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有的时候我们要操作一个url地址中查询参数，为了不破坏url的原有结构，我们一般不能直接在url的后面加&query=value，特别是我们的url中有多个参数时，这种处理更麻烦。
下面两个小方法就是专门用来为一个url添加一个查询参数或删除一个查询参数，这两个方法隐藏了原url有无参数，是不是原来就有这个参数，有没有fragment(#anchor)这些细节和处理
/**//// <summary>
/// add a query to an url.
/// if the url has not any query,then append the query key and value to it.
/// if the url has some queries, then check it if exists the query key already,replace the value, or append the key and value
/// if the url has any fragment, append fragments to the url end.
/// </summary>
public static string safeaddquerytourl(string key,string value,string url)
{
int fragpos = url.lastindexof("#");
string fragment = string.empty;
if(fragpos > -1)
{
fragment = url.substring(fragpos);
url = url.substring(0,fragpos);
}
int querystart = url.indexof("?");
if(querystart < 0)
{
url +="?"+key+"="+value;
}
else
{
regex reg = new regex(@"(?<=[&\?])"+key+@"=[^\s&#]*",regexoptions.compiled);
if(reg.ismatch(url))
url = reg.replace(url,key+"="+value);
else
url += "&"+key+"="+value;
}
return url+fragment;
}
/**//// <summary>
/// remove a query from url
/// </summary>
/// <param name="key"></param>
/// <param name="url"></param>
/// <returns></returns>
public static string saferemovequeryfromurl(string key,string url)
{
regex reg = new regex(@"[&\?]"+key+@"=[^\s&#]*&?",regexoptions.compiled);
return reg.replace(url,new matchevaluator(putawaygarbagefromurl));
}
private static string putawaygarbagefromurl(match match)
{
string value = match.value;
if(value.endswith("&"))
return value.substring(0,1);
else
return string.empty;
}
测试：
string s = "http://www.cnblogs.com/?a=1&b=2&c=3#tag";
wl(saferemovequeryfromurl("a",s));
wl(saferemovequeryfromurl("b",s));
wl(saferemovequeryfromurl("c",s));
wl(safeaddquerytourl("d","new",s));
wl(safeaddquerytourl("a","newvalue",s));
// 输出如下:
// http://www.cnblogs.com/?b=2&c=3#tag
// http://www.cnblogs.com/?a=1&c=3#tag
// http://www.cnblogs.com/?a=1&b=2#tag
// http://www.cnblogs.com/?a=1&b=2&c=3&d=new#tag
// http://www.cnblogs.com/?a=newvalue&b=2&c=3#tag
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