我一直在为我的公司评估消息传递技术,但我对几个术语之间的概念差异感到非常困惑:
发布/订阅与多播与扇出 我正在使用以下定义:
这些定义是对的吗？或者Pub/Sub模式和组播,直接,扇出等方式来实现模式？
我正在尝试将开箱即用的RabbitMQ定义应用到我们的架构中,但我现在只是试图为我们的应用程序编写规范.
请有人可以告诉我,我是否正确？
当我尝试使用方法GroupPrincipal.FindByIdentity查询Active Directory时,我收到间歇性COM异常" 发生操作错误(0x80072020) "(如下所示)
这是我的代码:
PrincipalContext ctx = new PrincipalContext(ContextType.Domain, Environment.UserDomainName);
GroupPrincipal groupPrincipal = GroupPrincipal.FindByIdentity(ctx, IdentityType.Name, "Group to find");
我收到例外:
Inner Exception: System.Runtime.InteropServices.COMException (0x80072020): An operations error occurred.
at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
at System.DirectoryServices.DirectoryEntry.Bind()
at System.DirectoryServices.DirectoryEntry.get_AdsObject()
at System.DirectoryServices.PropertyValueCollection.PopulateList()
at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName)
at System.DirectoryServices.PropertyCollection.get_Item(String propertyName)
at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInitNoContainer()
at System.DirectoryServices.AccountManagement.PrincipalContext.DoDomainInit()
at System.DirectoryServices.AccountManagement.PrincipalContext.Initialize()
at System.DirectoryServices.AccountManagement.PrincipalContext.get_QueryCtx()
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithTypeHelper(PrincipalContext context, Type principalType, Nullable`1 identityType, String identityValue, DateTime refDate)
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithType(PrincipalContext context, Type principalType, IdentityType identityType, String identityValue)
at System.DirectoryServices.AccountManagement.GroupPrincipal.FindByIdentity(PrincipalContext context, IdentityType identityType, …我在一个类似的对象构造函数中有一些代码
delegate DataSet MyInvoker;
public MyObject(Param1 p1)
{
// property sets here
// ...
BeginMyAsyncMethod();
}
public void BeginMyAsyncMethod()
{
// set some properties
// ...
MyInvoker inv = new MyInvoker(SomeBeginMethod);
inv.BeginInvoke(new AsyncCallback(SomeEndMethod), null);
}
我的问题是:
这个答案给我的印象是,将它留给用户是不好的做法,虽然我特别谈到在构造函数中启动异步方法,而不是正确构造对象.
我有一个类似的方法:
public static void DoSomething (string param1, string param2, SomeObject o)
{
//.....
lock(o)
{
o.Things.Add(param1);
o.Update();
// etc....
}
}
几点:
private static object吗？ 如何使用C#滚动到WinForms TextBox中的指定行？
谢谢
我有这个查询,只需要3.5秒来获取2条记录.然而,推荐书中有超过10万行,用户为13k,课程为850,考试为2.
SELECT t.*, u.name, f.feedback
FROM testmonials t
INNER JOIN user u ON u.id = t.userid
INNER JOIN courses co ON co.id = t.courseid
LEFT JOIN exam ex ON ex.id = t.exam_id
WHERE t.status = 4
AND t.verfication_required = 'Y'
AND t.verfication_completed = 'N'
ORDER BY t.submissiondate DESC
.解释结果:.
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE co ALL PRIMARY NULL NULL NULL 850 Using temporary; Using filesort
1 SIMPLE t ref CID,nuk_tran_user CID 4 kms.co.id …我正在尝试在网格视图中排序功能,但它不工作.可以帮助一些身体吗？
码:
private string ConvertSortDirectionToSql(SortDirection sortDirection)
{
string newSortDirection = String.Empty;
switch (sortDirection)
{
case SortDirection.Ascending:
newSortDirection = "ASC";
break;
case SortDirection.Descending:
newSortDirection = "DESC";
break;
}
return newSortDirection;
}
protected DataSet FillDataSet()
{
string source = "Database=GridTest;Server=Localhost;Trusted_Connection=yes";
con = new SqlConnection(source);
cmd = new SqlCommand("proc_mygrid", con);
ds = new DataSet();
da = new SqlDataAdapter(cmd);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
return ds;
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dt = GridView1.DataSource as DataTable;
if (dt != null) …和
我的结论是:
MaxConcurrentSessions是每个客户端的排队会话数(默认值为10) MaxConcurrentCalls是服务上的活动连接数(默认值为16),即任何一次访问该服务的所有客户端,这意味着如果2个客户端每次执行10次调用, 4必须在队列中等待处理.
问题:
(注意:我使用的是.NET 3.5)
在速度和生成的通知量方面,这段代码是:
ObservableCollection<Foo> foo = new ObservableCollection<Foo>(bar);
this.SomeProperty = foo;
同样如下:
this.SomeProperty = new ObservableCollection<Foo>();
foreach (var v in bar)
{
this.SomeProperty.Add(v);
}
如果它们相同,是否有可能以某种方式关闭生成的通知？
目标: 我正试图加速在Silverlight中显示Telerik RadChart.即使在设置了包含ObservableCollection的属性之后,似乎还需要一段时间才能显示(并在浏览器应用程序中冻结).绘制图表后,一切正常.
在AD工作中,我们有一些启用了邮件的安全组.我正在使用System.DirectoryServices.AccountManagement命名空间,如下所示:
List<GroupPrincipal> result = new List<GroupPrincipal>();
using (PrincipalContext domain = new PrincipalContext(ContextType.Domain, userinfo[0]))
using (UserPrincipal user = UserPrincipal.FindByIdentity(domain, username))
{
if (user != null)
{
PrincipalSearchResult<Principal> groups = user.GetAuthorizationGroups();
int totalGroupCounter = 0;
StringBuilder output = new StringBuilder();
List<GroupPrincipal> securityGroups = new List<GroupPrincipal>();
List<GroupPrincipal> distributionGroups = new List<GroupPrincipal>();
foreach (Principal group in groups)
{
totalGroupCounter++;
if (((GroupPrincipal)group).IsSecurityGroup.Value)
securityGroups.Add((GroupPrincipal)group);
else
distributionGroups.Add((GroupPrincipal)group);
}
}
}
有了这些信息,找到该组的电子邮件地址的正确方法是什么？