protected bool SetValueUncancellable <T>(ref T field, T value, Action updateAction, [ItemNotNull, NotNull] params string[] propertyNames)
{
foreach (var propertyName in propertyNames)
{
uncancellableChanges.Add(propertyName);
string[] dependentProperties;
if (DependentProperties.TryGetValue(propertyName, out dependentProperties))
{
dependentProperties.ForEach(x => uncancellableChanges.Add(x));
}
}
try
{
var result = SetValue(ref field, value, updateAction, false, propertyNames);
return(result);
}
finally
{
foreach (var propertyName in propertyNames)
{
uncancellableChanges.Remove(propertyName);
string[] dependentProperties;
if (DependentProperties.TryGetValue(propertyName, out dependentProperties))
{
dependentProperties.ForEach(x => uncancellableChanges.Remove(x));
}
}
}
}
/// <summary>
/// Manages a property modification and its notifications. A function is provided to check whether the new value is different from the current one.
/// This function will be invoked by this method, and if it returns <c>True</c>, it will invoke the provided update action. The <see cref="ViewModelBase.PropertyChanging"/>
/// event will be raised prior to the update action, and the <see cref="ViewModelBase.PropertyChanged"/> event will be raised after.
/// </summary>
/// <remarks>This method does not register <see cref="IActionItem"/> into the associated <see cref="ITransactionalActionStack"/>.</remarks>
/// <param name="hasChangedFunction">A function that check if the new value is different and therefore if the update must be actually done.</param>
/// <param name="updateAction">The update action that will actually manage the update of the property.</param>
/// <param name="propertyNames">The names of the properties that must be notified as changing/changed. At least one property name must be provided.</param>
/// <returns><c>True</c> if the update was done and events were raised, <c>False</c> if <see cref="hasChangedFunction"/> is not <c>null</c> and returned false.</returns>
protected virtual bool SetValueUncancellable(Func <bool> hasChangedFunction, Action updateAction, params string[] propertyNames)
{
foreach (var propertyName in propertyNames)
{
uncancellableChanges.Add(propertyName);
string[] dependentProperties;
if (DependentProperties.TryGetValue(propertyName, out dependentProperties))
{
dependentProperties.ForEach(x => uncancellableChanges.Add(x));
}
}
try
{
var result = SetValue(hasChangedFunction, updateAction, propertyNames);
return(result);
}
finally
{
foreach (var propertyName in propertyNames)
{
uncancellableChanges.Remove(propertyName);
string[] dependentProperties;
if (DependentProperties.TryGetValue(propertyName, out dependentProperties))
{
dependentProperties.ForEach(x => uncancellableChanges.Remove(x));
}
}
}
}
