blocks|key|2609|text|如果您使用的是ASP.NET+Core1或2，则可以使用Microsoft.AspNetCore.WebUtilities包中的Microsoft.AspNetCore.WebUtilities.QueryHelpers执行此操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2610|如果您使用的是NugetCore3.0或更高版本，WebUtilities现在是nuget的一部分，不需要单独的ASP.NET包引用。|2611|要将其解析为字典，请执行以下操作：|2612|var+uri+=+new+Uri(context.RedirectUri);
var+queryDictionary+=+Microsoft.AspNetCore.WebUtilities.QueryHelpers.ParseQuery(uri.Query);|code-block|syntax|javascript|2613|注意，与System.Web中的ParseQueryString不同，它在ASP.NET+Core1.x中返回类型为IDictionary<string,+string[]>的字典，在ASP.NET+Core2.x或更高版本中返回IDictionary<string,+StringValues>类型的字典，因此该值是一个字符串集合。这就是字典处理同名的多个查询字符串参数的方式。|2614|如果要将参数添加到查询字符串中，可以在QueryHelpers上使用其他方法|2615|var+parametersToAdd+=+new+System.Collections.Generic.Dictionary<string,+string>+{+{+"resource",+"foo"+}+};
var+someUrl+=+"http://www.google.com";
var+newUri+=+Microsoft.AspNetCore.WebUtilities.QueryHelpers.AddQueryString(someUrl,+parametersToAdd);|2616|2617|使用.net+Core2.2，您可以使用以下命令获取查询字符串|2618|var+request+=+HttpContext.Request;
var+query+=+request.Query;
foreach+(var+item+in+query){
+++Debug.WriteLine(item)+
}|2619|您将获得一个键:值对的集合，如下所示|2620|[0]+{[companyName,+]}
[1]+{[shop,+]}
[2]+{[breath,+]}
[3]+{[hand,+]}
[4]+{[eye,+]}
[5]+{[firstAid,+]}
[6]+{[eyeCleaner,+]}|2621|entityMap|0|LINK|mutability|MUTABLE|url|https://www.nuget.org/packages/Microsoft.AspNetCore.WebUtilities/^0|1S|1A|S|X|0|0|P|C|0|0|0|G|G|1M|T|37|X|0|J|C|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|F|3|G|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1K|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1L|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1T|8|@$9|1U|A|1V|B|C]]|D|@]|E|$]]|$1|S|3|T|5|L|7|1W|8|@]|D|@]|E|$M|N]]|$1|U|3|-4|5|6|7|1X|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|X|3|Y|5|L|7|1Z|8|@]|D|@]|E|$M|N]]|$1|Z|3|10|5|6|7|20|8|@]|D|@]|E|$]]|$1|11|3|12|5|L|7|21|8|@]|D|@]|E|$M|N]]|$1|13|3|-4|5|6|7|22|8|@]|D|@]|E|$]]]|14|$15|$5|16|17|18|E|$19|1A]]]]

If you are using ASP.NET Core 1 or 2, you can do this with <code>Microsoft.AspNetCore.WebUtilities.QueryHelpers</code> in the <a href="https://www.nuget.org/packages/Microsoft.AspNetCore.WebUtilities/" rel="noreferrer">Microsoft.AspNetCore.WebUtilities</a> package.
If you are using ASP.NET Core 3.0 or greater, <code>WebUtilities</code> is now part of the ASP.NET SDK and does not require a separate nuget package reference.
To parse it into a dictionary:
<pre><code>var uri = new Uri(context.RedirectUri);
var queryDictionary = Microsoft.AspNetCore.WebUtilities.QueryHelpers.ParseQuery(uri.Query);
</code></pre>
Note that unlike <code>ParseQueryString</code> in System.Web, this returns a dictionary of type <code>IDictionary&lt;string, string[]&gt;</code> in ASP.NET Core 1.x, or <code>IDictionary&lt;string, StringValues&gt;</code> in ASP.NET Core 2.x or greater, so the value is a collection of strings. This is how the dictionary handles multiple query string parameters with the same name.
If you want to add a parameter on to the query string, you can use another method on <code>QueryHelpers</code>:
<pre><code>var parametersToAdd = new System.Collections.Generic.Dictionary&lt;string, string&gt; { { &quot;resource&quot;, &quot;foo&quot; } };
var someUrl = &quot;http://www.google.com&quot;;
var newUri = Microsoft.AspNetCore.WebUtilities.QueryHelpers.AddQueryString(someUrl, parametersToAdd);
</code></pre>
<hr />
Using .net core 2.2 you can get the query string using
<pre><code>var request = HttpContext.Request;
var query = request.Query;
foreach (var item in query){
 Debug.WriteLine(item) 
}
</code></pre>
You will get a collection of key:value pairs - like this
<pre><code>[0] {[companyName, ]}
[1] {[shop, ]}
[2] {[breath, ]}
[3] {[hand, ]}
[4] {[eye, ]}
[5] {[firstAid, ]}
[6] {[eyeCleaner, ]}
</code></pre>

