How to get parameter in OnActionExecuting?

Question

I modify the default route rule a little bit as below:

routes.MapRoute(
  "Default",                                              // Route name
  "{controller}/{action}/{id}",                           // URL with parameters
  new { controller = "Home", action = "Index", id= (string)null }  // Parameter defaults
);

Then I can set url as:

/Controller/Action/myParam
/Home/Index/MyParam

The default Action Index would be:

public ActionResult Index(string id)
{
  //....
}

I can get the param in action. But I want to get the param in OnActionExecuting. How can I do it?

Çağdaş Tekin · Accepted Answer · 2009-07-23 17:11:30Z

29

You should be able to access it with :

public override void OnActionExecuting(ActionExecutingContext filterContext) {
    string id = filterContext.RouteData.Values["id"];
    //...
}

answered Jul 23, 2009 at 17:11

Çağdaş Tekin

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2 Comments

Levi Over a year ago

This is also exposed via the ActionExecutingContext.ActionParameters property. The ActionParameters property allows you to see or change the parameters that will actually be passed to the action method.

cah1r Over a year ago

@Levi you should post this as answer

Nayeem Bin Ahsan · Accepted Answer · 2021-06-02 09:51:49Z

1

It can be accessible from ActionArguments inside OnActionExecuting.

public override void OnActionExecuting(ActionExecutingContext context) {
    string id = context.ActionArguments["id"].ToString();
    //...
}

edited Jun 2, 2021 at 9:51

answered Jun 2, 2021 at 9:26

Nayeem Bin Ahsan

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Comments

Sonic Soul · Accepted Answer · 2014-04-05 14:31:30Z

0

if you want to get controller, action, and all parameters, you can do this

    var valuesStr = new StringBuilder();
    if (ctx.RouteData != null && ctx.RouteData.Values != null)
        foreach (var v in ctx.RouteData.Values)
            valuesStr.AppendFormat("/{0}", v.Value);
    _logger.Info("executing {0}", valuesStr.ToString());
    which results in the whole path

results with:

"/Get/Customer/215840"

it should work on multiple parameters just as well.

edited Apr 5, 2014 at 14:31

answered Apr 4, 2014 at 21:22

Sonic Soul

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Comments

it dũng · Accepted Answer · 2020-06-06 06:13:18Z

I use the following code to retrieve and compare the parameters passed to an action (.net core 3.1).

var vals = filterContext.ActionArguments.Values;
var fistobj = vals.FirstOrDefault();
var val = fistobj.GetType().GetProperties().FirstOrDefault(x => string.Equals(x.Name, "nameParameter", StringComparison.OrdinalIgnoreCase)).GetValue(fistobj);
if (val == null || val.ToString() != "value parameter")
{
    filterContext.Result = new JsonResult(ExecuteResult.Fail(JanException.Parameter.API00001));
    //base.OnActionExecuting(filterContext);
    return;
}

More details for OnActionExecuting and a custom Attribute InitializingActionAttribute

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        ControllerActionDescriptor controlActionDescriptor = (ControllerActionDescriptor)filterContext.ActionDescriptor;
        var attributes = controlActionDescriptor.MethodInfo.CustomAttributes;
        if (attributes.Any(a => a.AttributeType == typeof(InitializingActionAttribute)))
        {
            var vals = filterContext.ActionArguments.Values;
            var fistobj = vals.FirstOrDefault();
            var val = fistobj.GetType().GetProperties().FirstOrDefault(x => string.Equals(x.Name, "nameParameter", StringComparison.OrdinalIgnoreCase)).GetValue(fistobj);
            if (val == null || val.ToString() != "value parameter")
            {
                filterContext.Result = new JsonResult(ExecuteResult.Fail(JanException.Parameter.API00001));
                //base.OnActionExecuting(filterContext);
                return;
            }
        }
        base.OnActionExecuting(filterContext);
    }

Freddy · Accepted Answer · 2009-07-23 17:15:14Z

-6

From your filterContext you should be able to get whatever you need.


public class MyAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
       //Do your stuff here
    }
}

[MyAttribute]
public ActionResult Index(string id)
{
  //....
}

answered Jul 23, 2009 at 17:15

Freddy

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