How to PATCH data using System.Net.Http

Question

I have uploaded a file to SharePoint and found out what id it has. Now I need to update some of the other columns on that listitem. The problem is that System.Net.Http.HttpMethod.Patch doesn't exist.

public static async Task<string> UpdateFileData()
{
    var (authResult, message) = await Authentication.AquireTokenAsync();

    string updateurl = MainPage.rooturl + "lists/edd49389-7edb-41db-80bd-c8493234eafa/items/" + fileID + "/";
    var httpClient = new HttpClient();
    HttpResponseMessage response;
    try
    {
        var root = new
        {
            fields = new Dictionary<string, string>
            {
                { "IBX", App.IBX },  //column to update
                { "Year", App.Year}, //column to update
                { "Month", App.Month} //column to update
            }
        };

        var s = new JsonSerializerSettings { DateFormatHandling = DateFormatHandling.MicrosoftDateFormat };
        var content = JsonConvert.SerializeObject(root, s);
        var request = new HttpRequestMessage(HttpMethod.Put, updateurl);
        request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", authResult.AccessToken);
        request.Content = new StringContent(content, Encoding.UTF8, "application/json");
        response = await httpClient.SendAsync(request);
        var responseString = await response.Content.ReadAsStringAsync();
        return responseString;
    }
    catch (Exception ex)
    {
        return ex.ToString();
    }
}

Answer 1

Can't you just use the HttpMethod class constructor?

new HttpMethod("PATCH");

Source: https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpmethod.-ctor?view=netframework-4.7.2#System_Net_Http_HttpMethod__ctor_System_String_