By 3 Leaf Solutions, Sean Campbell
Advisor offers statement on one zero one totally executable code samples. every one code pattern demonstrates middle positive aspects and services of visible uncomplicated .NET and the .NET Framework, explains the underlying programming ideas, and gives a whole code walkthrough. For starting and intermediate .NET builders and visible uncomplicated 6 builders. Softcover.
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Other features of SEH include: • The ToString method combines the name of the exception, the error message, the stack trace, and more. • There’s no equivalent for On Error Resume Next. • You can jump out of a Try/Catch with an Exit Try or GoTo statement, but code in your Finally block will still be executed. • You can omit the Catch block if you have a Finally block. • You can create your own exceptions. ) • SEH can even handle exceptions generated by unmanaged code. NET runtime walks back up the call stack looking for an active exception handler.
DateTime Calculation Methods DateTime instances permit a variety of calculations whose methods begin with Add. To subtract, simply pass a negative number as the parameter (or use the Subtract method). Most of the calculation methods are self-explanatory and most require a Double data type as a parameter, which means you can add or subtract fractional numbers&"emphasis">AddMonths and AddYears, which require Integers, and AddTicks, which accepts a Long value. AddHours(CDbl(txtHours. AddTicks(CLng(txtTicks.
In Visual Basic 6, you probably constructed your error handlers something like this: Sub Foo() On Error GoTo ErrHandler ' Code that could fail ExitHere: ' Close database connections, delete Exit Sub ErrHandler: 'Handle the error Resume ExitHere End Sub temp files, etc. This is a classic example of spaghetti code. First you jump to the ErrHandler label if there’s an error, and then after handling the error, you jump back to ExitHere to make sure you clean up any resources in use. Finally, you exit the procedure with the Exit Sub statement.
101 Microsoft Visual Basic .NET Applications by 3 Leaf Solutions, Sean Campbell