Adding Items to A List c#

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I have a "2 dimensional" list, and a button in which I add items to the list and try to get the items and add them to a listbox. This is the problem, when adding the items of the list to the listbox, I want to add different strings/texts depending on which List<string> it is, based on a certain condition. I've tried using LINQ. So For example:

C#

List<List<string>> getallwords;
Main mainlib; //class object

private void btnAddToList_Click(object sender, EventArgs e)
{
   listbox1.Items.Clear();
   if(textboxCount.Text == "3")
   {
      mainlib.AddtoList(tbox1.Text, tbox2.Text, tbox3.Text); //method from class that adds three words to list
      getallwords = mainlib.GetWordList() //method to get items in list
      var 3wordsquery = getallwords.Where(item => item.Count == 3)

      foreach(List<string> item in 3wordsquery)
      {
         listbox1.Items.Add("The houses are 3 in number");
      }
   }

   if(textboxCount.Text == "2")
   {
      mainlib.AddtoList(tbox1.Text, tbox2.Text); //method to add just two words to list
      getallwords = mainlib.GetWordList() //method to get items in list
      var 2wordsquery = getallwords.Where(item => item.Count == 2)
      foreach(List<string> item in 2wordsquery)
      {
         listbox1.Items.Add("The house are 2 in number");
      }
   }
}

But as the code shows, whenever the items are being added to the listbox, it returns either where item count is 2 or item count is 3. How can I make all items to be returned but still add different texts to the listbox?

Posted 6-Nov-15 4:02am

Member 11971544

Updated 6-Nov-15 4:33am

v4

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Comments

Maciej Los 6-Nov-15 10:18am

"I have a "2 dimensional" list: " List<List<string>> getallwords;
No, you don't! You have a list (of list (of strings)).

BillWoodruff 6-Nov-15 10:31am

No point in trying to help you with this if your code won't compile:

if(textboxCount.Text == 3) // going to throw an error here

Member 11971544 6-Nov-15 10:33am

updated

BillWoodruff 6-Nov-15 10:34am

please clarify what "depending on which List it is" means.

you can improve your question, imho, by showing the code for: mainlib.AddtoList, and mainlib.GetWordList

why is 'mainlib never instantiated: is it a static class ?

Krunal Rohit 6-Nov-15 11:37am

There's no 2 dimensional list.

-KR

2 solutions

Solution 2

I'm going to assume the key issue here is getting the TextBoxes that have text content passed to the 'mainlib.AddtoList method which I assume has an input parameter like this:

mainlib.AddtoList(params string[] args)

Assuming you have an Array of the TextBoxes used for input named 'TbxAry:

C#

private TextBoxEx[] TbxAry;

// in Form_Load or other code:
TbxAry = new TextBoxEx[]
{
    textBox1, textBox2, textBox3, textBox4 // and so on ...
};

// requires System.Linq
private void SomeButton_Click(object sender, EventArgs e)
{
    mainlib.AddtoList(TbxAry
        .Where(tbx => (!string.IsNullOrEmpty(tbx.Text)))
        .Select(tbx => tbx.Text).ToArray()
    );
}

I would eliminate a separate TextBox to hold a 'Count, and handle that some other way. You might consider using a Dictionary like this:

Dictionary<int, List<List<string>>> NToStrings;

which would be updated before you call mainlib.AddToList...

That way, you'd never have use Linq and pull out the Lists that have the same number of items. You'd just do this:

C#

List<List<string>> results;
    
if(NToStrings.TryParse(3, out results)) 
{
   // you have a list of all lists with 3 elements in 'results ... do whatever
{
else
{
   // no results ... do whatever
}

Posted 6-Nov-15 5:35am

BillWoodruff

Updated 6-Nov-15 6:04am

v3

Comments

Maciej Los 6-Nov-15 11:46am

Another good shot!

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Maciej Los · Accepted Answer · 2015-11-06T04:41:00

I guess you want to get the count of houses in for each list element. You're able to achieve that this way:

C#

List<List<string>> getallwords = new List<List<string>>(){
    new List<string>{"A", "B", "C", "D"},
    new List<string>{"E", "F", "G"},
    new List<string>{"H", "I"},
    new List<string>{"J"}};

var result = getallwords
    .GroupBy(item=>item.Count())
    .Select(grp=> new
    {
        Message = string.Format("The count of houses in a group: {0}", grp.Key)
    });

Result:

The count of houses in a group: 4
The count of houses in a group: 3
The count of houses in a group: 2
The count of houses in a group: 1