如何将NameValueCollection转换为KeyValuePair

我不知道你能缩短多少。

一种可能是将get放在创建keyValuePair的位置

private static KeyValuePair<string, string> GetEtagHeader(NameValueCollection collection)
{
    string key = HttpRequestHeader.IfMatch.ToString();
    return new KeyValuePair(key, collection.Get(key));
}

这应该适合你的情况。我会更进一步,将其分为两种方法——一种用于特定的案例,另一种用于一般的帮助者。

private static KeyValuePair<string, string> GetEtagHeader(NameValueCollection collection)
{
    return ToKeyValuePair(HttpRequestHeader.IfMatch.ToString(), collection);
}

private static KeyValuePair<string, string> ToKeyValuePair(string key, NameValueCollection collection)
{
    return new KeyValuePair(key, collection.Get(key));
}

如果你把 HttpRequestHeader.IfMatch.ToString() 输入一个临时变量,而不是内联临时变量 etagValue :

private KeyValuePair<string, string> GetEtagHeader(NameValueCollection collection)
{
    string key = HttpRequestHeader.IfMatch.ToString();
    return new KeyValuePair<string, string>(key, collection.Get(key));
}

如果是我,我会像这样定义一个扩展方法:

public static class ExtensionMethods
{
    static public KeyValuePair<string,string> GetPair(this NameValueCollection source, string key)
    {
        return new KeyValuePair<string, string>
        (
            key,
            source.Get(key)
        );
    }
}

然后您可以这样编写原始代码:

private KeyValuePair<string, string> GetEtagHeader(NameValueCollection collection)
{
    return collection.GetPair(HttpRequestHeader.IfMatch.ToString());
}