使用参数过滤属性（XPath-LINQ to XML）

Question

此代码无效

public HttpResponseMessage Get(string par)
{
    String JsonData, JsonFromXML;
    XElement root = XElement.Load("http://www.mywebsite.com/mapdata_xml.xml");
    IEnumerable<XElement> address =
        from el in root.Elements("marker")
        where (string) el.Attribute("province") == par
        orderby (string)el.Attribute("name")
        select el;


    var XMLData = "";
    foreach (XElement el in address)
        XMLData = XMLData + el;
    //XMLData = "<markers>" + XMLData + "</markers>";


    XmlDocument xd = new XmlDocument();
    xd.LoadXml("<markers>" + XMLData + "</markers>");

    JsonFromXML = JsonConvert.SerializeXmlNode(xd);

    JsonFromXML = JsonFromXML.Remove(0, 11);
    JsonFromXML = JsonFromXML.Substring(0, JsonFromXML.Length - 1);
    JsonData = JsonFromXML.Replace("\"@", "\"");

    return new HttpResponseMessage()
    {
        Content = new StringContent(JsonData)
    };
}

网络 API : http://localhost:55607/api/Test?par=%22Pursat%22

参数：par

问题：我有一个 Web API (http://localhost:55607/api/Test?par=%22Pursat%22)。我想将参数 "Pursat" 传递给 ASP.Net (public HttpResponseMessage Get(string par) name "Par")。然后我什么也得不到。但是，当我这样使用时（where (string) el.Attribute("province") == "Pursat"），我可以从我的代码中获取数据。

这段代码运行良好

public HttpResponseMessage Get(string par)
{
    String JsonData, JsonFromXML;
    XElement root = XElement.Load("http://www.mywebsite.com/mapdata_xml.xml");
    IEnumerable<XElement> address =
        from el in root.Elements("marker")
        where (string) el.Attribute("province") == "Pursat"
        orderby (string)el.Attribute("name")
        select el;


    var XMLData = "";
    foreach (XElement el in address)
        XMLData = XMLData + el;
    //XMLData = "<markers>" + XMLData + "</markers>";


    XmlDocument xd = new XmlDocument();
    xd.LoadXml("<markers>" + XMLData + "</markers>");

    JsonFromXML = JsonConvert.SerializeXmlNode(xd);

    JsonFromXML = JsonFromXML.Remove(0, 11);
    JsonFromXML = JsonFromXML.Substring(0, JsonFromXML.Length - 1);
    JsonData = JsonFromXML.Replace("\"@", "\"");

    return new HttpResponseMessage()
    {
        Content = new StringContent(JsonData)
    };
}

我想通过参数"par"查询数据而不是固定数据"Pursat"。

你知道如何解决这个问题吗？

Answer 1

您似乎在传递带有双引号的值（HTML 编码中的 %22 = "）。所以实际上，您查询中的 where 看起来像这样：

where (string) el.Attribute("province") == ""Pursat""

而如果你这样称呼它：

http://localhost:55607/api/Test?par=Pursat

您的 where 子句如下所示：

where (string) el.Attribute("province") == "Pursat"

使用参数过滤属性（XPath-LINQ to XML）

Filter on an Attribute (XPath-LINQ to XML) by using parameter

c#

parameters

asp.net-mvc

linq-to-xml