【发布时间】：2020-05-16 07:50:00
【问题描述】：
我的 Json 响应如下：
{"d":
{"RowData":
[{"GenreId":11,"GenreName":"Musical","subjecturl":"subjecturl_1","logourl":"logourl_1"},
{"GenreId":12,"GenreName":"kids","subjecturl":"subjecturl_2","logourl":"logourl_2"},
{"GenreId":13,"GenreName":"other","subjecturl":"subjecturl_3","logourl":"logourl_3"},
{"GenreId":14,"GenreName":"Musical","subjecturl":"subjecturl_4","logourl":"logourl_4"},
{"GenreId":15,"GenreName":"Music","subjecturl":"subjecturl_5","logourl":"logourl_5"},
{"GenreId":16,"GenreName":"Faimaly","subjecturl":"subjecturl_6","logourl":"logourl_6"},
{"GenreId":17,"GenreName":"other","subjecturl":"subjecturl_7","logourl":"logourl_7"},
{"GenreId":18,"GenreName":"other","subjecturl":"subjecturl_8","logourl":"logourl_8"},
{"GenreId":19,"GenreName":"kids","subjecturl":"subjecturl_9","logourl":"logourl_9"},
{"GenreId":20,"GenreName":"Musical","subjecturl":"subjecturl_10","logourl":"logourl_10"},
{"GenreId":21,"GenreName":"other","subjecturl":"subjecturl_11","logourl":"logourl_11"}]}}
使用上面的响应，我尝试做出如下响应：
{"rows": [{
"title": "Musical",
"items": [{"hdsubjecturl": "subjecturl_1"},{"hdsubjecturl": "subjecturl_4"},{"hdsubjecturl": "subjecturl_10"}]
},{
"title": "kids",
"items": [{"hdsubjecturl": "subjecturl_2"},{"hdsubjecturl": "subjecturl_9"}]
},{
"title": "Music",
"items": [{"hdsubjecturl": "subjecturl_5"}]
},{
"title": "other",
"items": [{"hdsubjecturl": "subjecturl_3"},{"hdsubjecturl": "subjecturl_7"},{"hdsubjecturl": "subjecturl_8"},{"hdsubjecturl": "subjecturl_11"}]
},{
"title": "Faimaly",
"items": [{"hdsubjecturl": "subjecturl_6"}]
}]
}
我的代码如下：
JObject Root = JObject.Parse(jsonData["d"].ToString());
var unique = Root["RowData"].GroupBy(x => x["GenreName"]).Select(x => x.First()).ToList(); // here fetch 5 record
foreach (var un in unique)
{
var GenreName = new
{
title = un["GenreName"],
items = new
{
hdsubjecturl = "logourl"
}
};
var GenreNamereq = JsonConvert.SerializeObject(GenreName, Newtonsoft.Json.Formatting.Indented);
genstr.Append(GenreNamereq, 0, GenreNamereq.Length);
genstr.Append(",");
using (System.IO.StreamWriter file = new System.IO.StreamWriter(subdir + "\\GenreName.json"))
{
string st = genstr.ToString().Substring(0, (genstr.Length - 1));
file.WriteLine("{\n\"rows\": [\n" + st + "\n}"); //seasion number 21 terminate
file.Close();
}
}
使用上面的代码，我的第一个字段的输出如下：
{"rows":
[{
"title": "Musical",
"items": {
"hdsubjecturl": "logourl"
}
}]
}
使用下面的代码，我尝试使用特定字段获取多个值：
List<string> CategoryList = new List<string>();
var unique = Root["RowData"].GroupBy(x => x["GenreName"]).Select(x => x.First()).ToList(); // here fetch 8 record
foreach (var cat in unique)
{
CategoryList.Add(cat["GenreName"].ToString());
}
List<List<string>> myList = new List<List<string>>();
for (int i=0;i<CategoryList.Count();i++)
{
var results = from x in Root["RowData"]
where x["GenreName"].Value<string>() == CategoryList[i]
select x;
foreach (var token in results)
{
Console.WriteLine(token["logourl"]);
}
// myList.Add(results);
}
在第一个代码中，我使用 JObject 来获取根节点。但是，使用上面的查询，默认情况下需要 JTocken。所以，我在这里使用了 foreach 循环。 我使用Dictionary instances 创建 JSON。使用此代码，我成功地在 for 循环中获取了 hdsubjecturl。但是，我不知道如何在 Dictionary 实例中放置多个值。因为我使用唯一查询仅获得一次标题字段，而 hdsubjetcurl 中的项目字段不止一个。有谁知道这怎么可能？
【问题讨论】：
标签： c# json linq dictionary