40 || PORTABLE)
// see if source or target types have a TypeConverter that converts between the two
TypeConverter toConverter = GetConverter(initialType);
if (toConverter != null && toConverter.CanConvertTo(targetType))
{
#if !SILVERLIGHT
return(toConverter.ConvertTo(null, culture, initialValue, targetType));
#else
return(toConverter.ConvertTo(initialValue, targetType));
#endif
}
TypeConverter fromConverter = GetConverter(targetType);
if (fromConverter != null && fromConverter.CanConvertFrom(initialType))
{
#if !SILVERLIGHT
return(fromConverter.ConvertFrom(null, culture, initialValue));
#else
return(fromConverter.ConvertFrom(initialValue));
#endif
}
#endif
#if !(NETFX_CORE || PORTABLE40 || PORTABLE)
// handle DBNull and INullable
if (initialValue == DBNull.Value)
{
if (ReflectionUtils.IsNullable(targetType))
{
return(EnsureTypeAssignable(null, initialType, targetType));
}
throw new Exception("Can not convert null {0} into non-nullable {1}.".FormatWith(CultureInfo.InvariantCulture, initialType, targetType));
}
#endif
#if !(SILVERLIGHT || NETFX_CORE || PORTABLE40 || PORTABLE)
if (initialValue is INullable)
{
return(EnsureTypeAssignable(ToValue((INullable)initialValue), initialType, targetType));
}
#endif
if (targetType.IsInterface() || targetType.IsGenericTypeDefinition() || targetType.IsAbstract())
{
throw new ArgumentException("Target type {0} is not a value type or a non-abstract class.".FormatWith(CultureInfo.InvariantCulture, targetType), "targetType");
}
throw new InvalidOperationException("Can not convert from {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, initialType, targetType));
}
