LinqDataSourceHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / webcontrols / LinqDataSourceHelper.cs / 1 / LinqDataSourceHelper.cs
                        

                        
                            namespace System.Web.UI.WebControls { 
    using System.Collections;
    using System.Collections.Generic;

    internal class LinqDataSourceHelper { 

        public static bool EnumerableContentEquals(IEnumerable enumerableA, IEnumerable enumerableB) { 
            IEnumerator enumeratorA = enumerableA.GetEnumerator(); 
            IEnumerator enumeratorB = enumerableB.GetEnumerator();
            while (enumeratorA.MoveNext()) { 
                if (!enumeratorB.MoveNext())
                    return false;
                object itemA = enumeratorA.Current;
                object itemB = enumeratorB.Current; 
                if (itemA == null) {
                    if (itemB != null) 
                        return false; 
                }
                else if (!itemA.Equals(itemB)) 
                    return false;
            }
            if (enumeratorB.MoveNext())
                return false; 
            return true;
        } 
 
        public static Type FindGenericEnumerableType(Type type) {
            // Logic taken from Queryable.AsQueryable which accounts for Array types which are not 
            // generic but implement the generic IEnumerable interface.
            while ((type != null) && (type != typeof(object)) && (type != typeof(string))) {
                if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(IEnumerable<>))) {
                    return type; 
                }
                foreach (Type interfaceType in type.GetInterfaces()) { 
                    Type genericInterface = FindGenericEnumerableType(interfaceType); 
                    if (genericInterface != null) {
                        return genericInterface; 
                    }
                }
                type = type.BaseType;
            } 
            return null;
        } 
 
    }
 
}

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

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