Question

我是编程新手，我尝试在C＃控制台应用程序中创建交换办公室。我使用免费的API服务获取当前货币汇率。通过这种方式，我可以读取所有API元素，但是我不知道如何获取所需的元素？例如，我需要采取USDEUR汇率。该怎么做？

我的代码是

string url = @"http://apilayer.net/api/live? access_key=8efc5a54419e913b695f694bbef4d97f& currencies = EUR,GBP,CAD,PLN& source = USD& format = 1";
        string objects = new WebClient().DownloadString(url);

        var lista = JsonConvert.SerializeObject(objects, Formatting.Indented);

        var finish = lista.ToArray();

        Console.WriteLine(finish);

Answer 1

您需要让 JSON 字符串成为对象。

有两种方法可以制作

使用JsonConvert.DeserializeObject方法获取模型。

制作一个model

public class Quotes
{
    public double USDAED { get; set; }
    public double USDAFN { get; set; }
    public double USDALL { get; set; }
    public double USDAMD { get; set; }
    public double USDANG { get; set; }
    public double USDAOA { get; set; }
    public double USDARS { get; set; }
    public double USDAUD { get; set; }
    public double USDAWG { get; set; }
    public double USDAZN { get; set; }
    public double USDBAM { get; set; }
    public int USDBBD { get; set; }
    public double USDBDT { get; set; }
    public double USDBGN { get; set; }
    public double USDBHD { get; set; }
    public double USDBIF { get; set; }
    public int USDBMD { get; set; }
    public double USDBND { get; set; }
    public double USDBOB { get; set; }
    public double USDBRL { get; set; }
    public int USDBSD { get; set; }
    public double USDBTC { get; set; }
    public double USDBTN { get; set; }
    public double USDBWP { get; set; }
    public double USDBYN { get; set; }
    public int USDBYR { get; set; }
    public double USDBZD { get; set; }
    public double USDCAD { get; set; }
    public double USDCDF { get; set; }
    public double USDCHF { get; set; }
    public double USDCLF { get; set; }
    public double USDCLP { get; set; }
    public double USDCNY { get; set; }
    public double USDCOP { get; set; }
    public double USDCRC { get; set; }
    public int USDCUC { get; set; }
    public double USDCUP { get; set; }
    public double USDCVE { get; set; }
    public double USDCZK { get; set; }
    public double USDDJF { get; set; }
    public double USDDKK { get; set; }
    public double USDDOP { get; set; }
    public double USDDZD { get; set; }
    public double USDEGP { get; set; }
    public double USDERN { get; set; }
    public double USDETB { get; set; }
    public double USDEUR { get; set; }
    public double USDFJD { get; set; }
    public double USDFKP { get; set; }
    public double USDGBP { get; set; }
    public double USDGEL { get; set; }
    public double USDGGP { get; set; }
    public double USDGHS { get; set; }
    public double USDGIP { get; set; }
    public double USDGMD { get; set; }
    public double USDGNF { get; set; }
    public double USDGTQ { get; set; }
    public double USDGYD { get; set; }
    public double USDHKD { get; set; }
    public double USDHNL { get; set; }
    public double USDHRK { get; set; }
    public double USDHTG { get; set; }
    public double USDHUF { get; set; }
    public int USDIDR { get; set; }
    public double USDILS { get; set; }
    public double USDIMP { get; set; }
    public double USDINR { get; set; }
    public int USDIQD { get; set; }
    public double USDIRR { get; set; }
    public double USDISK { get; set; }
    public double USDJEP { get; set; }
    public double USDJMD { get; set; }
    public double USDJOD { get; set; }
    public double USDJPY { get; set; }
    public double USDKES { get; set; }
    public double USDKGS { get; set; }
    public double USDKHR { get; set; }
    public double USDKMF { get; set; }
    public double USDKPW { get; set; }
    public double USDKRW { get; set; }
    public double USDKWD { get; set; }
    public double USDKYD { get; set; }
    public double USDKZT { get; set; }
    public double USDLAK { get; set; }
    public double USDLBP { get; set; }
    public double USDLKR { get; set; }
    public double USDLRD { get; set; }
    public double USDLSL { get; set; }
    public double USDLTL { get; set; }
    public double USDLVL { get; set; }
    public double USDLYD { get; set; }
    public double USDMAD { get; set; }
    public double USDMDL { get; set; }
    public double USDMGA { get; set; }
    public double USDMKD { get; set; }
    public double USDMMK { get; set; }
    public double USDMNT { get; set; }
    public double USDMOP { get; set; }
    public double USDMRO { get; set; }
    public double USDMUR { get; set; }
    public double USDMVR { get; set; }
    public double USDMWK { get; set; }
    public double USDMXN { get; set; }
    public double USDMYR { get; set; }
    public double USDMZN { get; set; }
    public double USDNAD { get; set; }
    public double USDNGN { get; set; }
    public double USDNIO { get; set; }
    public double USDNOK { get; set; }
    public double USDNPR { get; set; }
    public double USDNZD { get; set; }
    public double USDOMR { get; set; }
    public int USDPAB { get; set; }
    public double USDPEN { get; set; }
    public double USDPGK { get; set; }
    public double USDPHP { get; set; }
    public double USDPKR { get; set; }
    public double USDPLN { get; set; }
    public double USDPYG { get; set; }
    public double USDQAR { get; set; }
    public double USDRON { get; set; }
    public double USDRSD { get; set; }
    public double USDRUB { get; set; }
    public double USDRWF { get; set; }
    public double USDSAR { get; set; }
    public double USDSBD { get; set; }
    public double USDSCR { get; set; }
    public double USDSDG { get; set; }
    public double USDSEK { get; set; }
    public double USDSGD { get; set; }
    public double USDSHP { get; set; }
    public double USDSLL { get; set; }
    public double USDSOS { get; set; }
    public double USDSRD { get; set; }
    public double USDSTD { get; set; }
    public double USDSVC { get; set; }
    public double USDSYP { get; set; }
    public double USDSZL { get; set; }
    public double USDTHB { get; set; }
    public double USDTJS { get; set; }
    public double USDTMT { get; set; }
    public double USDTND { get; set; }
    public double USDTOP { get; set; }
    public double USDTRY { get; set; }
    public double USDTTD { get; set; }
    public double USDTWD { get; set; }
    public double USDTZS { get; set; }
    public double USDUAH { get; set; }
    public double USDUGX { get; set; }
    public int USDUSD { get; set; }
    public double USDUYU { get; set; }
    public double USDUZS { get; set; }
    public double USDVEF { get; set; }
    public int USDVND { get; set; }
    public double USDVUV { get; set; }
    public double USDWST { get; set; }
    public double USDXAF { get; set; }
    public double USDXAG { get; set; }
    public double USDXAU { get; set; }
    public double USDXCD { get; set; }
    public double USDXDR { get; set; }
    public double USDXOF { get; set; }
    public double USDXPF { get; set; }
    public double USDYER { get; set; }
    public double USDZAR { get; set; }
    public double USDZMK { get; set; }
    public double USDZMW { get; set; }
    public double USDZWL { get; set; }
}

