c# pdf417 barcode s DATA ACCESS AND SECURITY in visual C#

Integrate pdf417 in visual C# s DATA ACCESS AND SECURITY

would make sense to range partition by. However, you would still like to take advantage of the administrative, performance, and availability enhancements offered by partitioning. Here, you would simply pick a unique or almost unique set of columns to hash on. This would achieve an even distribution of data across as many partitions as you like. Hash partitioned objects can take advantage of partition elimination when exact equality or IN ( value, value, ... ) is used, but not when ranges of data are used. List partitioning is suitable for data that has a column with a discrete set of values, and partitioning by the column makes sense based on the way your application uses it (e.g., it easily permits partition elimination in queries). Classic examples would be a state or region code or, in fact, many code type attributes in general. Composite partitioning is useful when you have something logical by which you can range partition, but the resulting range partitions are still too large to manage effectively. You can apply the range, list, or hash partitioning and then further divide each range by a hash function or use lists to partition or even ranges. This will allow you to spread I/O requests out across many devices in any given large partition. Additionally, you may achieve partition elimination at three levels now. If you query on the partition key, Oracle is able to eliminate any partitions that do not meet your criteria. If you add the subpartition key to your query, Oracle can eliminate the other subpartitions within that partition. If you just query on the subpartition key (not using the partition key), Oracle will query only those hash or list subpartitions that apply from each partition. It is recommended that if there is something by which it makes sense to range partition your data, you should use that over hash or list partitioning. Hash and list partitioning add many of the salient benefits of partitioning, but they are not as useful as range partitioning when it comes to partition elimination. Using hash or list partitions within range partitions is advisable when the resulting range partitions are too large to manage or when you want to use all PDML capabilities or parallel index scanning against a single range partition.

Sometimes, an application may need an object that provides data in a read-only fashion. For a readonly list of data, there s ReadOnlyListBase; however, if the requirement is for a single object containing read-only data, it should inherit from ReadOnlyBase. This is one of the simplest types of objects to create, since it does nothing more than retrieve and return data, as shown here:

For now, the Process method simply calls the Process method of its base class, the default MaterialProcessor, to do its job. Of course, you ll want to change this so you can influence how the MaterialContent is processed. For now, change the contents of the Process method to this: EffectMaterialContent myMaterial = new EffectMaterialContent(); string map = Path.GetDirectoryName(input.Identity.SourceFilename); string effectFile = Path.Combine(map, "colorchannels.fx"); myMaterial.Effect = new ExternalReference<EffectContent>(effectFile); This will create an empty EffectMaterialContent object and will store a link to an effect file of your choice in it. You do this by first finding the map where the Model is stored and then appending the name of your effect file to it. When the compiler reaches this line, it will add the effect to the list of assets that need to be loaded. This will result in the effect being automatically loaded using the default EffectProcessor of the XNA Framework; all you have to do is make sure the effect file is stored in the same directory as the model. Most models carry textures, which you need to transfer from the original MaterialContent object to the new one. The effect used in this example samples color from a texture, called xTexture, and allows you to set the strength of the red, green, and blue color components individually. Most models come with only one texture per effect, while others use multiple textures (for example, a bump map, as explained in recipe 5-15). Unrelated to the number of textures used by the original effect, this code will feed only the last texture to the xTexture variable of my sample effect, but the code shows you how you can scroll through multiple textures. You can access the Textures collection of the original effect and bind these textures to HLSL texture variables of your custom effect: if (input.Textures != null) foreach (string key in input.Textures.Keys) myMaterial.Textures.Add("xTexture", input.Textures[key]); If you feel the need to adjust some of the HLSL parameters while loading the Model, this is how to do it:

Some of your appointments happen every day, week, or month at the same time. Follow these steps if you are scheduling a repeating or recurring appointment: 1. Touch the Repeat tab and then select the correct time interval from the list. Touch Done to return to the main Event screen.

static void Main(string[] args) { // create a TimeSpan value TimeSpan myDuration = new TimeSpan(14, 23, 12, 20); string customRep = myDuration.ToString("d' days, 'h' hours and 'm' minutes'"); // write the custom representaion to the console Console.WriteLine("Custom format: {0}", customRep); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 22-7 uses a custom format string as a parameter to the TimeSpan.ToString method; the letters d, h and m are detected by the composite formatting system and converted into the number of days, hours, and minutes that the TimeSpan represents. Compiling and running Listing 22-7 produces the following results: Custom format: 14 days, 23 hours and 12 minutes Press enter to finish Table 22-7 describes the most commonly used components for a custom TimeSpan formatting string. Table 22-7. TimeSpan Custom Format Components

Rebuild the solution and press F5 (or Ctrl + F5 if you don t want Visual Studio to break on FaultException) and enter some string that does not match the title of any book we previously stored in the books array and press the Get Book detail button. Notice that this time a custom fault occurred at the GetBookInfo WCF service level, and a custom Book not found message is displayed rather than the default Not found message.

Project, as I am doing in Figure 13-1.

Figure 9-8. Example of panning by location (set by latitude/longitude to the Chicago area)

To understand delegates, it is helpful to first concentrate on the similarity to C++ function pointers. In C++, there are two function pointer concepts. From its C roots, C++ inherits the normal function pointer. A typedef for such a function pointer typically looks like this: // PFN is a pointer to a boolean function with an int argument typedef bool (*PFN)(int); Such a function pointer can target global functions and static functions of native C++ classes. To target non-static functions of native C++ classes, a second pointer concept is necessary, since non-static functions have a hidden argument for the this pointer. This kind of function pointer is called a pointer-to-member function. The following code shows two such pointers, one for member functions of a native type T1 and one for a type T2: // PT1FN is a pointer to a boolean member function of T1 with an int argument typedef bool (T1::*PT1FN)(int); // PT2FN is a pointer to a boolean member function of T2 with an int argument typedef bool (T2::*PT2FN)(int); Delegates unify the concept of C function pointers and C++ pointers-to-member functions. The syntax to define delegates is very similar to the native function pointer syntax. public delegate void SampleDelegate(int); For this one line of code, the C++/CLI compiler generates a type, as shown in Figure 5-8.

Alex Mackey (Author of this book and MVP)