//public void Visit(TakeNode node)
//{
// var caller = this.ContextExpression.Pop();
// var types = new List<Type>() { caller.Type.IsGenericType ? caller.Type.GenericTypeArguments[0] : caller.Type };
// var exp = Expression.Call(typeof(Queryable), "Take", types.ToArray(), caller, Expression.Constant(node.Take));
// this.ContextExpression.Push(exp);
//}
//public void Visit(SkipNode node)
//{
// var caller = this.ContextExpression.Pop();
// var types = new List<Type>() { caller.Type.IsGenericType ? caller.Type.GenericTypeArguments[0] : caller.Type };
// var exp = Expression.Call(typeof(Queryable), "Skip", types.ToArray(), caller, Expression.Constant(node.Skip));
// this.ContextExpression.Push(exp);
//}
public void VisitConstant(QNode node)
{
Type valueType = null;
if (node.Value.GetType().IsGenericType)
{
valueType = node.Value.GetType().GetGenericArguments()[0];
}
else
{
valueType = node.Value.GetType();
}
var memberType = ContextExpression.Peek().Type;
if (valueType != memberType)
{
if (node.Value.GetType().IsGenericType)
{
var list = (List <string>)node.Value;
if (memberType == typeof(long))
{
var exp = Expression.Constant(list.ConvertAll(Convert.ToInt64));
ContextExpression.Push(exp);
}
else if (memberType == typeof(DateTime))
{
var exp = Expression.Constant(list.ConvertAll(Convert.ToDateTime));
ContextExpression.Push(exp);
}
else
{
//var listType = typeof(List<>);
//var concreteType = listType.MakeGenericType(memberType);
//var valueList = Activator.CreateInstance(concreteType);
//var methodInfo = valueList.GetType().GetMethod("Add");
//foreach (var stringValue in (List<string>)node.Value)
//{
// var value = ConvertConstant(stringValue, propertyMap.DestinationPropertyType, out operatorType);
// methodInfo.Invoke(valueList, new object[] { value });
//}
throw new Exception(string.Format("VisitConstantNode :Type {0}", memberType));
}
}
else
{
var value = Convert.ChangeType(node.Value, memberType);
var exp1 = Expression.Constant(value);
ContextExpression.Push(exp1);
}
}
else
{
var exp = Expression.Constant(node.Value, ContextExpression.Peek().Type);
ContextExpression.Push(exp);
}
}
public void VisitProjection(QNode node)
{
var left = ContextExpression.Pop();
Type projectorType = null;
var dynamicProperties = new List <DynamicProperty>();
var bindings1 = MemberNodeConverter.ConvertToBindings(ContextParameters.Peek(), node);
foreach (var binding in bindings1)
{
var property = new DynamicProperty(binding.Key, binding.Value.Type);
dynamicProperties.Add(property);
}
projectorType = ClassFactory.Instance.GetDynamicClass(dynamicProperties);
var resultProperties = projectorType.GetProperties();
var bindingsSource = new List <Expression>();
var bindingsProperties = new List <PropertyInfo>();
foreach (var binding in bindings1)
{
bindingsProperties.Add(resultProperties.FirstOrDefault(x => x.Name == binding.Key));
bindingsSource.Add(binding.Value);
}
var bindings = new List <MemberBinding>();
for (var i = 0; i < bindingsSource.Count; i++)
{
var exp = Expression.Bind(bindingsProperties[i], bindingsSource[i]);
bindings.Add(exp);
}
var lambda =
Expression.Lambda(
Expression.MemberInit(Expression.New(projectorType.GetConstructor(Type.EmptyTypes)), bindings),
ContextParameters.Peek());
var result = BuildMethodCallExpression(MethodType.Select, left, lambda);
ContextExpression.Push(result);
HasProjection = true;
Mapper.EnableMapping = false;
}
public void VisitBinary(QNode node)
{
var right = ContextExpression.Pop();
var left = ContextExpression.Pop();
BinaryType op;
if (node.Value is long)
{
op = (BinaryType)Convert.ToInt16(node.Value);
}
else
{
Enum.TryParse(Convert.ToString(node.Value), out op);
}
var exp = BuildBinaryExpression(op, left, right);
ContextExpression.Push(exp);
}
public void VisitMethod(QNode node)
{
MethodType method;
if (node.Value is long)
{
method = (MethodType)Convert.ToInt16(node.Value);
}
else
{
Enum.TryParse(Convert.ToString(node.Value), out method);
}
var right = ContextExpression.Pop();
var left = ContextExpression.Pop();
var lambda = Expression.Lambda(right, ContextParameters.Peek());
var exp = BuildMethodCallExpression(method, left, lambda);
ContextExpression.Push(exp);
}
public void VisitQuerable(QNode node)
{
ContextExpression.Push(Query);
Mapper.EnableMapping = true;
}
public void VisitMember(QNode node)
{
var member = MemberNodeConverter.ConvertToMemberExpression(ContextParameters.Peek(), node);
ContextExpression.Push(member);
}