Develop Reference

Why can't I create an array of an object I created?

The objective is to create a spreadsheet kind of program such as Microsoft Excel. I have created a cell class which I want to create multiple instances of. Is the syntax incorrect or am I missing something logically?
What I did so far:
- Create a cell class.
- Initialized array, only to get an error.
public partial class form_welcomeScreen : Form
{
Label[] cellLetters = new Label[26];
Label[] cellNumbers = new Label[26];
Cell cell[] = new Cell[26];
char cellLetter = 'A';
int cellNumber = 1;
public form_welcomeScreen()
{
InitializeComponent();
}
private void Btn_newSheet_Click(object sender, EventArgs e)
{
for (int i = 0; i < 26; i++)
{
Cell cell = new Cell();
pnl_main.Controls.Add(cell.createCell());
cell.CellLetter = cellLetter;
cell.CellNumber = cellNumber;
cellLetter++;
cellNumber++;
}
}
}
class Cell : System.Windows.Forms.TextBox
{
private char cellLetter;
private int cellNumber;
private string cellID;
public char CellLetter
{
get { return cellLetter; }
set { cellLetter = value; }
}
public int CellNumber
{
get { return cellNumber; }
set { cellNumber = value; }
}
public string CellID
{
get { return cellID; }
set { cellID = CellLetter + Convert.ToString(CellNumber); }
}
public TextBox createCell()
{
TextBox cell = new TextBox();
cell.AcceptsReturn = true;
cell.Name = cellID;
cell.Size = new System.Drawing.Size(50, 25);
return cell;
}
I expect an array to be created so I can be able to create a whole spreadsheet of cells rather than just the one.

The line:
Cell cell[] = new Cell[26];
gives you mismatched types (cell vs cell[]). It should be:
Cell[] cell = new Cell[26];

How can I get the usercontrol to pass the values from the form it is initiated in to another one?

I am creating this simple video game ordering application. I have create an userControl named productControl. Code:
public partial class productControl : UserControl
{
private string pName;
private float pPrice;
private string pDesc;
private string pImgUrl;
public productControl() => InitializeComponent();
public string getName
{
get => pName;
set
{
pName = value;
productName.Text = pName;
}
}
public float getPrice
{
get => pPrice;
set
{
pPrice = value;
productPrice.Text = pPrice.ToString("c");
}
}
public string getDescription
{
get => pDesc;
set
{
pDesc = value;
descriptionText.Text = pDesc;
}
}
public string getImage
{
get => pImgUrl;
set
{
pImgUrl = value;
prodImage.Load(pImgUrl);
prodImage.SizeMode = PictureBoxSizeMode.StretchImage;
}
}
public int getProdId { get; set; }
private void buyButton_Click(object sender, EventArgs e)
{
MessageBox.Show(pPrice.ToString("c"));
orderConfirmation o = new orderConfirmation();
o.Show();
}
}
And a Windows Forms named accountMain. Which retrieves data from SQL and calls the productControl to fill it up.
private string productRetriever = "SELECT prodId, prodName, prodPrice, prodImg, prodDesc FROM [dbo].[products]";
private void accountMain_Load(object sender, EventArgs e)
{
createFunctions();
}
private void createFunctions()
{
connection.Open();
SqlCommand retProduct = new SqlCommand(productRetriever, connection);
panel1.Controls.Clear()
using (var reader = retProduct.ExecuteReader())
{
int count = 0;
while(reader.Read())
{
p[count] = new productControl();
p[count].Name = count.ToString();
p[count].getProdId = (int)reader[0];
p[count].getName = (string)reader[1];
p[count].getPrice = (float)reader[2];
p[count].getImage = (string)reader[3];
p[count].getDescription = (string)reader[4];
panel1.Controls.Add(p[count]);
count++;
}
}
connection.Close();
}
Above I am using a while loop to populate the panel1 with productControl inside of the accountMain Form. How can I get userControl to hide the accountForm and show another form (passing the values into the new form like title and price) when I click the "Buy" button which is inside the userControl.
Also I am new to implementing SQL into C# is it the correct way to populate the panel1 in accountMain using executeReader() or is there a better approach of retrieving data from SQL and showing it in userControl?

