从JSON字符串列表中过滤数据

Question

我有一个像这样的json字符串列表

parent_id

现在我想得到与规则ID匹配的元素数。如何使用linq

Answer 1

执行以下操作：

 string pattern = @"<a regular expression pattern>";
 Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);
 var num = jsonList.Count(x => rgx.Matches(JObject.Parse(x)["RuleId"]).Count > 0);

或者在一个简单的案例中：

string specifiedId = "<Id>";
var num = jsonList.Count(x => JObject.Parse(x)["RuleId"] == specifiedId);

Answer 2

这是我从你的问题中理解的：在列表的元素中计算给定的id。

var ruleId = "20cf47c5-3674-4a39-8553-00348f860fe7";

var list = new List<KeyValuePair<string, string>>
{
    new KeyValuePair<string, string>("RuleId", "20cf47c5-3674-4a39-8553-00348f860fe7"),
    new KeyValuePair<string, string>("RuleId", "3047c5-3674-4a39-7753-003477860fe7"),
    new KeyValuePair<string, string>("RuleId", "20cf47c5-3674-4a39-8553-00348f860fe7"),
    new KeyValuePair<string, string>("RuleId", "55cf47c5-3674-4a39-8553-00366f860hh7")
};

var count = list.Count(x => x.Value == ruleId);