|
private GetReflectionType ( |
||
| type | ||
| return | ||
protected Attribute GetDefaultAttribute(Type attributeType)
{
lock (internalSyncObject)
{
if (_defaultAttributes == null)
{
_defaultAttributes = new Hashtable();
}
if (_defaultAttributes.ContainsKey(attributeType))
{
return((Attribute)_defaultAttributes[attributeType]);
}
Attribute attribute = null;
Type reflectionType = TypeDescriptor.GetReflectionType(attributeType);
FieldInfo field = reflectionType.GetField("Default", BindingFlags.GetField | BindingFlags.Public | BindingFlags.Static);
if ((field != null) && field.IsStatic)
{
attribute = (Attribute)field.GetValue(null);
}
else
{
ConstructorInfo constructor = reflectionType.UnderlyingSystemType.GetConstructor(new Type[0]);
if (constructor != null)
{
attribute = (Attribute)constructor.Invoke(new object[0]);
if (!attribute.IsDefaultAttribute())
{
attribute = null;
}
}
}
_defaultAttributes[attributeType] = attribute;
return(attribute);
}
}
public override TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
if (this.values == null)
{
Type reflectionType = TypeDescriptor.GetReflectionType(this.type);
if (reflectionType == null)
{
reflectionType = this.type;
}
FieldInfo[] fields = reflectionType.GetFields(BindingFlags.Public | BindingFlags.Static);
ArrayList list = null;
if ((fields != null) && (fields.Length > 0))
{
list = new ArrayList(fields.Length);
}
if (list != null)
{
foreach (FieldInfo info in fields)
{
BrowsableAttribute attribute = null;
foreach (Attribute attribute2 in info.GetCustomAttributes(typeof(BrowsableAttribute), false))
{
attribute = attribute2 as BrowsableAttribute;
}
if ((attribute == null) || attribute.Browsable)
{
object obj2 = null;
try
{
if (info.Name != null)
{
obj2 = Enum.Parse(this.type, info.Name);
}
}
catch (ArgumentException)
{
}
if (obj2 != null)
{
list.Add(obj2);
}
}
}
IComparer comparer = this.Comparer;
if (comparer != null)
{
list.Sort(comparer);
}
}
Array values = (list != null) ? ((Array)list.ToArray()) : null;
this.values = new TypeConverter.StandardValuesCollection(values);
}
return(this.values);
}
/// <summary>
/// Returns the default value for an attribute. This uses the following heuristic:
/// 1. It looks for a public static field named "Default".
/// </summary>
protected Attribute GetDefaultAttribute(Type attributeType)
{
if (attributeType == null)
{
throw new ArgumentNullException(nameof(attributeType));
}
lock (s_internalSyncObject)
{
if (s_defaultAttributes == null)
{
s_defaultAttributes = new Hashtable();
}
// If we have already encountered this, use what's in the table.
if (s_defaultAttributes.ContainsKey(attributeType))
{
return((Attribute)s_defaultAttributes[attributeType]);
}
Attribute attr = null;
// Not in the table, so do the legwork to discover the default value.
Type reflect = TypeDescriptor.GetReflectionType(attributeType);
FieldInfo field = reflect.GetField("Default", BindingFlags.Public | BindingFlags.Static | BindingFlags.GetField);
if (field != null && field.IsStatic)
{
attr = (Attribute)field.GetValue(null);
}
else
{
ConstructorInfo ci = reflect.UnderlyingSystemType.GetConstructor(Array.Empty <Type>());
if (ci != null)
{
attr = (Attribute)ci.Invoke(Array.Empty <object>());
// If we successfully created, verify that it is the
// default. Attributes don't have to abide by this rule.
if (!attr.IsDefaultAttribute())
{
attr = null;
}
}
}
s_defaultAttributes[attributeType] = attr;
return(attr);
}
}
/// <summary>
/// Returns the default value for an attribute. This uses the following heuristic:
/// 1. It looks for a public static field named "Default".
/// </summary>
protected Attribute?GetDefaultAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor | DynamicallyAccessedMemberTypes.PublicFields)] Type attributeType)
{
ArgumentNullException.ThrowIfNull(attributeType);
lock (s_internalSyncObject)
{
if (s_defaultAttributes == null)
{
s_defaultAttributes = new Dictionary <Type, Attribute?>();
}
// If we have already encountered this, use what's in the table.
if (s_defaultAttributes.TryGetValue(attributeType, out Attribute? defaultAttribute))
{
return(defaultAttribute);
}
Attribute?attr = null;
// Not in the table, so do the legwork to discover the default value.
Type reflect = TypeDescriptor.GetReflectionType(attributeType);
FieldInfo?field = reflect.GetField("Default", BindingFlags.Public | BindingFlags.Static | BindingFlags.GetField);
if (field != null && field.IsStatic)
{
attr = (Attribute?)field.GetValue(null);
}
else
{
ConstructorInfo?ci = reflect.UnderlyingSystemType.GetConstructor(Type.EmptyTypes);
if (ci != null)
{
attr = (Attribute)ci.Invoke(Array.Empty <object>());
// If we successfully created, verify that it is the
// default. Attributes don't have to abide by this rule.
if (!attr.IsDefaultAttribute())
{
attr = null;
}
}
}
s_defaultAttributes[attributeType] = attr;
return(attr);
}
}
/// <internalonly/>
/// <devdoc>
/// <para>Gets a collection of standard values for the data type this validator is
/// designed for.</para>
/// </devdoc>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
if (values == null)
{
// We need to get the enum values in this rather round-about way so we can filter
// out fields marked Browsable(false). Note that if multiple fields have the same value,
// the behavior is undefined, since what we return are just enum values, not names.
Type reflectType = TypeDescriptor.GetReflectionType(type);
if (reflectType == null)
{
reflectType = type;
}
FieldInfo[] fields = reflectType.GetFields(BindingFlags.Public | BindingFlags.Static);
ArrayList objValues = null;
if (fields != null && fields.Length > 0)
{
objValues = new ArrayList(fields.Length);
}
if (objValues != null)
{
foreach (FieldInfo field in fields)
{
BrowsableAttribute browsableAttr = null;
foreach (Attribute attr in field.GetCustomAttributes(typeof(BrowsableAttribute), false))
{
browsableAttr = attr as BrowsableAttribute;
}
if (browsableAttr == null || browsableAttr.Browsable)
{
object value = null;
try {
if (field.Name != null)
{
value = Enum.Parse(type, field.Name);
}
}
catch (ArgumentException) {
// Hmm, for some reason, the parse threw. Let us ignore this value.
}
if (value != null)
{
objValues.Add(value);
}
}
}
IComparer comparer = Comparer;
if (comparer != null)
{
objValues.Sort(comparer);
}
}
Array arr = (objValues != null) ? objValues.ToArray() : null;
values = new StandardValuesCollection(arr);
}
return(values);
}
