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When a property of an object is changed, a PropertyChanged event is raised. I discuss the PropertyChanged event and how it supports data binding in 10. For now it is enough to know that changing a property value in an object results in this event being raised. If the child object is a collection or list that inherits from BusinessListBase, a ListChanged event is raised when the list changes. This includes changes to properties of child objects contained in the list. In other words, when an object in the list changes, it raises a PropertyChanged event, which is handled by the list and results in a ListChanged event being raised. Again, I discuss ListChanged and data binding more in 10. There are cases where the parent of an object needs to know that its child has been changed. For example, sometimes you ll have business or validation rules that must run in the parent when a child is changed. To address this, BusinessBase includes code to handle the PropertyChanged or ListChanged events raised by any child objects. When such an event is handled, the result is a call to OnChildChanged(), which raises a ChildChanged event from the parent. This means that the author of a parent business object can either override OnChildChanged() or handle the parent object s ChildChanged event. Either technique will result in notification that a child has changed. The key is that BusinessBase includes code in the LoadPropertyValue() method (discussed in 7) to hook the PropertyChanged or ListChanged event of any child object when a reference to the child object is loaded into a managed backing field. Also, when an object is serialized and deserialized (which occurs when it is cloned or flows through the data portal), all event hookups are lost. They must be reestablished when the object is deserialized, and that occurs in BusinessBase in the FieldDataDeserialized() method, which is called from the OnDeserializedHandler() method. In both cases, the events are handled by these two methods in BusinessBase: Private Sub Child_PropertyChanged(ByVal sender As Object, _ ByVal e As PropertyChangedEventArgs) OnChildChanged(sender, e, Nothing) End Sub Private Sub Child_ListChanged(ByVal sender As Object, _ ByVal e As ListChangedEventArgs) OnChildChanged(sender, Nothing, e) End Sub As you can see, they both call the OnChildChanged() method, which is Protected and Overridable: <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Overridable Sub OnChildChanged(ByVal source As Object, _ ByVal propertyArgs As PropertyChangedEventArgs, _ ByVal listArgs As ListChangedEventArgs) Dim args As New Csla.Core.ChildChangedEventArgs(source, propertyArgs, listArgs) RaiseEvent ChildChanged(Me, args) End Sub
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The StateFinalization activity does just what you would expect: it gives you the opportunity to execute some activities just before the workflow transitions out of a state. It is the antithesis of the StateInitialization activity we just looked at. Other than its place in the processing order, it is exactly the same as the StateInitialization activity.
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Each block in a segment has a block header. Part of this block header is a transaction table. Entries will be made in the transaction table to describe which transactions have what rows/elements on the block locked. The initial size of this transaction table is specified by the INITRANS setting for the object. For tables, this defaults to 2 (indexes default to 2 as well). This transaction table will grow dynamically as needed up to MAXTRANS entries in size (given sufficient free space on the block, that is). Each allocated transaction entry consumes 23 to 24 bytes of storage in the block header. Note that as of Oracle 10g, MAXTRANS is ignored all segments have a MAXTRANS of 255.
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toward the start of the output. (This output helps determine the portion of the SHORT_STACK output that may be ignored during later ORADEBUG SHORT_STACK dumps.) <-ksedsts()+334<-ksdxfstk()+42<-ksdxcb()+1861<-ssthreadsrgruncallback()+559<-Or cleOradebugThreadStart()+965<-0000000076CCBE3D<-0000000076ED6A51<-0000000076EF6 5A<-000007FEFC7DF231<-000007FEFC7E16A8<-000007FEFDFA21A9<-00000000003D407C<-000 0000003CEF92<-0000000008CB35E3<-0000000008CB69C1<-0000000008BB7B3E<-__PGOSF159_ pikndf2()+1068<-opitsk()+1207<-opiino()+1140<-opiodr()+1324<-opidrv()+810<-sou2 ()+52<-opimai_real()+151<-opimai()+96<-OracleThreadStart()+704<-0000000076CCBE3 <-0000000076ED6A51 The following is an example of a SHORT_STACK dump, which shows a session executing a query that resulted in a disk read. The data block was brought into the buffer cache so a row in that block that was needed deep in the query s execution plan (inside an in-line view containing a GROUP BY clause) could be examined as a result of an index lookup: <-ksedsts()+334<-ksdxfstk()+42<-ksdxcb()+1861<-ssthreadsrgruncallback()+559<-Ora