1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
| using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
namespace TestPG_Enum
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
//Je crée mon object qui va gérer mes entrées dans le PropertyGrid
PGElements ValeurSelect = new PGElements();
//J'associe l'objet au propertyGrid pGtest
pGtest.SelectedObject = ValeurSelect;
}
}
/// <summary>
/// La classe de l'objet que l'on veut voir dans le propertyGrid
/// </summary>
public class PGElements
{
private String selectedvalue = "Second";
[TypeConverter(typeof(MainListConverter))] //On travaille avec le type de base String, mais il est lié au Converter MainListConverter
public String TestString
{
get
{
return this.selectedvalue;
}
set
{
if (value.GetType() == typeof(String))
this.selectedvalue = value;
}
}
}
/// <summary>
/// Définition du Converter qui va gérer la correspondance entre un simple String et ma liste de valeur
/// </summary>
public class MainListConverter : System.ComponentModel.TypeConverter
{
public List<String> MainList;
private MainListConverter()
{
//Je rempli arbirtrairement ma liste de valeur (peut etre fait dynamiquement)
MainList = new List<string>();
MainList.Add("First");
MainList.Add("Second");
MainList.Add("Third");
MainList.Add("Fourth");
}
#region fonction du Converter
// Indicates this converter provides a list of standard values.
public override bool GetStandardValuesSupported(System.ComponentModel.ITypeDescriptorContext context)
{
return true;
}
// Returns a StandardValuesCollection of standard value objects.
public override System.ComponentModel.TypeConverter.StandardValuesCollection GetStandardValues(System.ComponentModel.ITypeDescriptorContext context)
{
// Passes the local integer array.
StandardValuesCollection svc =
new StandardValuesCollection(MainList);
return svc;
}
// Returns true for a sourceType of string to indicate that
// conversions from string to integer are supported. (The
// GetStandardValues method requires a string to native type
// conversion because the items in the drop-down list are
// translated to string.)
public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType)
{
if (sourceType == typeof(string))
return true;
else
return base.CanConvertFrom(context, sourceType);
}
// If the type of the value to convert is string, parses the string
// and returns the integer to set the value of the property to.
// This example first extends the integer array that supplies the
// standard values collection if the user-entered value is not
// already in the array.
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (value.GetType() == typeof(string))
{
// Parses the string to get the integer to set to the property.
String newVal = (String)value;
// Tests whether new String is already in the list.
if (!MainList.Contains(newVal))
{
// If the String is not in list, adds it in order.
MainList.Add(newVal);
MainList.Sort();
}
// Returns the String value to assign to the property.
return newVal;
}
else
return base.ConvertFrom(context, culture, value);
}
#endregion
}
} |
