Select Case
A beginner's look into the Select Case Structure . Comparing Select Case to If...ElseIf....End If.... This Tutorial is for beginner's .
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<font color="#FF0000">Comparing</font> <font color="#0000FF">Select Case</font> to <font color="#0000FF">If</font>...<font color="#0000FF">ElseIf</font>....<font color="#0000FF">End If</font>.... <p>Whenever possible try to use the <font color="#0000FF">Select Case</font> structure.<br> Reason's are as follow's ;<br> <font color="#FF0000">A</font><font color="#0000FF">></font> Better understandability of the code you just wrote.<br> <font color="#FF0000">B</font><font color="#0000FF">></font> Lead's to smaller coding structure's .<br> <font color="#FF0000">C</font><font color="#0000FF">></font> Will decrease the Informational Complexity of the <br> procedure by at least 10% ( This is a good thing ! )</p> <font color="#FF0000">D</font><font color="#0000FF">></font> Lead's to re-use-ability of your code . <p>For instance ;<br> Look at the following structure's :</p> <p><font color="#FF0000">A</font><font color="#0000FF">:</font> <br> <font color="#0000FF">Private Sub</font> DecisionStructuresCollide<font color="#0000FF">()</font><br> <font color="#0000FF">If </font>Text1.Text = 1 <font color="#0000FF">Then</font> <br> <font color="#008000">' Do something</font><br> <font color="#0000FF">ElseIf</font> Text1.Text = 2 <font color="#0000FF">Then </font><br> <font color="#008000">' Do something</font><br> <font color="#0000FF">End If</font><br> <font color="#0000FF">End Sub</font></p> <p>To use the above structure is messy and will <br> lead to relentlessly<br> repeated code , thus over-bloating your procedure.</p> <p><font color="#FF0000">B</font><font color="#0000FF">:</font><br> <font color="#0000FF">Private Sub</font> DecisionStructuresCollide<font color="#0000FF">()</font><br> <font color="#0000FF">Dim</font> sMyString <font color="#0000FF">As</font> <font color="#0000FF">String</font> <font color="#008000">' Build the Variable Structure</font><br> sMyString = Text1.Text <font color="#008000">' Pass the Text in Text1.Text into the Variable as a String</font><br> </p> <p><font color="#0000FF">Select Case</font> sMyString <br> <font color="#0000FF">Case 1</font> <font color="#008000">' Text1.Text Equaled 1</font><br> <font color="#008000">' Do Something</font><br> <font color="#0000FF">Case 2</font><font color="#008000"> ' Text1.Text Equaled 2</font><br> <font color="#008000">' Do Something else</font><br> <font color="#0000FF">Case Else</font> <font color="#008000">' Text1.Text Equaled something else so <br> ' we can still be flexible and do <br> ' something else. Although the Case <br> ' Else statement is not required</font></p> <p>SeeInCaseProcedureDoSomethingElse <font color="#008000">' Do Something else</font></p> <p><font color="#0000FF">End Select</font><font color="#008000"> ' Each Select Case Statement must be <br> ' accompanied with a closing End Select <br> ' statement </font> </p> <p><font color="#0000FF">End Sub</font></p> <p>Example <font color="#FF0000">B</font> is definately much cleaner code and much <br> easier to read , not to mention the benefit's from the<br> Informational Complexity being smaller.</p> <p>I'm not saying that in 100% of all cases should one use the<br> <font color="#0000FF">Select Case</font> Structure , however , whenever possible it <br> will lead to a much better coding practice that you would<br> automatically try to stick to and then if your procedure<br> cannot be done by using this structure , then you can fall <br> back onto the old <font color="#0000FF">If</font>.....<font color="#0000FF">ElseIf</font>......<font color="#0000FF">End If</font>...... routine.</p>
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