如何结合通用代码来创建通用方法？

Question

我有以下类，我使用它生成一个请求对象并序列化响应以获取JSON字符串。类的定义如下

PortfolioResponse＆amp; StocksInfo 类是为了提及目的，因为它们包含很多我无法在这里写的字段。

[DataContract]
public class BaseInfoRequest
{
    [DataMember]
    public string Token { get; set; }
}

[DataContract]
public class StocksInfoRequest : BaseInfoRequest
{
    [DataMember]
    public string SomeKey { get; set; }
}

[DataContract]
public class PortfolioInfoRequest : BaseInfoRequest
{
    [DataMember]
    public string PortfolioId { get; set; }

    [DataMember]
    public string SomeKey { get; set; }
}

[DataContract]
public class StocksInfoResponse
{
    [DataMember(Name = "success")]
    public bool Success { get; set; }

    [DataMember(Name = "message")]
    public string Message { get; set; }

    [DataMember(Name = "stocks")]
    public StocksInfo StocksInfo { get; set; }

    [DataMember(Name = "pfolio")]
    public PortfolioResponse PortfolioInfo { get; set; }
}

public class PortfolioResponse
{
}

public class StocksInfo
{
}

现在，为了从项目中获取来自不同其他类和服务的数据，我在下面使用了两种方法，比如说样本

    private string GetsStocksInformation(StocksInfoRequest request)
    {
        var response = new StocksInfoResponse();

        if (ValidateRequestToken(request) || string.IsNullOrWhiteSpace(request.SomeKey))
        {
            response.Message =
                GetsResponse().ErrorMessage;
            return JsonConvert.SerializeObject(response);
        }
        response.StocksInfo = GetsStocksInfo(request);
        response.Success = true;
        return JsonConvert.SerializeObject(response);
    }

    private string GetsPortfolioInformation(PortfolioInfoRequest request)
    {
        var response = new StocksInfoResponse();

        if (!ValidateRequestToken(request) || string.IsNullOrWhiteSpace(request.SomeKey) ||
            string.IsNullOrWhiteSpace(request.PortfolioId))
        {
            response.Message =
                GetsResponse().ErrorMessage;
            return JsonConvert.SerializeObject(response);
        }
        response.PortfolioInfo = GetsPortfolioInfo(request.SomeKey, request.PortfolioId);
        response.Success = true;
        return JsonConvert.SerializeObject(response);
    }

现在，如果仔细观察，除条件

外，两种方法几乎相同

if（ValidateRequestToken（request）|| string.IsNullOrWhiteSpace（request.SomeKey））＆amp;＆amp;

response.StocksInfo = GetsStocksInfo（request）;

除了上述两种，这两种方法或多或少都是相同的。 ValidateRequestToken 的定义在

之下

    private bool ValidateRequestToken(BaseInfoRequest request)
    {
        return true;
    }

如何组合这两种方法来创建通用方法？