migrating from VB.NET

[zildjohn01]

hi all,
i migrated from VB.NET to C# about a week ago, and there are two things i cannot figure out how to do in C#. If anyone could help me out this would be much appreciated.

1. How to create a property (besides "this") with indexers. For example in VB:

Property MyProp(ByVal param1 As Integer, ByVal param2 As Integer) As Object
    ...
End Property

2. How to do a 'ReDim Preserve' in C# code.

Dim asdf(1023) As Byte
ReDim asdf(2047)

Thx in advance for any help.

[fret]

dunno much this but try this one, because i'm not a good coder also.

int[] tempArray = new int[]{1,2,3}; 
            int newsize = tempArray.Length;
            int[] i = new int[newsize];
            'redim preserve the value of tempArray to i.
            System.Array.Copy(tempArray,i,tempArray.Length);
            for(int j=0;j<i.Length;j++)
                MessageBox.Show(i[j].ToString());

[StrangerInBeijing]

No Redim in C#..Just read it last week, so talking from the top of my head.
Got to copy to a new array with the new size or something like that

[Pirate]

To redim an array , just redefine its total number of elements like this :

Byte[] b=new byte[10];
			MessageBox.Show("Before =" + b.Length.ToString());
//Redim the array 
			b=new byte[30];
			MessageBox.Show("After =" + b.Length.ToString());

For the Indexer question , see how it's done (from MSDN):

using System;
class IndexerClass 
{
   private int [] myArray = new int[100]; 
   public int this [int index]   // Indexer declaration
   {
      get 
      {
         // Check the index limits.
         if (index < 0 || index >= 100)
            return 0;
         else
            return myArray[index];
      }
      set 
      {
         if (!(index < 0 || index >= 100))
            myArray[index] = value;
      }
   }
}



//Usage 
public class MainClass 
{
   public static void Main() 
   {
      IndexerClass b = new IndexerClass();
      // Call the indexer to initialize the elements #3 and #5.
      b[3] = 256;
      b[5] = 1024;
      for (int i=0; i<=10; i++) 
      {
         Console.WriteLine("Element #{0} = {1}", i, b[i]);
      }
   }
}

If you don't understand (I'm a bad teacher ) just read the MSDN Help .

[zildjohn01]

about the indexers, i can create one using 'this', but is it possible to create one using a identifer (i.e. public int MyProp[int param1, string param2] {get {...) ? So you can use IndexerClass.MyProp[2,"str"] = 5 ?

[nemaroller]

Here's a helpful method that simulates Redim Preserve in VB for a byte array.

private static byte[] Redim(byte[] OriginalArray, int DesiredSize)
{ 
  byte[] DestinationArray = new byte[DesiredSize]; 
  Array.Copy(OriginalArray, DestinationArray, DesiredSize-1); 
  return DestinationArray; 
}

[zildjohn01]

hi all, thanks for your help.

i would like to share something i accidentally stumbled on about this problem: calls to ReDim Preserve are actually calls to the Microsoft.VisualBasic namespace so naturally not supported in C#. If you would like to see more details i made a post in the VB.NET forums. The link is http://www.vbforums.com/showthread.p...13#post2011613

btw thanks all for your help with this

[<ABX]

Here's a helpful method that simulates Redim Preserve in VB for a byte array.

private static byte[] Redim(byte[] OriginalArray, int DesiredSize)
{ 
  byte[] DestinationArray = new byte[DesiredSize]; 
  Array.Copy(OriginalArray, DestinationArray, DesiredSize-1); 
  return DestinationArray; 
}

Couldnt that be modified to work with all arrays...

eg..

private static Array Redim(Array OriginalArray, int DesiredSize)
{ 
	Array DestinationArray = new Array[DesiredSize]; 
	Array.Copy(OriginalArray, DestinationArray, DesiredSize-1); 
	return DestinationArray; 
}