指数超出范围。 必须是非负数且小于集合的大小。 (参数‘索引’)"

Question

我的 c# 控制台应用程序中有以下类：-

public class SearchCriteria
    {
        public string field { get; set; }
        public string condition { get; set; }
        public string value { get; set; }
        public string logical_operator { get; set; }
    }

    public class ListInfo
    {
        public int row_count { get; set; }
        public int start_index { get; set; }
        public string sort_field { get; set; }
        public string sort_order { get; set; }
        public bool get_total_count { get; set; }
        public List<SearchCriteria> search_criteria { get; set; }
    }

    public class Root
    {
        public ListInfo list_info { get; set; }
    }

当我尝试填充根 object 时，如下所示：-

                        Root root = new Root(){};
                        root.list_info = new ListInfo();
                        root.list_info.row_count = 1000;
                        root.list_info.start_index = 1;
                        root.list_info.sort_field="subject";
                        root.list_info.sort_order = "asc";
                        root.list_info.get_total_count = true;
                        root.list_info.search_criteria = new List<SearchCriteria>();
                        root.list_info.search_criteria[0].field = "last_updated_time";
                        root.list_info.search_criteria[0].condition = "between";
                        root.list_info.search_criteria[0].value = "$(last_30_days)";

                        root.list_info.search_criteria[1].field = config.GetSection("ServiceDesk").GetSection("field").Value;
                        root.list_info.search_criteria[1].condition = "is";
                        root.list_info.search_criteria[1].value = "yes";
                        root.list_info.search_criteria[1].logical_operator = "AND";

我收到了这个错误：-

Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')"

在root.list_info.search_criteria[0].field = "last_updated_time"; ..有什么建议吗？

Answer 1

您的 root.list_info.search_criteria仍然为空，因此此列表中没有项目。 你只应该做

root.list_info.search_criteria.Add(new SearchCriteria());

然后它将起作用。