Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ListViewGroupConverter.cs / 1 / ListViewGroupConverter.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; ////// /// ListViewGroupConverter is a class that can be used to convert /// ListViewGroup objects from one data type to another. Access this /// class through the TypeDescriptor. /// internal class ListViewGroupConverter : 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) && context != null && context.Instance is ListViewItem) { return true; } return base.CanConvertFrom(context, sourceType); } ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) { return true; } if (destinationType == typeof(string) && context != null && context.Instance is ListViewItem) { 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 (context != null && context.Instance != null) { ListViewItem item = context.Instance as ListViewItem; if (item != null && item.ListView != null) { foreach(ListViewGroup group in item.ListView.Groups) { if (group.Header == text) { return group; } } } } } if (value == null || value.Equals(SR.GetString(SR.toStringNone))) { return null; } 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"); } if (destinationType == typeof(InstanceDescriptor) && value is ListViewGroup) { ListViewGroup group = (ListViewGroup)value; ConstructorInfo ctor; // Header // ctor = typeof(ListViewGroup).GetConstructor(new Type[] {typeof(string), typeof(HorizontalAlignment)}); if (ctor != null) { return new InstanceDescriptor(ctor, new object[] { group.Header, group.HeaderAlignment }, false); } } if (destinationType == typeof(string) && value == null) { return SR.GetString(SR.toStringNone); } return base.ConvertTo(context, culture, value, destinationType); } ////// /// Retrieves a collection containing a set of standard values /// for the data type this validator is designed for. This /// will return null if the data type does not support a /// standard set of values. /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { if (context != null && context.Instance != null) { ListViewItem item = context.Instance as ListViewItem; if (item != null && item.ListView != null) { ArrayList list = new ArrayList(); foreach (ListViewGroup group in item.ListView.Groups) { list.Add(group); } list.Add(null); return new StandardValuesCollection(list); } } return null; } ////// /// Determines if the list of standard values returned from /// GetStandardValues is an exclusive list. If the list /// is exclusive, then no other values are valid, such as /// in an enum data type. If the list is not exclusive, /// then there are other valid values besides the list of /// standard values GetStandardValues provides. /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return true; } ////// /// Determines if this object supports a standard set of values /// that can be picked from a list. /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- GridViewUpdateEventArgs.cs
- ActiveDesignSurfaceEvent.cs
- TypeReference.cs
- HitTestDrawingContextWalker.cs
- PackageRelationshipCollection.cs
- ScriptReference.cs
- QilTernary.cs
- Column.cs
- SafeCertificateStore.cs
- Marshal.cs
- Margins.cs
- SQLDateTimeStorage.cs
- localization.cs
- Site.cs
- UICuesEvent.cs
- PublisherMembershipCondition.cs
- LogConverter.cs
- GridViewDeletedEventArgs.cs
- ACE.cs
- Substitution.cs
- WindowsIPAddress.cs
- PermissionAttributes.cs
- XamlSerializerUtil.cs
- PingReply.cs
- HelpProvider.cs
- Win32SafeHandles.cs
- ContentDisposition.cs
- StatusBarItem.cs
- TypeCodeDomSerializer.cs
- ShaperBuffers.cs
- NullableDoubleSumAggregationOperator.cs
- QilPatternFactory.cs
- Clock.cs
- FontWeightConverter.cs
- XPathNodePointer.cs
- IntSecurity.cs
- SecurityManager.cs
- FileDialog.cs
- Statements.cs
- SqlConnectionString.cs
- _ListenerResponseStream.cs
- TextFormatter.cs
- SemaphoreSecurity.cs
- HMACRIPEMD160.cs
- IconHelper.cs
- ValidatorCompatibilityHelper.cs
- XMLSyntaxException.cs
- AssemblyResourceLoader.cs
- DataGridViewRowContextMenuStripNeededEventArgs.cs
- ApplicationDirectoryMembershipCondition.cs
- CancellationState.cs
- PolyLineSegment.cs
- UserControl.cs
- TypeExtensionSerializer.cs
- TextPenaltyModule.cs
- SchemaTypeEmitter.cs
- ActivationServices.cs
- RightsManagementEncryptionTransform.cs
- MethodRental.cs
- DoubleLinkList.cs
- ToolStripItemImageRenderEventArgs.cs
- ViewManagerAttribute.cs
- ResolveCriteria.cs
- XsdBuilder.cs
- XmlSchemaInclude.cs
- IPAddress.cs
- ConfigurationStrings.cs
- DBSchemaTable.cs
- MasterPageBuildProvider.cs
- FixedTextContainer.cs
- FixedSOMImage.cs
- HtmlTextViewAdapter.cs
- ThreadStateException.cs
- HwndHost.cs
- StreamingContext.cs
- JoinCqlBlock.cs
- MediaEntryAttribute.cs
- SchemaCollectionCompiler.cs
- IOException.cs
- ThreadExceptionDialog.cs
- BitmapPalette.cs
- Trace.cs
- SettingsAttributes.cs
- _ConnectionGroup.cs
- ProviderIncompatibleException.cs
- SplitContainer.cs
- InfoCardXmlSerializer.cs
- SerialErrors.cs
- FormsAuthenticationModule.cs
- OleDbCommandBuilder.cs
- ConfigurationElementProperty.cs
- TrackingProfileCache.cs
- ToolStripControlHost.cs
- DllNotFoundException.cs
- XDeferredAxisSource.cs
- TextEditorSelection.cs
- _Win32.cs
- _ScatterGatherBuffers.cs
- HttpListenerContext.cs
- CqlErrorHelper.cs