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1 using System;
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2 using System.ComponentModel;
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3
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4 using BLToolkit.Reflection;
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5
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6 namespace BLToolkit.ComponentModel
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7 {
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8 public class MemberPropertyDescriptor : PropertyDescriptor
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9 {
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10 public MemberPropertyDescriptor(Type componentType, string memberName)
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11 : base(memberName, null)
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12 {
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13 _componentType = componentType;
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14 _memberAccessor = TypeAccessor.GetAccessor(componentType)[memberName];
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15 }
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16
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17 private readonly Type _componentType;
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18 public override Type ComponentType
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19 {
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20 get { return _componentType; }
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21 }
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22
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23 public override Type PropertyType
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24 {
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25 get { return _memberAccessor.Type; }
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26 }
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27
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28 private readonly MemberAccessor _memberAccessor;
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29 public MemberAccessor MemberAccessor
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30 {
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31 get { return _memberAccessor; }
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32 }
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33
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34 public override bool CanResetValue(object component)
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35 {
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36 if (PropertyType.IsValueType)
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37 return TypeAccessor.GetNullValue(PropertyType) != null;
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38 return PropertyType == typeof(string);
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39 }
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40
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41 public override void ResetValue(object component)
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42 {
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43 SetValue(component, TypeAccessor.GetNullValue(PropertyType));
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44 }
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45
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46 public override object GetValue(object component)
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47 {
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48 return component != null? _memberAccessor.GetValue(component): null;
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49 }
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50
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51 public override void SetValue(object component, object value)
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52 {
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53 if (component != null)
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54 _memberAccessor.SetValue(component, value);
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55 }
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56
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57 public override bool IsReadOnly
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58 {
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59 get { return !_memberAccessor.HasSetter; }
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60 }
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61
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62 public override bool ShouldSerializeValue(object component)
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63 {
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64 return false;
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65 }
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66
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67 private AttributeCollection _attributes;
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68 public override AttributeCollection Attributes
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69 {
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70 get
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71 {
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72 if (_attributes == null)
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73 {
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74 object[] memberAttrs = _memberAccessor.GetAttributes();
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75 Attribute[] attrs = new Attribute[memberAttrs == null? 0: memberAttrs.Length];
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76
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77 if (memberAttrs != null)
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78 memberAttrs.CopyTo(attrs, 0);
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79
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80 _attributes = new AttributeCollection(attrs);
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81 }
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82
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83 return _attributes;
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84 }
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85 }
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86 }
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87 }
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