C# 如何有效地从Url中按键删除查询字符串？
如何按键从Url中删除查询字符串 我有下面的方法，效果很好，但只是想知道有没有更好/更短的方法？或者是一个内置的.NET方法，它可以更有效地完成这项工作C# 如何有效地从Url中按键删除查询字符串？,c#,.net,regex,url,query-string,C#,.net,Regex,Url,Query String,如何按键从Url中删除查询字符串 我有下面的方法，效果很好，但只是想知道有没有更好/更短的方法？或者是一个内置的.NET方法，它可以更有效地完成这项工作 public static string RemoveQueryStringByKey(string url, string key) { var indexOfQuestionMark = url.IndexOf("?"); if (indexOfQuestionMark ==
public static string RemoveQueryStringByKey(string url, string key)
{
var indexOfQuestionMark = url.IndexOf("?");
if (indexOfQuestionMark == -1)
{
return url;
}
var result = url.Substring(0, indexOfQuestionMark);
var queryStrings = url.Substring(indexOfQuestionMark + 1);
var queryStringParts = queryStrings.Split(new [] {'&'});
var isFirstAdded = false;
for (int index = 0; index <queryStringParts.Length; index++)
{
var keyValue = queryStringParts[index].Split(new char[] { '=' });
if (keyValue[0] == key)
{
continue;
}
if (!isFirstAdded)
{
result += "?";
isFirstAdded = true;
}
else
{
result += "&";
}
result += queryStringParts[index];
}
return result;
}
var queryString = "hello=hi&xpid=4578";
var qs = System.Web.HttpUtility.ParseQueryString(queryString);
qs.Remove("xpid");
var newQuerystring = qs.ToString();
string RemoveQueryStringByKey(string url, string key)
{
string ret = string.Empty;
int index = url.IndexOf(key);
if (index > -1)
{
string post = string.Empty;
// Find end of key's value
int endIndex = url.IndexOf('&', index);
if (endIndex != -1) // Last query string value?
{
post = url.Substring(endIndex, url.Length - endIndex);
}
// Decrement for ? or & character
--index;
ret = url.Substring(0, index) + post;
}
return ret;
}
我找到了一种不用正则表达式的方法：
private string RemoveQueryStringByKey(string sURL, string sKey) {
string sOutput = string.Empty;
int iQuestion = sURL.IndexOf('?');
if (iQuestion == -1) return (sURL);
int iKey = sURL.Substring(iQuestion).IndexOf(sKey) + iQuestion;
if (iKey == -1) return (sURL);
int iNextAnd = sURL.Substring(iKey).IndexOf('&') + iKey + 1;
if (iNextAnd == -1) {
sOutput = sURL.Substring(0, iKey - 1);
}
else {
sOutput = sURL.Remove(iKey, iNextAnd - iKey);
}
return (sOutput);
}
我确实尝试过在末尾添加另一个字段，而且效果也不错。我认为最短的方法（我相信在所有情况下都会生成有效的URL，假设URL一开始是有效的）是使用这个正则表达式（其中
getRidOf“ INPUT OUTPUT
----------- ------------
blah.com/blah.php?getRidOf=d.co&blah=foo blah.com/blah.php?blah=foo
blah.com/blah.php?f=0&getRidOf=d.co&blah=foo blah.com/blah.php?f=0&blah=foo
blah.com/blah.php?hello=true&getRidOf=d.co blah.com/blah.php?hello=true&
blah.com/blah.php?getRidOf=d.co blah.com/blah.php?
