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Strings are important in any programming language, and C# is no exception. In this chapter, we looked at the C# support for individual characters and for strings, which represent sequences of characters. We saw how to use literal values to define character and string values and how to perform operations on both types. We explored the range of class members and operators available to make working with strings easier and looked at the System.Text.StringBuilder class, which is a mutable companion to the read-only System.String class. We finished the chapter by looking at the composite formatting feature, which allows strings to be composed by embedding format items in strings, which become placeholders for string representations of other objects. We saw how to format the built-in numeric types and how to create custom format components.
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EXPRESSIONS AND OPERATORS
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correlated column values. Recent releases of Oracle will try to apply sanity checks to multicolumn joins. You can help by having a unique index on the join columns on one side of the join, in which case Oracle will use the number of distinct keys from this index for the join cardinality estimate. Oracle 10.1 also added further multicolumn join sanity checks that use the number of rows from the row sources involved as join cardinality if the estimated selectivity is below a certain limit. Oracle 11.1 adds further options to address the correlated column issue by the new multicolumn extended statistics. Check the statistics and the predicates applied: Expressions and functions in join predicates will use the default 1 percent or 5 percent selectivity, as already described. It might be possible to generate a function-based index if function expressions in the join predicates cannot be avoided, which will allow the optimizer to use the column statistics from the hidden column that is generated for the function-based index. When adding a function-based index, statistics must be regathered on the table to obtain statistics for the new hidden column by using FOR ALL HIDDEN COLUMNS (or FOR ALL COLUMNS to collect updated statistics on all of the table s columns) as the METHOD_OPT parameter in the DBMS_STATS call. Starting with release 11.1, it is possible to generate extended statistics on expressions, or use a virtual column instead. Check for histograms on the join columns: Histograms may influence the join selectivity/cardinality estimates significantly, and not always for the better. If a histogram does not exist for columns used in a join, a histogram (ideally frequency based) may be created on the join columns. If a histogram already exists, it might be beneficial to remove the histogram, keeping in mind that doing so may affect other queries. Automatic histogram generation is controlled by the METHOD_OPT parameter of DBMS_STATS. Note that starting with release 10.1, the default METHOD_OPT value is FOR ALL COLUMNS SIZE AUTO, which might generate histograms on columns that do not improve the join selectivity/cardinality estimates.
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Workflow has encountered an error. Should never be returned from a property. Internal use only. Workflow is valid but no new instances can be started. This state will never be returned by a property but is instead used to indicate no states for a filter. Workflow association has been created but the instance of the workflow has not begun processing. Should never be returned from a property. Internal use only. Workflow is currently executing normally. Workflow has been put on hold. Workflow was manually stopped by an administrator.
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Caution If you use a negative number in the relative position, the number is automatically changed to a
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You can see the public access modifier applied to properties in some of the example listings in earlier sections of this chapter. But you can also apply the access modifiers to the get and set accessors to get fine-grained control over your property. Listing 8-8 contains a demonstration. Listing 8-8. Applying an Access Modifier to an Accessor class Product { public int ItemsInStock { private get; set; } public double PricePerItem { get; set; } public double TotalValueOfStock { get { return ItemsInStock * PricePerItem; } } } In Listing 8-8, the ItemsInStock property is public. This is the access modifier that will apply to the accessors by default. But I have used the private modifier on the get accessor. This means that anyone can set the value of the property, but it can only be read within the class that contains the property, the Product class in this example. The access modifier you apply to the accessor must be more restrictive than the modifier applied to the property overall, so, for example, you can t use the public modifier on an accessor for a private property.
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Listing 11-29. A Generic, Highlightable List Box Item using using using using using System; Microsoft.SPOT; Microsoft.SPOT.Presentation.Controls; Microsoft.SPOT.Presentation.Media; Microsoft.SPOT.Presentation;
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CHAPTER 3 FILES
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As stated earlier, the CslaActionExtender component is an extender provider that adds functionality to any control that implements the IButtonControl interface. This means that you can use it with any Visual Studio button or link as well as with any third-party button control or link. The CslaActionExtender makes use of both the BindingSourceNode and the BindingSourceHelper classes and provides an almost no-code approach to functionality for which you would normally have to write quite a bit of code. This functionality includes saving a business object, invoking undo functionality of a business object, and closing a form. Moreover, the saving functionality comes in three flavors, which I ll get to in a minute. The CslaActionExtender component drags onto your form s component tray just like the ReadWriteAuthorization and BindingSourceRefresh components and just like a BindingSource component, for that matter. You can hit the ground running on this control in just one step. Simply call the ResetActionBehaviors method of the component and pass your root business object into its one and only argument. This initializes the component and everything within it, just like the ResetControlAuthorization() method in the ReadWriteAuthorization component. You ll then need some buttons on your form to represent certain actions. The mere presence of the CslaActionExtender component adds several properties to your buttons, all nicely organized in the Csla property browser category. The CslaActionExtender component can extend button or buttonlike controls to provide save, cancel, or close functionality automatically. The CslaActionExtender component also includes properties and events of its own, the most important being the DataSource property, which you would point to a root BindingSource on the form. Table 10-4 lists other properties.
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In ASP.NET 4.0, however, all these controls support a new RenderOuterTable property that if set to false will use a div instead.
A root object may be a stand-alone object. It may also be a parent if it contains child objects. A child object could also be a parent if it, in turn, contains other child objects. An example of a root and parent object is an Invoice, while an example of a child object would be a LineItem object within that Invoice. Child objects are related to root objects via a containment relationship, as illustrated by the class diagram in Figure 3-3.
When a CSLA .NET collection is serialized, the indices within the collection do not pass the serialization boundary. This would be possible in theory, but the performance implications of having not only the objects themselves but all the indices on those objects get passed over the wire are not insignificant. In addition, the indexing mechanism depends on hash-code generation of objects that is only consistent at the scope of a physical machine that is, hash codes are not guaranteed to be equivalent on, say, a 64-bit operating system and a 32-bit operating system so it would be impractical to translate the index values during serialization in the absence of a generic hash code generator that could guarantee durability across machine boundaries. While the index itself is not passed over the serialization boundary, the index is re-created according to the options specified on the child class. This typically happens upon the first instance of a query that utilizes the index on the other side of the serialization boundary.
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