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As the output shows, the value of objCount has been initialized to 100 and the value of objStr has been initialized to Testing Notice, however, that MyClass does not define any explicit constructors, and that the normal constructor syntax has not been used Rather, obj is created using the following line:
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MyClass obj = new MyClass { Count = 100, Str = "Testing" };
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Part I:
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Here, the names of the fields are explicitly specified along with their initial values This results in a default instance of MyClass being constructed (by use of the implicit default constructor) and then Count and Str are given the specified initial values It is important to understand that the order of the initializers is not important For example, obj could have been initialized as shown here:
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MyClass obj = new MyClass { Str = "Testing", Count = 100 };
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In this statement, the initialization of Str precedes the initialization of Count In the program, it was the other way around However, in either case, the end result is the same Here is the general form of object initialization syntax: new class-name { name = expr, name = expr, name = expr, } Here, name specifies the name of a field or property that is an accessible member of classname Of course, the type of the initializing expression specified by expr must be compatible with the type of field or property Although you can use object initializers with a named class (such as MyClass in the example), you usually won t In general, you will use the normal constructor call syntax when working with named classes As mentioned, object initializers are most applicable to anonymous types generated by a LINQ expression
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The Main( ) Method
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Up to this point, you have been using one form of Main( ) However, it has several overloaded forms Some can be used to return a value, and some can receive arguments Each is examined here
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Return Values from Main( )
When a program ends, you can return a value to the calling process (often the operating system) by returning a value from Main( ) To do so, you can use this form of Main( ): static int Main( ) Notice that instead of being declared void, this version of Main( ) has a return type of int Usually, the return value from Main( ) indicates whether the program ended normally or due to some abnormal condition By convention, a return value of zero usually indicates normal termination All other values indicate some type of error occurred
Pass Arguments to Main( )
Many programs accept what are called command-line arguments A command-line argument is the information that directly follows the program s name on the command line when it is executed For C# programs, these arguments are then passed to the Main( ) method To receive the arguments, you must use one of these forms of Main( ): static void Main(string[ ] args) static int Main(string[ ] args) The first form returns void; the second can be used to return an integer value, as described in the preceding section For both, the command-line arguments are stored as strings in the
8:
A Closer Look at Methods and Classes
string array passed to Main( ) The length of the args array will be equal to the number of command-line arguments, which might be zero For example, the following program displays all of the command-line arguments that it is called with:
// Display all command-line information using System; class CLDemo { static void Main(string[] args) { ConsoleWriteLine("There are " + argsLength + " command-line arguments"); ConsoleWriteLine("They are: "); for(int i=0; i < argsLength; i++) ConsoleWriteLine(args[i]); } }
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