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The Tasks in the examples so far in this chapter have worked in isolation. This is ideal for demonstrating the features of the TPL, but not at all realistic. Most of the time, you will need to share data between
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What Are Exceptions The try Statement The Exception Classes The catch Clause Examples Using Specific catch Clauses The catch Clauses Section The finally Block Finding a Handler for an Exception Searching Further Throwing Exceptions Throwing Without an Exception Object
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We could also have used an anonymous method in place of the lambda expression, as shown following. This is more verbose, though, and since lambda expressions are equivalent semantically and are less verbose, there s little reason to use anonymous methods anymore. class Program { static void Main( ) { int[] intArray = new int[] { 3, 4, 5, 6, 7, 9 }; Anonymous method Func<int, bool> myDel = delegate(int x) { return x % 2 == 1; }; var countOdd = intArray.Count(myDel); Console.WriteLine("Count of odd numbers: {0}", countOdd); } }
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For example, the following code shows the use of operators Count and First. Both operators take only a single parameter the reference to the IEnumerable<T> object. The Count operator returns a single value, which is the count of all the elements in the sequence. The First operator returns the first element of the sequence.
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If the user presses the S button, the dialog box will open, but the code will not halt on the line until the user has closed the dialog box. Your program will continue to run while the dialog box is being displayed on the screen. Once the user has made a selection and closed the dialog box, the FindStorageDevice method you specified as the first argument will be called. This means you ll have to define this method, or your compiler will complain: private void FindStorageDevice(IAsyncResult result) { StorageDevice storageDevice = Guide.EndShowStorageDeviceSelector(result); if (storageDevice != null) SaveGame(storageDevice); } The result of BeginShowStorageDeviceSelector is received as the argument by this method. If you pass this result to the Guide.EndShowStorageDeviceSelector method, you will get the selected data storage. However, if the user canceled the operation, the result will be null, so you have to check for this. If the resulting StorageDevice is valid, you pass this to the SaveGame method, which you ll define in a moment. But first, imagine what would happen if you also allowed the user to perform a second operation for which the user needs to specify a data location, such as when he should also be able to load data, for example. This would require you to define a second method, FindStorageDeviceForLoading, for example. A cleaner way would be to specify an identifier to your asynchronous call, which you can check for in the FindStorageDevice method. Your Update method would contain this block of code: KeyboardState keyState = Keyboard.GetState(); if (!Guide.IsVisible) { if (keyState.IsKeyDown(Keys.S)) Guide.BeginShowStorageDeviceSelector(FindStorageDevice, "saveRequest"); if (keyState.IsKeyDown(Keys.L)) Guide.BeginShowStorageDeviceSelector(FindStorageDevice, "loadRequest"); } As you can see, in both cases a dialog box will be displayed, which will call the FindStorageDevice method after it closes. The difference is that this time you re specifying an identifier, which you can check for in the FindStorageDevice method: private void FindStorageDevice(IAsyncResult result) { StorageDevice storageDevice = Guide.EndShowStorageDeviceSelector(result); if (storageDevice != null) { if (result.AsyncState == "saveRequest") SaveGame(storageDevice); else if (result.AsyncState == "loadRequest") LoadGame(storageDevice); } }
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It s a rare thing to be able to design a database specifically for an application. More often than not, the database already exists, and developers must deal with its existing design. At best, you might be able to add some new tables or columns. This is one reason why ORM is a key concept for object-oriented development. The object model designed earlier in the chapter matches the business requirements without giving any consideration to the database design. An important step in the development process is to create code that translates the data from the databases into the objects, and vice versa. That code will be included in s 17 and 18 as the business objects are implemented. In this chapter, let s create a database for use by the project-tracking application. One thing to note is that even though the database is created specifically for this application, the data model will not match the object model exactly. A good relational model and a good object model are almost never the same thing.
Impact on the UI Layer
public partial class Employee { } } The ASP.NET Dynamic Data system only looks for the name of the property, so it doesn t matter what type the property has. I have used object as the property type in my example. Once you have a property, you can apply attributes. We use the DisplayName attribute as we did for the table so that the following changes the names that will be used for the FirstName and LastName columns: [DisplayName("First Name")] public object FirstName { get; set; } [DisplayName("Last Name")] public object LastName { get; set; } You can hide a column by using the ScaffoldColumn attribute and passing false as the parameter, like this statement, which hides the BirthDate column: [ScaffoldColumn(false)] public object BirthDate { get; set; } If you update your metadata file to match Listing 34-3 and then build and run the project, the display for the Sales Staff table will change to reflect these changes, as illustrated by Figure 34-26.
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