Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WinForms / System / WinForms / Design / BindingSourceDesigner.cs / 1 / BindingSourceDesigner.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Design.BindingSourceDesigner..ctor()")] namespace System.Windows.Forms.Design { using System; using System.Design; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.ComponentModel.Design.Data; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Windows.Forms; using System.Windows.Forms.Design.Behavior; using System.Reflection; ////// /// Designer for the BindingSource class. /// internal class BindingSourceDesigner : ComponentDesigner { private bool bindingUpdatedByUser = false; ////// Flag set by UITypeEditors to notify us when the BindingSource binding has been /// manually changed by the user (ie. DataSource or DataMember value was edited). /// /// In response to this action, we will send a notification to the DataSourceProviderService /// once the corresponding ComponentChanged event comes through (indicating that the new /// binding has actually taken effect). /// /// This notification will cause the DataSourceProviderService to re-examine the data source /// that the BindingSource is now bound to, so it can generate any table adapters or fill /// statements necessary to properly set up that data source. /// /// This serves the scenario of an advanced user configuring a BindingSource manually. In /// normal user scenarios, BindingSources get auto-generated as a result of various drag/drop /// operations, and in those scenarios the above notification is sent automatically. /// /// VSWhidbey#256272 /// public bool BindingUpdatedByUser { set { bindingUpdatedByUser = value; } } ////// Initialize this designer. /// public override void Initialize(IComponent component) { base.Initialize(component); IComponentChangeService componentChangeSvc = (IComponentChangeService) GetService(typeof(IComponentChangeService)); if (componentChangeSvc != null) { componentChangeSvc.ComponentChanged += new ComponentChangedEventHandler(OnComponentChanged); componentChangeSvc.ComponentRemoving+= new ComponentEventHandler(OnComponentRemoving); } } ////// Dispose this designer. /// protected override void Dispose(bool disposing) { if (disposing) { IComponentChangeService componentChangeSvc = (IComponentChangeService) GetService(typeof(IComponentChangeService)); if (componentChangeSvc != null) { componentChangeSvc.ComponentChanged -= new ComponentChangedEventHandler(OnComponentChanged); componentChangeSvc.ComponentRemoving-= new ComponentEventHandler(OnComponentRemoving); } } base.Dispose(disposing); } ////// Spot when a change to the BindingSource's DataSource or DataMember is made by the user, and notify the /// DataSourceProviderService accordingly. See description of BindingUpdatedByUser property for full details. /// private void OnComponentChanged(object sender, ComponentChangedEventArgs e) { if (bindingUpdatedByUser && e.Component == this.Component && e.Member != null && (e.Member.Name == "DataSource" || e.Member.Name == "DataMember")) { bindingUpdatedByUser = false; DataSourceProviderService dspSvc = (DataSourceProviderService) GetService(typeof(DataSourceProviderService)); if (dspSvc != null) { dspSvc.NotifyDataSourceComponentAdded(Component); } } } private void OnComponentRemoving(object sender, ComponentEventArgs e) { BindingSource b = this.Component as BindingSource; if (b != null && b.DataSource == e.Component) { IComponentChangeService ccs = (IComponentChangeService) GetService(typeof(IComponentChangeService)); string previousDataMember = b.DataMember; PropertyDescriptorCollection props = TypeDescriptor.GetProperties(b); PropertyDescriptor dmPD = props != null ? props["DataMember"] : null; if (ccs != null) { if (dmPD != null) { ccs.OnComponentChanging(b, dmPD); } } b.DataSource = null; if (ccs != null) { if (dmPD != null) { ccs.OnComponentChanged(b, dmPD, previousDataMember, ""); } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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