Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Data / BindingOperations.cs / 1 / BindingOperations.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Helper operations for data bindings. // // See spec at [....]/connecteddata/Specs/Data%20Binding.mht // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Diagnostics; using System.ComponentModel; using System.Globalization; using System.Threading; using System.Windows; using System.Windows.Controls; using System.Windows.Markup; using System.Windows.Threading; using MS.Internal.Data; namespace System.Windows.Data { ////// Operations to manipulate data bindings. /// public static class BindingOperations { //----------------------------------------------------- // // Public Methods // //----------------------------------------------------- ////// Attach a BindingExpression to a property. /// ////// A new BindingExpression is created from the given description, and attached to /// the given property of the given object. This method is the way to /// attach a Binding to an arbitrary DependencyObject that may not expose /// its own SetBinding method. /// /// object on which to attach the Binding /// property to which to attach the Binding /// description of the Binding ///target and dp and binding cannot be null public static BindingExpressionBase SetBinding(DependencyObject target, DependencyProperty dp, BindingBase binding) { if (target == null) throw new ArgumentNullException("target"); if (dp == null) throw new ArgumentNullException("dp"); if (binding == null) throw new ArgumentNullException("binding"); // target.VerifyAccess(); BindingExpressionBase bindExpr = binding.CreateBindingExpression(target, dp); // target.SetValue(dp, bindExpr); return bindExpr; } ////// Retrieve a BindingBase. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the binding /// property from which to retrieve the binding ///target and dp cannot be null public static BindingBase GetBindingBase(DependencyObject target, DependencyProperty dp) { BindingExpressionBase b = GetBindingExpressionBase(target, dp); return (b != null) ? b.ParentBindingBase : null; } ////// Retrieve a Binding. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the binding /// property from which to retrieve the binding ///target and dp cannot be null public static Binding GetBinding(DependencyObject target, DependencyProperty dp) { return GetBindingBase(target, dp) as Binding; } ////// Retrieve a PriorityBinding. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the binding /// property from which to retrieve the binding ///target and dp cannot be null public static PriorityBinding GetPriorityBinding(DependencyObject target, DependencyProperty dp) { return GetBindingBase(target, dp) as PriorityBinding; } ////// Retrieve a MultiBinding. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the binding /// property from which to retrieve the binding ///target and dp cannot be null public static MultiBinding GetMultiBinding(DependencyObject target, DependencyProperty dp) { return GetBindingBase(target, dp) as MultiBinding; } ////// Retrieve a BindingExpressionBase. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the BindingExpression /// property from which to retrieve the BindingExpression ///target and dp cannot be null public static BindingExpressionBase GetBindingExpressionBase(DependencyObject target, DependencyProperty dp) { if (target == null) throw new ArgumentNullException("target"); if (dp == null) throw new ArgumentNullException("dp"); // target.VerifyAccess(); Expression expr = StyleHelper.GetExpression(target, dp); return expr as BindingExpressionBase; } ////// Retrieve a BindingExpression. /// ////// This method returns null if no Binding has been set on the given /// property. /// /// object from which to retrieve the BindingExpression /// property from which to retrieve the BindingExpression ///target and dp cannot be null public static BindingExpression GetBindingExpression(DependencyObject target, DependencyProperty dp) { BindingExpressionBase expr = GetBindingExpressionBase(target, dp); PriorityBindingExpression pb = expr as PriorityBindingExpression; if (pb != null) expr = pb.ActiveBindingExpression; return expr as BindingExpression; } ////// Retrieve a MultiBindingExpression. /// ////// This method returns null if no MultiBinding has been set on the given /// property. /// /// object from which to retrieve the MultiBindingExpression /// property from which to retrieve the MultiBindingExpression ///target and dp cannot be null public static MultiBindingExpression GetMultiBindingExpression(DependencyObject target, DependencyProperty dp) { return GetBindingExpressionBase(target, dp) as MultiBindingExpression; } ////// Retrieve a PriorityBindingExpression. /// ////// This method returns null if no PriorityBinding has been set on the given /// property. /// /// object from which to retrieve the PriorityBindingExpression /// property from which to retrieve the PriorityBindingExpression ///target and dp cannot be null public static PriorityBindingExpression GetPriorityBindingExpression(DependencyObject target, DependencyProperty dp) { return GetBindingExpressionBase(target, dp) as PriorityBindingExpression; } ////// Remove data Binding (if any) from a property. /// ////// If the given property is data-bound, via a Binding, PriorityBinding or MultiBinding, /// the BindingExpression is removed, and the property's value changes to what it /// would be as if no local value had ever been set. /// If the given property is not data-bound, this method has no effect. /// /// object from which to remove Binding /// property from which to remove Binding ///target and dp cannot be null public static void ClearBinding(DependencyObject target, DependencyProperty dp) { if (target == null) throw new ArgumentNullException("target"); if (dp == null) throw new ArgumentNullException("dp"); // target.VerifyAccess(); if (IsDataBound(target, dp)) target.ClearValue(dp); } ////// Remove all data Binding (if any) from a DependencyObject. /// /// object from which to remove bindings ///DependencyObject target cannot be null public static void ClearAllBindings(DependencyObject target) { if (target == null) throw new ArgumentNullException("target"); // target.VerifyAccess(); LocalValueEnumerator lve = target.GetLocalValueEnumerator(); // Batch properties that have BindingExpressions since clearing // during a local value enumeration is illegal ArrayList batch = new ArrayList(8); while (lve.MoveNext()) { LocalValueEntry entry = lve.Current; if (IsDataBound(target, entry.Property)) { batch.Add(entry.Property); } } // Clear all properties that are storing BindingExpressions for (int i = 0; i < batch.Count; i++) { target.ClearValue((DependencyProperty)batch[i]); } } ///Return true if the property is currently data-bound ///DependencyObject target cannot be null public static bool IsDataBound(DependencyObject target, DependencyProperty dp) { if (target == null) throw new ArgumentNullException("target"); // target.VerifyAccess(); object o = StyleHelper.GetExpression(target, dp); return (o is BindingExpressionBase); } //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- // return false if this is an invalid value for UpdateSourceTrigger internal static bool IsValidUpdateSourceTrigger(UpdateSourceTrigger value) { switch (value) { case UpdateSourceTrigger.Default: case UpdateSourceTrigger.PropertyChanged: case UpdateSourceTrigger.LostFocus: case UpdateSourceTrigger.Explicit: return true; default: return false; } } // The following properties and methods have no internal callers. They // can be called by suitably privileged external callers via reflection. // They are intended to be used by test programs and the DRT. // Enable or disable the cleanup pass. For use by tests that measure // perf, to avoid noise from the cleanup pass. internal static bool IsCleanupEnabled { get { return DataBindEngine.CurrentDataBindEngine.CleanupEnabled; } set { DataBindEngine.CurrentDataBindEngine.CleanupEnabled = value; } } // Force a cleanup pass (even if IsCleanupEnabled is true). For use // by leak-detection tests, to avoid false leak reports about objects // held by the DataBindEngine that can be cleaned up. Returns true // if something was actually cleaned up. internal static bool Cleanup() { return DataBindEngine.CurrentDataBindEngine.Cleanup(); } // Print various interesting statistics internal static void PrintStats() { DataBindEngine.CurrentDataBindEngine.AccessorTable.PrintStats(); } // Trace the size of the accessor table after each generation internal static bool TraceAccessorTableSize { get { return DataBindEngine.CurrentDataBindEngine.AccessorTable.TraceSize; } set { DataBindEngine.CurrentDataBindEngine.AccessorTable.TraceSize = value; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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