Archive for the ‘VB.NET 8.0’ Category
Posted by jpluimers on 2015/08/05
Every C#/VB/.NET developer should read Difference Between Int32.Parse, Convert.ToInt32, and Int32.TryParse – CodeProject .
Then also read TryParse with default values .
It is all about handling values that are not Integers, Overflow values and Nulls. There are subtle differences, in the handling of the methods, and the exceptions they could throw: ArgumentNullException , FormatException and OverflowException .
Finally read all about the NumberStyles enumeration, IFormatProvider interface and CultureInfo (especially the difference between InvariantCulture , CurrentCulture , CurrentUICulture and InstalledUICulture ).
Because getting your conversions right matters.
–jeroen
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Posted by jpluimers on 2015/06/18
Inversion of Control example video on YouTube : business class is not in control of the DAL.
It uses C#, but the code is so simple that every programmer should be able to get it.
Uses:
interfaces
parameter passing through constructor
moving control decisions out of the business class
Inversion of Control (IoC) can later be amended by Dependency Injection (DI), but IoC can easily without that be used very effectively without DI.
I wish the What is…? series had more than 1 episode, but Christian Richards does have some interesting series about game development .
–jeroen
via: duidelijk voorbeeld .
VIDEO
VIDEO
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Posted by jpluimers on 2014/12/24
Once every while you still do WinForms work, and bump into something you hadn’t bumped into before.
This time it was trying to set ForeColor = Color.Red on a ReadOnly TextBox for displaying error messages:
Using a TextBox means the user can still copy the text to the clipboard.
Using a Red foreground draws enough attention (it’s was an app with a really busy user interface).
When setting a TextBox from ReadOnly = false to true sets the BackColor from SystemColors.Window (usually white) to SystemColors.Control (usually light grey), and leaves the ForeColor to SystemColors.WindowText (usually black).
Setting ForeColor = Color.Red (funny there is a plural in SystemColors but not in Color ) it doesn’t display it as such:
To my surprise, the TextBox had ReadOnly text (you could copy, but not modify it), which showed with a a grey (SystemColors.Control) BackColor and a black (SystemColors.WindowText) ForeColor: the defaults for a ReadOnly TextBox, not using my ForeColor = Color.Red;
I vaguely remembered there was some odd way of solving this, but since I hadn’t written a blog article about it back then (somewhere around .NET 1.x or 2.0 I didn’t have a blog yet), I was glad that Cheetah posted this answer on StackOverflow : Read the rest of this entry »
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Posted by jpluimers on 2014/12/16
Two ways to do a case insensitive string replace without using RegEx (which often is not a solution ).
Thanks User Tim Schmelter for pointing me at those.
–jeroen
via: Is there a case insensitive string replace in .Net without using Regex? – Stack Overflow .
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Posted by jpluimers on 2014/11/04
Normally you would not want to use a reserved word as an identifier. But sometimes it can be very convenient, for instance for a code generator that wraps remoting calls or does ORM.
Both Delphi and C# have an escape for this:
The prefixes are to tell the compiler knows you really know what you are doing, and are using a reserved word as an identifier.
The cool thing: in the Run Time Type Information (Delphi) or Reflection (C# and VB.NET) you will see the names without the prefix.
Some examples from StackOverflow: Read the rest of this entry »
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