How do i get the invoked operation name within a WCF Message Inspector

Question

I'm doing a message inspector in WCF:

public class LogMessageInspector :
    IDispatchMessageInspector, IClientMessageInspector

which implements the method:

public object AfterReceiveRequest(ref Message request,
    IClientChannel channel, InstanceContext instanceContext)

I can get the name of the invoked service with:

instanceContext.GetServiceInstance().GetType().Name

But how do I get the name of the invoked operation?

score 12 · Answer 1 · edited Sep 28 '11 at 00:04

12

It's not pretty, but this is what I did to get the operation name:

var action = OperationContext.Current.IncomingMessageHeaders.Action;
var operationName = action.Substring(action.LastIndexOf("/", StringComparison.OrdinalIgnoreCase) + 1);

edited Sep 28 '11 at 00:04

answered Mar 19 '10 at 12:30

Kent Boogaart

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`Operation.Current` is null in my case, it works if you retrieve the action through the Message object from the parameter as: `System.ServiceModel.Channels.Message request` ... `request.Headers.Action`. – EzLo Feb 20 '20 at 07:23

score 8 · Answer 2 · edited Jun 11 '15 at 15:09

8

var operationName = OperationContext.Current.IncomingMessageProperties["HttpOperationName"] as string;

edited Jun 11 '15 at 15:09

bonh

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answered Mar 01 '11 at 03:31

Michael

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Throws an `ArgumentException` for me – xr280xr Feb 04 '20 at 00:38

score 4 · Answer 3 · answered Oct 09 '14 at 20:12

4

This approach is similar to others presented here, but uses Path.GetFileName:

Path.GetFileName(OperationContext.Current.IncomingMessageHeaders.Action);

The return value of this method and the format of the path string work quite harmoniously in this scenario:

The characters after the last directory character in path. If the last character of path is a directory or volume separator character, this method returns String.Empty. If path is null, this method returns null.

answered Oct 09 '14 at 20:12

Derek W

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Came up as an empty string for me, while Michael's answer worked. – jk7 Jan 29 '16 at 01:24
@jk7: That is due to the fact that you are making RESTful requests (using `WebHttpBinding` of WCF). The solution above will work for SOAP requests (any standard bindings besides `WebHttpBinding`) while @Michael's solution will work for RESTful requests. – Derek W Jan 29 '16 at 13:22
Related question here: https://stackoverflow.com/questions/852860/wcf-retrieving-methodinfo-from-operationcontext – Derek W Jan 29 '16 at 13:27

score 2 · Answer 4 · answered Oct 08 '12 at 03:00

2

OperationContext.Current.IncomingMessageHeaders.Action.Split('/').ToList().Last();

answered Oct 08 '12 at 03:00

Prasad Kanaparthi

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The ToList() isn't necessary, is it? – marknuzz Jul 12 '14 at 07:25
@Nuzzolilo, Not Required. – Prasad Kanaparthi Jul 17 '14 at 10:21

score 1 · Answer 5 · answered Nov 01 '18 at 11:13

Little late to the party but I had to dig a little deeper than existing answers on this question because they seem to involve getting the action name and not the operation name. (Frequently they are the same so getting the action name does, in fact, get the operation name.)

Microsoft's Application Insights SDK Labs' WCF library makes this concerted effort:

private string DiscoverOperationName(OperationContext operationContext)
{
    var runtime = operationContext.EndpointDispatcher.DispatchRuntime;
    string action = operationContext.IncomingMessageHeaders.Action;
    if (!string.IsNullOrEmpty(action))
    {
        foreach (var op in runtime.Operations)
        {
            if (op.Action == action)
            {
                return op.Name;
            }
        }
    }
    else
    {
        // WebHttpDispatchOperationSelector will stick the
        // selected operation name into a message property
        return this.GetWebHttpOperationName(operationContext);
    }

    var catchAll = runtime.UnhandledDispatchOperation;
    if (catchAll != null)
    {
        return catchAll.Name;
    }

    return "*";
}

private string GetWebHttpOperationName(OperationContext operationContext)
{
    var name = WebHttpDispatchOperationSelector.HttpOperationNamePropertyName;
    if (this.HasIncomingMessageProperty(name))
    {
        return this.GetIncomingMessageProperty(name) as string;
    }

    return "<unknown>";
}

How do i get the invoked operation name within a WCF Message Inspector

5 Answers5

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