blocks|key|2686|text|HttpRequest有一个Query属性，它通过IReadableStringCollection接口公开解析后的查询字符串：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2687|///+<summary>
///+Gets+the+query+value+collection+parsed+from+owin.RequestQueryString.
///+</summary>
///+<returns>The+query+value+collection+parsed+from+owin.RequestQueryString.</returns>
public+abstract+IReadableStringCollection+Query+{+get;+}|code-block|syntax|javascript|2688|GitHub上的This+discussion也指出了这一点。|2689|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/aspnet/HttpAbstractions/blob/5bce14068164c47ce2ad12fe3354246201184bbe/src/Microsoft.AspNet.Http.Abstractions/HttpRequest.cs|1|https://github.com/aspnet/HttpAbstractions/blob/5bce14068164c47ce2ad12fe3354246201184bbe/src/Microsoft.AspNet.Http.Abstractions/IReadableStringCollection.cs|2|https://github.com/aspnet/HttpAbstractions/issues/288^0|0|B|E|5|P|P|0|B|0|P|P|1|0|0|8|F|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]|$9|18|A|19|1|1A]]|E|$]]|$1|F|3|G|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|M|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]|W|$5|P|Q|R|E|$S|X]]]]

<a href="https://github.com/aspnet/HttpAbstractions/blob/5bce14068164c47ce2ad12fe3354246201184bbe/src/Microsoft.AspNet.Http.Abstractions/HttpRequest.cs" rel="noreferrer"><code>HttpRequest</code></a> has a <code>Query</code> property which exposes the parsed query string via the <a href="https://github.com/aspnet/HttpAbstractions/blob/5bce14068164c47ce2ad12fe3354246201184bbe/src/Microsoft.AspNet.Http.Abstractions/IReadableStringCollection.cs" rel="noreferrer"><code>IReadableStringCollection</code></a> interface:

<pre><code>/// &lt;summary&gt;
/// Gets the query value collection parsed from owin.RequestQueryString.
/// &lt;/summary&gt;
/// &lt;returns&gt;The query value collection parsed from owin.RequestQueryString.&lt;/returns&gt;
public abstract IReadableStringCollection Query { get; }
</code></pre>

<a href="https://github.com/aspnet/HttpAbstractions/issues/288" rel="noreferrer">This discussion</a> on GitHub points to it as well.

blocks|key|2773|text|获取绝对URI并仅使用ASP.NET核心包操作其查询字符串的最简单、最直观的方法只需几个简单的步骤即可完成：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2774|安装程序包|2775|PM>+Install-Package+Microsoft.AspNetCore.WebUtilities|offset|length|2776|PM>+Install-Package+Microsoft.AspNetCore.Http.Extensions|2777|重要类|2778|这里是我们将使用的两个重要类：QueryHelpers、StringValues和QueryBuilder。|2779|《守则》|2780|//+Raw+URI+including+query+string+with+multiple+parameters
var+rawurl+=+"https://bencull.com/some/path?key1=val1&key2=val2&key2=valdouble&key3=";

//+Parse+URI,+and+grab+everything+except+the+query+string.
var+uri+=+new+Uri(rawurl);
var+baseUri+=+uri.GetComponents(UriComponents.Scheme+%7C+UriComponents.Host+%7C+UriComponents.Port+%7C+UriComponents.Path,+UriFormat.UriEscaped);

//+Grab+just+the+query+string+part
var+query+=+QueryHelpers.ParseQuery(uri.Query);

//+Convert+the+StringValues+into+a+list+of+KeyValue+Pairs+to+make+it+easier+to+manipulate
var+items+=+query.SelectMany(x+=>+x.Value,+(col,+value)+=>+new+KeyValuePair<string,+string>(col.Key,+value)).ToList();

//+At+this+point+you+can+remove+items+if+you+want
items.RemoveAll(x+=>+x.Key+==+"key3");+//+Remove+all+values+for+key
items.RemoveAll(x+=>+x.Key+==+"key2"+&&+x.Value+==+"val2");+//+Remove+specific+value+for+key

