public void GetQueryOperatorExpression_ArrayLength_NotRegistered()
{
var expressionTreeParser = new ExpressionTreeParser(new MethodInfoBasedNodeTypeRegistry(), new NullExpressionTreeProcessor());
var memberExpression = (UnaryExpression)ExpressionHelper.MakeExpression(() => new int[0].Length);
var queryOperatorExpression = expressionTreeParser.GetQueryOperatorExpression(memberExpression);
Assert.That(queryOperatorExpression, Is.Null);
}
public void GetQueryOperatorExpression_MemberExpression_NotRegistered()
{
var expressionTreeParser = new ExpressionTreeParser(new MethodInfoBasedNodeTypeRegistry(), new NullExpressionTreeProcessor());
var memberExpression = (MemberExpression)ExpressionHelper.MakeExpression(() => new List <int> ().Count);
var queryOperatorExpression = expressionTreeParser.GetQueryOperatorExpression(memberExpression);
Assert.That(queryOperatorExpression, Is.Null);
}
public void GetQueryOperatorExpression_MethodCallExpression()
{
var methodCallExpression = (MethodCallExpression)ExpressionHelper.MakeExpression(() => ((IEnumerable <int>)_intSource).Select(i => i));
var queryOperatorExpression = _expressionTreeParser.GetQueryOperatorExpression(methodCallExpression);
Assert.That(queryOperatorExpression, Is.SameAs(methodCallExpression));
}
public override Expression Visit(Expression expression)
{
var potentialQueryOperatorExpression = _expressionTreeParser.GetQueryOperatorExpression(expression);
if (potentialQueryOperatorExpression != null &&
_nodeTypeProvider.IsRegistered(potentialQueryOperatorExpression.Method))
{
return(CreateSubQueryNode(potentialQueryOperatorExpression));
}
return(base.Visit(expression));
}