Question

...或“如何根据URI确定调用哪个WCF方法？”

在WCF服务中，假设调用了一个方法，并且我有用于调用它的URI。如何获取有关URI映射到的WCF端点，方法，参数等的信息？

[OperationContract]
[WebGet(UriTemplate = "/People/{id}")]
public Person GetPersonByID(int id)
{
    //...
}

例如，如果URI是：GET http://localhost/Contacts.svc/People/1，我想获取此信息：服务名称（服务），方法（GetPersonByID），参数（PersonID = 1）。关键是能够侦听请求，然后提取请求的详细信息，以便跟踪API调用。

该服务通过http托管。在.Net缓存可以启动之前，此信息是必需的，因此可以跟踪每个调用（无论是否缓存）。这可能意味着在HttpApplication.BeginRequest内执行此操作。

仅供参考我希望不使用反射。我想使用WCF用来确定这个的相同方法。例如。 MagicEndPointFinder.Resolve(uri)

Answer 1

这是我最终做的事情，如果有更清洁的方式仍然感兴趣！

REST

private static class OperationContractResolver
{
    private static readonly Dictionary<string, MethodInfo> RegularExpressionsByMethod = null;

    static OperationContractResolver()
    {
    OperationContractResolver.RegularExpressionsByMethod = new Dictionary<string, MethodInfo>();

    foreach (MethodInfo method in typeof(IREST).GetMethods())
    {
        WebGetAttribute attribute = (WebGetAttribute)method.GetCustomAttributes(typeof(WebGetAttribute), false).FirstOrDefault();

        if (attribute != null)
        {
        string regex = attribute.UriTemplate;

        //Escape question marks. Looks strange but replaces a literal "?" with "\?".
        regex = Regex.Replace(regex, @"\?", @"\?");

        //Replace all parameters.
        regex = Regex.Replace(regex, @"\{[^/$\?]+?}", @"[^/$\?]+?");

        //Add it to the dictionary.
        OperationContractResolver.RegularExpressionsByMethod.Add(regex, method);
        }
    }
    }

    public static string ExtractApiCallInfo(string relativeUri)
    {
    foreach (string regex in OperationContractResolver.RegularExpressionsByMethod.Keys)
        if (Regex.IsMatch(relativeUri, regex, RegexOptions.IgnoreCase))
        return OperationContractResolver.RegularExpressionsByMethod[regex].Name;

    return null;
    }
}

SOAP

private static void TrackSoapApiCallInfo(HttpContext context)
{
    string filePath = Path.GetTempFileName();
    string title = null;

    //Save the request content. (Unfortunately it can't be written to a stream directly.)
    context.Request.SaveAs(filePath, false);

    //If the title can't be extracted then it's not an API method call, ignore it.
    try
    {
    //Read the name of the first element within the SOAP body.
    using (XmlReader reader = XmlReader.Create(filePath))
    {
        if (!reader.EOF)
        {
        XmlNamespaceManager nsManager = new XmlNamespaceManager(reader.NameTable);
        XDocument document = XDocument.Load(reader);

        //Need to add the SOAP Envelope namespace to the name table.
        nsManager.AddNamespace("s", "http://schemas.xmlsoap.org/soap/envelope/");
        title = document.XPathSelectElement("s:Envelope/s:Body", nsManager).Elements().First().Name.LocalName;
        }
    }

    //Delete the temporary file.
    File.Delete(filePath);
    }
    catch { }

    //Track the page view.
}

查找基于URI的匹配OperationContract

1 个答案:

REST

SOAP