c# – 如何重構這些具有一行差異的函式

我有3個功能,其中唯一的區別是我指出的值與評論

//-- point of difference

所有這三個功能的大部分功能是一樣的. “幹”因素正在困擾我的睡眠:).我在想;這些可以容易地和可讀地併入嗎？

我以前有這樣的情況,我希望在這裡學習東西.

private string RenderRequestType(string render, NameValueCollection nvp, string prefix, string regexWild, string suffix)
{
string regex = prefix + regexWild + suffix;

MatchCollection matches = Regex.Matches(render, regex);

foreach (Match match in matches)
{
foreach (Capture capture in match.Captures)
{
string name = capture.Value.Replace(prefix, "", StringComparison.CurrentCultureIgnoreCase).Replace(suffix, "", StringComparison.CurrentCultureIgnoreCase);

//-- point of difference
string value = nvp[name];

render = render.Replace(capture.Value, value);
}
}

return render;
}

private string RenderSessionType(string render, HttpContext httpContext, string prefix, string regexWild, string suffix)
{
string regex = prefix + regexWild + suffix;

MatchCollection matches = Regex.Matches(render, regex);

foreach (Match match in matches)
{
foreach (Capture capture in match.Captures)
{
string name = capture.Value.Replace(prefix, "", StringComparison.CurrentCultureIgnoreCase).Replace(suffix, "", StringComparison.CurrentCultureIgnoreCase);

//-- point of difference
object session = httpContext.Session[name];
string value = (session != null ? session.ToString() : "");

render = render.Replace(capture.Value, value);
}
}

return render;
}

private string RenderCookieType(string render, HttpContext httpContext, string prefix, string regexWild, string suffix)
{
string regex = prefix + regexWild + suffix;

MatchCollection matches = Regex.Matches(render, regex);

foreach (Match match in matches)
{
foreach (Capture capture in match.Captures)
{
string name = capture.Value.Replace(prefix, "", StringComparison.CurrentCultureIgnoreCase).Replace(suffix, "", StringComparison.CurrentCultureIgnoreCase);

//-- point of difference
HttpCookie cookie = httpContext.Request.Cookies[name];
string value = (cookie != null ? cookie.Value : "");

render = render.Replace(capture.Value, value);
}
}

return render;
}

string,string>做查詢：

private string RenderType(string render, Func<string, string> lookupFunc, string prefix, string regexWild, string suffix)
{
string regex = prefix + regexWild + suffix;

MatchCollection matches = Regex.Matches(render, regex);

foreach (Match match in matches)
{
foreach (Capture capture in match.Captures)
{
string name = capture.Value.Replace(prefix, "", StringComparison.CurrentCultureIgnoreCase).Replace(suffix, "", StringComparison.CurrentCultureIgnoreCase);

//-- point of difference
string value = lookupFunc(name);

render = render.Replace(capture.Value, value);
}
}

return render;
}

然後根據這個功能編寫你的功能,例如：

private string RenderRequestType(string render, NameValueCollection nvp, string prefix, string regexWild, string suffix)
{
return RenderType(render, name => nvp[name], prefix, regexWild, suffix);
}