cleOradebugThreadStart()+965<-0000000076CCBE3D<-0000000076ED6A51<-0000000076EF70 5A<-0000000076CDC1B8<-skgfrwat()+150<-ksfdwtio()+321<-ksfdbio()+2193<-kcfprd()+1 222<-kcbzib()+18747<-kcb_prefetch()+298<-ktrprefetch()+85<-kdstlps()+678<-qerpfP refetch()+342<-qerpfRealFetch()+614<-qerpfFetch()+82<-qertbFetchByRowID()+629<-q ersoProcessULS()+208<-qersoFetch()+4477<-qerjotFetch()+393<-qerjoFetch()+815<-qe rjotFetch()+621<-qerjotFetch()+621<-qerjoFetch()+815<-qerflFetch()+177<-qerjoFet ch()+815<-qerjoFetch()+815<-qerflFetch()+177<-qerjoFetch()+815<-qerjoFetch()+815 <-qerflFetch()+177<-qerjoFetch()+815<-qerjoFetch()+815<-qerflFetch()+177<-qerjoF etch()+815<-qerjoFetch()+815<-qerflFetch()+177<-qerjoFetch()+815<-qerghFetch()+4 887<-qervwFetch()+174<-opifch2()+3630<-kpoal8()+3236<-opiodr()+1324<-ttcpip()+46 31<-opitsk()+2103<-opiino()+1140<-opiodr()+1324<-opidrv()+810<-sou2o()+52<-opima i_real()+151<-opimai()+96<-OracleThreadStart()+704<-0000000076CCBE3D<-0000000076 ED6A51 Reading the stack dump from the bottom up (with a couple of items skipped), you have the following: OracleThreadStart (the creation of the session s process/thread) opi (Oracle server functions top of the server stack) ttc (two-task common layer) opiodr (communication) kpoal8 (support for programmatic operations) opifch (Oracle server functions top of the server stack) qervw (view row source) qergh (group by no-sort, hash) qerjo (row source join) qerfl (filter row source) qerjo (row source join) qerfl (filter row source) qerjo (row source join) qerfl (filter row source) qerjo (row source join) qerfl (filter row source) qerjo (row source join) qerso (sort row source) qertb (table row source) qerpf (query execution row source prefetch) kds (retrieving or updating a row) ktc (kernel transaction read consistency) kcb (manages buffer cache operations) kcf (manages operations on the control files) ksf (various kernel operations, such disk I/O). Tanel Poder s blog ( offers scripts named OS_EXPLAIN and OStackProf that simplify the decoding of stack traces.
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protected StringBuilder _ExecuteQuery(string commandText) { int rowAffected = 0; DataTable datatable = new DataTable(); StringBuilder sb = new StringBuilder(); SQLDataAccessComponent dac = null; SqlCommand Command = null; try { dac = new SQLDataAccessComponent(this.ConnectionString); Command = new SqlCommand(commandText, new SqlConnection()); dac.BeginTrans(); rowAffected = dac.ExecuteDataTable(Command, ref datatable); dac.CommitTrans(); if (datatable.Rows.Count > 0) { foreach (DataRow dataRow in datatable.Rows) { StringBuilder rowBuilder = new StringBuilder(); foreach (object obj in dataRow.ItemArray) { if (!(obj is DBNull || (obj is System.Byte[]))) { rowBuilder.Append(string.Format("{0} ", obj.ToString())); } } sb.Append(string.Format("{0}{1}", rowBuilder.ToString(), Environment.NewLine)); } } sb.Append( string.Format("------ SQL execute success, row affected : {0} ------{1}", rowAffected, Environment.NewLine)); sb.Append(Environment.NewLine); } catch (Exception ex) { throw new ApplicationException( string.Format("------ SQL execute failed, error message: {0}", ex.Message, Environment.NewLine)); } finally { if (null != Command) { Command.Dispose(); } if (null != dac) {
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5. Now we can erase the default throw new code and raise and handle the Click event for all
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The CSLA .NET framework supports localization. For a framework, the key to supporting localization is to avoid using any string literal values that might be displayed to the end user. The .NET Framework and Visual Studio 2005 offer features to assist in this area through the use of resources. In the Solution Explorer window, double-click on the Properties node under the Csla project to bring up the project s properties windows. Click on the Resources tab to navigate to the built-in resource editor. Figure 3-2 shows this editor with several of the string resources from Resources.resx. The complete set of resources is available in the Resources.resx file in the download. Additionally, a number of people around the world have been kind enough to translate the resources to various languages. As this is an ongoing process, please refer to for updates to the framework and resource files.
The App.config file is an XML file that contains settings to configure the application. You use different XML depending on how you want the application configured.
I won t fully discuss object persistence, factory methods, and the data portal until 15, so you may want to skip ahead and review those concepts and then return to the following discussion.
The terms service orientation (SO) and Service Oriented Architecture (SOA) are clearly the new buzzwords leading us into the next generation of distributed applications and shaping the stack of technologies that enable developers to implement them.
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