76 lines
2.7 KiB
C#
76 lines
2.7 KiB
C#
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Data.Linq;
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using System.Linq;
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using System.Reflection;
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using LinqMetaTable = System.Data.Linq.Mapping.MetaTable;
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using LinqMetaType = System.Data.Linq.Mapping.MetaType;
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namespace System.Web.DynamicData.ModelProviders {
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internal sealed class DLinqDataModelProvider : DataModelProvider {
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private ReadOnlyCollection<TableProvider> _roTables;
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private Dictionary<PropertyInfo, DLinqColumnProvider> _columnLookup = new Dictionary<PropertyInfo, DLinqColumnProvider>();
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private Func<object> ContextFactory { get; set; }
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public DLinqDataModelProvider(object contextInstance, Func<object> contextFactory) {
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ContextFactory = contextFactory;
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DataContext context = (DataContext)contextInstance ?? (DataContext)CreateContext();
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ContextType = context.GetType();
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DLinqTables = new List<TableProvider>();
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foreach (PropertyInfo prop in ContextType.GetProperties()) {
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Type entityType = GetEntityType(prop);
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if (entityType != null) {
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LinqMetaTable table = GetLinqTable(context, entityType);
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ProcessTable(table, table.RowType, prop.Name, prop);
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}
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}
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DLinqTables.ForEach(t => ((DLinqTableProvider)t).Initialize());
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_roTables = new ReadOnlyCollection<TableProvider>(DLinqTables);
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}
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private LinqMetaTable GetLinqTable(DataContext context, Type entityType) {
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return context.Mapping.GetTables().First(t => t.RowType.Type == entityType);
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}
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private Type GetEntityType(PropertyInfo prop) {
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//
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if (prop.PropertyType.IsGenericType &&
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prop.PropertyType.GetGenericTypeDefinition() == typeof(Table<>))
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return prop.PropertyType.GetGenericArguments()[0];
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return null;
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}
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private void ProcessTable(LinqMetaTable table, LinqMetaType rowType, string name, PropertyInfo prop) {
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DLinqTables.Add(new DLinqTableProvider(this, rowType, name, prop));
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foreach (LinqMetaType derivedType in rowType.DerivedTypes)
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ProcessTable(table, derivedType, derivedType.Name, prop);
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}
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internal Dictionary<PropertyInfo, DLinqColumnProvider> ColumnLookup {
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get {
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return _columnLookup;
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}
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}
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internal List<TableProvider> DLinqTables { get; private set; }
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public override object CreateContext() {
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return ContextFactory();
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}
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public override ReadOnlyCollection<TableProvider> Tables {
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get {
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return _roTables;
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}
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}
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}
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}
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