93 lines
3.3 KiB
C#
93 lines
3.3 KiB
C#
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using System;
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using System.Collections.Generic;
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namespace DynamicDescriptors;
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/// <summary>
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/// An implementation of <see cref="IComparer{T}"/> for <see cref="DynamicPropertyDescriptorComparer"/> instances.
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/// </summary>
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internal sealed class DynamicPropertyDescriptorComparer : IComparer<DynamicPropertyDescriptor>
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{
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/// <summary>
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/// The <see cref="StringComparer"/> to use to compare property names when unable to use property order.
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/// </summary>
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private static readonly StringComparer sc = StringComparer.OrdinalIgnoreCase;
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/// <summary>
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/// Compares two <see cref="DynamicPropertyDescriptor"/> instances and returns a value indicating
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/// whether one is less than, equal to, or greater than the other.
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/// </summary>
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/// <param name="x">The first <see cref="DynamicPropertyDescriptor"/> instance to compare.</param>
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/// <param name="y">The second <see cref="DynamicPropertyDescriptor"/> instance to compare.</param>
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/// <returns>
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/// A value that is less than zero if x is less than y, zero if x equals y,
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/// or greater than zero if x is greater than y.
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/// </returns>
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public int Compare(DynamicPropertyDescriptor x, DynamicPropertyDescriptor y)
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{
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if (x == null)
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{
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if (y == null)
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{
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// two nulls shall be considered equal.
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return 0;
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}
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else
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{
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// y comes first by virtue of it not being null.
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return 1;
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}
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}
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else
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{
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if (y == null)
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{
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// x comes first by virtue of it not being null.
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return -1;
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}
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else
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{
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if (x.PropertyOrder.HasValue)
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{
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if (y.PropertyOrder.HasValue)
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{
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if (x.PropertyOrder.Value > y.PropertyOrder.Value)
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{
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// y comes first by virtue of it having a lower property order.
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return 1;
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}
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else if (y.PropertyOrder.Value > x.PropertyOrder.Value)
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{
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// x comes first by virtue of it having a lower property order.
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return -1;
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}
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else
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{
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// property orders are the same, so use alphabetical order.
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return sc.Compare(x.Name, y.Name);
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}
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}
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else
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{
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// x comes first by virtue of it having a property order.
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return -1;
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}
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}
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else
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{
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if (y.PropertyOrder.HasValue)
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{
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// y comes first by virtue of it having a property order.
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return 1;
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}
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else
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{
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// neither have a property order, so use alphabetical order.
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return sc.Compare(x.Name, y.Name);
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}
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}
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}
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}
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}
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}
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