131 lines
4.2 KiB
C#
131 lines
4.2 KiB
C#
using System.Security.Permissions;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Web.DynamicData.ModelProviders;
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using System.Collections;
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using System.Web.Routing;
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namespace System.Web.DynamicData {
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/// <summary>
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/// A special column representing 1-many relationships
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/// </summary>
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public class MetaChildrenColumn : MetaColumn, IMetaChildrenColumn {
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public MetaChildrenColumn(MetaTable table, ColumnProvider entityMember)
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: base(table, entityMember) {
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}
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/// <summary>
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/// Perform initialization logic for this column
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/// </summary>
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internal protected override void Initialize() {
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base.Initialize();
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AssociationProvider a = this.Provider.Association;
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ChildTable = Model.GetTable(a.ToTable.Name, Table.DataContextType);
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if (a.ToColumn != null) {
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ColumnInOtherTable = ChildTable.GetColumn(a.ToColumn.Name);
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}
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}
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/// <summary>
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/// Returns whether this entity set column is in a Many To Many relationship
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/// </summary>
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public bool IsManyToMany {
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get {
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return Provider.Association != null &&
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Provider.Association.Direction == AssociationDirection.ManyToMany;
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}
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}
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/// <summary>
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/// The child table (e.g. Products in Categories<-Products)
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/// </summary>
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public MetaTable ChildTable { get; private set; }
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/// <summary>
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/// A pointer to the MetaColumn in the other table
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/// </summary>
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public MetaColumn ColumnInOtherTable { get; private set; }
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/// <summary>
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/// Override disabling sorting
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/// </summary>
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internal override string SortExpressionInternal {
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get {
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// children columns are not sortable
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return String.Empty;
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}
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}
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/*protected*/ internal override bool ScaffoldNoCache {
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get {
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// always display 1-many associations
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return true;
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}
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}
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/// <summary>
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/// Shortcut for getting the path to the list action for all entities in the child table that have the given row as a parent.
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/// </summary>
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/// <param name="row"></param>
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/// <returns></returns>
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public string GetChildrenListPath(object row) {
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return GetChildrenPath(PageAction.List, row);
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}
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public string GetChildrenPath(string action, object row) {
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// If there is no row, we can't get a path
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if (row == null)
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return String.Empty;
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return ChildTable.GetActionPath(action, GetRouteValues(row));
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}
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public string GetChildrenPath(string action, object row, string path) {
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// If there is no row, we can't get a path
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if (row == null)
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return String.Empty;
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if (String.IsNullOrEmpty(path)) {
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return GetChildrenPath(action, row);
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}
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// Build a query string param with our primary key
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RouteValueDictionary routeValues = GetRouteValues(row);
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// Add it to the path
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return QueryStringHandler.AddFiltersToPath(path, routeValues);
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}
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private RouteValueDictionary GetRouteValues(object row) {
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var routeValues = new RouteValueDictionary();
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IList<object> pkValues = Table.GetPrimaryKeyValues(row);
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var fkColumn = ColumnInOtherTable as MetaForeignKeyColumn;
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if (fkColumn != null) {
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Debug.Assert(fkColumn.ForeignKeyNames.Count == pkValues.Count);
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for (int i = 0; i < fkColumn.ForeignKeyNames.Count; i++) {
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routeValues.Add(fkColumn.ForeignKeyNames[i], Misc.SanitizeQueryStringValue(pkValues[i]));
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}
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}
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return routeValues;
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}
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IMetaTable IMetaChildrenColumn.ChildTable {
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get { return ChildTable; }
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}
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IMetaColumn IMetaChildrenColumn.ColumnInOtherTable {
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get { return ColumnInOtherTable; }
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}
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}
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}
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