Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Data / BindingOperations.cs / 1305600 / BindingOperations.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description: Helper operations for data bindings.
//
// See spec at http://avalon/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");
if (dp == null)
throw new ArgumentNullException("dp");
// 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.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description: Helper operations for data bindings.
//
// See spec at http://avalon/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");
if (dp == null)
throw new ArgumentNullException("dp");
// 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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