Can I use dictionary to add my query parameters in restsharp in addqueryparameter method?

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I have my sendRequest method where I am passing my contentType, token and query params.
I have used a Dictionary<string, string> for my query params but I am getting an error. It shows AddQueryParameter takes string name, string value so I am confused as to why it can not accept a Dictionary. The error I get it
"No overload for method AddQueryParameter"

Also my request.AddParameter getting an error here of "Use of un assigned local variable". Should I assign my IRestRequest request variable to = null. Wont that cause nullpointerexception?

Here is what I have

private static IRestRequest sendRequest(string contentType, string token, Dictionary<string, string> paramsMap)
        {
            IRestRequest request;

           //if token is null no need to add the token. Some request requires token, 
            Some does not

            if (token != null)
            {
                request.AddParameter("Authorization", "Bearer" + token, 
                      ParameterType.HttpHeader);

            }

            if (!(paramsMap == null))
            {   
                request.AddQueryParameter(paramsMap);
            }

           

           if (contentType != null) //if contentType is not null then add content type
            {
                if (contentType.Equals("JSON"))
                {
                    request.AddHeader("Accept", "application/json");
                }
                else if (contentType.Equals("XML"))
                {
                    request.AddHeader("Accept", "application/xml");
                }
                else if (contentType.Equals("TEXT"))
                {
                    request.AddHeader("Accept", "text/plain");
                }
            }

            return request;
        }

What I have tried:

private static IRestRequest sendRequest(string contentType, string token, Dictionary<string, string> paramsMap)
        {
         IRestRequest request = null; //this may solve my local request variable problem

           //if token is null no need to add the token. Some request requires token, 
            Some does not

            if (token != null)
            {
                request.AddParameter("Authorization", "Bearer" + token, 
                      ParameterType.HttpHeader);

            }

            if (!(paramsMap == null))
            {   
                request.AddQueryParameter(paramsMap);
            }

           

           if (contentType != null) //if contentType is not null then add content type
            {
                if (contentType.Equals("JSON"))
                {
                    request.AddHeader("Accept", "application/json");
                }
                else if (contentType.Equals("XML"))
                {
                    request.AddHeader("Accept", "application/xml");
                }
                else if (contentType.Equals("TEXT"))
                {
                    request.AddHeader("Accept", "text/plain");
                }
            }

            return request;
        }

Posted 12-May-20 16:33pm

Member 14779968

Updated 13-May-20 6:01am

v3

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Richard Deeming · Answer 1 · 2020-05-13T06:02:00

You're trying to call a method which accepts two strings, but you're trying to pass in a Dictionary<string, string>.

Computers don't just "guess" what you meant to do; they do exactly what you tell them to do. If you tell it to call a method called AddQueryParameter passing in a Dictionary<string, string>, the computer will - correctly - tell you that there is no such method.

You need to iterate over the values in the dictionary and add them separately:

C#

if (paramsMap != null)
{
    foreach (KeyValuePair<string, string> pair in paramsMap)
    {
        request.AddQueryParameter(pair.Key, pair.Value);
    }
}

You're getting an "unassigned local variable" error because you haven't assigned a value to the request parameter. And no, you can't set it to null, because then you'd get a NullReferenceException at run-time. You need to create a new request instance and store it in that variable before you try to do anything with the variable.