//+Use+the+QueryBuilder+to+add+in+new+items+in+a+safe+way+(handles+multiples+and+empty+values)
var+qb+=+new+QueryBuilder(items);
qb.Add("nonce",+"testingnonce");
qb.Add("payerId",+"pyr_");

//+Reconstruct+the+original+URL+with+new+query+string
var+fullUri+=+baseUri+%2B+qb.ToQueryString();|code-block|syntax|javascript|2781|要及时了解任何更改，您可以在此处查看我的博客帖子：http://benjii.me/2017/04/parse-modify-query-strings-asp-net-core/|2782|entityMap|0|LINK|mutability|MUTABLE|url|https://www.nuget.org/packages/Microsoft.AspNetCore.WebUtilities|1|https://www.nuget.org/packages/Microsoft.AspNetCore.Http.Extensions|2|https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.aspnetcore.webutilities.queryhelpers|3|https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.extensions.primitives.stringvalues|4|https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.aspnetcore.http.extensions.querybuilder|5|http://benjii.me/2017/04/parse-modify-query-strings-asp-net-core/^0|0|0|0|1H|0|0|0|1K|1|0|0|F|C|2|S|C|3|15|C|4|0|0|0|P|1T|5|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1F|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1G|8|@]|9|@$F|1H|G|1I|1|1J]]|A|$]]|$1|H|3|I|5|6|7|1K|8|@]|9|@$F|1L|G|1M|1|1N]]|A|$]]|$1|J|3|K|5|6|7|1O|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1P|8|@]|9|@$F|1Q|G|1R|1|1S]|$F|1T|G|1U|1|1V]|$F|1W|G|1X|1|1Y]]|A|$]]|$1|N|3|O|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|20|8|@]|9|@]|A|$S|T]]|$1|U|3|V|5|6|7|21|8|@]|9|@$F|22|G|23|1|24]]|A|$]]|$1|W|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]|14|$5|Z|10|11|A|$12|15]]|16|$5|Z|10|11|A|$12|17]]|18|$5|Z|10|11|A|$12|19]]|1A|$5|Z|10|11|A|$12|1B]]|1C|$5|Z|10|11|A|$12|1D]]]]

The easiest and most intuitive way to take an absolute URI and manipulate it's query string using ASP.NET Core packages only, can be done in a few easy steps:

<h3>Install Packages</h3>

<a href="https://www.nuget.org/packages/Microsoft.AspNetCore.WebUtilities" rel="noreferrer">PM> Install-Package Microsoft.AspNetCore.WebUtilities</a> 
<a href="https://www.nuget.org/packages/Microsoft.AspNetCore.Http.Extensions" rel="noreferrer">PM> Install-Package Microsoft.AspNetCore.Http.Extensions</a> 

<h3>Important Classes</h3>

Just to point them out, here are the two important classes we'll be using: <a href="https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.aspnetcore.webutilities.queryhelpers" rel="noreferrer">QueryHelpers</a>, <a href="https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.extensions.primitives.stringvalues" rel="noreferrer">StringValues</a>, <a href="https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.aspnetcore.http.extensions.querybuilder" rel="noreferrer">QueryBuilder</a>.

<h3>The Code</h3>

<pre><code>// Raw URI including query string with multiple parameters
var rawurl = "https://bencull.com/some/path?key1=val1&amp;key2=val2&amp;key2=valdouble&amp;key3=";

// Parse URI, and grab everything except the query string.
var uri = new Uri(rawurl);
var baseUri = uri.GetComponents(UriComponents.Scheme | UriComponents.Host | UriComponents.Port | UriComponents.Path, UriFormat.UriEscaped);

// Grab just the query string part
var query = QueryHelpers.ParseQuery(uri.Query);

// Convert the StringValues into a list of KeyValue Pairs to make it easier to manipulate
var items = query.SelectMany(x =&gt; x.Value, (col, value) =&gt; new KeyValuePair&lt;string, string&gt;(col.Key, value)).ToList();

// At this point you can remove items if you want
items.RemoveAll(x =&gt; x.Key == "key3"); // Remove all values for key
items.RemoveAll(x =&gt; x.Key == "key2" &amp;&amp; x.Value == "val2"); // Remove specific value for key

// Use the QueryBuilder to add in new items in a safe way (handles multiples and empty values)
var qb = new QueryBuilder(items);
qb.Add("nonce", "testingnonce");
qb.Add("payerId", "pyr_");

// Reconstruct the original URL with new query string
var fullUri = baseUri + qb.ToQueryString();
</code></pre>

To keep up to date with any changes, you can check out my blog post about this here: <a href="http://benjii.me/2017/04/parse-modify-query-strings-asp-net-core/" rel="noreferrer">http://benjii.me/2017/04/parse-modify-query-strings-asp-net-core/</a>

blocks|key|4510310|text|值得注意的是，自从顶部答案被标记为正确以来，Microsoft.AspNetCore.WebUtilities已经有了一个主要的版本更新(从1.x.x到2.x.x)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4510311|也就是说，如果您是在netcoreapp1.1上构建，则需要运行以下命令，该命令将安装最新的受支持版本1.1.2|4510312|Install-Package+Microsoft.AspNetCore.WebUtilities+-Version+1.1.2|4510313|entityMap^0|M|X|0|A|D|1F|5|0|0|1S|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

It's important to note that in the time since the top answer has been flagged as correct that <code>Microsoft.AspNetCore.WebUtilities</code> has had a major version update (from 1.x.x to 2.x.x).

That said, if you're building against <code>netcoreapp1.1</code> you will need to run the following, which installs the latest supported version <code>1.1.2</code>:

<code>Install-Package Microsoft.AspNetCore.WebUtilities -Version 1.1.2</code>

blocks|key|4510347|text|此函数返回Dictionary<string,+string>，并且不使用Microsoft.xxx以实现兼容性|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4510348|接受两端的参数编码|4510349|接受重复的键(返回最后一个值)|4510350|var+rawurl+=+"https://emp.com/some/path?key1.name=a%2520line%2520with%253D&key2=val2&key2=valdouble&key3=&key%25204=44#book1";
var+uri+=+new+Uri(rawurl);
Dictionary<string,+string>+queryString+=+ParseQueryString(uri.Query);

//+queryString+return:
//+key1.name,+a+line+with=
//+key2,+valdouble
//+key3,+
//+key+4,+44

public+Dictionary<string,+string>+ParseQueryString(string+requestQueryString)
{
++++Dictionary<string,+string>+rc+=+new+Dictionary<string,+string>();
++++string[]+ar1+=+requestQueryString.Split(new+char[]+{+'&',+'?'+});
++++foreach+(string+row+in+ar1)
++++{
++++++++if+(string.IsNullOrEmpty(row))+continue;
++++++++int+index+=+row.IndexOf('=');
++++++++if+(index+<+0)+continue;
++++++++rc[Uri.UnescapeDataString(row.Substring(0,+index))]+=+Uri.UnescapeDataString(row.Substring(index+%2B+1));+//+use+Unescape+only+parts++++++++++
+++++}
+++++return+rc;
}|code-block|syntax|javascript|4510351|entityMap^0|5|Q|11|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|X|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

This function return <code>Dictionary&lt;string, string&gt;</code> and does not use <code>Microsoft.xxx</code> for compatibility

Accepts parameter encoding in both sides

Accepts duplicate keys (return last value)

<pre><code>var rawurl = "https://emp.com/some/path?key1.name=a%20line%20with%3D&amp;key2=val2&amp;key2=valdouble&amp;key3=&amp;key%204=44#book1";
var uri = new Uri(rawurl);
Dictionary&lt;string, string&gt; queryString = ParseQueryString(uri.Query);

// queryString return:
// key1.name, a line with=
// key2, valdouble
// key3, 
// key 4, 44

public Dictionary&lt;string, string&gt; ParseQueryString(string requestQueryString)
{
 Dictionary&lt;string, string&gt; rc = new Dictionary&lt;string, string&gt;();
 string[] ar1 = requestQueryString.Split(new char[] { '&amp;', '?' });
 foreach (string row in ar1)
 {
 if (string.IsNullOrEmpty(row)) continue;
 int index = row.IndexOf('=');
 if (index &lt; 0) continue;
 rc[Uri.UnescapeDataString(row.Substring(0, index))] = Uri.UnescapeDataString(row.Substring(index + 1)); // use Unescape only parts 
 }
 return rc;
}
</code></pre>

blocks|key|2880|text|我使用这个作为扩展方法，可以使用任意数量的参数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2881|public+static+string+AddOrReplaceQueryParameter(this+HttpContext+c,+params+string[]+nameValues)
++++{
++++++++if+(nameValues.Length%252!=0)
++++++++{
++++++++++++throw+new+Exception("nameValues:+has+more+parameters+then+values+or+more+values+then+parameters");
++++++++}
++++++++var+qps+=+new+Dictionary<string,+StringValues>();
++++++++for+(int+i+=+0;+i+<+nameValues.Length;+i%2B=2)
++++++++{
++++++++++++qps.Add(nameValues[i],+nameValues[i+%2B+1]);
++++++++}
++++++++return+c.AddOrReplaceQueryParameters(qps);
++++}

public+static+string+AddOrReplaceQueryParameters(this+HttpContext+c,+Dictionary<string,StringValues>+pvs)
++++{
++++++++var+request+=+c.Request;
++++++++UriBuilder+uriBuilder+=+new+UriBuilder
++++++++{
++++++++++++Scheme+=+request.Scheme,
++++++++++++Host+=+request.Host.Host,
++++++++++++Port+=+request.Host.Port+??+0,
++++++++++++Path+=+request.Path.ToString(),
++++++++++++Query+=+request.QueryString.ToString()
++++++++};

