Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / TypeSchema.cs / 1 / TypeSchema.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; using System.Reflection; ////// Represents a schema based on an arbitrary object. /// /// DataSets and DataTables are special cased and processed for their strongly-typed properties. /// Types that implement the generic IEnumerable<T> will use the bound type T as their row type. /// Arbitrary enumerables are processed using their indexer's type. /// All other objects are directly reflected on and their public properties are exposed as fields. /// /// DataSet and DataTable schema is retrieved by creating instances of the /// objects, whereas all other schema is retrived using Reflection. /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public sealed class TypeSchema : IDataSourceSchema { private Type _type; private IDataSourceViewSchema[] _schema; public TypeSchema(Type type) { if (type == null) { throw new ArgumentNullException("type"); } _type = type; if (typeof(DataTable).IsAssignableFrom(_type)) { _schema = GetDataTableSchema(_type); } else { if (typeof(DataSet).IsAssignableFrom(_type)) { _schema = GetDataSetSchema(_type); } else { if (IsBoundGenericEnumerable(_type)) { _schema = GetGenericEnumerableSchema(_type); } else { if (typeof(IEnumerable).IsAssignableFrom(_type)) { _schema = GetEnumerableSchema(_type); } else { _schema = GetTypeSchema(_type); } } } } } public IDataSourceViewSchema[] GetViews() { return _schema; } ////// Gets schema for a strongly typed DataSet. /// private static IDataSourceViewSchema[] GetDataSetSchema(Type t) { try { DataSet dataSet = Activator.CreateInstance(t) as DataSet; System.Collections.Generic.Listviews = new System.Collections.Generic.List (); foreach (DataTable table in dataSet.Tables) { views.Add(new DataSetViewSchema(table)); } return views.ToArray(); } catch { return null; } } /// /// Gets schema for a strongly typed DataTable. /// private static IDataSourceViewSchema[] GetDataTableSchema(Type t) { try { DataTable table = Activator.CreateInstance(t) as DataTable; DataSetViewSchema tableSchema = new DataSetViewSchema(table); return new IDataSourceViewSchema[1] { tableSchema }; } catch { return null; } } ////// Gets schema for a strongly typed enumerable. /// private static IDataSourceViewSchema[] GetEnumerableSchema(Type t) { TypeEnumerableViewSchema enumerableSchema = new TypeEnumerableViewSchema(String.Empty, t); return new IDataSourceViewSchema[1] { enumerableSchema }; } ////// Gets schema for a generic IEnumerable. /// private static IDataSourceViewSchema[] GetGenericEnumerableSchema(Type t) { TypeGenericEnumerableViewSchema enumerableSchema = new TypeGenericEnumerableViewSchema(String.Empty, t); return new IDataSourceViewSchema[1] { enumerableSchema }; } ////// Gets schema for an arbitrary type. /// private static IDataSourceViewSchema[] GetTypeSchema(Type t) { TypeViewSchema typeSchema = new TypeViewSchema(String.Empty, t); return new IDataSourceViewSchema[1] { typeSchema }; } ////// Returns true if the type implements IEnumerable<T> with a bound /// value for T. In other words, this type: /// public class Foo<T> : IEnumerable<T> { ... } /// Does not bind the value of T. However this type: /// public class Foo2 : IEnumerable<string> { ... } /// Does have T bound to the type System.String. /// /// Although it would seem that this check: /// typeof(IEnumerable<>).IsAssignableFrom(t) /// Might be