public override DynamicMetaObject BindInvokeMember(
InvokeMemberBinder binder, DynamicMetaObject[] args)
{
var expressionFunctionConstructor = typeof(ExpressionFunction).GetConstructor(new[] { typeof(string), typeof(IEnumerable<object>) });
if (FunctionMapping.ContainsFunction(binder.Name, args.Length))
{
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
Expression.Convert(Expression, LimitType),
Expression.New(expressionFunctionConstructor,
Expression.Constant(binder.Name),
Expression.NewArrayInit(typeof(object), args.Select(x => Expression.Convert(x.Expression, typeof(object))))));
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
if (string.Equals(binder.Name, ODataLiteral.Any, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.All, StringComparison.OrdinalIgnoreCase))
{
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
Expression.Convert(Expression, LimitType),
Expression.New(expressionFunctionConstructor,
Expression.Constant(binder.Name),
Expression.NewArrayInit(typeof(object), args.Select(x => Expression.Convert(x.Expression, typeof(object))))));
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
if (string.Equals(binder.Name, ODataLiteral.IsOf, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.Is, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.Cast, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.As, StringComparison.OrdinalIgnoreCase))
{
var functionName = string.Equals(binder.Name, ODataLiteral.Is, StringComparison.OrdinalIgnoreCase)
? ODataLiteral.IsOf
: string.Equals(binder.Name, ODataLiteral.As, StringComparison.OrdinalIgnoreCase)
? ODataLiteral.Cast
: binder.Name;
var isNullProperty = typeof(DynamicODataExpression).GetProperty(nameof(IsNull));
var expressionFunctionArguments = Expression.Condition(Expression.MakeMemberAccess(Expression.Convert(Expression, LimitType), isNullProperty),
Expression.Convert(Expression, typeof(object)),
Expression.Convert(args.First().Expression, typeof(object)));
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
Expression.Convert(Expression, LimitType),
Expression.New(expressionFunctionConstructor,
Expression.Constant(functionName),
Expression.NewArrayInit(typeof(object), expressionFunctionArguments)));
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
return base.BindInvokeMember(binder, args);
}
public override DynamicMetaObject BindGetMember(GetMemberBinder binder)
{
ConstructorInfo ctor;
Expression[] ctorArguments;
if (FunctionMapping.ContainsFunction(binder.Name, 0))
{
ctor = CtorWithExpressionAndString;
ctorArguments = new Expression[] { Expression.Convert(Expression, LimitType), Expression.Constant(binder.Name) };
}
else
{
Expression<Func<bool, ODataExpression, string>> calculateReference = (hv, e) => hv && !string.IsNullOrEmpty(e.Reference)
? string.Join("/", e.Reference, binder.Name)
: binder.Name;
var referenceExpression = Expression.Invoke(calculateReference, Expression.Constant(HasValue), Expression.Convert(Expression, LimitType));
ctor = CtorWithString;
ctorArguments = new Expression[] { referenceExpression };
}
return new DynamicMetaObject(
Expression.New(ctor, ctorArguments),
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}