index > Windows Forms General > tablelayoutpanel, combobox, array

tablelayoutpanel, combobox, array

Hi,

I am generating multiple comboboxes in tablelayoutpanel at runtime. I am taking datasource of combobox from one dimensional array and hence, all the comboboxes are changing when i change just one. So, the solution is to take two dimensional matrix where a given row number is combobox number and column values are the datasource for that combobox, but I do not know the syntax for this....please help.

existing code:

this.tableLayoutPanel1.ColumnCount=2;

for (int j = 0; j < this.tableLayoutPanel1.ColumnCount; j++)

{

for (int i = 0; i < this.tableLayoutPanel1.RowCount; i++)

{

if (j < 1)

{

Label lb = new Label();

lb.Text = string.Format(textFormat, i);

this.tableLayoutPanel1.Controls.Add(lb, j, i);

lb.AutoSize = true;

}

else

{

ComboBox cb = new ComboBox();

cb.Name = string.Format(nameFormat, i,j);

this.tableLayoutPanel1.Controls.Add(cb, j, i);

cb.AutoSize = true;

//one dimensional array is taken as datasource below

cb.DataSource = matN;

}

If i define a new array as int [,] matNnew;

how do I write the following

cb.DataSource = matNN[i,];

//i cant leave a blank in above........what should be the syntax here......?

Note that the contents for each combobox are the same.....

Thank you.

gulti Monday, July 14, 2008 6:10 AM

This is roughly what I meant...

Code Snippet

public Form1()
{
InitializeComponent();

this.tableLayoutPanel1.ColumnCount = 2;
this.tableLayoutPanel1.RowCount = 5;
string nameFormat = "cmb_{0}_{1}";
string textFormat = "text_{0}";

Dictionary<string, string[]> dic = new Dictionary<string, string[]>();
// create all dataSources
for (int i = 0; i < this.tableLayoutPanel1.RowCount; i++)
{
for (int j = 0; j < this.tableLayoutPanel1.ColumnCount; j++)
{
if (j == 0)
{
Label lbl = new Label();
lbl.Name = "label_" + i.ToString();
lbl.Text = string.Format(textFormat, i);
this.tableLayoutPanel1.Controls.Add(lbl, j, i);
}
else
{
string[] arr = CreateDataSource(i,j);
string name = string.Format(nameFormat, i, j);
dic.Add(name, arr);
ComboBox cmb = new ComboBox();
cmb.Name = name;
cmb.DataSource = dic[name];
this.tableLayoutPanel1.Controls.Add(cmb, j, i);
}
}
}

}

private string[] CreateDataSource(int row, int col)
{
return new string[] { "asdasd", "dgfsdfs", "cbcvbcvbc" };
}

note that the method CreateDataSource creates the DataSource for the specific combo...

hth,
Lior.

Lior Salem Tuesday, July 15, 2008 8:06 AM

Instead of useing a two dimentional array, you can use a List of single dimention array.

Code Snippet

List<string[]> lst = new List<string[]>();

and get the values as lst Idea

.

Alternatively, you can use a Dictionary<string, string[]> where the key would be the name of the comboBox and you will be able to do this:

Code Snippet

Dictionary<string, string[]> dic = new Dictionary<string, string[]>();
...
cb.DataSource = dic[cb.Name];

hth,
Lior.

Lior Salem Monday, July 14, 2008 12:33 PM

Thank you very much!

I tried getting checkboxes for each question (my last question which you helped), but the system takes a lot of time to generate a formif number of questions/checkboxes is large (also is is not very visually nice when the size is huge)............So, i decided to do it by comboboxes.....

I am learning ......

Thanks again!

gulti Tuesday, July 15, 2008 1:41 AM

I tried this, why doesnt thiswork (same problem, if i change one combobox, all will change)....Thanks!

string[] arrN = new string[numN];

string[] arrP = new string[numP];

for (int i = 1; i < numN+1; i++)

{

arrN[i-1] = Convert.ToString(i);

}

Dictionary<string, string[]> dic = new Dictionary<string, string[]>();

for (int i = 1; i < numP + 1; i++)