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
|
//------------------------------------------------------------------------------
// <copyright file="unitconverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.Reflection;
using System.Web.Util;
public class UnitConverter : TypeConverter {
/// <internalonly/>
/// <devdoc>
/// Returns a value indicating whether the unit converter can
/// convert from the specified source type.
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string)) {
return true;
}
else {
return base.CanConvertFrom(context, sourceType);
}
}
/// <internalonly/>
/// <devdoc>
/// Returns a value indicating whether the converter can
/// convert to the specified destination type.
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if ((destinationType == typeof(string)) ||
(destinationType == typeof(InstanceDescriptor))) {
return true;
}
else {
return base.CanConvertTo(context, destinationType);
}
}
/// <internalonly/>
/// <devdoc>
/// Performs type conversion from the given value into a Unit.
/// </devdoc>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value == null)
return null;
string stringValue = value as string;
if (stringValue != null) {
string textValue = stringValue.Trim();
if (textValue.Length == 0) {
return Unit.Empty;
}
if (culture != null) {
return Unit.Parse(textValue, culture);
}
else {
return Unit.Parse(textValue, CultureInfo.CurrentCulture);
}
}
else {
return base.ConvertFrom(context, culture, value);
}
}
/// <internalonly/>
/// <devdoc>
/// Performs type conversion to the specified destination type
/// </devdoc>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == typeof(string)) {
if ((value == null) || ((Unit)value).IsEmpty)
return String.Empty;
else
return ((Unit)value).ToString(culture);
}
else if ((destinationType == typeof(InstanceDescriptor)) && (value != null)) {
Unit u = (Unit)value;
MemberInfo member = null;
object[] args = null;
if (u.IsEmpty) {
member = typeof(Unit).GetField("Empty");
}
else {
member = typeof(Unit).GetConstructor(new Type[] { typeof(double), typeof(UnitType) });
args = new object[] { u.Value, u.Type };
}
Debug.Assert(member != null, "Looks like we're missing Unit.Empty or Unit::ctor(double, UnitType)");
if (member != null) {
return new InstanceDescriptor(member, args);
}
else {
return null;
}
}
else {
return base.ConvertTo(context, culture, value, destinationType);
}
}
}
}
|