Dim RegexObj as Regex = New Regex("(?<=[?&])getRidOf=[^&]*(&|$)")
RegexObj.Replace("source.url.com/find.htm?replace=true&getRidOf=PLEASE!!!", "")
replacetruetrue&public static string RemoveQueryStringByKey(string url, string key)
{
var uri = new Uri(url);
// this gets all the query string key value pairs as a collection
var newQueryString = HttpUtility.ParseQueryString(uri.Query);
// this removes the key if exists
newQueryString.Remove(key);
// this gets the page path from root without QueryString
string pagePathWithoutQueryString = uri.GetLeftPart(UriPartial.Path);
return newQueryString.Count > 0
? String.Format("{0}?{1}", pagePathWithoutQueryString, newQueryString)
: pagePathWithoutQueryString;
}
RemoveQueryStringByKey("https://www.google.co.uk/search?#hl=en&output=search&sclient=psy-ab&q=cookie", "q");
https://www.google.co.uk/search?#hl=en&output=search&sclient=psy-ab
在删除
查询字符串之前，请在下面输入代码
PropertyInfo isreadonly =
typeof(System.Collections.Specialized.NameValueCollection).GetProperty(
"IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
// make collection editable
isreadonly.SetValue(this.Request.QueryString, false, null);
// remove
this.Request.QueryString.Remove("yourKey");
publicstaticstringremoveQueryStringByKey（stringsurl，stringskey）
{
string sOutput=string.Empty；
string sToReplace=string.Empty；
int-iFindTheKey=sURL.IndexOf（sKey）；
如果（iFindTheKey==-1）返回（sURL）；
intiquestion=sURL.IndexOf（‘？’）；
如果（iQuestion==-1）返回（sURL）；
字符串sEverythingBehindQ=sURL.Substring（iQuestion）；
List everythingBehindQ=新列表（sEverythingBehindQ.Split（“&”）；
foreach（everythingBehindQ中的字符串OneParamPair）
{
int iIsKeyInThisParamPair=OneParamPair.IndexOf（sKey）；
如果（iIsKeyInThisParamPair！=-1）
{
sToReplace=“&”+OneParamPair；
}
}
sOutput=表面替换（存储位置“”）；
返回（sOutput）；
}
很抱歉，这有点脏，但应该在旧的框架中工作
public String RemoveQueryString( String rawUrl , String keyName)
{
var currentURL_Split = rawUrl.Split('&').ToList();
currentURL_Split = currentURL_Split.Where(o => !o.ToLower().StartsWith(keyName.ToLower()+"=")).ToList();
String New_RemovedKey = String.Join("&", currentURL_Split.ToArray());
New_RemovedKey = New_RemovedKey.Replace("&&", "&");
return New_RemovedKey;
}
以下是我的解决方案：
我添加了一些额外的输入验证
public static void TryRemoveQueryStringByKey(ref string url, string key)
{
if (string.IsNullOrEmpty(url) ||
string.IsNullOrEmpty(key) ||
Uri.IsWellFormedUriString(url, UriKind.RelativeOrAbsolute) == false)
{
return false;
}
try
{
Uri uri = new Uri(url);
// This gets all the query string key value pairs as a collection
NameValueCollection queryCollection = HttpUtility.ParseQueryString(uri.Query);
string keyValue = queryCollection.Get(key);
if (url.IndexOf("&" + key + "=" + keyValue, StringComparison.OrdinalIgnoreCase) >= 0)
{
url = url.Replace("&" + key + "=" + keyValue, String.Empty);
return true;
}
else if (url.IndexOf("?" + key + "=" + keyValue, StringComparison.OrdinalIgnoreCase) >= 0)
{
url = url.Replace("?" + key + "=" + keyValue, String.Empty);
return true;
}
else
{
return false;
}
}
catch
{
return false;
}
}
一些单元测试示例：
string url1 = "http://www.gmail.com?a=1&cookie=cookieValue"
Assert.IsTrue(TryRemoveQueryStringByKey(ref url1,"cookie")); //OUTPUT: "http://www.gmail.com?a=1"
string url2 = "http://www.gmail.com?cookie=cookieValue"
Assert.IsTrue(TryRemoveQueryStringByKey(ref url2,"cookie")); //OUTPUT: "http://www.gmail.com"
string url3 = "http://www.gmail.com?cookie="
Assert.IsTrue(TryRemoveQueryStringByKey(ref url2,"cookie")); //OUTPUT: "http://www.gmail.com"
我们也可以使用正则表达式来实现
string queryString = "Default.aspx?Agent=10&Language=2"; //Request.QueryString.ToString();
string parameterToRemove="Language"; //parameter which we want to remove
