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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / ModelProviders / AssociationProvider.cs / 1305376 / AssociationProvider.cs
using System.Collections.ObjectModel; using System.Globalization; using System.Web.Resources; namespace System.Web.DynamicData.ModelProviders { ////// Specifies the association cardinality /// public enum AssociationDirection { ////// 1-1 /// OneToOne, ////// one to many /// OneToMany, ////// many to one /// ManyToOne, ////// many to many /// ManyToMany } ////// Base provider class for associations between columns /// Each provider type (e.g. Linq To Sql, Entity Framework, 3rd party) extends this class. /// public abstract class AssociationProvider { private TableProvider _toTable; ////// The type of association /// public virtual AssociationDirection Direction { get; protected set; } ////// The source column of the association /// public virtual ColumnProvider FromColumn { get; protected set; } ////// The destination table of the association /// public virtual TableProvider ToTable { get { if (_toTable != null) { return _toTable; } if (ToColumn != null) { return ToColumn.Table; } return null; } protected set { _toTable = value; } } ////// The destination column of the association /// public virtual ColumnProvider ToColumn { get; protected set; } ////// Returns true if the From Column part of the primary key of its table /// e.g. Order and Product are PKs in the Order_Details table /// public virtual bool IsPrimaryKeyInThisTable { get; protected set; } ////// The names of the underlying foreign keys that make up this association /// [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification="It's a readonly collection, so the warning is incorrect")] public virtual ReadOnlyCollectionForeignKeyNames { get; protected set; } /// /// Returns a string representing the sort expression that would be used for /// sorting the column represented by this association. The parameter is the /// property of the strongly typed entity used as the sort key for that entity. /// For example, assume that this association represents the Category column /// in the Products table. The sortColumn paramater is "CategoryName", /// meaning that this method is being asked to return the sort expression for /// sorting the Category column by the CategoryName property of the Category entity. /// The result sort expression would be "Category.CategoryName". /// The result of this method should be affected by whether the underlying data /// model is capable of sorting the entity by the given sort column (see /// ColumnProvider.IsSortable). The method can return a null value to indicate /// that sorting is not supported. /// /// the column to sort the entity by ///the sort expression string, or null if sort is not supported for the /// given sort column public virtual string GetSortExpression(ColumnProvider sortColumn) { return null; } internal string GetSortExpression(ColumnProvider sortColumn, string format) { if (Direction == AssociationDirection.OneToMany || Direction == AssociationDirection.ManyToMany) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.AssociationProvider_DirectionDoesNotSupportSorting, Direction)); } if (sortColumn == null) { throw new ArgumentNullException("sortColumn"); } if (!ToTable.Columns.Contains(sortColumn)) { throw new ArgumentException(DynamicDataResources.AssociationProvider_SortColumnDoesNotBelongToEndTable, "sortColumn"); } if (sortColumn.IsSortable) { return String.Format(CultureInfo.InvariantCulture, format, FromColumn.Name, sortColumn.Name); } else { return null; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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