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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWebControls / System / Data / WebControls / EntityDataSourceViewSchema.cs / 1458001 / EntityDataSourceViewSchema.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.Entity; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Linq; using System.Text; using System.Reflection; namespace System.Web.UI.WebControls { internal class EntityDataSourceViewSchema : DataTable { internal EntityDataSourceViewSchema(EntityDataSourceWrapperCollection wrappers) { DataColumn column; Listkeys = new List (); PropertyDescriptorCollection properties = wrappers.GetItemProperties(null); MetadataWorkspace workspace = wrappers.Context.MetadataWorkspace; foreach (EntityDataSourceWrapperPropertyDescriptor property in properties) { Type propertyType = property.PropertyType; column = ConstructColumn(property); column.AllowDBNull = property.Column.IsNullable; EntityDataSourcePropertyColumn propertyColumn = property.Column as EntityDataSourcePropertyColumn; if (null!= propertyColumn && propertyColumn.IsKey) { keys.Add(column); } Columns.Add(column); } this.PrimaryKey = keys.ToArray(); } internal EntityDataSourceViewSchema(ITypedList typedList) { PropertyDescriptorCollection properties = typedList.GetItemProperties(null); CreateColumnsFromPropDescs(properties, null); } internal EntityDataSourceViewSchema(IEnumerable results) : this(results, null) { } /// /// Creates a view schema with a set of typed results and an optional set of keyName properties on those results /// internal EntityDataSourceViewSchema(IEnumerable results, string[] keyNames) { Type type = GetListItemType(results.GetType()); PropertyInfo[] infos = type.GetProperties(BindingFlags.Public | BindingFlags.Instance); PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(type); CreateColumnsFromPropDescs(properties, keyNames); } ////// Creates a set of DataTable columns from a collection of property descriptors and an optional /// set of key names from metadata /// private void CreateColumnsFromPropDescs(PropertyDescriptorCollection properties, string[] keyNames) { Listkeys = new List (); foreach (PropertyDescriptor property in properties) { System.ComponentModel.BrowsableAttribute attr = (System.ComponentModel.BrowsableAttribute)property.Attributes[typeof(System.ComponentModel.BrowsableAttribute)]; if (attr.Browsable) { DataColumn column = ConstructColumn(property); // If there are keyNames, check if this column is one of the keys if (keyNames != null && keyNames.Contains(column.ColumnName)) { keys.Add(column); } this.Columns.Add(column); } } if (keys.Count > 0) { this.PrimaryKey = keys.ToArray(); } } private static DataColumn ConstructColumn(PropertyDescriptor property) { DataColumn column = new DataColumn(); column.ColumnName = property.Name; Type propertyType = property.PropertyType; if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable<>)) { Type[] typeArguments = propertyType.GetGenericArguments(); Debug.Assert(typeArguments.Length == 1, "should only have one type argument from Nullable<> condition."); column.DataType = typeArguments[0]; column.AllowDBNull = true; } else { column.DataType = propertyType; column.AllowDBNull = !propertyType.IsValueType; } column.ReadOnly = property.IsReadOnly; column.Unique = false; column.AutoIncrement = false; column.MaxLength = -1; return column; } // see System.Data.Objects.DataRecordObjectView.cs private static PropertyInfo GetTypedIndexer(Type type) { PropertyInfo indexer = null; if (typeof(IList).IsAssignableFrom(type) || typeof(ITypedList).IsAssignableFrom(type) || typeof(IListSource).IsAssignableFrom(type)) { System.Reflection.PropertyInfo[] props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance); for (int idx = 0; idx < props.Length; idx++) { if (props[idx].GetIndexParameters().Length > 0 && props[idx].PropertyType != typeof(object)) { indexer = props[idx]; //Prefer the standard indexer, if there is one if (indexer.Name == "Item") { break; } } } } return indexer; } // see System.Data.Objects.DataRecordObjectView.cs private static Type GetListItemType(Type type) { Type itemType; if (typeof(Array).IsAssignableFrom(type)) { itemType = type.GetElementType(); } else { PropertyInfo typedIndexer = GetTypedIndexer(type); if (typedIndexer != null) { itemType = typedIndexer.PropertyType; } else { itemType = type; } } return itemType; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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