protected override Expression VisitMemberAccess(MemberExpression m)
{
Visit(m.Expression);
PropertyType = m.Type;
// try to get the value
try
{
var rootInstance = Expression.Lambda(typeof(Func <object>), m.Expression).Compile().DynamicInvoke();
if (rootInstance != null)
{
{
var pi = m.Member as PropertyInfo;
object resultingInstance = null;
if (pi != null)
{
resultingInstance = pi.GetValue(rootInstance, null);
}
var fi = m.Member as FieldInfo;
if (fi != null)
{
resultingInstance = fi.GetValue(rootInstance);
}
if (resultingInstance != null)
{
var propertyPath = ObjectPaths.Get(resultingInstance);
if (propertyPath != null)
{
RootType = propertyPath.TypePrefix;
AppendPropertyPath(propertyPath.TypeSuffix);
return(m);
}
}
}
}
}
catch
{
}
if (RootType == null)
{
RootType = ExtractType(m.Member).GetTypeString();
}
else
{
var name = m.Member.Name;
AppendPropertyPath(name);
}
return(m);
}
public static IEnumerable <TResult> SelectHtml <TSource, TResult>(this IEnumerable <TSource> source,
object rootInstance,
PropertyPath path,
Func <TSource, TResult> selector)
{
if (source == null)
{
yield break;
}
int index = 0;
foreach (var item in source)
{
try
{
PropertyPath pathToAdd;
if (rootInstance != null)
{
PropertyPath rootPath = ObjectPaths.Get(rootInstance);
pathToAdd = new PropertyPath
{
TypePrefix = rootPath.TypePrefix,
TypeSuffix = rootPath.TypeSuffix + "." + path.TypeSuffix + ":" + index
};
}
else
{
pathToAdd = new PropertyPath
{
TypePrefix = path.TypePrefix,
TypeSuffix = path.TypeSuffix + ":" + index
};
}
ObjectPaths.Add(item, pathToAdd);
yield return(selector(item));
}
finally
{
ObjectPaths.Remove(item);
index++;
}
}
}