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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
//-----------------------------------------------------------------------
// <copyright file="ConverterBase.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.ComponentModel {
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
/// <summary>
/// A design-time helper to allow Intellisense to aid typing
/// ClaimType URIs.
/// </summary>
/// <typeparam name="T">The strong-type of the property this class is affixed to.</typeparam>
public abstract class ConverterBase<T> : TypeConverter {
/// <summary>
/// A cache of the standard claim types known to the application.
/// </summary>
private StandardValuesCollection standardValues;
/// <summary>
/// Initializes a new instance of the ConverterBase class.
/// </summary>
protected ConverterBase() {
}
/// <summary>
/// Gets a cache of the standard values to suggest.
/// </summary>
private StandardValuesCollection StandardValueCache {
get {
if (this.standardValues == null) {
this.standardValues = new StandardValuesCollection(this.GetStandardValuesForCache());
}
return this.standardValues;
}
}
/// <summary>
/// Returns whether this object supports a standard set of values that can be picked from a list, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <returns>
/// true if <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> should be called to find a common set of values the object supports; otherwise, false.
/// </returns>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
return this.StandardValueCache.Count > 0;
}
/// <summary>
/// Returns a collection of standard values for the data type this type converter is designed for when provided with a format context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context that can be used to extract additional information about the environment from which this converter is invoked. This parameter or properties of this parameter can be null.</param>
/// <returns>
/// A <see cref="T:System.ComponentModel.TypeConverter.StandardValuesCollection"/> that holds a standard set of valid values, or null if the data type does not support a standard set of values.
/// </returns>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
return this.StandardValueCache;
}
/// <summary>
/// Returns whether the collection of standard values returned from <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> is an exclusive list of possible values, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <returns>
/// true if the <see cref="T:System.ComponentModel.TypeConverter.StandardValuesCollection"/> returned from <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> is an exhaustive list of possible values; false if other values are possible.
/// </returns>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
return false;
}
/// <summary>
/// Returns whether this converter can convert an object of the given type to the type of this converter, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <param name="sourceType">A <see cref="T:System.Type"/> that represents the type you want to convert from.</param>
/// <returns>
/// true if this converter can perform the conversion; otherwise, false.
/// </returns>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
return sourceType == typeof(string)
|| base.CanConvertFrom(context, sourceType);
}
/// <summary>
/// Returns whether this converter can convert the object to the specified type, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <param name="destinationType">A <see cref="T:System.Type"/> that represents the type you want to convert to.</param>
/// <returns>
/// true if this converter can perform the conversion; otherwise, false.
/// </returns>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
return destinationType == typeof(string)
|| destinationType == typeof(InstanceDescriptor)
|| base.CanConvertTo(context, destinationType);
}
/// <summary>
/// Converts the given object to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <param name="culture">The <see cref="T:System.Globalization.CultureInfo"/> to use as the current culture.</param>
/// <param name="value">The <see cref="T:System.Object"/> to convert.</param>
/// <returns>
/// An <see cref="T:System.Object"/> that represents the converted value.
/// </returns>
/// <exception cref="T:System.NotSupportedException">
/// The conversion cannot be performed.
/// </exception>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
string stringValue = value as string;
if (stringValue != null) {
return this.ConvertFrom(stringValue);
} else {
return base.ConvertFrom(context, culture, value);
}
}
/// <summary>
/// Converts the given value object to the specified type, using the specified context and culture information.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <param name="culture">A <see cref="T:System.Globalization.CultureInfo"/>. If null is passed, the current culture is assumed.</param>
/// <param name="value">The <see cref="T:System.Object"/> to convert.</param>
/// <param name="destinationType">The <see cref="T:System.Type"/> to convert the <paramref name="value"/> parameter to.</param>
/// <returns>
/// An <see cref="T:System.Object"/> that represents the converted value.
/// </returns>
/// <exception cref="T:System.ArgumentNullException">
/// The <paramref name="destinationType"/> parameter is null.
/// </exception>
/// <exception cref="T:System.NotSupportedException">
/// The conversion cannot be performed.
/// </exception>
[SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters", MessageId = "System.Diagnostics.Contracts.__ContractsRuntime.Assume(System.Boolean,System.String,System.String)", Justification = "No localization required.")]
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
Assumes.True(destinationType != null, "Missing contract.");
if (destinationType.IsInstanceOfType(value)) {
return value;
}
T typedValue = (T)value;
if (destinationType == typeof(string)) {
return this.ConvertToString(typedValue);
} else if (destinationType == typeof(InstanceDescriptor)) {
return this.CreateFrom(typedValue);
} else {
return base.ConvertTo(context, culture, value, destinationType);
}
}
/// <summary>
/// Creates an <see cref="InstanceDescriptor"/> instance, protecting against the LinkDemand.
/// </summary>
/// <param name="memberInfo">The member info.</param>
/// <param name="arguments">The arguments.</param>
/// <returns>A <see cref="InstanceDescriptor"/>, or <c>null</c> if sufficient permissions are unavailable.</returns>
protected static InstanceDescriptor CreateInstanceDescriptor(MemberInfo memberInfo, ICollection arguments) {
try {
return CreateInstanceDescriptorPrivate(memberInfo, arguments);
} catch (SecurityException) {
return null;
}
}
/// <summary>
/// Gets the standard values to suggest with Intellisense in the designer.
/// </summary>
/// <returns>A collection of the standard values.</returns>
[Pure]
[SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate", Justification = "Potentially expensive call.")]
protected virtual ICollection GetStandardValuesForCache() {
return new T[0];
}
/// <summary>
/// Converts a value from its string representation to its strongly-typed object.
/// </summary>
/// <param name="value">The value.</param>
/// <returns>The strongly-typed object.</returns>
[Pure]
protected abstract T ConvertFrom(string value);
/// <summary>
/// Creates the reflection instructions for recreating an instance later.
/// </summary>
/// <param name="value">The value to recreate later.</param>
/// <returns>The description of how to recreate an instance.</returns>
[Pure]
protected abstract InstanceDescriptor CreateFrom(T value);
/// <summary>
/// Converts the strongly-typed value to a string.
/// </summary>
/// <param name="value">The value to convert.</param>
/// <returns>The string representation of the object.</returns>
[Pure]
protected abstract string ConvertToString(T value);
/// <summary>
/// Creates an <see cref="InstanceDescriptor"/> instance, protecting against the LinkDemand.
/// </summary>
/// <param name="memberInfo">The member info.</param>
/// <param name="arguments">The arguments.</param>
/// <returns>A <see cref="InstanceDescriptor"/>.</returns>
[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
private static InstanceDescriptor CreateInstanceDescriptorPrivate(MemberInfo memberInfo, ICollection arguments) {
return new InstanceDescriptor(memberInfo, arguments);
}
}
}
|
