我很困惑CookieContainer如何处理域，所以我创建了这个测试。 此测试显示cookieContainer不会返回“example.com”的任何cookie，但根据RFC，它应返回至少2个cookie。
这不是一个错误吗？
如何使其发挥作用？
以下是对此错误的讨论：
http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/c4edc965-2dc2-4724-8f08-68815cf1dce6
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Net" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
CookieContainer getContainer()
{
CookieContainer result = new CookieContainer();
Uri uri = new Uri("http://sub.example.com");
string cookieH = @"Test1=val; domain=sub.example.com; path=/";
result.SetCookies(uri, cookieH);
cookieH = @"Test2=val; domain=.example.com; path=/";
result.SetCookies(uri, cookieH);
cookieH = @"Test3=val; domain=example.com; path=/";
result.SetCookies(uri, cookieH);
return result;
}
void Test()
{
CookieContainer cookie = getContainer();
lblResult.Text += "<br>Total cookies count: " + cookie.Count + " expected: 3";
Uri uri = new Uri("http://sub.example.com");
CookieCollection coll = cookie.GetCookies(uri);
lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " expected: 2";
uri = new Uri("http://other.example.com");
coll = cookie.GetCookies(uri);
lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " expected: 2";
uri = new Uri("http://example.com");
coll = cookie.GetCookies(uri);
lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " expected: 2";
}
protected void Page_Load(object sender, EventArgs e)
{
Test();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>CookieContainer Test Page</title>
</head>
<body>
<form id="frmTest" runat="server">
<asp:Label ID="lblResult" EnableViewState="false" runat="server"></asp:Label>
</form>
</body>
</html>
答案 0 :(得分：24)
我刚刚找到了这个bug的修复程序，并在此讨论： http://dot-net-expertise.blogspot.com/2009/10/cookiecontainer-domain-handling-bug-fix.html
以下是解决方案：
每次向容器添加cookie时调用BugFix_CookieDomain 在使用.GetCookie之前或系统使用容器之前。
private void BugFix_CookieDomain(CookieContainer cookieContainer)
{
System.Type _ContainerType = typeof(CookieContainer);
Hashtable table = (Hashtable)_ContainerType.InvokeMember("m_domainTable",
System.Reflection.BindingFlags.NonPublic |
System.Reflection.BindingFlags.GetField |
System.Reflection.BindingFlags.Instance,
null,
cookieContainer,
new object[] { });
ArrayList keys = new ArrayList(table.Keys);
foreach (string keyObj in keys)
{
string key = (keyObj as string);
if (key[0] == '.')
{
string newKey = key.Remove(0, 1);
table[newKey] = table[keyObj];
}
}
}
答案 1 :(得分：0)
答案 2 :(得分：0)
//bug fix, exists only in 3.5 FW, please wrap it with defines
//http://dot-net-expertise.blogspot.com/2009/10/cookiecontainer-domain-handling-bug-fix.html
if(!value.Contains("://www.")) //we are going to hit the bug
{
string urlWWW = value.Replace("://", "://www.");
Uri uriWWW = new Uri(urlWWW);
foreach (Cookie c in _cookieContainer.GetCookies(uriWWW))
if (c.Domain.StartsWith("."))
request.Headers["Cookies"] += c.Name + "=" + c.Value + ";"; //manually add the cookies
}
//~bug fix
答案 3 :(得分：0)
这个问题让我失去了一天。 CallMeLaNN的回复对我没有帮助（我使用的是.Net 4.5）。在我的情况下，问题是设置请求和设置cookie的顺序。
在这种情况下，cookie不会发送到服务器：
var response = (HttpWebRequest)WebRequest.Create("http://localhost:4433/");
using (var requestStream = response.GetRequestStream())
{
using (var streamWriter = new StreamWriter(requestStream))
{
requestStream.Write(RequestContent);
}
}
response.CookieContainer.Add(new Cookie("Name", "Value"));
await response.GetResponseAsync();
要使其正常工作，需要更改订单：
var response = (HttpWebRequest)WebRequest.Create("http://localhost:4433/");
response.CookieContainer.Add(new Cookie("Name", "Value"));
await response.GetResponseAsync();
using (var requestStream = response.GetRequestStream())
{
using (var streamWriter = new StreamWriter(requestStream))
{
requestStream.Write(RequestContent);
}
}
答案 4 :(得分：0)
我已针对此问题创建了一个适用于Windows 10 / UWP / .NET Core应用程序的修复程序。问题是CookieContainer的内部结构不同，但就像它们在.NET Framework中一样糟糕。因此，已接受的解决方案不再适用。
但是我没有“修复”CookieContainer，而是编写了一个GetCookies()的版本，它使用字符串获取特定域的所有Cookie，无论其“安全”状态如何或是以点为前缀。您可以根据自己的需要随意修改它，我将在未来的.NET Core版本中看到它的实现版本。
using System.Collections.Generic;
using System.Reflection;
namespace System.Net
{
/// <summary>
/// Contains extensions for the <see cref="CookieContaner"/> class.
/// </summary>
public static class CookieContainerExtensions
{
/// <summary>
/// Uses Reflection to get ALL of the <see cref="Cookie">Cookies</see> where <see cref="Cookie.Domain"/>
/// contains part of the specified string. Will return cookies for any subdomain, as well as dotted-prefix cookies.
/// </summary>
/// <param name="cookieContainer">The <see cref="CookieContainer"/> to extract the <see cref="Cookie">Cookies</see> from.</param>
/// <param name="domain">The string that contains part of the domain you want to extract cookies for.</param>
/// <returns></returns>
public static IEnumerable<Cookie> GetCookies(this CookieContainer cookieContainer, string domain)
{
var domainTable = GetFieldValue<dynamic>(cookieContainer, "_domainTable");
foreach (var entry in domainTable)
{
string key = GetPropertyValue<string>(entry, "Key");
if (key.Contains(domain))
{
var value = GetPropertyValue<dynamic>(entry, "Value");
var internalList = GetFieldValue<SortedList<string, CookieCollection>>(value, "_list");
foreach (var li in internalList)
{
foreach (Cookie cookie in li.Value)
{
yield return cookie;
}
}
}
}
}
/// <summary>
/// Gets the value of a Field for a given object instance.
/// </summary>
/// <typeparam name="T">The <see cref="Type"/> you want the value to be converted to when returned.</typeparam>
/// <param name="instance">The Type instance to extract the Field's data from.</param>
/// <param name="fieldName">The name of the Field to extract the data from.</param>
/// <returns></returns>
internal static T GetFieldValue<T>(object instance, string fieldName)
{
BindingFlags bindFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;
FieldInfo fi = instance.GetType().GetField(fieldName, bindFlags);
return (T)fi.GetValue(instance);
}
/// <summary>
/// Gets the value of a Property for a given object instance.
/// </summary>
/// <typeparam name="T">The <see cref="Type"/> you want the value to be converted to when returned.</typeparam>
/// <param name="instance">The Type instance to extract the Property's data from.</param>
/// <param name="propertyName">The name of the Property to extract the data from.</param>
/// <returns></returns>
internal static T GetPropertyValue<T>(object instance, string propertyName)
{
var pi = instance.GetType().GetProperty(propertyName);
return (T)pi.GetValue(instance, null);
}
}
}
答案 5 :(得分：-1)
这是一个解决这个bug的黑客攻击： http://social.microsoft.com/Forums/en-US/netfxnetcom/thread/1297afc1-12d4-4d75-8d3f-7563222d234c 它使用反射。