51 lines
1.6 KiB
C#
51 lines
1.6 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Reflection;
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namespace DTS.Common.Utilities
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{
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public class PropertyComparer<T> : IComparer<T>
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{
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private readonly IComparer _comparer;
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private PropertyDescriptor _propertyDescriptor;
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private int _reverse;
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public PropertyComparer(PropertyDescriptor property, ListSortDirection direction)
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{
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_propertyDescriptor = property;
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var comparerForPropertyType = typeof(Comparer<>).MakeGenericType(property.PropertyType);
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_comparer =
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(IComparer)
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comparerForPropertyType.InvokeMember("Default",
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BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.Public, null, null, null);
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SetListSortDirection(direction);
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}
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#region IComparer<T> Members
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public int Compare(T x, T y)
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{
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return _reverse * _comparer.Compare(_propertyDescriptor.GetValue(x), _propertyDescriptor.GetValue(y));
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}
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#endregion
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private void SetPropertyDescriptor(PropertyDescriptor descriptor)
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{
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_propertyDescriptor = descriptor;
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}
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private void SetListSortDirection(ListSortDirection direction)
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{
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_reverse = direction == ListSortDirection.Ascending ? 1 : -1;
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}
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public void SetPropertyAndDirection(PropertyDescriptor descriptor, ListSortDirection direction)
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{
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SetPropertyDescriptor(descriptor);
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SetListSortDirection(direction);
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}
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}
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}
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