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Place XML Message Design Ahead of Schema Planning to Improve Web Service Interoperability Yasser Shohoud MSDN Magazine (December 2002) Located at MSDN Home MSDN Magazine December 2002
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Enabling 10046 Tracing Application Source Code May Be Modified
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The constraint flags describe the constraints imposed on a generic parameter that are not of an inheritance or implementation nature. Table 11-1 describes the constraint flags defined in version 2.0 of the CLR (see also enumeration CorGenericParamAttr in file CorHdr.h):
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Components of the .NET Framework
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The idea is to understand the ramifications of the refactoring. To make sure the test scripts don t fail, fix the source code, but not the test scripts. If the modifications seem too large and complex, maybe some responsibilities have been defined incorrectly. Following is the refactored Stream class: public interface ReadStream { void Close(); int Read(byte [] buffer, int offset, int count); int ReadByte(); long Position { get; set; } long Seek(long offset, System.IO.SeekOrigin origin); long Length { get; } } public interface WriteStream { void Close(); void SetLength(long value); void Write(byte [] buffer, int offset, int count); void WriteByte(byte value); void Flush(); } public interface ASynchronousReadStream : ReadStream { System.Threading.WaitHandle CreateWaitHandle(); System.IAsyncResult BeginRead(byte [] buffer, int offset, int count, System.AsyncCallback cback, object state); int EndRead(System.IAsyncResult async_result); } public interface ASynchronousWriteStream : WriteStream { System.Threading.WaitHandle CreateWaitHandle(); System.IAsyncResult BeginWrite(byte [] buffer, int offset, int count, System.AsyncCallback cback, object state); void EndWrite(System.IAsyncResult async_result); } There are four abstract base interfaces: ReadStream, WriteStream, ASynchronousWriteStream, and ASynchronousReadStream. The responsibilities have been divided into two categories: reader and writer responsibility. The asynchronous responsibility is an extension of the reader and writer base classes. Notice that the Stream abstract class has been converted into a number of interfaces. Interfaces are preferable to abstract base classes because they offer more flexibility. You might have been tempted to make the abstract base classes use .NET Generics. The idea would be to write a stream using one set of types. The problem is that no stream encompasses
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The web.config file also controls how the application uses the data portal. To have the website interact directly with the database, use the following (with your connection string changed to the connection string for your database): < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="CslaAuthentication" value="Csla" /> </appSettings> <connectionStrings> <add name="PTracker" connectionString="your connection string" providerName="System.Data.SqlClient" /> <add name="Security" connectionString="your connection string" providerName="System.Data.SqlClient" /> </connectionStrings> Because LocalProxy is the default for the data portal, no actual data portal configuration is required, so the only settings in the configuration file are to control authentication and to provide the database connection strings.
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Figure 4-4. Types supporting transactional technologies in the data portal
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You have to realize that the first query to touch the data will incur some additional processing if the block needs to be cleaned. Realizing this, you yourself should touch the data after the UPDATE. You just loaded or modified a ton of data you need to analyze it at the very least. Perhaps you need to run some reports to validate the load. This will clean the block out and make it so the next query doesn t have to. Better yet, since you just bulk-loaded the data, you now need to refresh the statistics anyway. Running the DBMS_STATS utility to gather statistics may well clean out all of the blocks as it just uses SQL to query the information and would naturally clean the blocks out as it goes along.
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Figure 2-13. The simple handler project item in the Add New Item dialog window The code template included for this file is a complete implementation of a handler, albeit not a very dramatic one. This code gets an image from the database and returns it as a binary stream. It also caches the images for 60 seconds, instead of going to the database for them on each request. <%@ WebHandler Language="C#" Class="MyHandler" %> using using using using using using System; System.Web; System.Web.Caching; System.Configuration; System.Data; System.Data.SqlClient;
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CHAPTER 27 LINQ TO OBJECTS
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0x18 0x19 0x1A 0x1B
You don t need to create an instance from the class before accessing a static field. You can just access it directly via the class name. You can get more information about static classes (classes that contain only static members) later in this chapter, static fields in 7, and static methods in 9.
In Listing 26-14, I used a directive to control conditional compilation of a call to a method. It can be pretty tedious and error-prone to apply directives to all the calls of a method in a real program. A more efficient way of achieving the same effect is to use the Conditional attribute, as demonstrated by Listing 26-15. Listing 26-15. Using the Conditional Attribute #define PRINT CALC DETAILS using System; using System.Diagnostics; class Listing 15 { static void Main(string[] args) { // perform some calculations int sumResult = CalculateSum(10, 20); Console.WriteLine("Sum result: {0}", sumResult); int productResult = CalculateProduct(10, 20); Console.WriteLine("Product result: {0}", productResult); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine();
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<BrowsableAttribute(True)> _ <DescriptionAttribute("The Status property will provide the status of the execution")> _ Public ReadOnly Property Status() As Boolean Get Return CType(MyBase.GetValue(ExecuteSQL.StatusProperty), Boolean) End Get End Property <DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility. Visible)> _ <ValidationOption(ValidationOption.None)> _ <BrowsableAttribute(True)> _ <DescriptionAttribute("The NewID property will provide the ID of the record inserted for an Insert statement")> _ Public ReadOnly Property NewID() As Integer Get Return CType(MyBase.GetValue(ExecuteSQL.NewIDProperty), Integer) End Get End Property Notice the first two properties have required a validation option and the last two don t. That s because the connection string and SQL statement are required, but the other two (Status and NewID) are output parameters and aren t required. The next step is to add a validation class, as was used in the earlier sections, to make sure the connection string and SQL Statement properties are provided. Add a new blank class to the project called ExecuteSQLValidator. The new class needs to inherit from System.Workflow.ComponentModel.Compiler.Activity Validator and override the ValidateProperties function as follows: Public Class ExecuteSQLValidator Inherits System.Workflow.ComponentModel.Compiler.ActivityValidator Public Overrides Function ValidateProperties(ByVal manager As ValidationManager, ByVal obj As Object) As ValidationErrorCollection Dim Errors As New ValidationErrorCollection Dim activity As ExecuteSQL = TryCast(obj, ExecuteSQL) End Function End Class Add code to validate that the connection string and SQL statement properties have been provided, as follows: Public Class ExecuteSQLValidator Inherits System.Workflow.ComponentModel.Compiler.ActivityValidator Public Overrides Function ValidateProperties (ByVal manager As ValidationManager, ByVal obj As Object) As ValidationErrorCollection Dim Errors As New ValidationErrorCollection Dim activity As ExecuteSQL = TryCast(obj, ExecuteSQL)
CHAPTER 12 ASSEMBLY STARTUP AND RUNTIME INITIALIZATION
CHAPTER 9 A WORKFLOW SMORGASBORD
The Exception Hierarchy
The named parameter feature allows you provide arguments to a method out of the order in which they have been specified. Listing 9-19 contains an example. Listing 9-19. Using Named Parameters using System; class Calculator { public int PerformCalculation(int x, int y = 10, int divisor = 2) { return (x * y) / divisor; } } class Listing 19 { static void Main(string[] args) { // create a new instance of Calculator Calculator calc = new Calculator(); int result = calc.PerformCalculation(y: 10, x: 120, divisor: 5); Console.WriteLine("Result: {0}", result); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The important part of this example is the call to the PerformCalculation method from the Listing 19.Main method. In this statement, I have changed the order in which I supply the parameter values by using the parameter name, followed by a colon (:), followed by the value I want to pass as a parameter. This may seem like a very odd thing to do, but it becomes quite useful when combined with optional parameters. In the Calculator class in Listing 9-19, the PerformCalculation method has two
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