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Figure 25-5. The anatomy of a parallel foreach loop You won t usually need to provide the generic type when creating a parallel loop because the C# will infer the required type from your data source. A parallel foreach loop takes the data source you have provided and breaks it into chunks, also known as partitions or regions. These chunks are then passed to a group of Tasks which apply the lambda expression or Action to each item in their chunk. This process, known as chunked execution, is illustrated by Figure 25-6.
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In an interactive application one where you query some data out of the database, allow an end user to manipulate it, and then put it back into the database a blocked UPDATE or DELETE indicates that you probably have a lost update problem in your code. (I ll call it a bug in your code if you do.) You are attempting to UPDATE a row that someone else is already updating (in other words, one that someone else already has locked). You can avoid the blocking issue by using the SELECT FOR UPDATE NOWAIT query to Verify the data has not changed since you queried it out (preventing lost updates). Lock the row (preventing the UPDATE or DELETE from blocking).
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Windows Forms was the original Windows client user interface toolkit that shipped with .NET version 1.0. There have been many enhancements and additions since then, but the basic design approach has remained the same. You can use Windows Forms to quickly create programs that match the look and feel of Windows, and there is an extensive market in third-party add-ons that enrich the overall feature set. Windows Forms has lost some programmer mind share since the Windows Presentation Foundation (WPF), which is covered in 33, was released. WPF doesn t replace Windows Forms, but many programmers have moved to it because it is a new technology and because it has richer support for multimedia. This is a shame, because Windows Forms are ideally suited to building line-ofbusiness applications, which is what most programmers spend their days doing. WPF has some super features, but that doesn t mean you shouldn t give Windows Forms serious consideration when planning a project. In this chapter, we ll start by creating a stand-alone program that solves a simple real-life problem I faced recently. This will introduce you to some of the user interface controls that are available and the property/event model that is used to configure and consume the control features. We will then move on to integrating data from a database into a Windows Form application. This is a process that is painless and simple and demonstrates one of the features that makes Windows Forms so eminently suitable for business applications. We will finish by looking at the add-on support Microsoft provides for accessing features that are specific to Windows 7 and Vista, and I ll demonstrate one of those features the much loved Aero Glass.
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Most developers are understandably ambivalent about a major upcoming release such as WCF. On the one hand, we welcome advancements in technology and the improvements in functionality and productivity that it will hopefully bring. On the other hand, we dread having to learn a new way of doing things, and we wonder whether we will be able to migrate our existing code to the new infrastructure. These are valid concerns, especially with WCF. But the issue is less about WCF changing things than it is about things needing to change. Developers today are faced with multiple and often competing technologies for building distributed applications, including the classic choice between XML Web services vs. .NET Remoting. Certainly, there are cases where there is no overlap and no ambivalence and where one technology is clearly the better choice than another. But these technologies share too much in common to be treated differently. They are simply variations of the same technology. In the case of XML Web services and .NET Remoting, they are both concerned with remote distributed object and service invocation over a defined transport channel. Microsoft is starting to address developer concerns by providing guidelines for how to get ready for WCF. It is already making sure to bring this topic up at professional conferences, and it will certainly continue to do so until the release of WCF. There has simply been too much investment in existing technologies for it not to. WCF is obviously not a replacement for the entire set of .NET Framework functionality. Instead, it is focused on supporting distributed service-oriented applications with security, transaction support, and reliable messaging. WCF primarily extends four core technologies that are available today:
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3. In the Appearance bucket of the Properties panel, set the Opacity of the Rectangle to 0. 4. Now, give the new Rectangle a Name of ImageSelector. 5. Select the ListBox and give it a Name of ZStackLB. 6. Press Ctrl+Shift+B to compile the application and switch back to Visual Studio.
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Using a property is just like using a field. To get the value, you use the property name, and to assign a new value, you use the property name and the assignment operator (=). The following code demonstrates using the property and public field defined in Listing 8-2: class Listing 02 Test { static void Main(string[] args) { // create a new instance of the Product class Product prod = new Product(); // set the value of the fields prod.ItemsInStock = -20; prod.PricePerItem = 5.23; // get the total value of the products in stock Console.WriteLine("Total stock value: {0}", prod.GetTotalValueOfStock()); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }
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default, so no need to declare it as such). You can see my code here: namespace InterfaceProject { interface IModeOfTransporation { } }
USERNAME SID RBS SLOT SEQ LMODE REQUEST --------- ---------- ---------- ---------- ---------- ---------- ---------OPS$TKYTE 703 2 26 8297 6 0 ops$tkyte%ORA11GR2> select XIDUSN, XIDSLOT, XIDSQN 2 from v$transaction; XIDUSN XIDSLOT XIDSQN ---------- ---------- ---------2 26 8297 The interesting points to note here are as follows: The LMODE is 6 in the V$LOCK table and the request is 0. If you refer to the definition of the V$LOCK table in the Oracle Server Reference manual, you will find that LMODE=6 is an exclusive lock. A value of 0 in the request means you are not making a request; you have the lock. There is only one row in this table. This V$LOCK table is more of a queuing table than a lock table. Many people expect four rows in V$LOCK since we have four rows locked. Remember, however, that Oracle does not store a master list of every row locked anywhere. To find out if a row is locked, we must go to that row. I took the ID1 and ID2 columns and performed some manipulation on them. Oracle needed to save three 16-bit numbers, but only had two columns in order to do it. So, the first column ID1 holds two of these numbers. By dividing by 2^16 with trunc(id1/power(2,16)) rbs, and by masking out the high bits with bitand(id1,to_number("ffff","xxxx"))+0 slot, I am able to get back the two numbers that are hiding in that one number. The RBS, SLOT, and SEQ values match the V$TRANSACTION information. This is my transaction ID.
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