Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / SelectionRangeConverter.cs / 1 / 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); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(DateTime)) { return true; } return base.CanConvertTo(context, destinationType); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// 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.
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