++++++++var+queryParams+=+QueryHelpers.ParseQuery(uriBuilder.Query);

++++++++foreach+(var+(p,v)+in+pvs)
++++++++{
++++++++++++queryParams.Remove(p);
++++++++++++queryParams.Add(p,+v);
++++++++}

++++++++uriBuilder.Query+=+"";
++++++++var+allQPs+=+queryParams.ToDictionary(k+=>+k.Key,+k+=>+k.Value.ToString());
++++++++var+url+=+QueryHelpers.AddQueryString(uriBuilder.ToString(),allQPs);

++++++++return+url;
++++}|code-block|syntax|javascript|2882|例如，视图中的Next和prev链接：|2883|var+next+=+Context.Request.HttpContext.AddOrReplaceQueryParameter("page",Model.PageIndex%2B1%2B"");

var+prev+=+Context.Request.HttpContext.AddOrReplaceQueryParameter("page",Model.PageIndex-1%2B"");|2884|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I use this as extention method, works with any number of params:

<pre><code>public static string AddOrReplaceQueryParameter(this HttpContext c, params string[] nameValues)
 {
 if (nameValues.Length%2!=0)
 {
 throw new Exception("nameValues: has more parameters then values or more values then parameters");
 }
 var qps = new Dictionary&lt;string, StringValues&gt;();
 for (int i = 0; i &lt; nameValues.Length; i+=2)
 {
 qps.Add(nameValues[i], nameValues[i + 1]);
 }
 return c.AddOrReplaceQueryParameters(qps);
 }

public static string AddOrReplaceQueryParameters(this HttpContext c, Dictionary&lt;string,StringValues&gt; pvs)
 {
 var request = c.Request;
 UriBuilder uriBuilder = new UriBuilder
 {
 Scheme = request.Scheme,
 Host = request.Host.Host,
 Port = request.Host.Port ?? 0,
 Path = request.Path.ToString(),
 Query = request.QueryString.ToString()
 };

 var queryParams = QueryHelpers.ParseQuery(uriBuilder.Query);

 foreach (var (p,v) in pvs)
 {
 queryParams.Remove(p);
 queryParams.Add(p, v);
 }

 uriBuilder.Query = "";
 var allQPs = queryParams.ToDictionary(k =&gt; k.Key, k =&gt; k.Value.ToString());
 var url = QueryHelpers.AddQueryString(uriBuilder.ToString(),allQPs);

 return url;
 }

</code></pre>

Next and prev links for example in a view:

<pre><code>var next = Context.Request.HttpContext.AddOrReplaceQueryParameter("page",Model.PageIndex+1+"");

var prev = Context.Request.HttpContext.AddOrReplaceQueryParameter("page",Model.PageIndex-1+"");
</code></pre>

I am given an absolute URI that contains a query string. I'm looking to safely append a value to the query string, and change an existing parameter.

I would prefer not to tack on <code>&amp;foo=bar</code>, or use regular expressions, URI escaping is tricky. Rather I want to use a built-in mechanism that I know will do this correctly and handle the escaping.

I've <a href="https://stackoverflow.com/a/17096289/492405">found</a> <a href="https://stackoverflow.com/q/10232034/492405">a</a> <a href="https://stackoverflow.com/questions/11956948/easiest-way-to-parse-querystring-formatted-data">ton</a> of answers that all use <code>HttpUtility</code>. However this being ASP.NET Core, there is no more System.Web assembly anymore, thus no more <code>HttpUtility</code>.

What is the appropriate way to do this in ASP.NET Core while targeting the core runtime?

Parse and modify a query string in .NET Core

GitHub

我得到了一个包含查询字符串的绝对URI。我希望安全地将一个值附加到查询字符串，并更改现有的参数。我不喜欢使用&foo=bar，或者使用正则表达式，URI转义是很棘手的。相反，我想使用一种内置的机制，我知道这样做是正确的，并且可以处理转义。I‘s    of answers that all use HttpUtilit...

问在.NET核心中解析和修改查询字符串
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