foreach for array filling

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Hi,

I´m new to C#.
I want to use foreach instead of for.

Coding with for:

C#

String[] properties = new String[] { "co", "extensionAttribute1", "mail" , "homeMDB"};
String[] result = new String[] {};

for (int i = 0; i < properties.Length; i++)
      {
         searcher.PropertiesToLoad.Add( properties[i] );
      }

SearchResult searchresult = searcher.FindOne();

for (int j = 0; j < properties.Length; j++)
            {
                if (searchresult.Properties.Contains(properties[j]))
                {
                    if (searchresult.Properties[properties[j]][0].ToString() != null)
                    {
                        result[j] = searchresult.Properties[properties[j]][0].ToString();
                    } 
            }

I tried to write it with foreach, first for sucessful, but now i don´t know how to fill the String[] result:

C#

foreach (String s in properties)
            {
                searcher.PropertiesToLoad.Add(s);
            }

foreach (String s in properties)
            {
                if (searchresult.Properties.Contains(s))
                {
                    if (searchresult.Properties[s][0].ToString() != null)
                    {
                        result[????]= searchresult.Properties[s][0].ToString();
                    }
                }
            }

Can anyone help me please?

Posted 27-Sep-11 22:20pm

kuti, ger

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2 solutions

Solution 2

Just use a simple counter variable that is incremented every single time the foreach loop runs.

Posted 27-Sep-11 22:33pm

Abhinav S

Updated 27-Sep-11 22:36pm

v2

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OriginalGriff · Accepted Answer · 2011-09-27T22:26:00

If you want to use a foreach (and it makes some sense) and assuming there is enough space in the result array, then you just have to set up an integer of your own:

C#

int j = 0;
foreach (String s in properties)
            {
                if (searchresult.Properties.Contains(s))
                {
                    if (searchresult.Properties[s][0].ToString() != null)
                    {
                        result[j++]= searchresult.Properties[s][0].ToString();
                    }
                }
            }

Alternatively, I would set up result as a List of strings, and add to it each time:

C#

foreach (String s in properties)
            {
                if (searchresult.Properties.Contains(s))
                {
                    if (searchresult.Properties[s][0].ToString() != null)
                    {
                        result.Add( searchresult.Properties[s][0].ToString());
                    }
                }
            }

If you need an array afterwards, then List has a ToArray method. This way, you are not assigning space you don't need, or leaving null entries at the end of the array, or running out of array because you didn't assign enough elements.