private LambdaExpression Parameterize(Expression query, out object[] arguments)
{
IQueryProvider provider = this.FindProvider(query);
if (provider == null)
{
throw new ArgumentException("Cannot deduce query provider from query");
}
IEntityProvider ep = provider as IEntityProvider;
Func <Expression, bool> fnCanBeEvaluated = (ep != null) ? new Func <Expression, bool>(ep.CanBeEvaluatedLocally) : null;
List <ParameterExpression> parameters = new List <ParameterExpression>();
List <object> values = new List <object>();
Expression expression = PartialEvaluator.Eval(query, fnCanBeEvaluated, delegate(ConstantExpression c) {
bool flag = c.Value is IQueryable;
if (!((flag || (ep == null)) || ep.CanBeParameter(c)))
{
return(c);
}
ParameterExpression item = Expression.Parameter(c.Type, "p" + parameters.Count);
parameters.Add(item);
values.Add(c.Value);
if (flag)
{
return(c);
}
return(item);
});
if (expression.Type != typeof(object))
{
expression = Expression.Convert(expression, typeof(object));
}
arguments = values.ToArray();
if (arguments.Length < 5)
{
return(Expression.Lambda(expression, parameters.ToArray()));
}
arguments = new object[] { arguments };
return(ExplicitToObjectArray.Rewrite(expression, parameters));
}