sufficient, it actually doesn't work, possibly due /// to covariance/contravariance limitations, etc. /// internal static bool IsBoundGenericEnumerable(Type t) { Type[] interfaces = null; if (t.IsInterface && t.IsGenericType && t.GetGenericTypeDefinition() == typeof(IEnumerable<>)) { // If the type already is IEnumerable, that's the interface we want to inspect interfaces = new Type[] { t }; } else { // Otherwise we get a list of all the interafaces the type implements interfaces = t.GetInterfaces(); } foreach (Type i in interfaces) { if (i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IEnumerable<>)) { Type[] genericArguments = i.GetGenericArguments(); Debug.Assert(genericArguments != null && genericArguments.Length == 1, "Expected IEnumerable to have a generic argument"); // If a type has IsGenericParameter=true that means it is not bound. return !genericArguments[0].IsGenericParameter; } } return false; } } } // 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
- DataSvcMapFile.cs
- Message.cs
- XmlSignatureManifest.cs
- AdapterDictionary.cs
- WebEventTraceProvider.cs
- SymLanguageType.cs
- HTMLTextWriter.cs
- DifferencingCollection.cs
- StringPropertyBuilder.cs
- ThemeDirectoryCompiler.cs
- InfiniteIntConverter.cs
- LinqDataSourceHelper.cs
- NameValuePair.cs
- SecurityDescriptor.cs
- WebPartManager.cs
- odbcmetadatacollectionnames.cs
- SByteConverter.cs
- ExtractedStateEntry.cs
- SortDescriptionCollection.cs
- WebPartConnectionsDisconnectVerb.cs
- TableLayoutColumnStyleCollection.cs
- OrthographicCamera.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- ConfigurationPropertyCollection.cs
- RoleGroupCollection.cs
- UnaryNode.cs
- ExpressionBuilderCollection.cs
- ComponentConverter.cs
- BookmarkCallbackWrapper.cs
- CollectionViewSource.cs
- EntryPointNotFoundException.cs
- Size.cs
- BaseParagraph.cs
- ObjectSecurity.cs
- GenericEnumerator.cs
- CultureSpecificStringDictionary.cs
- ChannelDispatcher.cs
- Wizard.cs
- ImportContext.cs
- ContextStack.cs
- SudsCommon.cs
- BypassElement.cs
- Win32SafeHandles.cs
- StreamUpdate.cs
- ProjectionPathSegment.cs
- Processor.cs
- ToolStripCustomTypeDescriptor.cs
- EmptyReadOnlyDictionaryInternal.cs
- FileDialogPermission.cs
- PassportAuthentication.cs
- ResourcesGenerator.cs
- CodeStatement.cs
- ReadOnlyCollection.cs
- HideDisabledControlAdapter.cs
- LoadedEvent.cs
- DesignerActionUIStateChangeEventArgs.cs
- AdPostCacheSubstitution.cs
- ServiceContractListItem.cs
- ProcessProtocolHandler.cs
- SingleStorage.cs
- ButtonFlatAdapter.cs
- printdlgexmarshaler.cs
- MemberDomainMap.cs
- PropertyGroupDescription.cs
- SqlDataSourceStatusEventArgs.cs
- FileDialogCustomPlaces.cs
- WindowsComboBox.cs
- XmlDataSourceNodeDescriptor.cs
- SafeSecurityHandles.cs
- SystemFonts.cs
- HashMembershipCondition.cs
- TimeSpanSecondsOrInfiniteConverter.cs
- ContainerActivationHelper.cs
- PointConverter.cs
- DbSetClause.cs
- DrawingContextWalker.cs
- Message.cs
- MemoryRecordBuffer.cs
- PasswordRecovery.cs
- TraceProvider.cs
- FormsAuthenticationUser.cs
- Mapping.cs
- NativeMethodsCLR.cs
- SHA1CryptoServiceProvider.cs
- ExpiredSecurityTokenException.cs
- DWriteFactory.cs
- Fonts.cs
- Stroke2.cs
- SessionStateSection.cs
- httpserverutility.cs
- XmlSignificantWhitespace.cs
- HTMLTextWriter.cs
- TailPinnedEventArgs.cs
- FilterInvalidBodyAccessException.cs
- TreeNodeEventArgs.cs
- ConfigurationValidatorBase.cs
- CmsUtils.cs
- TemplateKey.cs
- RowBinding.cs
- ItemsControl.cs