public class RootObject
{
    public bool success { get; set; }
    public string terms { get; set; }
    public string privacy { get; set; }
    public int timestamp { get; set; }
    public string source { get; set; }
    public Quotes quotes { get; set; }
}

使用JsonConvert.DeserializeObject<T>方法获取模型。

var jsonObj = JsonConvert.DeserializeObject<RootObject>(jsonData);
var USDEUR = jsonObj.quotes.USDEUR //object property to get your field.

使用JObject.Parse方法来解析json

示例代码：

string url = @"http://apilayer.net/api/live? access_key=8efc5a54419e913b695f694bbef4d97f& currencies = EUR,GBP,CAD,PLN& source = USD& format = 1";
string objects = new WebClient().DownloadString(url);
var jsonObj= JObject.Parse(objects);
string USDEUR = (string)jsonObj["quotes"]["USDEUR"];

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注意：

有两种方法可以轻松地创建模型。

您可以在Visual Studio中使用Web Essentials，使用“编辑”>“选择性粘贴”>将JSON粘贴为类，可以更轻松地了解Json与模型之间的关系。
如果您不能使用Web Essentials，则可以改为http://json2csharp.com/在线JSON到Model类。

如何从C＃控制台应用程序中的Web服务中的JSON元素中获取要交换的办公室？

1 个答案: