Using Sum method without arguments throws exception

[victorr99]

1. Description

When chaining LINQ methods we encounter an exception. We've tried the examples below, but both generate an exception:

"Foo.SubFoos.SelectMany(s => s.DoubleArray).Sum()"
// or
"Foo.SubFoos.Sum(s => s.DoubleArray.Sum())"

2. Exception

Unhandled exception. System.InvalidOperationException: No generic method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic. 
   at System.Linq.Expressions.Expression.FindMethod(Type type, String methodName, Type[] typeArgs, Expression[] args, BindingFlags flags)
   at System.Linq.Expressions.Expression.Call(Type type, String methodName, Type[] typeArguments, Expression[] arguments)
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.TryParseEnumerable(Expression instance, Type elementType, String methodName, Int32 errorPos, Type type, Expression[]& args, Expression& expression) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 2182
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseMemberAccess(Type type, Expression expression, String id) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1815
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParsePrimary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 814
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseUnary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 801
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArithmetic() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 746
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAdditive() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 713
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseShiftOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 689
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseComparisonOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 479
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLogicalAndOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 411
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseIn() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 330
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAndOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 313
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 295
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLambdaOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 273
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseNullCoalescingOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 260
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseConditionalOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 244
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAsLambda(String id) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1992
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseMemberAccess(Type type, Expression expression, String id) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1800
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseIdentifier() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1060
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParsePrimaryStart() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 838
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParsePrimary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 806
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseUnary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 801
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArithmetic() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 746
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAdditive() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 713
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseShiftOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 689
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseComparisonOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 479
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLogicalAndOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 411
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseIn() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 330
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAndOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 313
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 295
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLambdaOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 273
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseNullCoalescingOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 260
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseConditionalOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 244
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseOutKeyword() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 196
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArguments() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 2259
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArgumentList() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 2245
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.TryParseEnumerable(Expression instance, Type elementType, String methodName, Int32 errorPos, Type type, Expression[]& args, Expression& expression) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 2078
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseMemberAccess(Type type, Expression expression, String id) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1815
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParsePrimary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 814
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseUnary() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 801
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArithmetic() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 746
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAdditive() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 713
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseShiftOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 689
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseComparisonOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 479
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLogicalAndOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 411
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseIn() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 330
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAndOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 313
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseOrOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 295
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLambdaOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 273
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseNullCoalescingOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 260
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseConditionalOperator() in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 244
   at System.Linq.Dynamic.Core.Parser.ExpressionParser.Parse(Type resultType, Boolean createParameterCtor) in C:\dev\GitHub\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 159
   at Program.Main()

3. Fiddle or Project

https://dotnetfiddle.net/DeXvio

var childType = DynamicClassFactory.CreateType(
[
	new DynamicProperty("DoubleArray", typeof(double[]))
]);

var parentType = DynamicClassFactory.CreateType(
[
	new DynamicProperty("SubFoos", childType.MakeArrayType())
]);

var parser = new ExpressionParser(
	[
		Expression.Parameter(parentType, "Foo")
	],
	"Foo.SubFoos.Sum(s => s.DoubleArray.Sum())",
	// This one generates the same error
	// "Foo.SubFoos.SelectMany(s => s.DoubleArray).Sum()",
	[],
	new ParsingConfig());

parser.Parse(typeof(double));

[victorr99]

Any update on this issue?

[StefH]

#861