How to get selected values from a table row in a table layout in xamarin android

I am a beginner in xamarin android,I want to get the data in a particular row in the table layout.
Please help me..
Here is my Adapter code
public class CaseDetailsAdapter : BaseAdapter<CaseDetails>
{
private readonly Activity context;
private readonly List<CaseDetails> _cases;
int _count;
public TableRow _row;
public static TableLayout _tbLayout;
public TextView _value;
public TableLayout _temp;
public CaseDetailsAdapter(Activity context, List<CaseDetails> model)
{
this.context = context;
this._cases = model;
}
public List<CaseDetails> GetList()
{
return _cases;
}
public override long GetItemId(int position)
{
return position;
}
public override int Count
{
get { return _cases.Count; }
}
public override CaseDetails this[int position]
{
get { return _cases[position]; }
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
var view = convertView;
if (string.IsNullOrEmpty(_cases[position].Description) && string.IsNullOrEmpty(_cases[position].Title) && _cases[position].Files != null)
{
_count = (_cases[position].Files).Count;
view = context.LayoutInflater.Inflate(Resource.Layout.DetailsTable, null);
_temp = (TableLayout)view.FindViewById(Resource.Id.tablelayout_file);
_row = new TableRow(context);
_row.SetPadding(10, 0, 10, 0);
_row.LayoutParameters = new TableLayout.LayoutParams(TableLayout.LayoutParams.WrapContent, TableLayout.LayoutParams.FillParent);
for (int i = 1; i <= _count; i++)
{
_row = new TableRow(context);
_row.SetPadding(10, 0, 10, 0);
_row.LayoutParameters = new TableLayout.LayoutParams(TableLayout.LayoutParams.WrapContent, TableLayout.LayoutParams.FillParent);
TextView _title = new TextView(context);
string _tempTitle = (_cases[position].Files.ElementAt(i).Title);
_title.Text = _tempTitle + "\n";
_title.SetBackgroundResource(Resource.Drawable.border);
_title.Id = i ;
_row.AddView(_title);
_value = new TextView(context);
string _tempValue = (_cases[position].Files.ElementAt(i).Value);
if (_tempValue.Length > 35)
{
_value.Text = System.Text.RegularExpressions.Regex.Replace(_tempValue, ".{35}", "$0\n");
}
else
{
int _length = _tempValue.Length;
for (int j = _length; j < 35; j++)
{
_valueImgName = _tempValue + " ";
}
_value.Text = _valueImgName + "\n";
}
_value.SetBackgroundResource(Resource.Drawable.border);
_row.AddView(_value);
_temp.AddView(_row);
_row.Click += _row_Click;
}
}
else
{
view = context.LayoutInflater.Inflate(Resource.Layout.CaseDetailsDesign, null);
//else case code...
}
return view;
} private void _row_Click(object sender, EventArgs e)
{
//not working
}
}
When I clicking row in the table layout,I want to get the contents in that row (_value.text). And the DetailsTable is located in a single row of a list view.How could I get the data.I think here didn't assign a id to the textview or table row may be that's the reason can't get the data.

You could try to use the GetChildAt() method in your click event.
For example:
private void _row_Click(object sender, EventArgs e)
{
TableRow tableRow = (TableRow)sender;
TextView title = (TextView)tableRow.GetChildAt(0);
TextView value = (TextView)tableRow.GetChildAt(1);
}

How to show the attributes of an object when clicking a button in Windows forms?

I want to show the attributes of an object when I click on a button in Windows Forms using c# and I don't know how to do it. Part of my code looks like this until now. I'm a beginner in c#.
class Pizza: ICloneable
{
private string nume;
private int nrIngrediente;
private string[] ingrediente;
public Pizza()
{
nume = "Margherita";
nrIngrediente = 2;
ingrediente = new string[nrIngrediente];
for (int i = 0; i < nrIngrediente; i++)
{
ingrediente[0] = "Sos rosii";
ingrediente[1] = "Mozzarella";
}
}
public Pizza(string den, int nri, string[] ing)
{
nume = den;
nrIngrediente = nri;
ingrediente = new string[nrIngrediente];
for (int i = 0; i < nrIngrediente; i++)
ingrediente[i] = ing[i];
}
public Pizza(Pizza p)
{
nume = p.nume;
nrIngrediente = p.nrIngrediente;
ingrediente = new string[nrIngrediente];
for (int i = 0; i < nrIngrediente; i++)
ingrediente[i] = p.ingrediente[i];
}
public string PizzaName
{
get { return nume; }
set { nume = value; }
}
public int PizzaNrIng
{
get { return nrIngrediente; }
set { nrIngrediente = value; }
//also, i don't know how to write the getter and setter for this one
public string PizzaIngredients
//{
// get
// {
// for(int i=0;i<nrIngrediente;i++)
// return ingrediente[i];
// }
// set { ingrediente = value; }
//}
And now, the form code is the following(note that i designed it already):
public partial class ListaPizza : Form
{
public ListaPizza()
{
InitializeComponent();
}
private void Margherita_Click(object sender, EventArgs e)
{
string[] ingrMargh = new string[2] { "Sos rosii", "Mozzarella" };
Pizza Margherita = new Pizza("Margherita", 2, ingrMargh);
//Show(Margherita);
//here i want the object created above to be shown in a messagebox when i click the button in the form but i don't know how
}
}
Thank you!

