CODEWITHSUNDEEP
c#.netasp.net-core.net-coreasp.net-core-webapi
Zeeshan Adil
Zeeshan Adil

Reputation: 2135

QueryString.Add not adding value to the Request query strings in ASP.NET Core

I am writing a middleware where I want to modify query string values for the current request but I am unable to do that. afaik QueryString.Add method should work but it doesn't affect the query string. Here's what I tried.

public async Task Invoke(HttpContext context, IHeaderValue headerValue, IUser user)
{
    var result = context.Request.Headers["Authorization"];

    if (result.Count != 0)
    {

        headerValue.UserId = this.GetUserIdFromToken(result[0]);

        var request = context.Request;

        if (request.Method == "GET")
        {
            // It should be adding the new query value to the QueryString collection
            // but it doesn't
            request.QueryString.Add("CurrentUserId", headerValue.UserId.ToString());
        }
    }
}

I will really appreciate any help with this.

Upvotes: 9

Views: 4287

Answers (1)

canton7
canton7

Reputation: 42330

QueryString.Add returns a new QueryString containing the given name and value. It doesn't mutate the QueryString on which it's called.

So you need to do something like

request.QueryString = request.QueryString.Add("A", "B");

Upvotes: 13

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