migrating from VB.NET

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:

VB Code:

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

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

VB Code:

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

Thx in advance for any help.

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

VB Code:

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());

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

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

Code:

---

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):

Code:

---

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 :rolleyes: ) just read the MSDN Help .

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 ?

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

Code:

---

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

---

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

Quote:

---

Originally Posted by nemaroller

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

Code:

---

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..

Code:

---

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

---