Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / SelectionRangeConverter.cs / 1305376 / SelectionRangeConverter.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
/*
*/
namespace System.Windows.Forms {
using System.Runtime.Serialization.Formatters;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
///
/// SelectionRangeConverter is a class that can be used to convert
/// SelectionRange objects from one data type to another. Access this
/// class through the TypeDescriptor.
///
public class SelectionRangeConverter : TypeConverter {
///
/// Determines if this converter can convert an object in the given source
/// type to the native type of the converter.
///
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string) || sourceType == typeof(DateTime)) {
return true;
}
return base.CanConvertFrom(context, sourceType);
}
///
/// Gets a value indicating whether this converter can
/// convert an object to the given destination type using the context.
///
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(DateTime)) {
return true;
}
return base.CanConvertTo(context, destinationType);
}
///
/// Converts the given object to the converter's native type.
///
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value is string) {
string text = ((string)value).Trim();
if (text.Length == 0) {
return new SelectionRange(DateTime.Now.Date, DateTime.Now.Date);
}
// Separate the string into the two dates, and parse each one
//
if (culture == null) {
culture = CultureInfo.CurrentCulture;
}
char separator = culture.TextInfo.ListSeparator[0];
string[] tokens = text.Split(new char[] {separator});
if (tokens.Length == 2) {
TypeConverter dateTimeConverter = TypeDescriptor.GetConverter(typeof(DateTime));
DateTime start = (DateTime)dateTimeConverter.ConvertFromString(context, culture, tokens[0]);
DateTime end = (DateTime)dateTimeConverter.ConvertFromString(context, culture, tokens[1]);
return new SelectionRange(start, end);
}
else {
throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat,
text,
"Start" + separator + " End"));
}
}
else if (value is DateTime) {
DateTime dt = (DateTime)value;
return new SelectionRange(dt, dt);
}
return base.ConvertFrom(context, culture, value);
}
///
/// Converts the given object to another type. The most common types to convert
/// are to and from a string object. The default implementation will make a call
/// to ToString on the object if the object is valid and if the destination
/// type is string. If this cannot convert to the desitnation type, this will
/// throw a NotSupportedException.
///
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == null) {
throw new ArgumentNullException("destinationType");
}
SelectionRange range = value as SelectionRange;
if (range != null) {
if (destinationType == typeof(string)) {
if (culture == null) {
culture = CultureInfo.CurrentCulture;
}
string sep = culture.TextInfo.ListSeparator + " ";
PropertyDescriptorCollection props = GetProperties(value);
string[] args = new string[props.Count];
for (int i = 0; i < props.Count; i++) {
object propValue = props[i].GetValue(value);
args[i] = TypeDescriptor.GetConverter(propValue).ConvertToString(context, culture, propValue);
}
return string.Join(sep, args);
}
if (destinationType == typeof(DateTime)) {
return range.Start;
}
if (destinationType == typeof(InstanceDescriptor)) {
ConstructorInfo ctor = typeof(SelectionRange).GetConstructor(new Type[] {
typeof(DateTime), typeof(DateTime)});
if (ctor != null) {
return new InstanceDescriptor(ctor, new object[] {range.Start, range.End});
}
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
///
/// Creates an instance of this type given a set of property values
/// for the object. This is useful for objects that are immutable, but still
/// want to provide changable properties.
///
public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) {
try
{
return new SelectionRange((DateTime)propertyValues["Start"],
(DateTime)propertyValues["End"]);
}
catch (InvalidCastException invalidCast)
{
throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry), invalidCast);
}
catch (NullReferenceException nullRef)
{
throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry), nullRef);
}
}
///
/// Determines if changing a value on this object should require a call to
/// CreateInstance to create a new value.
///
public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
return true;
}
///
/// Retrieves the set of properties for this type. By default, a type has
/// does not return any properties. An easy implementation of this method
/// can just call TypeDescriptor.GetProperties for the correct data type.
///
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) {
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(SelectionRange), attributes);
return props.Sort(new string[] {"Start", "End"});
}
///
/// Determines if this object supports properties. By default, this
/// is false.
