private void TrySetupCommandRelevantProperties()
{
var classType = GetType();
if (commandRelevantProperties.Any(
relevance => relevance.Class == classType))
{
return;
}
var properties = GetPropertiesDecoratedWith <IsRelevantForCommand>(
classType);
foreach (var property in properties)
{
var attribute = property.GetCustomAttribute <IsRelevantForCommand>();
if (attribute == null)
{
continue;
}
var commandRelevance = new CommandRelevantPropertyWrapper
{
Class = classType,
PropertyName = property.Name,
CommandName = attribute.CommandName
};
commandRelevantProperties.Add(
commandRelevance);
}
}
private void UpdateCommandsCanExecute(
CommandRelevantPropertyWrapper commandRelevance)
{
if (commandRelevance == null)
{
return;
}
if (Options.UseCommandRelevanceAttribute &&
!string.IsNullOrWhiteSpace(
commandRelevance.CommandName))
{
var commandProperty = GetCommandProperties()
.FirstOrDefault(
property => property.Name == commandRelevance.CommandName);
if (commandProperty?.GetValue(this) is ICommand command)
{
InvokeCommandCanExecuteChanged(
command);
return;
}
}
foreach (var property in GetCommandProperties())
{
if (!(property.GetValue(this) is ICommand command))
{
continue;
}
InvokeCommandCanExecuteChanged(
command);
}
}