Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / BindToObject.cs / 3 / BindToObject.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using Microsoft.Win32; using System.Diagnostics; using System.ComponentModel; using System.ComponentModel.Design; using System.Collections; internal class BindToObject { private PropertyDescriptor fieldInfo; private BindingMemberInfo dataMember; private Object dataSource; private BindingManagerBase bindingManager; private Binding owner; private string errorText = string.Empty; private bool dataSourceInitialized = false; private bool waitingOnDataSource = false; private void PropValueChanged(object sender, EventArgs e) { if(this.bindingManager != null) { this.bindingManager.OnCurrentChanged(EventArgs.Empty); } } private bool IsDataSourceInitialized { get { Debug.Assert(this.dataSource != null, "how can we determine if DataSource is initialized or not if we have no data source?"); if (this.dataSourceInitialized) { return true; } ISupportInitializeNotification ds = this.dataSource as ISupportInitializeNotification; if (ds == null || ds.IsInitialized) { this.dataSourceInitialized = true; return true; } // We have an ISupportInitializeNotification which was not initialized yet. // We already hooked up the Initialized event and the data source is not initialized yet. if (this.waitingOnDataSource) { return false; } // Hook up the Initialized event. ds.Initialized += new EventHandler(DataSource_Initialized); this.waitingOnDataSource = true; return false; } } internal BindToObject(Binding owner, Object dataSource, string dataMember) { this.owner = owner; this.dataSource = dataSource; this.dataMember = new BindingMemberInfo(dataMember); CheckBinding(); } private void DataSource_Initialized(object sender, EventArgs e) { Debug.Assert(sender == this.dataSource, "data source should not change"); Debug.Assert(this.dataSource is ISupportInitializeNotification, "data source should not change on the BindToObject"); Debug.Assert(this.waitingOnDataSource); ISupportInitializeNotification ds = this.dataSource as ISupportInitializeNotification; // Unhook the Initialized event. if (ds != null) { ds.Initialized -= new EventHandler(DataSource_Initialized); } // The wait is over: DataSource is initialized. this.waitingOnDataSource = false; this.dataSourceInitialized = true; // Rebind. CheckBinding(); } internal void SetBindingManagerBase(BindingManagerBase lManager) { if (bindingManager == lManager) { return; } // remove notification from the backEnd if (bindingManager != null && fieldInfo != null && bindingManager.IsBinding && !(bindingManager is CurrencyManager)) { fieldInfo.RemoveValueChanged(bindingManager.Current, new EventHandler(PropValueChanged)); fieldInfo = null; } this.bindingManager = lManager; CheckBinding(); } internal string DataErrorText { get { return this.errorText; } } // Returns any data error info on the data source for the bound data field in the current row string GetErrorText(object value) { IDataErrorInfo errorInfo = value as IDataErrorInfo; string text = string.Empty; if (errorInfo != null) { // Get the row error if there is no DataMember if (fieldInfo == null) { text = errorInfo.Error; } // Get the column error if there is a DataMember. // The DataTable uses its own Locale to lookup column names. // So passing the DataMember from the BindingField could cause problems. // Pass the name from the PropertyDescriptor that the DataTable gave us. // (If there is no fieldInfo, data binding would have failed already ) else { text = errorInfo[fieldInfo.Name]; } } return text ?? string.Empty; } internal Object GetValue() { object obj = bindingManager.Current; // Update IDataErrorInfo text: it's ok to get this now because we're going to need // this as part of the BindingCompleteEventArgs anyway. this.errorText = GetErrorText(obj); if (fieldInfo != null) { obj = fieldInfo.GetValue(obj); } return obj; } internal Type BindToType { get { if (dataMember.BindingField.Length == 0) { // if we are bound to a list w/o any properties, then // take the type from the BindingManager Type type = this.bindingManager.BindType; if (typeof(Array).IsAssignableFrom(type)) type = type.GetElementType(); return type; } else return fieldInfo == null ? null : fieldInfo.PropertyType; } } internal void SetValue(Object value) { object obj = null; if (fieldInfo != null) { obj = bindingManager.Current; if (obj is IEditableObject) ((IEditableObject) obj).BeginEdit(); //(bug 112947) .. checkif the Column is readonly while pushing data... if (!fieldInfo.IsReadOnly) { fieldInfo.SetValue(obj, value); } } else { CurrencyManager cm = bindingManager as CurrencyManager; if (cm != null) { cm[cm.Position] = value; obj = value; } } // Update IDataErrorInfo text. this.errorText = GetErrorText(obj); } internal BindingMemberInfo BindingMemberInfo { get { return this.dataMember; } } internal Object DataSource { get { return dataSource; } } internal PropertyDescriptor FieldInfo { get { return fieldInfo; } } internal BindingManagerBase BindingManagerBase { get { return this.bindingManager; } } internal void CheckBinding() { // At design time, don't check anything. // if (owner != null && owner.BindableComponent != null && owner.ControlAtDesignTime()) { return; } // force Column to throw if it's currently a bad column. //DataColumn tempColumn = this.Column; // remove propertyChangedNotification when this binding is deleted if (this.owner.BindingManagerBase != null && this.fieldInfo != null && this.owner.BindingManagerBase.IsBinding && !(this.owner.BindingManagerBase is CurrencyManager)) { fieldInfo.RemoveValueChanged(owner.BindingManagerBase.Current, new EventHandler(PropValueChanged)); } if (owner != null && owner.BindingManagerBase != null && owner.BindableComponent != null && owner.ComponentCreated && this.IsDataSourceInitialized) { string dataField = dataMember.BindingField; fieldInfo = owner.BindingManagerBase.GetItemProperties().Find(dataField, true); if (owner.BindingManagerBase.DataSource != null && fieldInfo == null && dataField.Length > 0) { throw new ArgumentException(SR.GetString(SR.ListBindingBindField, dataField), "dataMember"); } // Do not add propertyChange notification if // the fieldInfo is null // // we add an event handler to the dataSource in the BindingManagerBase because // if the binding is of the form (Control, ControlProperty, DataSource, Property1.Property2.Property3) // then we want to get notification from Current.Property1.Property2 and not from DataSource // when we get the backEnd notification we push the new value into the Control's property // if (fieldInfo != null && owner.BindingManagerBase.IsBinding && !(this.owner.BindingManagerBase is CurrencyManager)) { fieldInfo.AddValueChanged(this.owner.BindingManagerBase.Current, new EventHandler(PropValueChanged)); } } else { fieldInfo = null; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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