/// <summary>
/// This turn a call to TryGetParemeter('item') where item is a local variable
/// into a WrapIfNull(item) method call.
/// </summary>
/// <param name="node">The node.</param>
public override void OnMethodInvocationExpression(MethodInvocationExpression node)
{
var expression = node.Target as ReferenceExpression;
if (expression == null || expression.Name != "TryGetParameter")
{
base.OnMethodInvocationExpression(node);
return;
}
var name = ((StringLiteralExpression)node.Arguments[0]).Value;
var entity = NameResolutionService.Resolve(name);
if (entity == null)
{
base.OnMethodInvocationExpression(node);
return;
}
var parentNode = node.ParentNode;
var mie = CodeBuilder.CreateMethodInvocation(
CodeBuilder.CreateSelfReference(_currentMethod.DeclaringType),
wrapNullValue);
var item = new ReferenceExpression(node.LexicalInfo, name);
TypeSystemServices.Bind(item, entity);
mie.Arguments.Add(item);
parentNode.Replace(node, mie);
}