[英]how do I extract a specific substring from a string in c# using a loop?
我试图从我从Web服务器得到的响应中仅提取路由号。 响应看起来像这样;
[{“ Description”:“ METRO Blue Line”,“ ProviderID”:“ 8”,“ Route”:“ 901”},{“ Description”:“ METRO Green Line”,“ ProviderID”:“ 8”,“ Route “:” 902“},
我所需要的只是获取路由号,以便我用它们填充组合框。 我正在尝试使用循环,因为有很多循环。 我当前的解决方案获得了第一个路由号,但是由于某种原因,我仅获得了之后的提供商号,这就是我到目前为止的结果。
//get bus routes and popluate the busRoutecmb
restClient.endPoint = routeUrl + formatLine;
string response = restClient.request();
//show me what was returned for debug puposes
System.Diagnostics.Debug.Write(response);
//sort through data and put relevent item in a list
List<string> responseItems = new List<string>();
//splitting into routes
string[] splitByRoute = response.Split('}');
//extracting route number from elements in splitByRoute
List<string> extractedRouteNums = new List<string>();
foreach (string thing in splitByRoute)
{
//splitting each bus route up by piece of information
string[] splitByWord = thing.Split(',');
//getting rid of everything but the route number
int length = splitByWord.Length;
int count = 2;
while (count <= length)
{
string[] word = splitByWord[count].Split(':');
string routeNum = word[1].Trim('"');
count += 3;
extractedRouteNums.Add(routeNum);
System.Diagnostics.Debug.WriteLine(count);
System.Diagnostics.Debug.WriteLine(routeNum);
}
}
//add repsonse to busRoutecmb
busRoutecmb.DataSource = extractedRouteNums;
}
您得到的基本上是一个JSON字符串,它只是一个名称值对数组或一个Dictionary List。
[{
"Description": "METRO Blue Line",
"ProviderID": "8",
"Route": "901"
},
{
"Description": "METRO Green Line",
"ProviderID": "8",
"Route": "902"
}]
您可以通过几种方式将该字符串反序列化为List,一种是使用System.Web.Script.Serialization.JavaScriptSerializer或JSON.NET。 进入列表后,您可以查询该列表并仅返回路由键,值对。
var data = "[{ Description:\"METROBlueLine\",ProviderID:\"8\",Route:\"901\"},{Description:\"METRO Green Line\",ProviderID:\"8\",Route:\"902\"}]";
var ser = new System.Web.Script.Serialization.JavaScriptSerializer();
var mylist = ser.Deserialize<List<Dictionary<string,string>>>(data);
//or JSON.net
var mylist = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
var routes = mylist.SelectMany(a => a).Where(c => c.Key == "Route").ToList();
foreach (var route in routes)
Console.Write(route);
output
[Route, 901][Route, 902]
如果您真的只想要这些值,那么
var routesonly = routes.Select(r => r.Value).ToList();
Gratzy认为这是JSON是正确的,但我建议您使用JSON.NET对其进行反序列化。
var items = JsonConvert.DeserializeObject<JArray>(response);
var routeNumbers = items.Select(i => i.Value<string>("Route")).ToList();
您还可以使用http://json2csharp.com/生成一个强类型模型,并根据需要反序列化为该模型类型。
public class RootObject
{
public string Description { get; set; }
public string ProviderID { get; set; }
public string Route { get; set; }
}
var items = JsonConvert.DeserializeObject<RootObject[]>(response);
var routeNumbers = items.Select(i => i.Route).ToList();
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