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| Both sides previous revisionPrevious revisionNext revision | Previous revision |
| trycatch [2018/01/28 07:30] – wolfgangriedmann | trycatch [2018/08/20 04:05] (current) – wolfgangriedmann |
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| ====== Try - Catch ====== | ====== Try - Catch ====== |
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| The ''Try - Catch'' block is very important, and should be used where an error can occurr, for example if a file that needs to be read does not exist, you are specifying an invalid path, the current user has not the rights to read and so forth - please read the documentation about [[https://docs.microsoft.com/en-us/dotnet/api/system.io.file.readalltext|System.IO.File.ReadAllText()]] to see what type of exceptions there are. | The ''Try - Catch'' block is very important, and should be used where an error can occur, for example if a file that needs to be read does not exist, you are specifying an invalid path, the current user has not the rights to read and so forth - please read the documentation about [[https://docs.microsoft.com/en-us/dotnet/api/system.io.file.readalltext|System.IO.File.ReadAllText()]] to see what type of exceptions there are. |
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| In classic VO and Win32 applications, you had to check the return value of an operation, and then eventually ask for more details. | In classic VO and Win32 applications, you had to check the return value of an operation, and then eventually ask for more details. |
| The .NET Framework works differently: it produces an exception, and it is the programmers responsability to treat it correctly. | The .NET Framework works differently: it produces an exception, and it is the programmers responsability to treat it correctly. |
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| A sample:<code>using System.IO | A sample:<code visualfoxpro>using System.IO |
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| function TestException() as void | function TestException() as void |
