public static Expression Find(Expression expression, Type type)
{
TypedSubtreeFinder finder = new TypedSubtreeFinder(type);
finder.Visit(expression);
return(finder.root);
}
private Expression FindProviderInExpression(Expression expression)
{
Expression root = TypedSubtreeFinder.Find(expression, typeof(IQueryProvider));
if (root == null)
{
root = TypedSubtreeFinder.Find(expression, typeof(IQueryable));
}
return(root);
}
private IQueryProvider FindProvider(Expression expression)
{
ConstantExpression root = TypedSubtreeFinder.Find(expression, typeof(IQueryProvider)) as ConstantExpression;
if (root == null)
{
root = TypedSubtreeFinder.Find(expression, typeof(IQueryable)) as ConstantExpression;
}
if (root != null)
{
IQueryProvider provider = root.Value as IQueryProvider;
if (provider == null)
{
IQueryable query = root.Value as IQueryable;
if (query != null)
{
provider = query.Provider;
}
}
return(provider);
}
return(null);
}