/// <summary>
/// Use this method instead of Convert.ChangeType. Makes Convert.ChangeType work with Nullable types.
/// </summary>
/// <param name="value"></param>
/// <param name="type"></param>
/// <param name="provider"></param>
/// <returns></returns>
public static object ChangeType(object value, Type type, IFormatProvider provider)
{
var underlyingType = Nullable.GetUnderlyingType(type);
if (!(underlyingType != null))
{
return(TypeConverterHelper.ChangeType(value, type, provider));
}
if (value is string && underlyingType != typeof(string) && ValueConvert.IsEmpty((string)value))
{
return(null);
}
value = ChangeType(value, underlyingType, provider);
if (value is DBNull)
{
return(null);
}
return(value);
}
/// <summary>
/// Use this method instead of Convert.ChangeType. Makes Convert.ChangeType work with Nullable types.
/// </summary>
/// <param name="value"></param>
/// <param name="type"></param>
/// <returns></returns>
public static object ChangeType(object value, Type type)
{
var underlyingType = Nullable.GetUnderlyingType(type);
if (underlyingType != null)
{
if (value is string && underlyingType != typeof(string) && ValueConvert.IsEmpty((string)value))
{
return(null);
}
value = ChangeType(value, underlyingType);
if (value is DBNull)
{
return(null);
}
return(value);
}
if (!type.GetTypeInfo().IsInterface)
{
return(TypeConverterHelper.ChangeType(value, type));
}
return(value);
}