string regex=string.Format("(&{0}=[^&\s]+|(?<=\?){0}=[^&\s]+&?)",parameterToRemove); //this will not work for javascript, for javascript you can do following
string finalQS = Regex.Replace(queryString, regex, "");
//javascript(following is not js syntex, just want to give idea how we can able do it in js)
string regex1 = string.Format("(&{0}=[^&\s]+)",parameterToRemove);
string regex2 = string.Format("(\?{0}=[^&\s]+&?)",parameterToRemove);
string finalQS = Regex.Replace(queryString, regex1, "").Replace(queryString, regex2, "");
string queryString=“Default.aspx？Agent=10&Language=2”//Request.QueryString.ToString（）；
字符串参数toremove=“Language”//要删除的参数
string regex=string.Format（“（&{0}=[^&\s]+|）（？在系统名称空间中调用了一个有用的类。我们可以将它与几个扩展方法一起使用来执行以下操作：
Uri u = new Uri("http://example.com?key1=value1&key2=value2");
u = u.DropQueryItem("key1");
或者像这样：
Uri u = new Uri("http://example.com?key1=value1&key2=value2");
UriBuilder b = new UriBuilder(u);
b.RemoveQueryItem("key1");
u = b.Uri;
扩展方法：
using System;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
public static class UriExtensions
{
public static Uri DropQueryItem(this Uri u, string key)
{
UriBuilder b = new UriBuilder(u);
b.RemoveQueryItem(key);
return b.Uri;
}
}
public static class UriBuilderExtensions
{
private static string _ParseQueryPattern = @"(?<key>[^&=]+)={0,1}(?<value>[^&]*)";
private static Regex _ParseQueryRegex = null;
private static Regex ParseQueryRegex
{
get
{
if (_ParseQueryRegex == null)
{
_ParseQueryRegex = new Regex(_ParseQueryPattern, RegexOptions.Compiled | RegexOptions.Singleline);
}
return _ParseQueryRegex;
}
}
public static void SetQueryItem(this UriBuilder b, string key, string value)
{
NameValueCollection parms = ParseQueryString(b.Query);
parms[key] = value;
b.Query = RenderQuery(parms);
}
public static void RemoveQueryItem(this UriBuilder b, string key)
{
NameValueCollection parms = ParseQueryString(b.Query);
parms.Remove(key);
b.Query = RenderQuery(parms);
}
private static string RenderQuery(NameValueCollection parms)
{
StringBuilder sb = new StringBuilder();
for (int i=0; i<parms.Count; i++)
{
string key = parms.Keys[i];
sb.Append(key + "=" + parms[key]);
if (i < parms.Count - 1)
{
sb.Append("&");
}
}
return sb.ToString();
}
public static NameValueCollection ParseQueryString(string query, bool caseSensitive = true)
{
NameValueCollection pairs = new NameValueCollection(caseSensitive ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase);
string q = query.Trim().TrimStart(new char[] {'?'});
MatchCollection matches = ParseQueryRegex.Matches(q);
foreach (Match m in matches)
{
string key = m.Groups["key"].Value;
string value = m.Groups["value"].Value;
if (pairs[key] != null)
{
pairs[key] = pairs[key] + "," + value;
}
else
{
pairs[key] = value;
}
}
return pairs;
}
}
使用系统；
使用System.Collections.Specialized；
使用系统文本；
使用System.Text.RegularExpressions；
公共静态类扩展
{
公共静态Uri DropQueryItem（此Uri u，字符串键）
{
UriBuilder b=新的UriBuilder（u）；
b、 RemoveQueryItem（键）；
返回b.Uri；
}
}
公共静态类UriBuilderExtensions
{
私有静态字符串_ParseQueryPattern=@“（？[^&=]+）={0,1}（？[^&]*）”；
私有静态正则表达式_ParseQueryRegex=null；
私有静态正则表达式ParseQueryRegex
{
得到
{
if（_ParseQueryRegex==null）
{
_ParseQueryRegex=新正则表达式（_ParseQueryPattern，RegexOptions.Compiled | RegexOptions.Singleline）；
}
返回_ParseQueryRegex；
}
}
公共静态void SetQueryItem（此UriBuilder b，字符串键，字符串值）
{
NameValueCollection parms=ParseQueryString（b.Query）；
parms[key]=值；
b、 Query=RenderQuery（parms）；
}
公共静态void RemoveQueryItem（此UriBuilder b，字符串键）
{
NameValueCollection parms=ParseQueryString（b.Query）；
parms.Remove（键）；
b、 Query=RenderQuery（parms）；
}
私有静态字符串RenderQuery（NameValueCollection参数）
{
StringBuilder sb=新的StringBuilder（）；
对于（int i=0；i，这里有一个完整的解决方案，可以使用>=0指定的参数和任何形式的URL：
/// <summary>
/// Given a URL in any format, return URL with specified query string param removed if it exists
