blocks|key|627342|text|试试这样的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627343|if+(Request.Cookies["userId"]+!=+null)
{
++++Response.Cookies["userId"].Expires+=+DateTime.Now.AddDays(-1);+++
}|code-block|syntax|javascript|627344|但是使用它也是有意义的|627345|Session.Abandon();|627346|此外，在许多情况下。|627347|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Try something like that:

<pre><code>if (Request.Cookies["userId"] != null)
{
 Response.Cookies["userId"].Expires = DateTime.Now.AddDays(-1); 
}
</code></pre>

But it also makes sense to use 

<pre><code>Session.Abandon();
</code></pre>

besides in many scenarios.

blocks|key|843053|text|不幸的是，对我来说，设置"Expires“并不总是有效的。曲奇没有受到影响。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|843054|这段代码对我来说是有效的：|843055|HttpContext.Current.Session.Abandon();
HttpContext.Current.Response.Cookies.Add(new+HttpCookie("ASP.NET_SessionId",+""));|code-block|syntax|javascript|843056|其中"ASP.NET_SessionId"是cookie的名称。这并不是真的删除cookie，而是用一个空白cookie覆盖它，这对我来说已经足够近了。|offset|length|style|CODE|843057|entityMap^0|0|0|0|2|J|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Unfortunately, for me, setting "Expires" did not always work. The cookie was unaffected.

This code did work for me:

<pre><code>HttpContext.Current.Session.Abandon();
HttpContext.Current.Response.Cookies.Add(new HttpCookie("ASP.NET_SessionId", ""));
</code></pre>

where <code>"ASP.NET_SessionId"</code> is the name of the cookie. This does not really delete the cookie, but overrides it with a blank cookie, which was close enough for me.

blocks|key|843141|text|您不应该将密码存储为cookie。要删除cookie，您只需修改它并使其过期。你不能真的删除它，也就是从用户的磁盘中删除它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|843142|下面是一个示例：|843143|HttpCookie+aCookie;
++++string+cookieName;
++++int+limit+=+Request.Cookies.Count;
++++for+(int+i=0;+i<limit;+i%2B%2B)
++++{
++++++++cookieName+=+Request.Cookies[i].Name;
++++++++aCookie+=+new+HttpCookie(cookieName);
++++++++aCookie.Expires+=+DateTime.Now.AddDays(-1);+//+make+it+expire+yesterday
++++++++Response.Cookies.Add(aCookie);+//+overwrite+it
++++}|code-block|syntax|javascript|843144|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You should never store password as a cookie. To delete a cookie, you really just need to modify and expire it. You can't really delete it, ie, remove it from the user's disk. 

Here is a sample:

<pre><code>HttpCookie aCookie;
 string cookieName;
 int limit = Request.Cookies.Count;
 for (int i=0; i&lt;limit; i++)
 {
 cookieName = Request.Cookies[i].Name;
 aCookie = new HttpCookie(cookieName);
 aCookie.Expires = DateTime.Now.AddDays(-1); // make it expire yesterday
 Response.Cookies.Add(aCookie); // overwrite it
 }
</code></pre>

blocks|key|627504|text|这是我使用的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627505|++++private+void+ExpireAllCookies()
++++{
++++++++if+(HttpContext.Current+!=+null)
++++++++{
++++++++++++int+cookieCount+=+HttpContext.Current.Request.Cookies.Count;
++++++++++++for+(var+i+=+0;+i+<+cookieCount;+i%2B%2B)
++++++++++++{
++++++++++++++++var+cookie+=+HttpContext.Current.Request.Cookies[i];
++++++++++++++++if+(cookie+!=+null)
++++++++++++++++{
++++++++++++++++++++var+expiredCookie+=+new+HttpCookie(cookie.Name)+{
++++++++++++++++++++++++Expires+=+DateTime.Now.AddDays(-1),
++++++++++++++++++++++++Domain+=+cookie.Domain
++++++++++++++++++++};
++++++++++++++++++++HttpContext.Current.Response.Cookies.Add(expiredCookie);+//+overwrite+it
++++++++++++++++}
++++++++++++}

++++++++++++//+clear+cookies+server+side
++++++++++++HttpContext.Current.Request.Cookies.Clear();
++++++++}
++++}|code-block|syntax|javascript|627506|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I use:

<pre><code> private void ExpireAllCookies()
 {
 if (HttpContext.Current != null)
 {
 int cookieCount = HttpContext.Current.Request.Cookies.Count;
 for (var i = 0; i &lt; cookieCount; i++)
 {
 var cookie = HttpContext.Current.Request.Cookies[i];
 if (cookie != null)
 {
 var expiredCookie = new HttpCookie(cookie.Name) {
 Expires = DateTime.Now.AddDays(-1),
 Domain = cookie.Domain
 };
 HttpContext.Current.Response.Cookies.Add(expiredCookie); // overwrite it
 }
 }

 // clear cookies server side
 HttpContext.Current.Request.Cookies.Clear();
 }
 }
</code></pre>

blocks|key|627561|text|虽然这是一个老帖子，但我想如果有人还在寻找解决方案的话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627562|HttpCookie+mycookie+=+new+HttpCookie("aa");
mycookie.Expires+=+DateTime.Now.AddDays(-1d);
Response.Cookies.Add(mycookie1);|code-block|syntax|javascript|627563|这就是我成功的原因。|627564|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Though this is an old thread, i thought if someone is still searching for solution in the future. 

<pre><code>HttpCookie mycookie = new HttpCookie("aa");
mycookie.Expires = DateTime.Now.AddDays(-1d);
Response.Cookies.Add(mycookie1);
</code></pre>

Thats what did the trick for me.

blocks|key|627609|text|Response.Cookies"UserSettings".Expires+=+DateTime.Now.AddDays(-1)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627610|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Response.Cookies["UserSettings"].Expires = DateTime.Now.AddDays(-1)

blocks|key|627639|text|现在是2018年，所以在ASP.NET核心中，有一个简单的内置函数。要删除cookie，请尝试以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627640|if(Request.Cookies["aa"]+!=+null)
{
++++Response.Cookies.Delete("aa");
}
return+View();|code-block|syntax|javascript|627641|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It is 2018 now, so in ASP.NET Core, there is a straight forward built in function. To delete a cookie try this code:

<pre><code>if(Request.Cookies["aa"] != null)
{
 Response.Cookies.Delete("aa");
}
return View();
</code></pre>

blocks|key|843407|text|您必须设置过期日期才能删除cookies|type|unstyled|depth|inlineStyleRanges|entityRanges|data|843408|Request.Cookies[yourCookie]?.Expires.Equals(DateTime.Now.AddYears(-1));|code-block|syntax|javascript|843409|如果cookie不存在，这不会抛出异常。|843410|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You have to set the expiration date to delete cookies
<pre><code>Request.Cookies[yourCookie]?.Expires.Equals(DateTime.Now.AddYears(-1));
</code></pre>
This won't throw an exception if the cookie doesn't exist.

In my website when the user clicks on the "Logout" button, the Logout.aspx page loads with code <code>Session.Clear()</code>.

In ASP.NET/C#, does this clear all cookies? Or is there any other code that needs to be added to remove all of the cookies of my website?

How to delete cookies on an ASP.NET website

在我的网站中，当用户点击“注销”按钮时，Logout.aspx页面就会加载代码Session.Clear()。在ASP.NET/C#中，这会清除所有cookie吗？或者是否有任何其他代码需要添加，以删除我网站上的所有cookie？

问如何删除ASP.NET网站上的cookies
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