private static Expression ChangeTypeHelper(Expression input, Type type)
{
if (type == typeof(string))
{
return(input);
}
MethodInfo parse;
if ((parse = type.GetMethod("Parse", new[] { typeof(string) }))?.ReturnType == type)
{
return(Expression.Call(parse, input));
}
Expression convert;
if (type.IsEnum)
{
var parser = EnumParseHelper.GetParser(type);
convert = Expression.Invoke(parser, input);
}
else
{
parse = typeof(Convert).GetMethod(nameof(Convert.ChangeType), new[] { typeof(object), typeof(Type) });
convert = Expression.Call(parse, input, Expression.Constant(type));
}
return(Expression.Convert(convert, type));
}
public static ObjectParserConfiguration CreateDefault()
{
return(CreateEmpty()
.Configure <string>(ValueParser.CreateSimpleStringParser())
.Configure <int>(int.TryParse)
.Configure <byte>(byte.TryParse)
.Configure <sbyte>(sbyte.TryParse)
.Configure <long>(long.TryParse)
.Configure <short>(short.TryParse)
.Configure((string value, out decimal result) => decimal.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out result))
.Configure((string value, out double result) => double.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out result))
.Configure((string value, out float result) => float.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out result))
.Configure <bool>(bool.TryParse)
.Configure <Guid>(Guid.TryParse)
.Configure <TimeUuid>(TimeUuidParseHelper.TryParse)
.Configure <DateTime>(DateTimeParseHelper.TryParse)
.Configure <DateTimeOffset>(DateTimeParseHelper.TryParse)
.Configure <LocalDate>(DateTimeParseHelper.TryParse)
.Configure <LocalTime>(DateTimeParseHelper.TryParse)
.ConfigureEnumParse(new EnumParser((Type enumType, string value, out object result) => EnumParseHelper.TryParse(enumType, value, out result))));
}
