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 Expression Find(Expression expression, IList <ParameterExpression> parameters, Type type)
{
if (parameters != null)
{
Expression found = parameters.FirstOrDefault(p => type.IsAssignableFrom(p.Type));
if (found != null)
{
return(found);
}
}
return(TypedSubtreeFinder.Find(expression, type));
}
private Expression Find(Expression expression, IList <ParameterExpression> parameters, Type type)
{
Func <ParameterExpression, bool> predicate = null;
if (parameters != null)
{
if (predicate == null)
{
predicate = p => type.IsAssignableFrom(p.Type);
}
Expression expression2 = parameters.FirstOrDefault <ParameterExpression>(predicate);
if (expression2 != null)
{
return(expression2);
}
}
return(TypedSubtreeFinder.Find(expression, type));
}
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);
}
private Expression Find(Expression expression, IList <ParameterExpression> parameters)
{
return(TypedSubtreeFinder.Find(expression, this.GetType()));
}
private static bool ContainsOrEquals(Expression expression, Expression searchFor)
{
return(expression == searchFor || TypedSubtreeFinder.Find(expression, searchFor.Type) == searchFor);
}
