Code:
/ DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / webcontrols / LinqDataSource.cs / 2 / LinqDataSource.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System.Collections; using System.Collections.ObjectModel; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Drawing; using System.Drawing.Design; using System.Globalization; using System.Security.Permissions; using System.Web.Resources; using System.Web.UI; // Represents a data source that applies LINQ expressions against a business object in order to perform the Select // operation. When the Delete, Insert and Update operations are enabled the business object, specified in // ContextTypeName, must be a LINQ TO SQL DataContext. The LINQ expressions are applied in the order of Where, // OrderBy, GroupBy, OrderGroupsBy, Select. [ AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal), AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal), DefaultEvent("Selecting"), DefaultProperty("ContextTypeName"), Designer("System.Web.UI.Design.WebControls.LinqDataSourceDesigner, " + AssemblyRef.SystemWebExtensionsDesign), ParseChildren(true), PersistChildren(false), ResourceDescription("LinqDataSource_Description"), ResourceDisplayName("LinqDataSource_DisplayName"), ToolboxBitmap(typeof(LinqDataSource), "LinqDataSource.ico") ] public class LinqDataSource : DataSourceControl { private const string DefaultViewName = "DefaultView"; private LinqDataSourceView _view; private ICollection _viewNames; private readonly new IPage _page; public LinqDataSource() { } // internal constructor that takes mocks for unit tests. internal LinqDataSource(IDynamicQueryable dynamicQueryable, ILinqToSql linqToSql) { View = new LinqDataSourceView(this, DefaultViewName, Context, dynamicQueryable, linqToSql); } // internal constructor that takes page mock for unit tests. internal LinqDataSource(IPage page) { _page = page; } [ DefaultValue(false), Category("Behavior"), ResourceDescription("LinqDataSource_AutoGenerateOrderByClause"), ] public bool AutoGenerateOrderByClause { get { return View.AutoGenerateOrderByClause; } set { View.AutoGenerateOrderByClause = value; } } [ DefaultValue(false), Category("Behavior"), ResourceDescription("LinqDataSource_AutoGenerateWhereClause"), ] public bool AutoGenerateWhereClause { get { return View.AutoGenerateWhereClause; } set { View.AutoGenerateWhereClause = value; } } [ DefaultValue(true), Category("Behavior"), ResourceDescription("LinqDataSource_AutoPage"), ] public bool AutoPage { get { return View.AutoPage; } set { View.AutoPage = value; } } [ DefaultValue(true), Category("Behavior"), ResourceDescription("LinqDataSource_AutoSort"), ] public bool AutoSort { get { return View.AutoSort; } set { View.AutoSort = value; } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_ContextTypeName"), ] public string ContextTypeName { get { return View.ContextTypeName; } set { View.ContextTypeName = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_DeleteParameters"), Browsable(false) ] public ParameterCollection DeleteParameters { get { return View.DeleteParameters; } } [ DefaultValue(false), Category("Behavior"), ResourceDescription("LinqDataSource_EnableDelete"), ] public bool EnableDelete { get { return View.EnableDelete; } set { View.EnableDelete = value; } } [ DefaultValue(false), Category("Behavior"), ResourceDescription("LinqDataSource_EnableInsert"), ] public bool EnableInsert { get { return View.EnableInsert; } set { View.EnableInsert = value; } } [ DefaultValue(false), Category("Behavior"), ResourceDescription("LinqDataSource_EnableUpdate"), ] public bool EnableUpdate { get { return View.EnableUpdate; } set { View.EnableUpdate = value; } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_GroupBy"), ] public string GroupBy { get { return View.GroupBy; } set { View.GroupBy = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_GroupByParameters"), Browsable(false) ] public ParameterCollection GroupByParameters { get { return View.GroupByParameters; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_InsertParameters"), Browsable(false) ] public ParameterCollection InsertParameters { get { return View.InsertParameters; } } internal IPage IPage { get { if (_page != null) { return _page; } else { Page page = Page; if (page == null) { throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull); } return new PageWrapper(page); } } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_OrderBy"), ] public string OrderBy { get { return View.OrderBy; } set { View.OrderBy = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_OrderByParameters"), Browsable(false) ] public ParameterCollection OrderByParameters { get { return View.OrderByParameters; } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_OrderGroupsBy"), ] public string OrderGroupsBy { get { return View.OrderGroupsBy; } set { View.OrderGroupsBy = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_OrderGroupsByParameters"), Browsable(false) ] public ParameterCollection OrderGroupsByParameters { get { return View.OrderGroupsByParameters; } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_Select"), ] public string Select { get { return View.SelectNew; } set { View.SelectNew = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_SelectParameters"), Browsable(false) ] public ParameterCollection SelectParameters { get { return View.SelectNewParameters; } } [ DefaultValue(true), Category("Behavior"), ResourceDescription("LinqDataSource_StoreOriginalValuesInViewState"), ] public bool StoreOriginalValuesInViewState { get { return View.StoreOriginalValuesInViewState; } set { View.StoreOriginalValuesInViewState = value; } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_TableName"), ] public string TableName { get { return View.TableName; } set { View.TableName = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_UpdateParameters"), Browsable(false) ] public ParameterCollection UpdateParameters { get { return View.UpdateParameters; } } internal LinqDataSourceView View { get { if (_view == null) { View = new LinqDataSourceView(this, DefaultViewName, Context); } return _view; } private set { _view = value; if ((_view != null) && IsTrackingViewState) { ((IStateManager)_view).TrackViewState(); } } } [ DefaultValue(""), Category("Data"), ResourceDescription("LinqDataSource_Where"), ] public string Where { get { return View.Where; } set { View.Where = value; } } [ DefaultValue(null), MergableProperty(false), PersistenceMode(PersistenceMode.InnerProperty), Category("Data"), ResourceDescription("LinqDataSource_WhereParameters"), Browsable(false) ] public ParameterCollection WhereParameters { get { return View.WhereParameters; } } [ Category("Data"), ResourceDescription("LinqDataSource_ContextCreated"), ] public event EventHandlerContextCreated { add { View.ContextCreated += value; } remove { View.ContextCreated -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_ContextCreating"), ] public event EventHandler ContextCreating { add { View.ContextCreating += value; } remove { View.ContextCreating -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_ContextDisposing"), ] public event EventHandler ContextDisposing { add { View.ContextDisposing += value; } remove { View.ContextDisposing -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Deleted"), ] public event EventHandler Deleted { add { View.Deleted += value; } remove { View.Deleted -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Deleting"), ] public event EventHandler Deleting { add { View.Deleting += value; } remove { View.Deleting -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Inserted"), ] public event EventHandler Inserted { add { View.Inserted += value; } remove { View.Inserted -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Inserting"), ] public event EventHandler Inserting { add { View.Inserting += value; } remove { View.Inserting -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Selected"), ] public event EventHandler Selected { add { View.Selected += value; } remove { View.Selected -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Selecting"), ] public event EventHandler Selecting { add { View.Selecting += value; } remove { View.Selecting -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Updated"), ] public event EventHandler Updated { add { View.Updated += value; } remove { View.Updated -= value; } } [ Category("Data"), ResourceDescription("LinqDataSource_Updating"), ] public event EventHandler Updating { add { View.Updating += value; } remove { View.Updating -= value; } } public int Delete(IDictionary keys, IDictionary oldValues) { return View.Delete(keys, oldValues); } protected override DataSourceView GetView(string viewName) { if (viewName == null) { throw new ArgumentNullException("viewName"); } // viewName comes from the DataMember property on the databound control and is an empty string // by default. An empty string should be treated as if it were the default view name. if ((viewName.Length != 0) && !String.Equals(viewName, DefaultViewName, StringComparison.OrdinalIgnoreCase)) { throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.LinqDataSource_InvalidViewName, ID, DefaultViewName), "viewName"); } return View; } protected override ICollection GetViewNames() { if (_viewNames == null) { _viewNames = new ReadOnlyCollection (new string[] { DefaultViewName }); } return _viewNames; } public int Insert(IDictionary values) { return View.Insert(values); } private void LoadCompleteEventHandler(object sender, EventArgs e) { WhereParameters.UpdateValues(Context, this); OrderByParameters.UpdateValues(Context, this); GroupByParameters.UpdateValues(Context, this); OrderGroupsByParameters.UpdateValues(Context, this); SelectParameters.UpdateValues(Context, this); } protected override void LoadViewState(object savedState) { if (savedState == null) { base.LoadViewState(null); } else { Pair myState = (Pair)savedState; base.LoadViewState(myState.First); if (myState.Second != null) { ((IStateManager)View).LoadViewState(myState.Second); } } } [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")] protected internal override void OnInit(EventArgs e) { base.OnInit(e); IPage.LoadComplete += new EventHandler(LoadCompleteEventHandler); if (StoreOriginalValuesInViewState && (EnableUpdate || EnableDelete)) { IPage.RegisterRequiresViewStateEncryption(); } } [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")] protected internal override void OnUnload(EventArgs e) { base.OnUnload(e); // keeping the data context alive until Unload so that users can use deferred query evaluation. if (_view != null) { _view.ReleaseContext(); } } protected override object SaveViewState() { Pair myState = new Pair(); myState.First = base.SaveViewState(); if (_view != null) { myState.Second = ((IStateManager)_view).SaveViewState(); } if ((myState.First == null) && (myState.Second == null)) { return null; } return myState; } protected override void TrackViewState() { base.TrackViewState(); if (_view != null) { ((IStateManager)_view).TrackViewState(); } } public int Update(IDictionary keys, IDictionary values, IDictionary oldValues) { return View.Update(keys, values, oldValues); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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