MessageBox.Show();
has to be a string value so any parts of your object that is not a string will need the .ToString() method
Or if you want to customize the view you could pass the object to a new form and create a whole nice layout for it with the designer.

You can set the getter and setter in below way.
public string PizzaIngredients
{
get
{
return String.Join(",",nringrediente);
}
set
{
nringrediente = value.Split(',');
}
}
And Show(Margherita); can be implemented like in Pizza Class :
public string GetDisplayMessageForPizza()
{
return "My Pizza is " + nume + ". It contains " + nringrediente + " ingredients : " + PizzaIngredients;
}
And in form ListaPizza :
private void Margherita_Click(object sender, EventArgs e)
{
string[] ingrMargh = new string[2] { "Sos rosii", "Mozzarella" };
Pizza Margherita = new Pizza("Margherita", 2, ingrMargh);
MessageBox.Show(Margherita.GetDisplayMessageForPizza());
}

As for the getter - you should return an array of strings, not just a string:
public string[] PizzaIngredients
{
get
{
ingrediente;
}
set
{
ingrediente = value;
}
}
As for the showing - just use MessageBox.Show():
MessageBox.Show(string.Format("{0} {1}", Margherita.Name, Margherita.nrIngrediente));

Access list in class from another class

I know this is asked before, but I can't seem to figure it out.
I have a class which makes a list from a datagridview. I want to do stuff with this list in another class but I cant't access it. I can access it from Form1.cs like the code underneath. How do I access the list from a random class like I can in Form1.cs?
//Opens the file dialog and assigns file path to Textbox
OpenFileDialog browseButton = new OpenFileDialog();
private void browse_Click(object sender, EventArgs e)
{
browseButton.Filter = "Excel Files |*.xlsx;*.xls;*.xlsm;*.csv";
if (browseButton.ShowDialog() == DialogResult.OK)
{
ExcelPath.Text = browseButton.FileName;
fileExcel = ExcelPath.Text;
//SetAttributeValue(ExcelPath, fileExcel);
//nylp();
/*
////IMPORTERER 10TAB-DATA FRA EXCEL TIL DATAGRIDVIEW////
tenTabLine.fileExcel = fileExcel;
tenTabLine.tenTab(tenTabDgv);
*/
////IMPORTERER NYLPDATA TIL DATAGRIDVIEW////
nylpLine.fileExcel = fileExcel;
nylpLine.nylpData(nylpDgv);
////TAR DATA I NYLPDGV DATAGRIDVIEW OG BEREGNER VERTIKALE ELEMENTER////
vertElementer.vertBueDGV(nylpDgv, vertElementerDgv);
GetVertElementasList getList = new GetVertElementasList();
var TEST = getList.vertList(vertElementerDgv);
MessageBox.Show(TEST[5].p2.ToString());
}
else return;
}
When I try to do something like this I get lot of errors in Error List:
class GetKoord
{
GetVertElementasList getList = new GetVertElementasList();
var TEST = getList.vertList(vertElementerDgv);
MessageBox.Show(TEST[5].p2.ToString());
}
This is my list class
class GetVertElementasList
{
private List<vertEl> vertElementList = new List<vertEl>();
public List<vertEl> vertList(DataGridView VertElementer)
{
for (int i = 0; i<VertElementer.Rows.Count - 1; i++)
{
vertElementList.Add(new vertEl
{
elNr = (int)VertElementer.Rows[i].Cells[0].Value,
p1 = (double)VertElementer.Rows[i].Cells[1].Value,
p2 = (double)VertElementer.Rows[i].Cells[2].Value,
z1 = (double)VertElementer.Rows[i].Cells[3].Value,
z2 = (double)VertElementer.Rows[i].Cells[4].Value,
heln1 = Convert.ToDouble(VertElementer.Rows[i].Cells[5].Value),
heln2 = (double)VertElementer.Rows[i].Cells[6].Value
});
}
return vertElementList;
}
}
public class vertEl
{
private int _elNr;
private double _p1;
private double _p2;
private double _z1;
private double _z2;
private double _nylpRad;
private double _heln1;
private double _heln2;
public int elNr
{
get { return _elNr; }
set { _elNr = value; }
}
public double p1
{
get { return _p1; }
set { _p1 = value; }
}
public double p2
{
get { return _p2; }
set { _p2 = value; }
}
public double z1
{
get { return _z1; }
set { _z1 = value; }
}
public double z2
{
get { return _z2; }
set { _z2 = value; }
}
public double nylpRad
{
get { return _nylpRad; }
set { _nylpRad = value; }
}
public double heln1
{
get { return _heln1; }
set { _heln1 = value; }
}
public double heln2
{
get { return _heln2; }
set { _heln2 = value; }
}
}
EDIT:
I've made it work now except that I get a out of range exception.
class code is:
class GetKoord
{
public GetVertElementasList getList = new GetVertElementasList();
BridgGeometry obj = new BridgGeometry();
public void foo()
{
var TEST = getList.vertList(obj.vertElementerDgv);
MessageBox.Show(TEST[2].elNr.ToString());
}
}
In form1 or BridgGeometry as it is called in my project I have which is giving me out of range exception.
GetKoord getZ = new GetKoord();
getZ.foo();
EDIT2:
The code underneath works and gives a message box with some value in list. But the method foo() in class above gives a out of range error.
private void browse_Click(object sender, EventArgs e)
{
browseButton.Filter = "Excel Files |*.xlsx;*.xls;*.xlsm;*.csv";
if (browseButton.ShowDialog() == DialogResult.OK)
{
////TESTING////WORKING CODE AND GIVES A MESSAGEBOX WITH VALUE
GetVertElementasList getVertList = new GetVertElementasList();
var TEST = getVertList.vertList(vertElementerDgv);
MessageBox.Show(TEST[2].elNr.ToString());
}
else return;
}

