Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / RelatedPropertyManager.cs / 1 / RelatedPropertyManager.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 RelatedPropertyManager : PropertyManager { BindingManagerBase parentManager; string dataField; PropertyDescriptor fieldInfo; [ SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors") // If the constructor does not set the dataSource // it would be a breaking change. ] internal RelatedPropertyManager(BindingManagerBase parentManager, string dataField) : base(GetCurrentOrNull(parentManager), dataField) { Bind(parentManager, dataField); } private void Bind(BindingManagerBase parentManager, string dataField) { Debug.Assert(parentManager != null, "How could this be a null parentManager."); this.parentManager = parentManager; this.dataField = dataField; this.fieldInfo = parentManager.GetItemProperties().Find(dataField, true); if (fieldInfo == null) throw new ArgumentException(SR.GetString(SR.RelatedListManagerChild, dataField)); // this.finalType = fieldInfo.PropertyType; parentManager.CurrentItemChanged += new EventHandler(ParentManager_CurrentItemChanged); Refresh(); } internal override string GetListName() { string name = GetListName(new ArrayList()); if (name.Length > 0) { return name; } return base.GetListName(); } protected internal override string GetListName(ArrayList listAccessors) { listAccessors.Insert(0, fieldInfo); return parentManager.GetListName(listAccessors); } 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); } private void ParentManager_CurrentItemChanged(object sender, EventArgs e) { Refresh(); } private void Refresh() { EndCurrentEdit(); SetDataSource(GetCurrentOrNull(parentManager)); OnCurrentChanged(EventArgs.Empty); } internal override Type BindType { get { return fieldInfo.PropertyType; } } public override object Current { get { return (this.DataSource != null) ? fieldInfo.GetValue(this.DataSource) : null; } } static private object GetCurrentOrNull(BindingManagerBase parentManager) { bool anyCurrent = (parentManager.Position >= 0 && parentManager.Position < parentManager.Count); return anyCurrent ? parentManager.Current : null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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