QueryResults.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Linq / Parallel / QueryOperators / QueryResults.cs / 1305376 / QueryResults.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
// 
// QueryResults.cs 
//
// [....] 
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics.Contracts; 
 
namespace System.Linq.Parallel
{ 
    /// 
    /// The QueryResults{T} is a class representing the results of the query. There may
    /// be different ways the query results can be manipulated. Currently, two ways are
    /// supported: 
    ///
    /// 1. Open the query results as a partitioned stream by calling GivePartitionedStream 
    ///    and pass a generic action as an argument. 
    ///
    /// 2. Access individual elements of the results list by calling GetElement(index) and 
    ///    ElementsCount. This method of accessing the query results is available only if
    ///    IsIndexible return true.
    /// 
    ///  
    internal abstract class QueryResults : IList
    { 
        //------------------------------------------------------------------------------------ 
        // Gets the query results represented as a partitioned stream. Instead of returning
        // the PartitionedStream, we instead call recipient.Receive(...). That way, 
        // the code that receives the partitioned stream has access to the TKey type.
        //
        // Arguments:
        //    recipient - the object that the partitioned stream will be passed to 
        //
 
        internal abstract void GivePartitionedStream(IPartitionedStreamRecipient recipient); 

        //----------------------------------------------------------------------------------- 
        // Returns whether the query results are indexible. If this property is true, the
        // user can call GetElement(index) and ElementsCount. If it is false, both
        // GetElement(index) and ElementsCount should throw InvalidOperationException.
        // 

        internal virtual bool IsIndexible 
        { 
            get { return false; }
        } 

        //-----------------------------------------------------------------------------------
        // Returns index-th element in the query results
        // 
        // Assumptions:
        //    IsIndexible returns true 
        //    0 <= index < ElementsCount 
        //
 
        internal virtual T GetElement(int index)
        {
            Contract.Assert(false, "GetElement property is not supported by non-indexible query results");
            throw new NotSupportedException(); 
        }
 
        //----------------------------------------------------------------------------------- 
        // Returns the number of elements in the query results
        // 
        // Assumptions:
        //    IsIndexible returns true
        //
 
        internal virtual int ElementsCount
        { 
            get 
            {
                Contract.Assert(false, "ElementsCount property is not supported by non-indexible query results"); 
                throw new NotSupportedException();
            }
        }
 
        //
        // An assortment of methods we need to support in order to implement the IList interface 
        // 

        int IList.IndexOf(T item) 
        {
            throw new NotSupportedException();
        }
 
        void IList.Insert(int index, T item)
        { 
            throw new NotSupportedException(); 
        }
 
        void IList.RemoveAt(int index)
        {
            throw new NotSupportedException();
        } 

        public T this[int index] 
        { 
            get { return GetElement(index); }
            set 
            {
                throw new NotSupportedException();
            }
        } 

        void ICollection.Add(T item) 
        { 
            throw new NotSupportedException();
        } 

        void ICollection.Clear()
        {
            throw new NotSupportedException(); 
        }
 
        bool ICollection.Contains(T item) 
        {
            throw new NotSupportedException(); 
        }

        void ICollection.CopyTo(T[] array, int arrayIndex)
        { 
            throw new NotSupportedException();
        } 
 
        public int Count
        { 
            get { return ElementsCount; }
        }

        bool ICollection.IsReadOnly 
        {
            get { return true; } 
        } 

        bool ICollection.Remove(T item) 
        {
            throw new NotSupportedException();
        }
 
        IEnumerator IEnumerable.GetEnumerator()
        { 
            for (int index = 0; index < Count; index++) 
            {
                yield return this[index]; 
            }
        }

        IEnumerator IEnumerable.GetEnumerator() 
        {
            return ((IEnumerable)this).GetEnumerator(); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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QueryResults.cs source code in C# .NET

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