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Artikel weiterlesen MCTS Exam 70-536 – COM Interop (514 words)

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Artikel weiterlesen MCTS Exam 70-536 – User Security and Data Security (682 words)

Declaration is the same.

Lookup<int,string> myLookup = new Lookup<int,string>();

vs.

Dictionary<int,string> myDic = new Dictionary<int,string>();

Furter Reading:

* A nice article about using ToDictionary and ToLookup in Linq can be found @blog.donnfelker.com

Now I found a solutions. Just add the following line at the beginning of your method /codeblock and you are fine:

C#

System.Threading.Thread.CurrentThread.CurrentUICulture =
     new System.Globalization.CultureInfo("de-DE");

VB.net

System.Threading.Thread.CurrentThread.CurrentUICulture = _
     New System.Globalization.CultureInfo("de-DE")

Just two steps:

Step1 – Create a new Module called for example “StringExtensions.vb” and add an Import –Statement for System.Runtime.CompilerServices

Step2 – Write your Extension Method, and put an <Extension()> directive on top. Here is an example:

<Extension()> _
    Public Function AddAbcX(ByVal mystring As String) As String
        Return myString + "ABC"
    End Function

Notice the _ behind the directive. Don’t forget this one.

You notive one additional thing. A while ago I read an article about Extension Methods and got the suggestion to add an X to each methodname.
So, if using intellisense, you will see directly if the method you’re about to call is an Extension Method or a build-in Method. Good idea I think.

Another suggestion – Put the method in the same namespace as the object it belongs to (I said namespace, not file!).

So you have your methods ready when you start using the object.

Cheers

Sascha

I wish all of you a relaxing and successful 2010. See you on the other side )

Sascha

Cheers

Sascha

I just checked, and found that now everyone can download the new Beta 2 of VS2010 and .NET Framework 4. Have fun trying, I know I will.

Download: Microsofts Visual Studio Page

For the fact that I’m faster in reading then in wring, I made a lot of progress in exam preparation and I’m a bit behind with my notes. Anyway, I share my notes about this topic with you today

General

• Using Generics can improve performance by reducing the number of cast-operations.
• Common generic Collections:
  1. List<T>
     Comparable to StringCollection and ArrayList
  2. Dictionary<T,U>
     Comparable to NameValueCollection, StringDictionary,OrderedDictionary,HybridDictionary, ListDictionary and Hashtable
  3. Queue<T>
     Comparable to normal Queue
  4. Stack<T>
     Comparable to normal Stack
  5. SortedList<T, U>
     Comparable to normal SortedList
  6. Collection<T>
     Comparable to CollectionBase
  7. ReadOnlyCollection<T>
     Comparable to ReadOnlyCollectionBase
• You can Use Generics with any build in and Custom Type
• Is’nt there more ? Lots of code samples which are not part of my notes )

today I start with Collections and Dictionaries during my MCTS exam-preparation. As usual I provide my notes on that topic as a little help and motivation for other students.

Collections

• namespaces where we find Collections are System.Collections and System.Collections.Specialized
• Collectionstypes are:
  1. ArrayList – stores any type of object, expands as required. Accessable by zero based index or within a foreach_loop. Use .Add, .AddRange, .Remove, .Insert and .Sort (Objects need to implement IComparable), .Reverse (Reverse current order)
  2. Queue – First in, First out (FIFO) collection. Use .Enqueue and .Dequeue to add and remove objects and .Peek to lookup an object on a specified position. Use .Clear to remove all objects
  3. Stack – Last in, First out (LIFO) collection. Use .Push and .Pop to add and remove objects and .Peek to loopup an object on a specified position. Use .Clear to remove all objects
  4. StringCollection – As ArrayList, but strongly typed for strings, does not support sorting
  5. BitArray / BitVector – Collection of boolean values. BitVector is limited to 32 bits, BitArray stores more.

Dictionaries