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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace BLToolkit.Reflection.Extension
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5 {
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6 public class AttributeExtensionCollection : List<AttributeExtension>
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7 {
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8 public new AttributeExtension this[int index]
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9 {
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10 get
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11 {
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12 return this == _null || index < 0 || index >= Count ? AttributeExtension.Null : base[index];
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13 }
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14 }
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15
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16 public object Value
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17 {
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18 get { return this == _null? null: this[0].Value; }
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19 }
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20
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21 public new void Add(AttributeExtension attributeExtension)
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22 {
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23 if (this != _null)
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24 base.Add(attributeExtension);
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25 }
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26
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27 private static readonly AttributeExtensionCollection _null = new AttributeExtensionCollection();
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28 public static AttributeExtensionCollection Null
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29 {
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30 get { return _null; }
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31 }
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32 }
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33 }
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