C#

// Pass by value (in, default), reference



//(in/out), and reference (out)



void TestFunc(int x, ref int y, out int z) {



  x++;



  y++;



  z = 5;



} 



















int a = 1, b = 1, c; // c doesn't need initializing



TestFunc(a, ref b, out c);



System.Console.WriteLine("{0} {1} {2}", a, b, c); // 1 2 5 











// Accept variable number of arguments



int Sum(params int[] nums) {



  int sum = 0;



  foreach (int i in nums)



    sum += i;



  return sum;



} 











int total = Sum(4, 3, 2, 1); // returns 10 











/* C# doesn't support optional arguments/parameters.



Just create two different versions of the same function. */



void SayHello(string name, string prefix) {



  System.Console.WriteLine("Greetings, " 
 + prefix + " " + name);



}







void SayHello(string name) {



  SayHello(name, "");



}

Exception Handling

VB.NET

'Deprecated unstructured error handling



On Error GoTo MyErrorHandler



...



MyErrorHandler: System.Console.WriteLine(Err.Description)







Dim ex As New Exception("Something has really gone wrong.")



Throw ex 











Try



  y = 0



  x = 10 / y



Catch ex As Exception When y = 0 'Argument and When is optional



  System.Console.WriteLine(ex.Message) 



Finally



  DoSomething() 



End Try

上一页  [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] 下一页