Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / RelatedCurrencyManager.cs / 1 / RelatedCurrencyManager.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using Microsoft.Win32; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.ComponentModel; using System.Collections; ////// /// internal class RelatedCurrencyManager : CurrencyManager { BindingManagerBase parentManager; string dataField; PropertyDescriptor fieldInfo; bool ignoreParentCurrentItemChanged = false; [ SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors") // If the constructor does not set the dataSource // it would be a breaking change. ] internal RelatedCurrencyManager(BindingManagerBase parentManager, string dataField) : base(null) { Bind(parentManager, dataField); } internal void Bind(BindingManagerBase parentManager, string dataField) { Debug.Assert(parentManager != null, "How could this be a null parentManager."); // Unwire previous BindingManagerBase UnwireParentManager(this.parentManager); this.parentManager = parentManager; this.dataField = dataField; this.fieldInfo = parentManager.GetItemProperties().Find(dataField, true); if (fieldInfo == null || !typeof(IList).IsAssignableFrom(fieldInfo.PropertyType)) { throw new ArgumentException(SR.GetString(SR.RelatedListManagerChild, dataField)); } this.finalType = fieldInfo.PropertyType; // Wire new BindingManagerBase WireParentManager(this.parentManager); ParentManager_CurrentItemChanged(parentManager, EventArgs.Empty); } private void UnwireParentManager(BindingManagerBase bmb) { if (bmb != null) { bmb.CurrentItemChanged -= new EventHandler(ParentManager_CurrentItemChanged); if (bmb is CurrencyManager) { (bmb as CurrencyManager).MetaDataChanged -= new EventHandler(ParentManager_MetaDataChanged); } } } private void WireParentManager(BindingManagerBase bmb) { if (bmb != null) { bmb.CurrentItemChanged += new EventHandler(ParentManager_CurrentItemChanged); if (bmb is CurrencyManager) { (bmb as CurrencyManager).MetaDataChanged += new EventHandler(ParentManager_MetaDataChanged); } } } internal override PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors) { PropertyDescriptor[] accessors; if (listAccessors != null && listAccessors.Length > 0) { accessors = new PropertyDescriptor[listAccessors.Length + 1]; listAccessors.CopyTo(accessors, 1); } else { accessors = new PropertyDescriptor[1]; } // Set this accessor (add to the beginning) accessors[0] = this.fieldInfo; // Get props return parentManager.GetItemProperties(accessors); } ///Represents the child version of the System.Windows.Forms.ListManager /// that is used when a parent/child relationship exists in a System.Windows.Forms.DataSet. ////// /// public override PropertyDescriptorCollection GetItemProperties() { return GetItemProperties(null); } //Gets the properties of the item. ///// internal override string GetListName() { string name = GetListName(new ArrayList()); if (name.Length > 0) { return name; } return base.GetListName(); } ///Gets the name of the list. ///// /// protected internal override string GetListName(ArrayList listAccessors) { listAccessors.Insert(0, fieldInfo); return parentManager.GetListName(listAccessors); } private void ParentManager_MetaDataChanged(object sender, EventArgs e) { // Propagate MetaDataChanged events from the parent manager base.OnMetaDataChanged(e); } private void ParentManager_CurrentItemChanged(object sender, EventArgs e) { if (this.ignoreParentCurrentItemChanged) { return; } int oldlistposition = this.listposition; // we only pull the data from the controls into the backEnd. we do not care about keeping the lastGoodKnownRow // when we are about to change the entire list in this currencymanager. try { PullData(); } catch (Exception ex) { OnDataError(ex); } if (parentManager is CurrencyManager) { CurrencyManager curManager = (CurrencyManager) parentManager; if (curManager.Count > 0) { // Parent list has a current row, so get the related list from the relevant property on that row. SetDataSource(fieldInfo.GetValue(curManager.Current)); listposition = (Count > 0 ? 0 : -1); } else { // APPCOMPAT: bring back the Everett behavior where the currency manager adds an item and // then it cancels the addition. // vsw 427731. // // really, really hocky. // will throw if the list in the curManager is not IBindingList // and this will fail if the IBindingList does not have list change notification. read on.... // when a new item will get added to an empty parent table, // the table will fire OnCurrentChanged and this method will get executed again // allowing us to set the data source to an object with the right properties (so we can show // metadata at design time). // we then call CancelCurrentEdit to remove the dummy row, but making sure to ignore any // OnCurrentItemChanged that results from this action (to avoid infinite recursion) curManager.AddNew(); try { this.ignoreParentCurrentItemChanged = true; curManager.CancelCurrentEdit(); } finally { this.ignoreParentCurrentItemChanged = false; } } } else { // Case where the parent is not a list, but a single object SetDataSource(fieldInfo.GetValue(parentManager.Current)); listposition = (Count > 0 ? 0 : -1); } if (oldlistposition != listposition) OnPositionChanged(EventArgs.Empty); OnCurrentChanged(EventArgs.Empty); OnCurrentItemChanged(EventArgs.Empty); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.Gets the name of the specified list. ///
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