private SortField CreateSortFieldFromExpr(MethodCallExpression node, bool reverse)
{
string name;
var unaryExpr = node.Arguments[1] as UnaryExpression;
if (unaryExpr == null)
{
throw new Exception("Invalid sort: " + node.ToString());
}
var operand = unaryExpr.Operand as LambdaExpression;
if (operand == null)
{
throw new Exception("Invalid sort: " + node.ToString());
}
var memberExpr = operand.Body as MemberExpression;
if (memberExpr != null)
{
name = memberExpr.Member.Name;
return(LucQuery.CreateSortField(name, reverse));
}
var methodCallExpr = operand.Body as MethodCallExpression;
if (methodCallExpr == null)
{
throw new Exception("Invalid sort: " + node.ToString());
}
if (methodCallExpr.Method.Name != "get_Item")
{
throw new Exception("Invalid sort: " + node.ToString());
}
if (methodCallExpr.Arguments.Count != 1)
{
throw new Exception("Invalid sort: " + node.ToString());
}
var nameExpr = methodCallExpr.Arguments[0] as ConstantExpression;
if (nameExpr == null)
{
throw new Exception("Invalid sort: " + node.ToString());
}
name = (string)nameExpr.Value;
return(LucQuery.CreateSortField(name, reverse));
}
