qr code generator c# example The C# Language in Visual C#

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The C# Language
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static void Main() { // Here, MyCounter is used as a name for CounterCountDown MyCounter cd1 = new MyCounter(10); int i; do { i = cd1Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); MyCounter cd2 = new MyCounter(20); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); cd2Reset(4); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); } }
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The MyCounter alias is created using this statement:
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using MyCounter = CounterCountDown;
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Once MyCounter has been specified as another name for CounterCountDown, it can be used to declare objects without any further namespace qualification For example, in the program, this line
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MyCounter cd1 = new MyCounter(10);
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creates a CountDown object
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There can be more than one namespace declaration of the same name This allows a namespace to be split over several files or even separated within the same file For example, the following program defines two Counter namespaces One contains the CountDown class The other contains the CountUp class When compiled, the contents of both Counter namespaces are added together
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// Namespaces are additive using System; // Bring Counter into view using Counter;
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16:
N a m e s p a c e s , t h e P r e p r o c e s s o r, a n d A s s e m b l i e s
// Here is one Counter namespace namespace Counter { // A simple countdown counter class CountDown { int val; public CountDown(int n) { val = n; } public void Reset(int n) { val = n; } public int Count() { if(val > 0) return val--; else return 0; } } } // Here is another Counter namespace namespace Counter { // A simple count-up counter class CountUp { int val; int target; public int Target { get{ return target; } } public CountUp(int n) { target = n; val = 0; } public void Reset(int n) { target = n; val = 0; } public int Count() { if(val < target) return val++; else return target; } } } class NSDemo5 { static void Main() { CountDown cd = new CountDown(10);
PART I PART I PART I
Part I:
The C# Language
CountUp cu = new CountUp(8); int i; do { i = cdCount(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); do { i = cuCount(); ConsoleWrite(i + " "); } while(i < cuTarget); } }
This program produces the following output:
10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8
Notice one other thing: The directive
using Counter;
brings into view the entire contents of the Counter namespace Thus, both CountDown and CountUp can be referred to directly, without namespace qualification It doesn t matter that the Counter namespace was split into two parts
Namespaces Can Be Nested
One namespace can be nested within another Consider this program:
// Namespaces can be nested using System; namespace NS1 { class ClassA { public ClassA() { ConsoleWriteLine("constructing ClassA"); } } namespace NS2 { // a nested namespace class ClassB { public ClassB() { ConsoleWriteLine("constructing ClassB"); } } } } class NestedNSDemo { static void Main() {
16:
N a m e s p a c e s , t h e P r e p r o c e s s o r, a n d A s s e m b l i e s
NS1ClassA a = new NS1ClassA(); // NS2ClassB b = new NS2ClassB(); // Error!!! NS2 is not in view
PART I PART I PART I
NS1NS2ClassB b = new NS1NS2ClassB(); // this is right } }
This program produces the following output:
constructing ClassA constructing ClassB
In the program, the namespace NS2 is nested within NS1 Thus, to refer to ClassB, you must qualify it with both the NS1 and NS2 namespaces NS2, by itself, is insufficient As shown, the namespace names are separated by a period Therefore, to refer to ClassB within Main( ), you must use NS1NS2ClassB Namespaces can be nested by more than two levels When this is the case, a member in a nested namespace must be qualified with all of the enclosing namespace names You can specify a nested namespace using a single namespace statement by separating each namespace with a period For example,
namespace OuterNS { namespace InnerNS { // } }
can also be specified like this:
namespace OuterNSInnerNS { // }
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