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Working with Data Readers
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Figure 8-4. FilteredTextBox extender displaying the date fetched from a web service
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CHAPTER 27 LINQ TO OBJECTS
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In the style, the setter is used to set a property to a specific value. Property element syntax is also supported when setting the value of a property. One example of using property element syntax is to set a control template, which can completely change the look and feel of a control. We ll examine control templates in more detail in the Using Control Templates section of this chapter. Setting a control template in a style looks like this: <Style ...> <Setter Property="Template"> <Setter.Value> <ControlTemplate ...> </Setter.Value> </Setter> </Style> What if a property is defined in a style and also defined locally As detailed in 2 (Figure 2-5, which is shown again as Figure 8-7), you ll see that the style setter actually has rather low precedence. The property values from style setters can be overridden by values from many sources, and, as you can see, the local value has a relatively high precedence. If you use a style setter and it doesn t appear to work, look at these other sources for property values, since something is most likely overriding the property value.
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public static object CallMethod( object obj, MethodInfo info, params object[] parameters) { // call a private method on the object object result; try { result = info.Invoke(obj, parameters); } catch (Exception e) { throw new Csla.Server.CallMethodException( info.Name + " " + Resources.MethodCallFailed, e.InnerException); } return result; } The first version accepts the method name as a string value, while the second accepts a MethodInfo object. In the first case, GetMethod() is called to retrieve a matching MethodInfo object. If one isn t found, an exception is thrown; otherwise, the second version of CallMethod() is invoked. The second version of CallMethod() actually invokes the method by using the MethodInfo object. The interesting bit here is the way exceptions are handled. Since reflection is being used to invoke the business method, any exceptions that occur in the business code end up being wrapped within a reflection exception. To business developers, the exception from reflection isn t very useful. They want the actual exception that occurred within their business method. To resolve this, when an exception is thrown as the business method is invoked, it is caught, and the InnerException of the reflection exception is wrapped within a new Csla.Server.CallMethodException. Effectively, the reflection exception is stripped off and discarded, leaving only the original exception thrown within the business code. That exception is then wrapped within a CSLA .NET exception so the name of the failed business method can be returned as well.
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handle. Create a new VB Class Library project called EPRService, placing this within the VBEmployeePerformanceReview folder. When the project is added, change the name of Class1.vb to IEPRService.vb within the Solution Explorer. Next, add a reference to System. Workflow.Activities by right-clicking the EPRService project in the Solution Explorer and choosing Add Reference. When the Add Reference form appears under the .NET tab (the default tab), find and select System.Workflow.Activities and click OK. Open the IEPRService.vb file and change the code to the following: Imports System Imports System.Workflow.Activities <ExternalDataExchange()> _ Public Interface IEPRService End Interface The first two lines import the necessary namespaces. Remember the <ExternalDataExchange()> _ line defines this as an interface that exchanges data with other applications. Add a new class to the EPRService project called EPREventArgs. Open the new class and replace the default code with the following: Imports System Imports System.Workflow.Activities <Serializable()> _ Public Class EPREventArgs Inherits ExternalDataEventArgs Private IntReviewID As Integer Public Property ReviewID() As Integer Get Return IntReviewID End Get Set(ByVal value As Integer) IntReviewID = value End Set End Property Public Sub New(ByVal InstanceID As Guid, ByVal ReviewID As Integer) MyBase.New(InstanceID) IntReviewID = ReviewID End Sub End Class Again, the first two lines just import the necessary namespaces. The <Serializable()> _ attribute tells the .NET Framework to serialize this class. This class also inherits from ExternalDataEventArgs and must have a New sub within it. That New sub must call the New sub of the base class (ExternalDataEventArgs). The New sub for this class accepts two parameters. The first is the instance ID of the workflow that is to be used, and the second is the ReviewID of the review this instance of the workflow is to work with. Now you need to define the events for the interface file. There will be four events representing the four different state shifts that can occur. The first is EmployeeToSupervisor, which is called anytime the review is sent from the employee to the supervisor. The second is SupervisorToEmployee, which is called anytime the review is sent from the supervisor to the