I think you are trying to access the variable directly in the class; which will not work. Try following
class GetKoord
{
GetVertElementasList getList = new GetVertElementasList();
public void foo()
{
var TEST = getList.vertList(vertElementerDgv);
MessageBox.Show(TEST[5].p2.ToString());
}
}

I tested your code and it seemed to worked. My code for you and #Anand
No Errors, except for empty Lists. But thats because I didn't fed it any information. So, there shouldn't be a problem.
#Grohl maybe try my code and comment where the error is displayed. This should be the most easy way to find the problem.
TestClass which represents class GetKoord
namespace TestForm
{
class TestClass
{
public TestClass()
{
DataGridView tmp = new DataGridView();
GetVertElementasList getList = new GetVertElementasList();
var TEST = getList.vertList(tmp);
MessageBox.Show(TEST[5].p2.ToString());
}
}
}
The GetVertElementasList
namespace TestForm
{
class GetVertElementasList
{
private List<vertEl> vertElementList = new List<vertEl>();
public List<vertEl> vertList(DataGridView VertElementer)
{
for (int i = 0; i < VertElementer.Rows.Count - 1; i++)
{
vertElementList.Add(new vertEl
{
elNr = (int)VertElementer.Rows[i].Cells[0].Value,
p1 = (double)VertElementer.Rows[i].Cells[1].Value,
p2 = (double)VertElementer.Rows[i].Cells[2].Value,
z1 = (double)VertElementer.Rows[i].Cells[3].Value,
z2 = (double)VertElementer.Rows[i].Cells[4].Value,
heln1 = Convert.ToDouble(VertElementer.Rows[i].Cells[5].Value),
heln2 = (double)VertElementer.Rows[i].Cells[6].Value
});
}
return vertElementList;
}
}
//Some other stuff
}
Last but not least. the code from the button click event:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void simpleButton1_Click(object sender, EventArgs e)
{
DataGridView tmp = new DataGridView();
GetVertElementasList getList = new GetVertElementasList();
var TEST = getList.vertList(tmp);
MessageBox.Show(TEST[5].p2.ToString());
TestClass tmpClass = new TestClass();
}
}
To #Grohl EDIT2:
It hurts to see that you are trying to read data without checking if there is any. In such cases, check!
Like this:
if(TEST.Count() >= 3)
{
MessageBox.Show(TEST[2].elNr.ToString());
}
It should debug at be smooth at runtime. I think your problem is getting the data.
Make sure you load the needed data and check if it isn't null.