SubqueryRules.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SubqueryRules.cs / 1305376 / SubqueryRules.cs
                        

                        
                            using System; 
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Linq.Expressions; 

namespace System.Data.Linq { 
    ///  
    /// Encodes the rules for subqueries.
    ///  
    static class SubqueryRules {
        /// 
        /// This list of top-level methods that are supported in subqueries.
        ///  
        /// 
        ///  
        static internal bool IsSupportedTopLevelMethod(MethodInfo mi) { 
            if (!IsSequenceOperatorCall(mi))
                return false; 
            switch (mi.Name) {
                case "Where":
                case "OrderBy":
                case "OrderByDescending": 
                case "ThenBy":
                case "ThenByDescending": 
                case "Take": 
                    return true;
            } 
            return false;
        }
        private static bool IsSequenceOperatorCall(MethodInfo mi) {
            Type declType = mi.DeclaringType; 
            if (declType == typeof(System.Linq.Enumerable) ||
                declType == typeof(System.Linq.Queryable)) { 
                return true; 
            }
            return false; 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK