Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / CompMod / System / ComponentModel / ToolboxItemFilterAttribute.cs / 1 / ToolboxItemFilterAttribute.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Diagnostics; using System.Security.Permissions; ////// This attribute allows you to configure a filter that is used enable or disable toolbox items /// from being used on particular designers. For example, you may have a class of components /// that can only be used on a certain type of designer. You can configure a toolbox item /// filter to enforce that rule. For example, take a report designer that uses a component /// base class of ReportElement. You may want to make ReportElement toolbox items enabled only /// when a ReportDesigner is the active designer. To do this, you would add the following /// ToolboxItemFilter attributes to each class: /// /// [ToolboxItemFilter("MyReportFilterString", ToolboxItemFilterType.Require)] /// public class ReportElement : Component {} /// /// [ToolboxItemFilter("MyReportFilterString", ToolboxItemFilterType.Require)] /// public class ReportDesigner : Component {} /// /// These two filters specify that ReportElement toolbox items will only be /// enabled when a ReportDesigner is visible. By specifying a filter type of /// Require on the report designer class, this will disable any toolbox items /// that are not report elements. If the report designer specifed a filter type /// of "Allow" instead of "Require", other components would be enabled when the /// report designer was active. ReportElements would still be disabled when /// other designers were active, however, because ReportElement requires designers /// to have the given filter string. /// /// Toolbox item filtering is a useful way to restrict toolbox item visibility to /// cases where it is appropriate. This can help to avoid confusion for users, but /// you should use caution not to make items unusually restrictive. If you have a /// general purpose component, for example, you should allow the component to appear /// on any designer. /// /// The ASP.NET and Windows Forms designers both use filter attributes to prevent /// each other's components from being enabled. This is a useful restriction because, /// since each has several duplicate class names, it may be confusing to users and /// they may not know which controls to choose. /// /// [ AttributeUsage(AttributeTargets.Class, AllowMultiple=true, Inherited=true), Serializable ] public sealed class ToolboxItemFilterAttribute : Attribute { private ToolboxItemFilterType filterType; private string filterString; private string typeId; ////// Initializes a new ToolboxItemFilterAttribute with the provide filter string and a filter type of /// "Allow". /// public ToolboxItemFilterAttribute(string filterString) : this(filterString, ToolboxItemFilterType.Allow) { } ////// Initializes a new ToolboxItemFilterAttribute with the provide filter string and filter type. /// public ToolboxItemFilterAttribute(string filterString, ToolboxItemFilterType filterType) { if (filterString == null) filterString = String.Empty; this.filterString = filterString; this.filterType = filterType; } ////// Retrieves the filter string for this attribute. The filter string is a user-defined string that /// is used to identify matching attributes. /// public string FilterString { get { return filterString; } } ////// Retrieves the filter type for this attribute. The filter type determines how the filter string should /// be applied. /// public ToolboxItemFilterType FilterType { get { return filterType; } } ////// The unique identifier for this attribute. All ToolboxItemFilterAttributes with the same filter string /// are considered the same, so they return the same TypeId. /// public override object TypeId { get { if (typeId == null) { typeId = GetType().FullName + filterString; } return typeId; } } public override bool Equals(object obj) { if (obj == this) { return true; } ToolboxItemFilterAttribute other = obj as ToolboxItemFilterAttribute; return (other != null && other.FilterType.Equals(FilterType) && other.FilterString.Equals(FilterString)); } public override int GetHashCode() { // No need to hash on filter type as well; there shouldn't be that many duplicates. return filterString.GetHashCode(); } public override bool Match(object obj) { ToolboxItemFilterAttribute other = obj as ToolboxItemFilterAttribute; if (other == null) { return false; } // different filter string kills a match immediately. // if (!other.FilterString.Equals(FilterString)) { return false; } return true; } public override string ToString() { return filterString + "," + Enum.GetName(typeof(ToolboxItemFilterType), filterType); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.ComponentModel { using System; using System.Diagnostics; using System.Security.Permissions; ////// This attribute allows you to configure a filter that is used enable or disable toolbox items /// from being used on particular designers. For example, you may have a class of components /// that can only be used on a certain type of designer. You can configure a toolbox item /// filter to enforce that rule. For example, take a report designer that uses a component /// base class of ReportElement. You may want to make ReportElement toolbox items enabled only /// when a ReportDesigner is the active designer. To do this, you would add the following /// ToolboxItemFilter attributes to each class: /// /// [ToolboxItemFilter("MyReportFilterString", ToolboxItemFilterType.Require)] /// public class ReportElement : Component {} /// /// [ToolboxItemFilter("MyReportFilterString", ToolboxItemFilterType.Require)] /// public class ReportDesigner : Component {} /// /// These two filters specify that ReportElement toolbox items will only be /// enabled when a ReportDesigner is visible. By specifying a filter type of /// Require on the report designer class, this will disable any toolbox items /// that are not report elements. If the report designer specifed a filter type /// of "Allow" instead of "Require", other components would be enabled when the /// report designer was active. ReportElements would still be disabled when /// other designers were active, however, because ReportElement requires designers /// to have the given filter string. /// /// Toolbox item filtering is a useful way to restrict toolbox item visibility to /// cases where it is appropriate. This can help to avoid confusion for users, but /// you should use caution not to make items unusually restrictive. If you have a /// general purpose component, for example, you should allow the component to appear /// on any designer. /// /// The ASP.NET and Windows Forms designers both use filter attributes to prevent /// each other's components from being enabled. This is a useful restriction because, /// since each has several duplicate class names, it may be confusing to users and /// they may not know which controls to choose. /// /// [ AttributeUsage(AttributeTargets.Class, AllowMultiple=true, Inherited=true), Serializable ] public sealed class ToolboxItemFilterAttribute : Attribute { private ToolboxItemFilterType filterType; private string filterString; private string typeId; ////// Initializes a new ToolboxItemFilterAttribute with the provide filter string and a filter type of /// "Allow". /// public ToolboxItemFilterAttribute(string filterString) : this(filterString, ToolboxItemFilterType.Allow) { } ////// Initializes a new ToolboxItemFilterAttribute with the provide filter string and filter type. /// public ToolboxItemFilterAttribute(string filterString, ToolboxItemFilterType filterType) { if (filterString == null) filterString = String.Empty; this.filterString = filterString; this.filterType = filterType; } ////// Retrieves the filter string for this attribute. The filter string is a user-defined string that /// is used to identify matching attributes. /// public string FilterString { get { return filterString; } } ////// Retrieves the filter type for this attribute. The filter type determines how the filter string should /// be applied. /// public ToolboxItemFilterType FilterType { get { return filterType; } } ////// The unique identifier for this attribute. All ToolboxItemFilterAttributes with the same filter string /// are considered the same, so they return the same TypeId. /// public override object TypeId { get { if (typeId == null) { typeId = GetType().FullName + filterString; } return typeId; } } public override bool Equals(object obj) { if (obj == this) { return true; } ToolboxItemFilterAttribute other = obj as ToolboxItemFilterAttribute; return (other != null && other.FilterType.Equals(FilterType) && other.FilterString.Equals(FilterString)); } public override int GetHashCode() { // No need to hash on filter type as well; there shouldn't be that many duplicates. return filterString.GetHashCode(); } public override bool Match(object obj) { ToolboxItemFilterAttribute other = obj as ToolboxItemFilterAttribute; if (other == null) { return false; } // different filter string kills a match immediately. // if (!other.FilterString.Equals(FilterString)) { return false; } return true; } public override string ToString() { return filterString + "," + Enum.GetName(typeof(ToolboxItemFilterType), filterType); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PageBuildProvider.cs
- XmlSchemaImport.cs
- PrivilegedConfigurationManager.cs
- BitmapFrame.cs
- InnerItemCollectionView.cs
- ClockController.cs
- TabItemAutomationPeer.cs
- AnimationException.cs
- ServiceControllerDesigner.cs
- InvokePattern.cs
- AccessibleObject.cs
- _NestedMultipleAsyncResult.cs
- ButtonFlatAdapter.cs
- CellParagraph.cs
- NegotiateStream.cs
- OdbcConnectionFactory.cs
- Typography.cs
- HttpModuleActionCollection.cs
- CustomMenuItemCollection.cs
- XsdBuildProvider.cs
- OdbcConnectionPoolProviderInfo.cs
- SelectionItemPattern.cs
- RegionIterator.cs
- Double.cs
- MemberHolder.cs
- TracedNativeMethods.cs
- HtmlTernaryTree.cs
- InlineCollection.cs
- AccessibleObject.cs
- EventProperty.cs
- ObjectDataSourceDisposingEventArgs.cs
- CalendarTable.cs
- KeyedCollection.cs
- DataGridViewLayoutData.cs
- DataPagerFieldCollection.cs
- XmlConverter.cs
- SmtpNegotiateAuthenticationModule.cs
- EventItfInfo.cs
- SqlCommand.cs
- RegistrationServices.cs
- CompiledQueryCacheKey.cs
- Thread.cs
- OleDbInfoMessageEvent.cs
- CacheAxisQuery.cs
- TransformPattern.cs
- Size3D.cs
- DataGridViewRowHeaderCell.cs
- GenericUI.cs
- EncodingInfo.cs
- ExternalException.cs
- TracedNativeMethods.cs
- StorageBasedPackageProperties.cs
- EpmCustomContentWriterNodeData.cs
- MasterPage.cs
- CheckPair.cs
- Command.cs
- TrackBarRenderer.cs
- MarkerProperties.cs
- DataGrid.cs
- ValidatorUtils.cs
- SafeEventHandle.cs
- MetadataItemSerializer.cs
- precedingsibling.cs
- FileDataSourceCache.cs
- GC.cs
- XamlPoint3DCollectionSerializer.cs
- SyntaxCheck.cs
- WindowPattern.cs
- RtType.cs
- InputScopeAttribute.cs
- SqlNodeTypeOperators.cs
- OutputCacheProfileCollection.cs
- XmlName.cs
- WrappedReader.cs
- XappLauncher.cs
- OleDbErrorCollection.cs
- RelativeSource.cs
- XmlTextReader.cs
- TemplateBamlRecordReader.cs
- EntityTypeEmitter.cs
- CssClassPropertyAttribute.cs
- MessageTraceRecord.cs
- AuthorizationRule.cs
- OracleEncoding.cs
- TextTreeRootTextBlock.cs
- TypeElementCollection.cs
- controlskin.cs
- Hash.cs
- PngBitmapEncoder.cs
- SuppressMergeCheckAttribute.cs
- ReachSerializationCacheItems.cs
- NotFiniteNumberException.cs
- DataGridViewAdvancedBorderStyle.cs
- UntrustedRecipientException.cs
- DWriteFactory.cs
- MimeFormatter.cs
- Base64Decoder.cs
- SrgsDocumentParser.cs
- TabletDeviceInfo.cs
- MultipleCopiesCollection.cs