ASMX web-services and HTTP GET

Question

I'm trying create a ASMX webservice that can perform a HTTP GET request. I have the following simple snippet of code to illustrate what I've already done.

using System.Web.Script.Services;
...

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public string HelloWorld(HttpContext context)
{
 return context.Request.Params.Get("userId").ToString();
}

In addition to this, I've also added the following nodes in my Web.config file

<webServices>
  <protocols>
    <add name="HttpGet"/>
    <add name="HttpPost"/>
  </protocols>
</webServices>

The problem that I'm facing is that I'm constantly getting the dreaded "System.Web.HttpContext cannot be serialized because it does not have a parameterless constructor" error message whenever I try to debug this webservice. I have no idea what the problem is, and I would really appreciate any assistance that is offered to get me out of this quandary. I realize that HTTP GET requests are supposed to be very simple, but I'm really uncertain of what the cause of my frustrations are.

Rup · Accepted Answer · 2010-06-25 16:15:13Z

4

I think you want

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public string HelloWorld(int userId)
{
    return userId.ToString();
}

You can specify parameters in the function signature and you can access the HttpContext as Context (a property on the base class WebService) if you need it.

answered Jun 25, 2010 at 16:15

Rup

34.6k9 gold badges86 silver badges119 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Sal Over a year ago

In my personal experience the [ScriptMethod(UseHttpGet = true)] does not effect the service method at all. It does not force the method to only use GET and without it you can still call the method with GET as long as you've allowed it in your web.config

Collectives™ on Stack Overflow

ASMX web-services and HTTP GET

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related