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Feature: Added support for implicit type conversions #166

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May 26, 2018
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21 changes: 20 additions & 1 deletion src/System.Linq.Dynamic.Core/Parser/ExpressionParser.cs
Original file line number Diff line number Diff line change
Expand Up @@ -499,9 +499,21 @@ Expression ParseComparisonOperator()
}
}


if (!typesAreSameAndImplementCorrectInterface)
{
CheckAndPromoteOperands(isEquality ? typeof(IEqualitySignatures) : typeof(IRelationalSignatures), op.Text, ref left, ref right, op.Pos);
if (left.Type.GetTypeInfo().IsClass && right is ConstantExpression && HasImplicitConversion(left.Type, right.Type))
{
left = Expression.Convert(left, right.Type);
}
else if (right.Type.GetTypeInfo().IsClass && left is ConstantExpression && HasImplicitConversion(right.Type, left.Type))
{
right = Expression.Convert(right, left.Type);
}
else
{
CheckAndPromoteOperands(isEquality ? typeof(IEqualitySignatures) : typeof(IRelationalSignatures), op.Text, ref left, ref right, op.Pos);
}
}
}

Expand Down Expand Up @@ -533,6 +545,13 @@ Expression ParseComparisonOperator()
return left;
}

private bool HasImplicitConversion(Type baseType, Type targetType)
{
return baseType.GetMethods(BindingFlags.Public | BindingFlags.Static)
.Where(mi => mi.Name == "op_Implicit" && mi.ReturnType == targetType)
.Any(mi => mi.GetParameters().FirstOrDefault()?.ParameterType == baseType);
}

private ConstantExpression ParseEnumToConstantExpression(int pos, Type leftType, ConstantExpression constantExpr)
{
return Expression.Constant(ParseConstantExpressionToEnum(pos, leftType, constantExpr), leftType);
Expand Down