Throw-Exception.ps1

1. <# 
2. .SYNOPSIS 
3.    Shows throwing an exception in a function, caught in caller.   
4. .DESCRIPTION 
5.     This is a re-written MSDN Sample 
6. .NOTES 
7.     File Name  : throw-exception.ps1 
8.     Author     : Thomas Lee - tfl@psp.co.uk 
9.     Requires   : PowerShell V2 CTP3 
10. .LINK 
11.     Original script at: 
12.     http://pshscripts.blogspot.com/2009/01/throw-exceptionps1.html
13.     MSDN Sample at: 
14.     http://msdn.microsoft.com/en-us/library/1ah5wsex.aspx  
15. .EXAMPLE 
16.     PS C:\foo> .\Throw-Exception.ps1 
17.     Num[0] - Result = 300 
18.     Trying to get Num[4] 
19.     In catch block 
20.     Error caught: System.IndexOutOfRangeException 
21. #> 
22.  
23. ### 
24. #  Start of script 
25. ### 
26.  
27.  
28. # Helper function 
29. function GetNumber{ 
30.  param ($index) 
31.  $nums = 300, 600, 900 
32.  if ($index -gt $nums.Length) { 
33. Throw [system.IndexOutOfRangeException] 
34. } 
35.  else { 
36.  $nums[$index] 
37. } 
38. } 
39.  
40. # Start of main script 
41.  
42. # Get one that works... 
43. $result = GetNumber 0 
44. "Num[0] - Result = {0}" -f $result 
45.  
46. # Now try and catch the following 
47. try { 
48. "Trying to get Num[4]" 
49. $result = GetNumber 4 
50. } 
51. Catch { 
52. "In catch block" 
53. "Error caught: {0}" -f $Error[0] 
54. } 

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