/// </summary>
public static string StripQueryStringParam(string url, string paramToRemove)
{
return StripQueryStringParams(url, new List<string> {paramToRemove});
}
/// <summary>
/// Given a URL in any format, return URL with specified query string params removed if it exists
/// </summary>
public static string StripQueryStringParams(string url, List<string> paramsToRemove)
{
if (paramsToRemove == null || !paramsToRemove.Any()) return url;
var splitUrl = url.Split('?');
if (splitUrl.Length == 1) return url;
var urlFirstPart = splitUrl[0];
var urlSecondPart = splitUrl[1];
// Even though in most cases # isn't available to context,
// we may be passing it in explicitly for helper urls
var secondPartSplit = urlSecondPart.Split('#');
var querystring = secondPartSplit[0];
var hashUrlPart = string.Empty;
if (secondPartSplit.Length > 1)
{
hashUrlPart = "#" + secondPartSplit[1];
}
var nvc = HttpUtility.ParseQueryString(querystring);
if (!nvc.HasKeys()) return url;
// Remove any matches
foreach (var key in nvc.AllKeys)
{
if (paramsToRemove.Contains(key))
{
nvc.Remove(key);
}
}
if (!nvc.HasKeys()) return urlFirstPart;
return urlFirstPart +
"?" + string.Join("&", nvc.AllKeys.Select(c => c.ToString() + "=" + nvc[c.ToString()])) +
hashUrlPart;
}
//
///给定任何格式的URL，如果存在，则返回URL并删除指定的查询字符串param
///
公共静态字符串StripQueryStringParam（字符串url，字符串参数删除）
{
返回StripQueryStringParams（url，新列表{paramToRemove}）；
}
///
///给定任意格式的URL，返回URL，如果存在，则删除指定的查询字符串参数
///
公共静态字符串StripQueryStringParams（字符串url、列表参数StoreMove）
{
if（paramsToRemove==null | |！paramsToRemove.Any（））返回url；
var splitUrl=url.Split（“？”）；
如果（splitUrl.Length==1）返回url；
var urlFirstPart=splitUrl[0]；
var urlSecondPart=splitUrl[1]；
//尽管在大多数情况下#不适用于上下文，
//我们可能会将其显式地传递给帮助器URL
var secondPartSplit=urlsecondapart.Split（“#”）；
var querystring=secondPartSplit[0]；
var hashUrlPart=string.Empty；
如果（secondPartSplit.Length>1）
{
hashUrlPart=“#”+secondPartSplit[1]；
}
var nvc=HttpUtility.ParseQueryString（querystring）；
如果（！nvc.HasKeys（））返回url；
//删除任何匹配项
foreach（nvc.AllKeys中的变量键）
{
if（paramsToRemove.Contains（键））
{
移除（钥匙）；
}
}
如果（！nvc.HasKeys（））返回urlFirstPart；
返回urlFirstPart+
“？”+string.Join（“&”，nvc.AllKeys.Select（c=>c.ToString（）+”=“+nvc[c.ToString（）]））+
哈什尔部分；
}
这个老问题的更现代的答案，以防其他人像我一样偶然发现它
这是使用uric
string url1 = "http://www.gmail.com?a=1&cookie=cookieValue"
Assert.IsTrue(TryRemoveQueryStringByKey(ref url1,"cookie")); //OUTPUT: "http://www.gmail.com?a=1"
string url2 = "http://www.gmail.com?cookie=cookieValue"
Assert.IsTrue(TryRemoveQueryStringByKey(ref url2,"cookie")); //OUTPUT: "http://www.gmail.com"
string url3 = "http://www.gmail.com?cookie="
Assert.IsTrue(TryRemoveQueryStringByKey(ref url2,"cookie")); //OUTPUT: "http://www.gmail.com"
string queryString = "Default.aspx?Agent=10&Language=2"; //Request.QueryString.ToString();
string parameterToRemove="Language"; //parameter which we want to remove
string regex=string.Format("(&{0}=[^&\s]+|(?<=\?){0}=[^&\s]+&?)",parameterToRemove); //this will not work for javascript, for javascript you can do following
string finalQS = Regex.Replace(queryString, regex, "");
//javascript(following is not js syntex, just want to give idea how we can able do it in js)
string regex1 = string.Format("(&{0}=[^&\s]+)",parameterToRemove);
string regex2 = string.Format("(\?{0}=[^&\s]+&?)",parameterToRemove);
string finalQS = Regex.Replace(queryString, regex1, "").Replace(queryString, regex2, "");
Uri u = new Uri("http://example.com?key1=value1&key2=value2");
u = u.DropQueryItem("key1");
Uri u = new Uri("http://example.com?key1=value1&key2=value2");
UriBuilder b = new UriBuilder(u);
b.RemoveQueryItem("key1");
u = b.Uri;
using System;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