///
public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
return true;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
/*
*/
namespace System.Windows.Forms {
using System.Runtime.Serialization.Formatters;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
///
/// SelectionRangeConverter is a class that can be used to convert
/// SelectionRange objects from one data type to another. Access this
/// class through the TypeDescriptor.
///
public class SelectionRangeConverter : TypeConverter {
///
/// Determines if this converter can convert an object in the given source
/// type to the native type of the converter.
///
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string) || sourceType == typeof(DateTime)) {
return true;
}
return base.CanConvertFrom(context, sourceType);
}
///
/// Gets a value indicating whether this converter can
/// convert an object to the given destination type using the context.
///
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(DateTime)) {
return true;
}
return base.CanConvertTo(context, destinationType);
}
///
/// Converts the given object to the converter's native type.
///
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value is string) {
string text = ((string)value).Trim();
if (text.Length == 0) {
return new SelectionRange(DateTime.Now.Date, DateTime.Now.Date);
}
// Separate the string into the two dates, and parse each one
//
if (culture == null) {
culture = CultureInfo.CurrentCulture;
}
char separator = culture.TextInfo.ListSeparator[0];
string[] tokens = text.Split(new char[] {separator});
if (tokens.Length == 2) {
TypeConverter dateTimeConverter = TypeDescriptor.GetConverter(typeof(DateTime));
DateTime start = (DateTime)dateTimeConverter.ConvertFromString(context, culture, tokens[0]);
DateTime end = (DateTime)dateTimeConverter.ConvertFromString(context, culture, tokens[1]);
return new SelectionRange(start, end);
}
else {
throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat,
text,
"Start" + separator + " End"));
}
}
else if (value is DateTime) {
DateTime dt = (DateTime)value;
return new SelectionRange(dt, dt);
}
return base.ConvertFrom(context, culture, value);
}
///
/// Converts the given object to another type. The most common types to convert
/// are to and from a string object. The default implementation will make a call
/// to ToString on the object if the object is valid and if the destination
/// type is string. If this cannot convert to the desitnation type, this will
/// throw a NotSupportedException.
///
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == null) {
throw new ArgumentNullException("destinationType");
}
SelectionRange range = value as SelectionRange;
if (range != null) {
if (destinationType == typeof(string)) {
if (culture == null) {
culture = CultureInfo.CurrentCulture;
}
string sep = culture.TextInfo.ListSeparator + " ";
PropertyDescriptorCollection props = GetProperties(value);
string[] args = new string[props.Count];
for (int i = 0; i < props.Count; i++) {
object propValue = props[i].GetValue(value);
args[i] = TypeDescriptor.GetConverter(propValue).ConvertToString(context, culture, propValue);
}
return string.Join(sep, args);
}
if (destinationType == typeof(DateTime)) {
return range.Start;
}
if (destinationType == typeof(InstanceDescriptor)) {
ConstructorInfo ctor = typeof(SelectionRange).GetConstructor(new Type[] {
typeof(DateTime), typeof(DateTime)});
if (ctor != null) {
return new InstanceDescriptor(ctor, new object[] {range.Start, range.End});
}
}
}
return base.ConvertTo(context, culture, value, destinationType);
}
///
/// Creates an instance of this type given a set of property values
/// for the object. This is useful for objects that are immutable, but still
/// want to provide changable properties.
///
public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) {
try
{
return new SelectionRange((DateTime)propertyValues["Start"],
(DateTime)propertyValues["End"]);
}
catch (InvalidCastException invalidCast)
{
throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry), invalidCast);
}
catch (NullReferenceException nullRef)
{
throw new ArgumentException(SR.GetString(SR.PropertyValueInvalidEntry), nullRef);
}
}
///
/// Determines if changing a value on this object should require a call to
/// CreateInstance to create a new value.
///
public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
return true;
}
///
/// Retrieves the set of properties for this type. By default, a type has
/// does not return any properties. An easy implementation of this method
/// can just call TypeDescriptor.GetProperties for the correct data type.
///
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) {
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(SelectionRange), attributes);
return props.Sort(new string[] {"Start", "End"});
}
///
/// Determines if this object supports properties. By default, this
/// is false.
///
public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
return true;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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