Complete set: Intro to C - Bill Buchanan

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5.13 Exceptions Tutorial duction to .NET Intro Tasks. 1) Try the Megalomania solution. Observe that we have a Class file Country and a user interface Megalomania. We will try to keep the two parts of the system separate. Observe the action of two existing buttons. 2) Trivial change to the user interface: a) Add a new label to the project. b) Change the action of the ʺUpdate worldLBʺ button so that the new label shows a count of the number of items in worldLB. (worldLB.Items.Count contains the number you need). c) Check that the change works. 3) Trivial change to Country.cs: a) Change the ToString method to include some more spaces in the format string. This should make the text box contents easier on the eye. 4) Break the data 1: a) Edit the file ciaFixedWidth.txt so that it includes a country with a non‐numeric where a numeric value is expected. For example ʺAndrew Land Europe 0 1 nixʺ Observe that a run time error occurs when you try to load the file. b) Enclose a section of code in a try block so that processing continues and such duff lines are ignored. c) Report the error by writing an appropriate message using the System.Diagnostics.Trace.WriteLine method. 5) Break the data 2: a) Change the file name of ciaFixedWidth.txt so that a different run time error is generated. b) Trap this error with a wider try block. We cannot continue with the routine after such an error to an alert should be generated with an appropriate MessageBox with an appropriate icon. 6) Generalise the file open procedure: a) Allow the user to specify the location of the CIA file – use the open file dialog control. b) For the purposes of the next question you must ensure that the file dialog permits you to enter files that do not exist and illegal file names. You need to change three properties to allow this. 7) Allow some exceptions to be unhandled. a) We want to ensure that only the ʺFile not foundʺ exception is caught. If the Agilent .NET Course: Module 5, page 12
user enters an illegal filename (such as ʺ6:abcʺ) we want the exception to go uncaught – in the debug environment the debugger starts. i) Identify the exception we want to catch (you can set a breakpoint and use the local window for this). ii) Ensure the catch is specific to this exception only. iii) Check your program completes successfully when given a good file name. iv) Check your program gives a fatal warning when given a file that does not exist. v) Check that your program generates an unhandled exception when given an illegal file name. Introduction to .NET Agilent .NET Course: Module 5, page 13
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Name: Course: Introduction to .NET
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Thus, we have three choices of shap
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Finally, for this section, Program
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1.3.1 Win32 API The Win32 API libra
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VB VB ASP ASP ASP ASP VBA VBA VB VB
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Volume in drive C has no label. Vol
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Module01_01.sln Module01_01.sln Mic
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1.4.2 Using the environment Figure
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Figure 1.17: Object browsing for ot
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1.6 Basic elements of a C# program
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System.Console.Write("Enter real va
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2 Module 2 Basics of C# 2.1 Introdu
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2.4 Casting Objects Sometimes we ne
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2.6 The Convert class The convert c
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2.7.1 Examples of output of the Dat
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2.9 StreamReader The StreamReader c
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2.11 CIA tutorial (1) In this tutor
Page 35 and 36: 3 Arrays and Collections 3.1 Introd
Page 37 and 38: inputValues = new double[5]; which
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Page 41 and 42: 3.3 Reading from a CSV file One of
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Page 49 and 50: Sample Run 3.8 Average is 4.7142857
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Page 89 and 90: 5.15 Methods Tutorial We return to
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Page 99 and 100: choices of handle type (small or la
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Page 105 and 106: Mammals Increasing generalisation C
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Page 115 and 116: Sample Run Name: fred Name: FRED Ob
Page 117 and 118: 8 More Objects 8.1 Introduction Thi
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Page 131 and 132: 10 Day 5 pm 10.1 Contents Morning s
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uk.Gdp = 1000000000; int c = uk.Reg
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We keep a record of the country tha
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10.9 Tutorial duction to .NET Intro
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Complete set: Intro to C - Bill Buchanan

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