How can I output the first n elements of a dictionary (in separate labels)?

Question

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So far here's what I have:

C#

string[] modes = {"AA", "BB", "CC"};
Label[] aName = new Label[5];

aName[0] = lblName1;
//Store label from form
//So on & so forth


            for (int y = 0; y < modes.Length; y++)
            {
                switch (modes[y])
                {
                    case "AA":
                        foreach (KeyValuePair<string, int> pair in dictionaryA)
                        //tried foreach (KeyValuePair<string, int> pair in dictionaryA).Take(5)), but it did not work?

                        {
                            u++;

                            if (u == 5)
                            {
                                return;
                            }
                                aName[u].Text = pair.Key.ToString().ToUpper();

                        }
                        break;
                     .
                     .
                     .
                     .
                }
            }

I need to get only the first 5 items of the Dictionary and output each item to separate labels. The code structure looks ridiculous but these are only my assumptions based on the basic knowledge I have of C#. :D :)

Posted 1-Oct-14 23:19pm

kmllev

Updated 2-Oct-14 2:47am

v4

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4 solutions

Solution 1

I would use a for loop, e.g.

C#

Dictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("a", 1);
dict.Add("b", 2);
dict.Add("c", 3);

for (int index = 0; index < 5 && index < dict.Count; index++)
{
  Console.WriteLine(dict.ElementAt(index).Key.ToUpper());
}

Posted 1-Oct-14 23:33pm

CPallini

Solution 4

I don't see anything wrong with your code example ... but ... I can't see where the variable 'u is initialized; I can only assume it's initial value is #0.

Here's an alternative example using Linq:

C#

private Dictionary<string, int> DictionaryA = new Dictionary<string, int>();

// for testing  only
List<Label> ALabelList = new List<Label>();

// for testing only
for (int i = 0; i < 10; i++)
{
   DictionaryA.Add(i.ToString(), i);
}

foreach (var kvp in DictionaryA.Take(5))
{
    ALabelList.Add(new Label {Text = kvp.Key.ToUpper()});
}

For reasons why one might avoid using the Linq ForEach, and All operators: see Eric Lippert's article: [^].

Posted 2-Oct-14 0:42am

BillWoodruff

Updated 2-Oct-14 1:01am

v2

Solution 3

This may helpful for you here am taking repeater in that am took label for that label am assigning key values

C#

private void BindDictionaruy()
        {

            Dictionary<string, int> dict = new Dictionary<string, int>();
            dict.Add("a", 1);
            dict.Add("b", 2);
            dict.Add("c", 3);
            dict.Add("3", 4);
            dict.Add("g", 5);

            var slist= dict.Take(5).Select(a => new { test =a.Key}).ToList();

            rptrBindDictionary.DataSource = slist;
            rptrBindDictionary.DataBind();

        }

XML

<asp:Repeater runat="server" ID="rptrBindDictionary">
          <ItemTemplate>
              <asp:Label Text='<%# Eval("test") %>' runat="server"  ID="lblBindDictionary"/>
          </ItemTemplate>
      </asp:Repeater>

Posted 2-Oct-14 0:05am

Samatha Reddy G

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Dilan Shaminda · Accepted Answer · 2014-10-01T23:49:00

I have modified your code with a console application to demonstrate and it works fine.Hope this helps to you :-)

C#

static Dictionary<string,> myDictionary = new Dictionary<string,>();

       static void Main(string[] args)
       {
           myDictionary.Add("1", 4);
           myDictionary.Add("2", 3);
           myDictionary.Add("3", 1);
           myDictionary.Add("4", 5);
           myDictionary.Add("5", 6);
           myDictionary.Add("6", 7);
           myDictionary.Add("7", 8);
           myDictionary.Add("8", 9);

           string[] modes = { "AA", "BB", "CC" };
           string[] arr = new string[5];
           int u = 0;

           for (int y = 0; y < modes.Length; y++)
           {
               switch (modes[y])
               {
                   case "AA":
                       foreach (KeyValuePair<string,> pair in myDictionary)
                       {


                           if (u < 5)
                           {
                               arr[u] = pair.Key.ToString().ToUpper();
                           }
                           else
                           {
                               continue;
                           }
                           u++;
                       }
                       break;
               }
           }

          foreach(string k in arr)
          {
              Console.WriteLine(k);
          }

          Console.ReadLine();
       }
   }