Generic method for builing a query string of classes in Typescript

This method below can be used in Typescript to build up a query string from a given object of a class instance in Typescript. Use it when performing HTTP(S) GET calls.

  BuildQueryString<T>(input: T): string {
    let q = "?";

    Object.keys(input).forEach(key => q += key + "=" + input[key] + "&");

    if (q.length > 0) {
      q = q.substr(0,q.length-1);
    }

    return q;

    
  }

Sample usage in Angular 8 solution of mine for example:

  async saveSurvey(): Promise<SurveyItem> {
    //debugger
    let s: SurveyItem = {
      Id: 0, LastUpdate: new Date(),
      EquipmentNumber: this.equpimentIdentifier, RoomNumber: this.roomIdentifier,
      PrimaryUsage: this.primaryUsage,
      IsInspected: this.GetBoolean(this.isInspected), IsNotFound: this.GetBoolean(this.isNotFound)
    };
    let q = this.fetcher.GetAPIUrl('savesurvey');
    q += this.fetcher.BuildQueryString(s);
    const response = await this.http.get<SurveyItem>(q, { headers: this.corsHeaders }).toPromise();
    //this.openSnackBar('Lagret utstyr ' + this.equpimentIdentifier);
    this.openSnackBar('Lagret utstyr ' + this.equpimentIdentifier + ' Laster inn liste for utstyr i samme rom også..');

    //After saving survye - update also the properties with updated Id and LastUpdate

    this.SetCurrentSurveyItemPropretiesFromSurveyItem(response);

    this.onRoomSelected(this.roomIdentifier);



    return response;
  }