public static class UriExtensions
{
public static Uri DropQueryItem(this Uri u, string key)
{
UriBuilder b = new UriBuilder(u);
b.RemoveQueryItem(key);
return b.Uri;
}
}
public static class UriBuilderExtensions
{
private static string _ParseQueryPattern = @"(?<key>[^&=]+)={0,1}(?<value>[^&]*)";
private static Regex _ParseQueryRegex = null;
private static Regex ParseQueryRegex
{
get
{
if (_ParseQueryRegex == null)
{
_ParseQueryRegex = new Regex(_ParseQueryPattern, RegexOptions.Compiled | RegexOptions.Singleline);
}
return _ParseQueryRegex;
}
}
public static void SetQueryItem(this UriBuilder b, string key, string value)
{
NameValueCollection parms = ParseQueryString(b.Query);
parms[key] = value;
b.Query = RenderQuery(parms);
}
public static void RemoveQueryItem(this UriBuilder b, string key)
{
NameValueCollection parms = ParseQueryString(b.Query);
parms.Remove(key);
b.Query = RenderQuery(parms);
}
private static string RenderQuery(NameValueCollection parms)
{
StringBuilder sb = new StringBuilder();
for (int i=0; i<parms.Count; i++)
{
string key = parms.Keys[i];
sb.Append(key + "=" + parms[key]);
if (i < parms.Count - 1)
{
sb.Append("&");
}
}
return sb.ToString();
}
public static NameValueCollection ParseQueryString(string query, bool caseSensitive = true)
{
NameValueCollection pairs = new NameValueCollection(caseSensitive ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase);
string q = query.Trim().TrimStart(new char[] {'?'});
MatchCollection matches = ParseQueryRegex.Matches(q);
foreach (Match m in matches)
{
string key = m.Groups["key"].Value;
string value = m.Groups["value"].Value;
if (pairs[key] != null)
{
pairs[key] = pairs[key] + "," + value;
}
else
{
pairs[key] = value;
}
}
return pairs;
}
}
/// <summary>
/// Given a URL in any format, return URL with specified query string param removed if it exists
/// </summary>
public static string StripQueryStringParam(string url, string paramToRemove)
{
return StripQueryStringParams(url, new List<string> {paramToRemove});
}
/// <summary>
/// Given a URL in any format, return URL with specified query string params removed if it exists
/// </summary>
public static string StripQueryStringParams(string url, List<string> paramsToRemove)
{
if (paramsToRemove == null || !paramsToRemove.Any()) return url;
var splitUrl = url.Split('?');
if (splitUrl.Length == 1) return url;
var urlFirstPart = splitUrl[0];
var urlSecondPart = splitUrl[1];
// Even though in most cases # isn't available to context,
// we may be passing it in explicitly for helper urls
var secondPartSplit = urlSecondPart.Split('#');
var querystring = secondPartSplit[0];
var hashUrlPart = string.Empty;
if (secondPartSplit.Length > 1)
{
hashUrlPart = "#" + secondPartSplit[1];
}
var nvc = HttpUtility.ParseQueryString(querystring);
if (!nvc.HasKeys()) return url;
// Remove any matches
foreach (var key in nvc.AllKeys)
{
if (paramsToRemove.Contains(key))
{
nvc.Remove(key);
}
}
if (!nvc.HasKeys()) return urlFirstPart;
return urlFirstPart +
"?" + string.Join("&", nvc.AllKeys.Select(c => c.ToString() + "=" + nvc[c.ToString()])) +
hashUrlPart;
}
public static string RemoveQueryStringByKey(string url, string key)
{
var uri = new Uri(url, UriKind.Absolute);
var queryParts = uri.Query
.TrimStart('?')
.Split('&')
.Where(item => string.CompareOrdinal(item, key) != 0);
return uri.Scheme + Uri.SchemeDelimiter
+ uri.Authority
+ uri.AbsolutePath
+ "?" + string.Join("&", queryParts);
}
public Uri GetUriWithoutQueryParam( Uri originalUri, string paramKey ) {
NameValueCollection newQuery = HttpUtility.ParseQueryString( originalUri.Query );
newQuery.Remove( paramKey );
return new UriBuilder( originalUri ) { Query = newQuery.ToString() }.Uri;
}