Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / ReferenceConverter.cs / 1 / ReferenceConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.ComponentModel { using Microsoft.Win32; using System.Collections; using System.ComponentModel.Design; using System.Diagnostics; using System.Globalization; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Runtime.Serialization.Formatters; using System.Security.Permissions; ////// [HostProtection(SharedState = true)] public class ReferenceConverter : TypeConverter { private static readonly string none = SR.GetString(SR.toStringNone); private Type type; ///Provides a type converter to convert object references to and from various /// other representations. ////// public ReferenceConverter(Type type) { this.type = type; } ////// Initializes a new instance of the ///class. /// /// /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string) && context != null) { return true; } return base.CanConvertFrom(context, sourceType); } ///Gets a value indicating whether this converter can convert an object in the /// given source type to a reference object using the specified context. ////// /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string text = ((string)value).Trim(); if (!String.Equals(text, none) && context != null) { // Try the reference service first. // IReferenceService refSvc = (IReferenceService)context.GetService(typeof(IReferenceService)); if (refSvc != null) { object obj = refSvc.GetReference(text); if (obj != null) { return obj; } } // Now try IContainer // IContainer cont = context.Container; if (cont != null) { object obj = cont.Components[text]; if (obj != null) { return obj; } } } return null; } return base.ConvertFrom(context, culture, value); } ///Converts the given object to the reference type. ////// /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string)) { if (value != null) { // Try the reference service first. // if (context != null) { IReferenceService refSvc = (IReferenceService)context.GetService(typeof(IReferenceService)); if (refSvc != null) { string name = refSvc.GetName(value); if (name != null) { return name; } } } // Now see if this is an IComponent. // if (!Marshal.IsComObject(value) && value is IComponent) { IComponent comp = (IComponent)value; ISite site = comp.Site; if (site != null) { string name = site.Name; if (name != null) { return name; } } } // Couldn't find it. return String.Empty; } return none; } return base.ConvertTo(context, culture, value, destinationType); } ///Converts the given value object to the reference type /// using the specified context and arguments. ////// /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { object[] components = null; if (context != null) { ArrayList list = new ArrayList(); list.Add(null); // Try the reference service first. // IReferenceService refSvc = (IReferenceService)context.GetService(typeof(IReferenceService)); if (refSvc != null) { object[] objs = refSvc.GetReferences(type); int count = objs.Length; for (int i = 0; i < count; i++) { if (IsValueAllowed(context, objs[i])) list.Add(objs[i]); } } else { // Now try IContainer. // IContainer cont = context.Container; if (cont != null) { ComponentCollection objs = cont.Components; foreach(IComponent obj in objs) { if (obj != null && type.IsInstanceOfType(obj) && IsValueAllowed(context, obj)) { list.Add(obj); } } } } components = list.ToArray(); Array.Sort(components, 0, components.Length, new ReferenceComparer(this)); } return new StandardValuesCollection(components); } ///Gets a collection of standard values for the reference data type. ////// /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return true; } ///Gets a value indicating whether the list of standard values returned from /// ///is an exclusive list. /// /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } ///Gets a value indicating whether this object supports a standard set of values /// that can be picked from a list. ////// protected virtual bool IsValueAllowed(ITypeDescriptorContext context, object value) { return true; } ///Gets a value indicating whether a particular value can be added to /// the standard values collection. ////// IComparer object used for sorting references /// private class ReferenceComparer : IComparer { private ReferenceConverter converter; public ReferenceComparer(ReferenceConverter converter) { this.converter = converter; } public int Compare(object item1, object item2) { String itemName1 = converter.ConvertToString(item1); String itemName2 = converter.ConvertToString(item2); return string.Compare(itemName1, itemName2, false, CultureInfo.InvariantCulture); } } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- QueryOutputWriterV1.cs
- MailMessage.cs
- CodeMemberEvent.cs
- FileInfo.cs
- FolderBrowserDialog.cs
- SqlBinder.cs
- Bezier.cs
- HtmlAnchor.cs
- MetadataItemEmitter.cs
- ManifestSignedXml.cs
- KeyInterop.cs
- SqlAggregateChecker.cs
- TextOptions.cs
- safePerfProviderHandle.cs
- StorageScalarPropertyMapping.cs
- Frame.cs
- DetailsViewInsertedEventArgs.cs
- ListenerUnsafeNativeMethods.cs
- _BaseOverlappedAsyncResult.cs
- StateWorkerRequest.cs
- ISFTagAndGuidCache.cs
- WindowHideOrCloseTracker.cs
- XmlEncodedRawTextWriter.cs
- AuthenticateEventArgs.cs
- ArgumentsParser.cs
- Tablet.cs
- PropertyPushdownHelper.cs
- AppDomain.cs
- Automation.cs
- PerformanceCounterCategory.cs
- DefaultAutoFieldGenerator.cs
- UTF7Encoding.cs
- invalidudtexception.cs
- InvokeMethodActivityDesigner.cs
- BindingCompleteEventArgs.cs
- DataGridViewTextBoxEditingControl.cs
- ToolStripRendererSwitcher.cs
- XDeferredAxisSource.cs
- ProtocolsSection.cs
- SubMenuStyleCollectionEditor.cs
- TypefaceMetricsCache.cs
- CodeStatement.cs
- ToolStripContentPanelRenderEventArgs.cs
- TypeInitializationException.cs
- LinqMaximalSubtreeNominator.cs
- WorkflowServiceHost.cs
- GridViewColumn.cs
- PointF.cs
- ClientApiGenerator.cs
- Rotation3D.cs
- ReferentialConstraintRoleElement.cs
- TextSerializer.cs
- CachingHintValidation.cs
- securitycriticaldataformultiplegetandset.cs
- TCEAdapterGenerator.cs
- ScrollItemPattern.cs
- LogicalExpr.cs
- TableLayoutColumnStyleCollection.cs
- NullRuntimeConfig.cs
- Vertex.cs
- XmlQuerySequence.cs
- SystemIcmpV4Statistics.cs
- EventArgs.cs
- ProtocolViolationException.cs
- HelpEvent.cs
- CommandLibraryHelper.cs
- ControlType.cs
- WindowsTokenRoleProvider.cs
- DbParameterHelper.cs
- MatrixTransform3D.cs
- OleServicesContext.cs
- ItemChangedEventArgs.cs
- Setter.cs
- TransformFinalBlockRequest.cs
- InnerItemCollectionView.cs
- ClientBuildManager.cs
- ArraySubsetEnumerator.cs
- Viewport3DAutomationPeer.cs
- ArrayWithOffset.cs
- AuthorizationRuleCollection.cs
- SystemColors.cs
- StoreItemCollection.cs
- GroupBox.cs
- IntSecurity.cs
- Viewport3DAutomationPeer.cs
- WebPartManager.cs
- CommandManager.cs
- ContractMethodParameterInfo.cs
- TextHintingModeValidation.cs
- MultiBinding.cs
- Roles.cs
- InkCanvasFeedbackAdorner.cs
- TextPointerBase.cs
- BamlResourceContent.cs
- GifBitmapEncoder.cs
- SafeWaitHandle.cs
- XmlILIndex.cs
- CodeDomComponentSerializationService.cs
- PageParserFilter.cs
- WinEventTracker.cs