Extracting single dimensional array out of two dimensional array - CSharp

Mukesh <cmukesh19@gmail.com> wrote:
> I am using framework 2.0. I am writing a foreach loop that will
> extract single dimensional arrays out of double dimensional array. I
> am trying writing something like this.
>
> string [,] strDetails
> foreach(string[] str in strDetails)
> {
> //Code comes here
> }
>
> I have studied that it is not possible to do like this. The maximum
> we can do is extracting individual values in the array.
> Any comments? Opinions? Solutions?

That's correct.

If you can produce a string[][] (an array of string arrays) instead,
it's a lot easier.

How much of what you want to do is fixed? Do you definitely need a
string[], or just (for example) an IEnumerable<string>?

--
Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Having a jagged array can help in this.
string[][] strDetails

I think, foreach (string[]... ) should work in such a case.

On Oct 24, 2:33 pm, Mukesh <cmukes...@gmail.com> wrote:
> Hi,
> I am using framework 2.0. I am writing a foreach loop that will
> extract single dimensional arrays out of double dimensional array. I
> am trying writing something like this.
>
> string [,] strDetails
> foreach(string[] str in strDetails)
> {
> //Code comes here
>
> }
>
> I have studied that it is not possible to do like this. The maximum
> we can do is extracting individual values in the array.
> Any comments? Opinions? Solutions?
> Thanks
> Chakravarti Mukesh

Mukesh wrote:
> I am using framework 2.0. I am writing a foreach loop that will
> extract single dimensional arrays out of double dimensional array. I
> am trying writing something like this.
>
> string [,] strDetails
> foreach(string[] str in strDetails)
> {
> //Code comes here
> }
>
> I have studied that it is not possible to do like this. The maximum
> we can do is extracting individual values in the array.
> Any comments? Opinions? Solutions?

For some options:

using System;

namespace E
{
public class Program
{
public static void Main(string[] args)
{
int[,] a = new int[3,3];
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
a[i,j] = 3*i+j+1;
}
}
int[] a1 = new int[3];
Buffer.BlockCopy(a, 3*sizeof(int), a1, 0, 3*sizeof(int));
Console.WriteLine(a1[0] + " " + a1[1] + " " + a1[2]);
int[][] b = new int[3][];
for(int i = 0; i < 3; i++)
{
b[i] = new int[3];
for(int j = 0; j < 3; j++)
{
b[i][j] = 3*i+j+1;
}
}
int[] b1 = b[1];
Console.WriteLine(b1[0] + " " + b1[1] + " " + b1[2]);
Console.ReadKey();
}
}
}

Arne

Mukesh wrote:
> [...]
> string [,] strDetails
> foreach(string[] str in strDetails)
> {
> //Code comes here
> }
>
> I have studied that it is not possible to do like this. The maximum
> we can do is extracting individual values in the array.

Well "strDetails" isn't an array of arrays; it's a single
two-dimensional array. So that's why you can't enumerate the "string[]"
instances in the "strDetails" array. There aren't any.

That said, there's nothing to stop you from iterating over a single
dimension of the two-dimensional array, and then within that iterating
over the other dimension for the purpose of building a new
single-dimensional array of strings.

Something like this:

string[,] strDetails;

for (int i = 0; i < strDetails.GetLength(0); i++)
{
string[] str = new string[strDetails.GetLength(1)];

for (int j = 0; j < str.Length; j++)
{
str[j] = strDetails[i, j];
}

// do something with str here
}

Pete

Arne Vajhøj wrote:
> Mukesh wrote:
>> I am using framework 2.0. I am writing a foreach loop that will
>> extract single dimensional arrays out of double dimensional array. I
>> am trying writing something like this.
>>
>> string [,] strDetails
>> foreach(string[] str in strDetails)
>> {
>> //Code comes here
>> }
>>
>> I have studied that it is not possible to do like this. The maximum
>> we can do is extracting individual values in the array.
>> Any comments? Opinions? Solutions?
>
> For some options:
> ...

Note that the block copy does not work for strings and therfore
is not applicable to your problem.

Arne