Adding Items to a string array

Question

I need a way to prepend items on to an existing string array, such that:

string[] dirParams = null;

if (Request.Params["locationDirection_0"] != "")
{
    dirParams = Request.Params["locationDirection_0"].Split(',');
}

if (Request.Params["locationDirection_1"] != "")
{
    dirParams = Request.Params["locationDirection_1"].Split(',');
}

if (Request.Params["locationDirection_2"] != "")
{
    dirParams = Request.Params["locationDirection_2"].Split(',');
}

if (Request.Params["locationDirection_3"] != "")
{
    dirParams = Request.Params["locationDirection_3"].Split(',');
}

will give me a string array of about 4 items (assuming none of the requests coming in are empty)

whats the easiest way to do this, I thought of using a list and or a dictonary, neither will work for what I want to do, string array is all I want.

Why not use a List, then convert to array?

Eugen Rieck
– Eugen Rieck

2013-05-25 19:33:56 +00:00
Commented May 25, 2013 at 19:33 — Eugen Rieck
– Eugen Rieck, Commented May 25, 2013 at 19:33
Do you mean prepend? Or do you really mean append?

Matthew Watson
– Matthew Watson

2013-05-25 20:06:59 +00:00
Commented May 25, 2013 at 20:06 — Matthew Watson
– Matthew Watson, Commented May 25, 2013 at 20:06

Thomas Levesque · Accepted Answer · 2013-05-25 19:34:48Z

2

Use a list instead:

        List<string> dirParams = new List<string>();

        if (Request.Params["locationDirection_0"] != "")
        {
            dirParams.AddRange(Request.Params["locationDirection_0"].Split(','));
        }

        if (Request.Params["locationDirection_1"] != "")
        {
            dirParams.AddRange(Request.Params["locationDirection_1"].Split(','));
        }

        if (Request.Params["locationDirection_2"] != "")
        {
            dirParams.AddRange(Request.Params["locationDirection_2"].Split(','));
        }

        if (Request.Params["locationDirection_3"] != "")
        {
            dirParams.AddRange(Request.Params["locationDirection_3"].Split(','));
        }

answered May 25, 2013 at 19:34

Thomas Levesque

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Comments

Ondrej Tucny · Accepted Answer · 2013-05-25 19:34:02Z

0

Use a List<string> and then the ToArray() method to convert it into a string[].

answered May 25, 2013 at 19:34

Ondrej Tucny

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Matt Houser · Accepted Answer · 2013-05-25 19:36:11Z

0

Build your items in a List<string> then use LINQ's .ToArray () to convert it into an array.

answered May 25, 2013 at 19:36

Matt Houser

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1 Comment

VisualMelon Over a year ago

Note that List.ToArray() isn't a component of LINQ.

I4V · Accepted Answer · 2013-05-25 20:10:01Z

0

How about using Linq?

var dirParam = Enumerable.Range(0, 4)
              .Select(i => Request.Params["locationDirection_" + i])
              .Where(s => !String.IsNullOrEmpty(s))
              .SelectMany(s => s.Split(','))
              .ToArray();

answered May 25, 2013 at 20:10

I4V

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