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The output of Listing 5-10 is as follows: abc Fourscore and 7 years ago. 7 1.05 65
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Inheritance Demand: For classes, this action specifies the permission that all classes descending from this one must have. For methods, this action specifies the permission that all methods overriding this one must have. Obviously, this action makes sense for virtual methods only. After the classes and their members have been loaded, the IL code of the invoked methods is JIT compiled. The declarative action targeting classes and methods takes effect at this stage: Link Demand: This action specifies the permission that all callers of this method must have or, if the target is a class, the permission that any method of this class must have. For example, if you have a method that formats the system drive, you want to ensure that this method cannot be successfully called from some rogue code that has no right to do so. This action is limited to the immediate caller only. If method A link-demands permission P and method B calling A has this permission but method C calling B does not, the call will go through. The last stage of the application execution is the run time, when the JIT-compiled code is actually executed. The declarative actions taking effect at this last stage and targeting classes and methods are as follows: Demand: This action is similar to Link Demand, but it demands that all callers in the call chain have the specified permission. Assert: This action specifies the permission that the current method must have. Even if the callers of this method higher on the call stack don t have the specified permission, the security check succeeds. This action obviously weakens the declarative security model and should be applied with caution. You cannot apply this action unless the code has the access permission SecurityPermission, which is discussed in the next section. Deny: This action specifies the permission that must be disabled for all callees down the call stack for the duration of the called method. If a callee never had the specified permission in the first place, the action has no effect on it. Permit Only: This action specifies the permission that must not be disabled for all callees down the call stack, presuming that the rest of the permissions must be disabled. The action seems excessively cruel (to strip the poor callees of all their privileges except one), but you must not forget that the target might have multiple security attributes. Using a series of Permit Only actions, you can create a set of permissions that remain for the callees to enjoy while all other permissions are temporarily revoked. To clarify this, consider the following example. If the called method has security attributes Deny P and Deny Q, all methods it calls (and the methods those methods call, and so on) will have their permissions P and Q suspended. If the called method has security attributes Permit Only P and Permit Only Q, all permissions except P and Q of all callees will be suspended. And now, let s see what these Ps and Qs stand for.
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Previously ASP.NET limited accepted URLs to a maximum of 260 characters (an NTFS constraint). ASP.NET 4.0 allows you to extend (or limit) the URL and query string maximum length. To modify these settings change the maxRequestPathLength and maxQueryStringLength properties (in the httpRuntime section) in Web.config: <httpRuntime maxQueryStringLength="260" maxRequestLength="2048"/>
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The Parallel Stacks window enables you to visualize multiple call stacks within one window. It operates in two modes, Task or Thread, which can be changed in the drop-down menu in the left corner. We will take a look at the Thread mode (the Task mode is very similar, but shows only tasks), so make sure that Threads is selected in the drop-down menu.
CHAPTER 8 EXPRESSIONS AND OPERATORS
CHAPTER 2 SE TTIN G UP DIFFER ENT CA MERA MODE S IN YOUR 3 D WORLD
The indexer returns a text value describing any validation error for a specific property. In this implementation, only the first validation error in the list is returned. In either case, if there are no errors, an empty string value is returned telling data binding that there are no broken rules to report. It is important to realize that the rules are not checked when this interface is invoked. The rules are checked when a property changes or when the business developer explicitly runs the rules. When IDataErrorInfo is invoked, the rules have already been checked, so this implementation simply returns the precalculated results. This is important because the IDataErrorInfo interface is invoked frequently. Each time data binding refreshes the UI or receives a PropertyChanged event from the object, it loops through all the bound properties to see if they re valid. You can expect IDataErrorInfo to be invoked dozens or hundreds of times during the lifetime of a single user interaction. At this point, you should understand the four interfaces implemented by editable objects to support data binding. Some of these interfaces INotifyPropertyChanged and IEditableObject, in particular interact with any parent collection that might contain the object. I ll discuss data binding and collections next.
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