Distributed Architecture in visual C#.net

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The DataSource property is set to the RoleListBindingSource control discussed earlier. You can also just set up the data binding entirely from within the Edit Columns dialog, in which case RoleListBindingSource would be added by Visual Studio at this point, instead of manually like I demonstrated earlier. Also notice that the DisplayMember and ValueMember properties are set to appropriate values. DisplayMember indicates which property of the data source will be displayed to the user, while ValueMember indicates the property of the data source that will be associated with the Role property of the ProjectResource object in the grid s row. In other words, each row of the DataGridView represents a single ProjectResource object, which has a Role property of type int. That property is bound to the Role column in the grid, and is linked to the ValueMember property of the RoleList object. The end result is that the DisplayMember value corresponding to the ValueMember from the Role property is shown to the user. And if the user selects a different item, that item s ValueMember is used to set the Role property of the ProjectResource object.
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Trace.WriteLineIf(y == 0, "Second parameter is zero", "Error"); Trace.Unindent(); Trace.WriteLine("Exiting CalculateDivision Method", "Trace"); return x / y; } } class CalculatorTest { static void Main(string[] args) { // remove the default listener Trace.Listeners.Clear(); // create a new listener TextWriterTraceListener listener = new TextWriterTraceListener(Console.Out); // register our new listener Trace.Listeners.Add(listener); // create a new Calculator object Calculator calc = new Calculator(); // perform a calculation that we know will cause a problem int divisionResult = calc.CalculateDivision(10, 0); // write out the result Console.WriteLine("Division Result: {0}", divisionResult); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } You can see from the listing that you can use the Trace class exactly as you would the Debug class. Adding listeners is the same (and uses the same kind of listener class), the method signatures are the same, and the abilities to indent, provide categories, and evaluate conditions are the same. If we compile and run Listing 38-6, we can see that the output is the same: Trace: Entered CalculateDivision Method Parameters: Parameters are: 10 0 Error: Second parameter is zero Trace: Exiting CalculateDivision Method Unhandled Exception: System.DivideByZeroException: Attempted to divide by zero. at Calculator.CalculateDivision(Int32 x, Int32 y) in C:\Listing 06\Listing 06.cs:line 25 at CalculatorTest.Main(String[] args) in C:\ Listing 06\Listing 06.cs:line 44 Press any key to continue . . . The key difference between the Trace and Debug classes is that Trace statements are left in during compilation by default. I say by default, because you can actually enable and disable the Trace and Debug
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The group clause groups the selected objects according to some criterion. For example, with the array of students in the previous examples, the program could group the students according to their majors. The important things to know about the group clause are the following: When items are included in the result of the query, they re placed in groups according to the value of a particular field. The value on which items are grouped is called the key. Unlike the select clause, the group clause does not return an enumerable that can enumerate the items from the original source. Instead, it returns an enumerable that enumerates the groups of items that have been formed. The groups themselves are enumerable and can enumerate the actual items. An example of the syntax of the group clause is the following: group student by student.Major; Keyword Keyword For example, the following code groups the students according to their majors: static void Main( ) { var students = new[] // Array of objects of an anonymous type { new { LName="Jones", FName="Mary", Age=19, Major="History" }, new { LName="Smith", FName="Bob", Age=20, Major="CompSci" }, new { LName="Fleming", FName="Carol", Age=21, Major="History" } }; var query = from student in students group student by student.Major; foreach (var s in query) // Enumerate the groups. { Console.WriteLine("{0}", s.Key); Grouping key foreach (var t in s) // Enumerate the items in the group. Console.WriteLine(" {0}, {1}", t.LName, t.FName); } }
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CHAPTER 2: Responsive Social Gaming with RESTful Web Services
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out modifier out modifier MyMethod(out MyClass f1, out int f2) MyClass(); 25; 15; // Create an object of the class. // Assign to the class field. // Assign to the int param.
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Note Unlike C and C++, numbers in C# do not have a Boolean interpretation.
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1. Click and hold the Rectangle tool, and when you see the option for the Ellipse tool, select it.
A try statement affects code statements that appear between the try and catch keywords. Each code statement is executed in turn. If the statement doesn t throw an exception, then control moves to the next statement. If all the code statements have been executed, then control moves to the first code statement after the try block, skipping over the handler statements. If any of the statements does throw an exception, no further code statements are executed from the try statement, and the runtime looks for a handler that can deal with the exception. A handler can deal with an exception if the exception type declared in the catch clause is of the type of the exception that has been thrown or is a base type of the exception that has been thrown. In Listing 14-2, there is a handler for the NullReferenceException type. Exceptions of this type can be handled, but the runtime will have to continue looking for a handler for other exception types. When an exception is thrown, the runtime looks to see whether the current statement is enclosed by a try statement. If it is and there is a matching catch clause that will handle the exception, the handler statements are executed. The idea is that you use this opportunity to return your program to a state that will allow it to continue despite the exception. If the statement that caused the exception is not enclosed by a try statement or is enclosed by a try block that doesn t have a matching catch clause, then the method that called the current method is searched to see whether it contains an enclosing try statement with a matching catch clause. This process continues up the call stack until a match is found. If there is no match, then the default handler is used, which terminates the program. You can see how this works in Listing 14-3. Listing 14-3. Exception Handling using System; class Listing 03 { static void Main(string[] args) { try { MethodOne(); } catch (NullReferenceException ex) { Console.WriteLine("Exception: {0}", ex.Message); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } static void MethodOne() { Console.WriteLine("Start of MethodOne"); MethodTwo(); // print out a message - this statement will not // be reached because the previous statement calls // a method that throws an exception Console.WriteLine("End of MethodOne"); }
As with all value types, a variable of a struct type contains its own data. Consequently A variable of a struct type cannot be null. Two structs variables cannot refer to the same object. For example, the following code declares a class called CSimple, and a struct called Simple, and a variable of each. Figure 12-1 shows how the two would be arranged in memory. class CSimple { public int X; public int Y; } struct Simple { public int X; public int Y; } class Program { static void Main() { CSimple cs = new CSimple(); Simple ss = new Simple(); ...
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