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In this section, you will learn how to create menus using the ListBox class of the .NET Micro Framework. A list box holds a collection of selectable items and stacks them vertically. Exactly one item can be selected at a time, and the list box control handles scrolling the items vertically if necessary.
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s If the default implementation for authorization as implemented in 3 doesn t meet your needs, the Tip business object can override the CanReadProperty() and CanWriteProperty() methods from BusinessBase and you can implement your own algorithm.
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Bind variable peeking: Sometimes sharing an execution plan because of bind variable usage might lead to inefficient future executions of the SQL statement. This may happen when the bind variable values used to parse the SQL statement lead to significantly different selectivity/cardinality estimates than those values submitted during later executions. This applies in particular to columns with skewed data distributions, and in cases where the passed-in bind variable values are significantly outside the recorded low and high values for the columns (the optimizer scales the selectivity accordingly if the predicate values are outside the range of known column values). It might help to remove histograms on the affected columns as a damage-limitation measure when there is skewed column data distribution (keep in mind, however, that doing so might affect other queries negatively). Applying application logic to prevent plans from being shared inappropriately is another approach when it is possible to determine that a plan should not be shared. This might be accomplished by artificially introducing two copies of a SQL statement that differ only by an embedded comment. Oracle 11.1 introduced the adaptive cursor-sharing feature, which attempts to detect inefficient sharing of execution plans and automatically generates additional child cursors for the same SQL statement, potentially with different execution plans.
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Running this program displays the mime types and their commands in the default location.
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Although the MSMQ technology is well-suited to the service-oriented mindset, its programming model is different enough to warrant a non-trivial migration rating. Keep in mind that it s extremely easy to interoperate between WCF and MSMQ. Given this, plus given MSMQ s already rich messaging infrastructure, migrating MSMQ code will likely be a low priority. MSMQ offers a few different APIs: a Win32 unmanaged API, a COM-based API, and a managed API named System.Messaging. The best approach you can take today to ease future MSMQ migration is to work exclusively through the managed System.Messaging API.
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and the XML tag appender-ref references a message destination. The logger XML tag is a custom configuration definition, where the identifier is defined by the attribute name. When the attribute additivity is false, it means that the custom configuration doesn t inherit the default configuration details. The default is for the custom configuration to inherit from the root configuration. Log4net supports inheritance using the additivity attribute, allowing an administrator to log messages to multiple destinations simultaneously. Let s reconsider the previously defined custom configuration logger.tracer without the additivity attribute. When a message is generated, that message is generated in both the TracerAppender destination and the ConsoleAppender destination. For every message logged, two messages are generated. In contrast, when the additivity attribute is assigned a value of false, a single message is generated for the TracerAppender destination. For this example, the default configuration has a defined priority of ERROR, meaning that only messages having a priority of ERROR and higher are generated. Whenever an inherited custom configuration is defined, then the default priority of the custom configuration would be ERROR. In the preceding example, the custom definition logger.tracer has assigned the attribute additivity a false value, meaning that the default message priority level isn t inherited, and the custom configuration must define its own priority. For the example, the priority is ALL, indicating that all logging messages are to be generated. Configuration definitions reference a message destination, which is called a log4net appender. An appender defines the layout and filter for a message. Following is an example definition of the configuration reference appender-ref TracerAppender: <appender name="TracerAppender" type="log4net.Appender.ConsoleAppender"> <layout type="log4net.Layout.PatternLayout"> <param name="ConversionPattern" value="Tracer %m%n" /> </layout> </appender> The XML element appender requires two attributes: name and type. The name attribute is a user-friendly name of the message destination that s referenced in the logger or root XML tags. The type attribute is a class name that s loaded when a message is generated. For most cases, you ll use a log4net-defined implementation, but you could reference a custom class by implementing the proper interfaces. In the example, the class name log4net.Appender. ConsoleAppender references an appender that generates a message on the console. The following appenders are defined within the log4net package (note that all class names are prefixed with the namespace log4net.Appender): ADONetAppender: Appends the data to a SQL database using the ADO.NET API. You append the data using a prepared SQL statement or stored procedure. ASPNetTraceAppender: Appends messages to an ASP.NET trace context. BufferingForwardingAppender: A special type of forwarder that propagates the messages as events. The events are sent when you define a condition. ColoredConsoleAppender: The messages are appended to the standard output, or standard error output, but you can color or highlight specific message priorities. Remember that not all consoles support all color codes.
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Passing Mobile Objects by Reference
Using multiple threads in a program, called multithreading, or just threading, creates program overhead and additional program complexity. Here are some examples: There are time and resource costs in both creating and destroying threads. The time required for scheduling threads, loading them onto the processor, and storing their states after each time slice is pure overhead. Since the threads in a process all share the same resources and heap, it adds additional programming complexity to ensure that they re not stepping on each other s work. Debugging multithreaded programs can be quite difficult, since the timing on each run of the program can be different, producing different results. And the act of running the program in a debugger blows the timing out of the water.
Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 4 86.1 log file parallel write 66 0 6 7.8
The SelectObject event is raised when the web page needs data from the data source; the Roles object in this case. The page must handle the event and return the requested data object: protected void RolesDataSource_SelectObject( object sender, Csla.Web.SelectObjectArgs e) { ProjectTracker.Library.Admin.Roles obj = GetRoles(); e.BusinessObject = obj; } The GetRoles() helper method is called to retrieve the Roles collection object. Then the Roles object is returned to the RolesDataSource control by setting the e.BusinessObject property. The data source control then provides this object to the ASP.NET data binding infrastructure so it can be used to populate any UI controls bound to the data control. In this case, that s the GridView control in MainView. That control is declared like this: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="RolesDataSource" DataKeyNames="Id"> <Columns> <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="True" SortExpression="Id" /> <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" /> <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" /> </Columns> </asp:GridView> The DataSourceID property establishes data binding to the RolesDataSource control. The DataKeyNames property specifies the name of the property on the business object that acts as a primary key for the object. For a Role object, this is Id. Remember the use of the DataObjectField attribute on the Id property in 8, which provides a hint to Visual Studio that this property is the object s unique key value. The first two columns in the GridView control are bound to properties from the data source: Id and Name, respectively. The third column is a CommandField, which automatically adds Delete and Edit links next to each element in the list. The Delete link automatically triggers the DeleteObject to delete the specified object. The Edit link puts the row into in-place edit mode, allowing the user to edit the data in the selected row. If the user accepts their updates, the UpdateObject event is automatically raised. No code beyond that handling those events is required to support either of these links.
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