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)); }
internal IQueryProvider FindProvider(Expression expression, object[] args) { Func <object, int, ConstantExpression> selector = null; Expression expression2 = this.FindProviderInExpression(expression) as ConstantExpression; if (((expression2 == null) && (args != null)) && (args.Length > 0)) { if (selector == null) { selector = (a, i) => Expression.Constant(a, this.query.Parameters[i].Type); } Expression expression3 = ExpressionReplacer.ReplaceAll(expression, this.query.Parameters.ToArray <ParameterExpression>(), args.Select <object, ConstantExpression>(selector).ToArray <ConstantExpression>()); expression2 = this.FindProviderInExpression(expression3); } if (expression2 != null) { ConstantExpression expression4 = expression2 as ConstantExpression; if (expression4 == null) { expression4 = PartialEvaluator.Eval(expression2) as ConstantExpression; } if (expression4 != null) { IQueryProvider provider = expression4.Value as IQueryProvider; if (provider == null) { IQueryable queryable = expression4.Value as IQueryable; if (queryable != null) { provider = queryable.Provider; } } return(provider); } } return(null); }