protected override Expression VisitLambda <T>(Expression <T> node)
{
if (parameters == null || parameters.Count == 0)
{
return(new ObservableLambdaExpression <T>(node));
}
var parameterMappings = new Dictionary <string, object>(this.parameters);
foreach (var par in node.Parameters)
{
parameterMappings.Remove(par.Name);
}
var visitor = new ApplyParametersVisitor(parameterMappings);
var applied = visitor.Visit(node);
return(new ObservableLambdaExpression <T>((Expression <T>)applied));
}
public INotifyExpression <T> CreateExpression <T>(Expression expression, IEnumerable <ParameterExpression> parameters, IDictionary <string, object> parameterMappings)
{
if (parameterMappings != null)
{
var applyParameters = new ApplyParametersVisitor(parameterMappings);
expression = applyParameters.Visit(expression);
}
if (parameters == null || (parameterMappings == null ? !parameters.Any() : parameters.Count() == parameterMappings.Count))
{
var lambda = Expression.Lambda <Func <T> >(expression);
return(new RepositoryAffectedNotifyValue <T>(Repository, lambda.Compile()));
}
else
{
return(new RepositoryAffectedNotifyFunc <T>(Repository, expression, parameters));
}
}
public INotifyReversableExpression <T> CreateReversableExpression <T>(Expression expression, IEnumerable <ParameterExpression> parameters, IDictionary <string, object> parameterMappings)
{
if (parameterMappings != null)
{
var applyParameters = new ApplyParametersVisitor(parameterMappings);
expression = applyParameters.Visit(expression);
}
if (parameters == null || (parameterMappings == null ? !parameters.Any() : parameters.Count() == parameterMappings.Count))
{
var lambda = Expression.Lambda <Func <T> >(expression);
var setter = SetExpressionRewriter.CreateSetter(lambda);
if (setter == null)
{
throw new InvalidOperationException(string.Format("The lambda expression {0} could not be reversed.", expression));
}
return(new RepositoryAffectedReversableNotifyValue <T>(Repository, lambda.Compile(), setter.Compile()));
}
else
{
return(new RepositoryAffectedReversableNotifyFunc <T>(Repository, expression, parameters));
}
}