Add custom parameter into every query string using MVC action filter

Question

Basically I am try to add some custom query parameter into my all browser request using MVC action filter.

I am try to add action filter and write below code but getting error. like: NotSupportedException: Collection was of a fixed size.

public class CustomActionFilters : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        filterContext.RouteData.Values.Keys.Add("customPara");

        filterContext.RouteData.Values.Values.Add("myAllcustomparamter");
                                  //OR
        filterContext.HttpContext.Request.Query.Keys.Add("customPara=myAllcustomparamter"); 
    }
}

So if I am write into url :http://localhost:15556/

than it will be http://localhost:15556?customPara=myAllcustomparamter

if open any other page like http://localhost:15556/image than it will be http://localhost:15556/image?customPara=myAllcustomparamter OR http://localhost:15556/image?inbuildparamter=anyvalue it will be http://localhost:15556/image?inbuildparamter=anyvalue&customPara=myAllcustomparamter

In this case the action has already executed so I don't think you can add to the route/manipulate the request. What is the goal of the add'l parameter? Are you trying to trigger additional logic? — Stinky Towel
– Stinky Towel, Commented Apr 19, 2019 at 12:57
I want to use that custom queries into ARR DISK cache using url rewrite. — Kalpesh Boghara
– Kalpesh Boghara, Commented Apr 20, 2019 at 13:12
Can you use the url rewrite in ARR instead? Presumably this is doable prior to disk cache kicking in. — Stinky Towel
– Stinky Towel, Commented Apr 22, 2019 at 15:55
I have tried but customPara=myAllcustomparamter this is dynamic and I want to add from code side. once it's added than next step is ARR — Kalpesh Boghara
– Kalpesh Boghara, Commented Apr 24, 2019 at 4:45

Kalpesh Boghara · Accepted Answer · 2019-04-24 08:34:55Z

Finally got solution using redirect into action filter.

public class CustomActionFilters : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        string longurl = HttpContext.Current.Request.Url.AbsoluteUri;
        var uriBuilder = new UriBuilder(longurl);
        var query = HttpUtility.ParseQueryString(uriBuilder.Query);
        var myAllcustomparamter = "myAllcustomparamterhere";
        query.Add("customPara", myAllcustomparamter);
        uriBuilder.Query = query.ToString();
        longurl = uriBuilder.ToString();
        if (!filterContext.HttpContext.Request.QueryString.HasValue || (filterContext.HttpContext.Request.QueryString.HasValue && !filterContext.HttpContext.Request.QueryString.Value.Contains("customPara")))
        {
            filterContext.Result = new RedirectResult(longurl);

        }                       
    }
}

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