/// <summary>Returns the <see cref="T:System.Windows.Data.BindingExpression" /> object associated with the specified binding target property on the specified object.</summary>
/// <param name="target">The binding target object where <paramref name="dp" /> is.</param>
/// <param name="dp">The binding target property from which to retrieve the <see cref="T:System.Windows.Data.BindingExpression" /> object.</param>
/// <returns>The <see cref="T:System.Windows.Data.BindingExpression" /> object associated with the given property or <see langword="null" /> if none exists. If a <see cref="T:System.Windows.Data.PriorityBindingExpression" /> object is set on the property, the <see cref="P:System.Windows.Data.PriorityBindingExpression.ActiveBindingExpression" /> is returned.</returns>
/// <exception cref="T:System.ArgumentNullException">The <paramref name="target" /> and <paramref name="dp" /> parameters cannot be <see langword="null" />.</exception>
// Token: 0x06001A30 RID: 6704 RVA: 0x0007D164 File Offset: 0x0007B364
public static BindingExpression GetBindingExpression(DependencyObject target, DependencyProperty dp)
{
BindingExpressionBase bindingExpressionBase = BindingOperations.GetBindingExpressionBase(target, dp);
PriorityBindingExpression priorityBindingExpression = bindingExpressionBase as PriorityBindingExpression;
if (priorityBindingExpression != null)
{
bindingExpressionBase = priorityBindingExpression.ActiveBindingExpression;
}
return(bindingExpressionBase as BindingExpression);
}
/// <summary>
/// Retrieve a BindingExpression.
/// </summary>
/// <remarks>
/// This method returns null if no Binding has been set on the given
/// property.
/// </remarks>
/// <param name="target">object from which to retrieve the BindingExpression</param>
/// <param name="dp">property from which to retrieve the BindingExpression</param>
/// <exception cref="ArgumentNullException"> target and dp cannot be null </exception>
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);
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
// Create a new BindingExpression from the given Binding description
internal static PriorityBindingExpression CreateBindingExpression(DependencyObject d, DependencyProperty dp, PriorityBinding binding, BindingExpressionBase owner)
{
FrameworkPropertyMetadata fwMetaData = dp.GetMetadata(d.DependencyObjectType) as FrameworkPropertyMetadata;
if ((fwMetaData != null && !fwMetaData.IsDataBindingAllowed) || dp.ReadOnly)
{
throw new ArgumentException(SR.Get(SRID.PropertyNotBindable, dp.Name), "dp");
}
// create the BindingExpression
PriorityBindingExpression bindExpr = new PriorityBindingExpression(binding, owner);
return(bindExpr);
}
//------------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
/// <summary>
/// Create an appropriate expression for this Binding, to be attached
/// to the given DependencyProperty on the given DependencyObject.
/// </summary>
internal override BindingExpressionBase CreateBindingExpressionOverride(DependencyObject target, DependencyProperty dp, BindingExpressionBase owner)
{
return(PriorityBindingExpression.CreateBindingExpression(target, dp, this, owner));
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
// Create a new BindingExpression from the given Binding description
internal static PriorityBindingExpression CreateBindingExpression(DependencyObject d, DependencyProperty dp, PriorityBinding binding, BindingExpressionBase owner)
{
FrameworkPropertyMetadata fwMetaData = dp.GetMetadata(d.DependencyObjectType) as FrameworkPropertyMetadata;
if ((fwMetaData != null && !fwMetaData.IsDataBindingAllowed) || dp.ReadOnly)
throw new ArgumentException(SR.Get(SRID.PropertyNotBindable, dp.Name), "dp");
// create the BindingExpression
PriorityBindingExpression bindExpr = new PriorityBindingExpression(binding, owner);
return bindExpr;
}
