48 lines
1.8 KiB
C#
48 lines
1.8 KiB
C#
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namespace System.Web.UI.WebControls {
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using System.Collections;
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using System.Collections.Generic;
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internal class LinqDataSourceHelper {
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public static bool EnumerableContentEquals(IEnumerable enumerableA, IEnumerable enumerableB) {
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IEnumerator enumeratorA = enumerableA.GetEnumerator();
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IEnumerator enumeratorB = enumerableB.GetEnumerator();
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while (enumeratorA.MoveNext()) {
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if (!enumeratorB.MoveNext())
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return false;
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object itemA = enumeratorA.Current;
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object itemB = enumeratorB.Current;
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if (itemA == null) {
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if (itemB != null)
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return false;
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}
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else if (!itemA.Equals(itemB))
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return false;
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}
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if (enumeratorB.MoveNext())
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return false;
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return true;
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}
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public static Type FindGenericEnumerableType(Type type) {
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// Logic taken from Queryable.AsQueryable which accounts for Array types which are not
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// generic but implement the generic IEnumerable interface.
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while ((type != null) && (type != typeof(object)) && (type != typeof(string))) {
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if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(IEnumerable<>))) {
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return type;
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}
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foreach (Type interfaceType in type.GetInterfaces()) {
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Type genericInterface = FindGenericEnumerableType(interfaceType);
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if (genericInterface != null) {
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return genericInterface;
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}
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}
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type = type.BaseType;
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}
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return null;
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}
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}
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}
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