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Writing All That Code
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The Long Version for Everyone Else
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CHAPTER 4 CLASSES: THE BASICS
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Using the ScriptManager Designer Interface
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CH A PT ER 7 PRO PERTY DE CLA RAT IO NS
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A great feature in VS2008 is that you can enter a new method name that doesn t exist and have the IDE create a stub of it for you (to do this enter a method name that doesn t exist, press Ctrl + . and select the Generate method stub option). VS2010 expands on this functionality and allows you to create classes, structs, interfaces, and enums in a similar manner. This is a great feature when you are starting the development of an application and particularly suitable for a TDD style of development. Let s try this out now. 1. 2. Create a new console application Enter the following code: Zebra MyZebra = new Zebra();
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Figure 8-5. Examples of bitwise logical operators The following code implements the preceding examples: const byte x = 12, y = 10; sbyte a; a a a a = = = = x & y; x | y; x ^ y; ~x; // // // // a a a a = = = = 8 14 6 -13
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Database Version
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CHAPTER 9 REDO AND UNDO
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HLSL
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Figure 9-21. The ErrorProvider control displaying validation error information
The ANSI/ISO SQL standard defines four levels of transaction isolation, with different possible outcomes for the same transaction scenario. That is, the same work performed in the same fashion with the same inputs may result in different answers, depending on your isolation level. These isolation levels are defined in terms of three phenomena that are either permitted or not at a given isolation level:
So, each of the following is an example of a valid condition: this.Enabled != True myObject.myStaticMethod(this.workflowProperties.AssociationData ["Some_Property"]) != String.Empty this.workflowProperties.Item.Attachments.Count >= 0 && this. workflowProperties.Item.Attachments.Count < 5 this.some_variable + this.another_variable >= 3 Pretty straightforward stuff. The last thing we need to cover with regard to Declarative Rule Conditions is how they are stored and applied. We ve already said that these conditions are not compiled, so what happens with them Where do they go What are they all about, Alfie If you take a look in the Solution Explorer inside Visual Studio after creating a condition, you will see a new file has been added to your project. It will be the name of your workflow class file with a .rules extension for example, MyRulesWorkflow1.rules. If you open the file in Visual Studio, you will see a whole lot of very verbose XML. I say it s verbose because, for example, for the simple condition this.workflowProperties.Item.Attachments.Count > 0, the resulting XML is 36 lines long. Ouch. I m not going to show you an example here because we re not going to do anything with it and it would just fill the page with a lot of unattractive XML. The XML itself is pretty straightforward. If you take a few minutes to analyze it, you ll come to grips with the logic behind it all. It makes heavy use of CodeDom, so a familiarity with that would be helpful. Oh, OK, stop whining, I ll show you an example of a .rules file. But don t blame me if you get a hernia carrying this book around. Figure 8-6 shows the .rules file for a Declarative Rule Condition of this.workflowProperties.Item.Attachments.Count > 0. As you can see in Figure 8-6, it is quite lengthy. In my ongoing effort to be a good, helpful author, I added some indicators for the important parts: A: The name of our condition in case we need to use it over again or refer to it in documentation B: The operator that sits between the left and right portions of our condition C-F: The left side of our condition, shown from the inside out G: The right side of our expression in this case, simply the value we re comparing against That s it, a simple .rules file. As I said, verbose, but not difficult to understand. If you happen to be a code-masochist, you could write a utility to generate the properly formed XML. As I mentioned before, we are somewhat limited with what we could do with the conditions. In a pure WF project, you can dynamically load and modify these .rules files at runtime based on your needs. In that case, the schema and details of the .rules file would be far more important. For our Office workflows, however, we need to take a slightly different approach, which we re sneaking up on. I can sense the anticipation building
The CSLA .NET framework provides for deferred or immediate deletion of an object. The immediate approach directly deletes an object s data from the database without first loading the object into memory. It requires prior knowledge of the object s primary key value(s), and is discussed in 4, as it is directly linked to data access. The deferred approach requires that the object be loaded into memory. The user can then view and manipulate the object s data, and may decide to delete the object, in which case the object is marked for deletion. The object is not immediately deleted, but rather it is deleted if and when the object is saved to the database. At that time, instead of inserting or updating the object s data, it is deleted from the database. This approach is particularly useful for child objects in a collection. In such a case, the user may be adding and updating some child objects at the same time as deleting others. All the insert, update, and delete operations occur in a batch when the collection is saved to the database. Whether an object is marked for deletion or not is tracked by the _isDeleted field and exposed through an IsDeleted property. As with IsDirty, there s a protected method to allow the object to be marked for deletion when necessary: protected void MarkDeleted() { _isDeleted = true; MarkDirty(); } Of course, marking the object as deleted is another way of changing its data, so the MarkDirty() method is called to indicate that the object s state has been changed. The MarkDeleted() method is called from the Delete() and DeleteChild() methods. The Delete() method is used to mark a non-child object for deferred deletion, while DeleteChild() is called by a parent object (like a collection) to mark the child object for deferred deletion: public void Delete() { if (this.IsChild) throw new NotSupportedException(Resources.ChildDeleteException); MarkDeleted(); } internal void DeleteChild() { if (!this.IsChild) throw new NotSupportedException(Resources.NoDeleteRootException); MarkDeleted(); }
In all the managed arrays discussed so far, each element of the array is an instance of a value type. There is no option to create managed arrays of managed objects; the type name array<System::String> is illegal. However, you can create managed arrays of tracking handles for example, array<System::String^>. To create a managed array of tracking handles the same syntax as for creating value arrays is used: array<String^>^ arr1 = { "1", "2", "3" }; array<String^>^ arr2 = gcnew array<String^>(3); There are special rules for managed arrays of tracking handles. Similar to value arrays, a tracking handle array is initialized by setting all tracking handle elements to nullptr. The objects that the array elements refer to are created and destroyed independent of the array. Creating an array of ten string handles does not create ten strings. An array of ten System::String handles has the same size as an array of ten System::Object handles. Due to the similar object layout that arrays of different tracking handles have, there is a special conversion option. Since there is an implicit conversion from String^ to Object^, all elements of an array<String^> can be treated as Object^. Therefore, there is also an implicit conversion from an array of string handles to an array of object handles. Since there is an implicit conversion from any tracking handle to System::Object^, there is also an implicit conversion from an array<T^>^ to array<Object^>^, where T may be any
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