UriKind is not recognized in Uri constructor

[zspitz]

System.Uri is a predefined type.

The following:

class Person { }

var selector = "Uri(\"https://www.example.com/\", UriKind.Absolute)";
var prm = Parameter(typeof(Person));
var parser = new ExpressionParser(new[] { prm }, selector, new object[] { }, ParsingConfig.Default);
var expr = parser.Parse(null);

fails with:

System.Linq.Dynamic.Core.Exceptions.ParseException: 'No property or field 'UriKind' exists in type 'Person''

UriKind appears to be understood as a member of Person, and not as an enum value.

This is especially puzzling, because the following selector:

var selector = "DateTime(633979008000000000, DateTimeKind.Local)";

is parsed just fine.

Could it be because there is a string literal within the first selector?

[StefH]

Hello @zspitz.

A small remark: you always use the ExpressionParser in your examples.

However this class does not exists in this repository, it should be DynamicExpressionParser.
https://github.com/zzzprojects/System.Linq.Dynamic.Core/blob/master/src/System.Linq.Dynamic.Core/DynamicExpressionParser.cs

I think you are mistaken by another source code repository?

[zspitz]

@StefH I don't think so; it's right here: https://github.com/zzzprojects/System.Linq.Dynamic.Core/blob/master/src/System.Linq.Dynamic.Core/Parser/ExpressionParser.cs .

And AFAICT, DynamicExpressionParser uses ExpressionParser:

• https://github.com/zzzprojects/System.Linq.Dynamic.Core/blob/master/src/System.Linq.Dynamic.Core/DynamicExpressionParser.cs#L28
• https://github.com/zzzprojects/System.Linq.Dynamic.Core/blob/master/src/System.Linq.Dynamic.Core/DynamicExpressionParser.cs#L48
• https://github.com/zzzprojects/System.Linq.Dynamic.Core/blob/master/src/System.Linq.Dynamic.Core/DynamicExpressionParser.cs#L120

I've just checked now -- every method in DynamicExpressionParser calls either ParseLambda, which then calls ExpressionParser; or calls ExpressionParser directly.

[StefH]

You are correct.

However I think the DynamicExpressionParser is a more public class, and the ExpressionParser is more internal. That's why I was confused.

[StefH]

Hello @zspitz,

As a workaround you can use the integer value from the enum:
Uri(\"https://www.example.com/\", 0)

or

Use parameter:

var selector = "Uri(\"https://www.example.com/\", @0)";
var prm = Expression.Parameter(typeof(Uri));
var parser = new ExpressionParser(new[] { prm }, selector, new object[] { UriKind.Absolute }, ParsingConfig.Default);
var expr = parser.Parse(null);

I'll investigate further on the details on this issue.

[StefH]

Solved by #450