Question

我正在尝试解析以下页面：

http://sdw-wsrest.ecb.europa.eu/service/data/YC/B.U2.EUR.4F.G_N_A.SV_C_YM.BETA0+BETA1+BETA2+BETA3+TAU1+TAU2?lastNObservations=1

以获取BETA0，BETA1等的值....

我很挣扎，因为它看起来网页是SDMX格式而不是常规XML。如果有人可以帮助您使用c＃片段，我们将不胜感激。

提前谢谢。

Answer 1

您可以使用适用于Java和.NET的SDMXSource库。

否则，如果使用更简单的结构特定格式而不是通用格式检索相同的数据，则可以更容易地解析数据，类似于CSV格式。为了获得结构特定的格式，将Accept标头设置为'application / vnd.sdmx.structurespecificdata + xml; version = 2.1'。

您可能会发现此cheat sheet有用。

<强>更新

以下是解析特定于strcuture格式的示例，以便在不使用库的情况下生成键/值记录。它没有涵盖所有可能的情况（例如数据集级别属性），但它是一个良好的开端，适用于此特定数据消息。

XML：

<message:DataSet data:action="Replace" data:validFromDate="2017-01-25T22:31:14.760+01:00" data:structureRef="ECB_FMD2" data:dataScope="DataStructure" xsi:type="ecb_fmd2:DataSetType">
    <Series FREQ="B" REF_AREA="U2" CURRENCY="EUR" PROVIDER_FM="4F" INSTRUMENT_FM="G_N_A" PROVIDER_FM_ID="SV_C_YM" DATA_TYPE_FM="BETA0" COLLECTION="E" TITLE_COMPL="Euro area (changing composition) - Government bond, nominal, all issuers whose rating is triple A - Svensson model - continuous compounding - yield error minimisation - Yield curve parameters, Beta 0 - Euro, provided by ECB" DECIMALS="6" UNIT="PURE_NUMB" TITLE="Yield curve parameters, Beta 0 - Government bond, nominal, all issuers whose rating is triple A - Euro area (changing composition)" UNIT_MULT="0">
        <Obs TIME_PERIOD="2017-01-24" OBS_VALUE="1.775611976078084" OBS_STATUS="A" OBS_CONF="F"/>
    </Series>
    <Series FREQ="B" REF_AREA="U2" CURRENCY="EUR" PROVIDER_FM="4F" INSTRUMENT_FM="G_N_A" PROVIDER_FM_ID="SV_C_YM" DATA_TYPE_FM="BETA1" COLLECTION="E" TITLE_COMPL="Euro area (changing composition) - Government bond, nominal, all issuers whose rating is triple A - Svensson model - continuous compounding - yield error minimisation - Yield curve parameters, Beta 1 - Euro, provided by ECB" DECIMALS="6" UNIT="PURE_NUMB" TITLE="Yield curve parameters, Beta 1 - Government bond, nominal, all issuers whose rating is triple A - Euro area (changing composition)" UNIT_MULT="0">
        <Obs TIME_PERIOD="2017-01-24" OBS_VALUE="-2.438611976090857" OBS_STATUS="A" OBS_CONF="F"/>
    </Series>
    <Series FREQ="B" REF_AREA="U2" CURRENCY="EUR" PROVIDER_FM="4F" INSTRUMENT_FM="G_N_A" PROVIDER_FM_ID="SV_C_YM" DATA_TYPE_FM="BETA2" COLLECTION="E" TITLE_COMPL="Euro area (changing composition) - Government bond, nominal, all issuers whose rating is triple A - Svensson model - continuous compounding - yield error minimisation - Yield curve parameters, Beta 2 - Euro, provided by ECB" DECIMALS="6" UNIT="PURE_NUMB" TITLE="Yield curve parameters, Beta 2 - Government bond, nominal, all issuers whose rating is triple A - Euro area (changing composition)" UNIT_MULT="0">
        <Obs TIME_PERIOD="2017-01-24" OBS_VALUE="11.695146022367336" OBS_STATUS="A" OBS_CONF="F"/>
    </Series>       
</message:DataSet>

代码：

class Program
{
    static void Main(string[] args)
    {
        string path = @"data.xml";

        // An XmlReader created from a file on the disk or any stream like web request for example
        using (var reader = XmlReader.Create(path))
        {
            foreach (var item in GetRecords(reader))
            {
                Debug.WriteLine(string.Join(", ", item.Select(i => string.Format("{0}={1}", i.Key, i.Value))));
            }
        }
    }

    private static IEnumerable<Dictionary<string, string>> GetRecords(XmlReader reader)
    {
        Dictionary<string, string> record = null; 
        while (reader.Read())
        {
            if (reader.IsStartElement() && reader.LocalName == "Series")
            {
                record = new Dictionary<string, string>();
                while (reader.MoveToNextAttribute())
                {
                    record.Add(reader.LocalName, reader.Value);
                }
            }
            else if (reader.IsStartElement() && reader.LocalName == "Obs")
            {                   
                while (reader.MoveToNextAttribute())
                {
                    record.Add(reader.LocalName, reader.Value);
                }

                yield return record;
            }
        }
    }
}

如何解析c＃中的sdmx文件？

1 个答案: