convert '2005' to '05'

[reagan123]

i'm using the following piece of code

int currentYear = DateTime.Now.Year;

 

right now it gives me '2005'... how can get it to be '05'

 

this is an asp.net/c# web project

 

thanks

[Joe Mamma]

i'm using the following piece of code

int currentYear = DateTime.Now.Year;

 

right now it gives me '2005'... how can get it to be '05'

 

thanks

well. . . '05' is a string. . . do you want the integer 5 or the string '05'

 

to get the the string '05'

 

string currentYear = DateTime.Now.ToString('yy');

from there you can figure out how to get integer 5.

[reagan123]

thanks..

basically all i'm wanting is to populate a dropdown box with the following values

 

05 06 07 08 09 10

 

 

Here is the definition from the api i'm using

 

cardexpyear -- integer from 00 to 99 -- The two-digit expiration year of the credit card

[Joe Mamma]

dont mix format with value. . .

 

Do something like the following:

 

 public class YearValue
{
 int _value;
 int _min;
 int _max;
 public string Display
 {
  get
  {
   return _value.ToString().PadLeft(4,'0').Substring(2,2);
  }
 }
 public int Value
 {
  get
  { 
   return _value;     
  }
  set
  {
   if ((value >= _min) && (value <= _max)) 
     _value = value;
   else
    throw new ArgumentException("Value out of range");
  }
 }
 public YearValue()
 {
  _min = 2000;
  _max = 2010;
  _value = 2000;
 }
 public YearValue(int min, int max)
 {
  _min = min;
  _max = max;
  _value = min;
 }
 public YearValue(int min, int max, int value)
 {
  _min = min;
  _max = max;
  Value = value;
 }
}

usage

 System.Collections.ArrayList al = new ArrayList();
al.Add(new YearValue(2005, 2010, 2005));
al.Add(new YearValue(2005, 2010, 2006));
al.Add(new YearValue(2005, 2010, 2007));
al.Add(new YearValue(2005, 2010, 2008));
al.Add(new YearValue(2005, 2010, 2009));
al.Add(new YearValue(2005, 2010, 2010));
comboBox1.DataSource = al;
comboBox1.DisplayMember = "Display";
comboBox1.ValueMember = "Value";

[reagan123]

thanks!

that looks like a perfect solution... i'll try and implement it later today!

[Joe Mamma]

there are many ways to filet this feline. . .

and maybe this is simpler. . . though the value of the combobox will be a DateValue object where the first one the value was an int. . .

 

public class YearValue
{
 int _value;
 public override string ToString()
 {
  string s = _value.ToString().PadLeft(4,'0');
  return s.Substring(s.Length-2,2);
 }
 public YearValue(int value)
 {
  _value = value;
 }
 public int Value
 {
  get
  {
   return _value; 
  }
  set
  {
   _value = value;
  }
 }
}

 

and to load:

comboBox1.DataSource = new ArrayList(
new object[] 
 { 
  new YearValue(2005),
  new YearValue(2006),
  new YearValue(2007),
  new YearValue(2008),
  new YearValue(2009),
  new YearValue(2010)
 }
);

 

set the DropDownStyle of the combo to DropDownList. And to get the actual year value:

MessageBox.Show((comboBox1.SelectedValue as YearValue).Value.ToString());

 

do you need to allow a null selection in the combo???

comboBox1.DataSource = new ArrayList(
new object[] 
 { 
  string.Empty;
  new YearValue(2005),
  new YearValue(2006),
  new YearValue(2007),
  new YearValue(2008),
  new YearValue(2009),
  new YearValue(2010)
 }
);

then you can add a property to your form:

protected YearValue SelectedYear
{
 get
 {
//returns null if empty string is selected. . . 
   return comboBox1.SelectedValue as YearValue;
 }
}

then to get the value:

if (this.SelectedYear == null)
 MessageBox.Show("Please Select a Year")
else
 MessageBox.Show(this.SelectedYear.Value.ToString());

 

Again. . .the concept here is that the control only manages the GUI events and presentation, That is, it presents the selected object from the bound collection to the GUI. It has a reference to the collection of objects but it dose not explicitly contain the objects.

 

I hope this sparks some ideas.

[Joe Mamma]

if (this.SelectedYear == null)
 MessageBox.Show("Please Select a Year")
else
 MessageBox.Show(this.SelectedYear.Value.ToString());

or -

 

if (this.SelectedYear == null)
 MessageBox.Show("Please Select a Year")
else
 MessageBox.Show(string.format("{0} = {1}", 
     this.SelectedYear.ToString(),
     this.SelectedYear.Value.ToString()));

[Joe Mamma]

now. . . all that being said -

 

Do you need more than one of these selected year combo's in your app???

 

It may be worth your while to inherit from ComboBox and publish out a max, min, AllowNull and SelectedYear properties. Implement ISupoportInitialize and Create and Populate the bound collection in it's EndInit method (only if not designmode!!!) -

public class YearCombo : System.Windows.Forms.ComboBox, ISupportInitialize
{
 int _min;
 int _max;
 bool _allowNull;
 /// <summary>
 /// Required designer variable.
 /// </summary>
 private System.ComponentModel.Container components = null;
 public YearCombo(System.ComponentModel.IContainer container)
 {
  ///
  /// Required for Windows.Forms Class Composition Designer support
  ///
  container.Add(this);
  InitializeComponent();
  //
  // TODO: Add any constructor code after InitializeComponent call
  //
 }
 public YearCombo()
 {
  ///
  /// Required for Windows.Forms Class Composition Designer support
  ///
  InitializeComponent();
  //
  // TODO: Add any constructor code after InitializeComponent call
  //
 }
 /// <summary> 
 /// Clean up any resources being used.
 /// </summary>
 protected override void Dispose( bool disposing )
 {
  if( disposing )
  {
   if(components != null)
   {
    components.Dispose();
   }
  }
  base.Dispose( disposing );
 }

 #region Component Designer generated code
 /// <summary>
 /// Required method for Designer support - do not modify
 /// the contents of this method with the code editor.
 /// </summary>
 private void InitializeComponent()
 {
  components = new System.ComponentModel.Container();
 }
 #endregion
 #region ISupportInitialize Members
 public void BeginInit()
 {
  // TODO:  Add YearCombo.BeginInit implementation
 }
 public void EndInit()
 {
  if (DesignMode) return;
  ArrayList al = new ArrayList();
  if (_allowNull) 
   al.Add(string.Empty);
  for (int i = _min; i <= _max; i++)
   al.Add(new YearValue(i));
  this.DataSource = al;
 }
 #endregion
 public int MinYear
 {
  get
  {
   return _min;
  }
  set
  {
   if (_max < value) throw new ArgumentException(
         string.Format("Minimum Year must be less than or equal to {0}", _max.ToString())); 
   _min = value;
   this.EndInit();
  }
 }
 public int MaxYear
 {
  get
  {
   return _max;
  }
  set
  {
   if (_min > value) throw new ArgumentException(
          string.Format("Maximum Year must be greater than or equal to {0}", _min.ToString())); 
   _max = value;
   this.EndInit();
  }
 }
 public bool AllowNull
 {
  get
  {
   return _allowNull;
  }
  set
  {
   if (_allowNull = value) return;
   _allowNull = value;
   EndInit();
  }
 }
 public YearValue SelectedYear
 {
  get
  {
   //returns null if empty string is selected. . . 
   return this.SelectedValue as YearValue;
  }
 }
}
public class YearValue
{
 int _value;
 public override string ToString()
 {
  string s = _value.ToString().PadLeft(4,'0');
  return s.Substring(s.Length-2,2);
 }
 public YearValue(int value)
 {
  _value = value;
 }
 public int Value
 {
  get
  {
   return _value; 
  }
  set
  {
   _value = value;
  }
 }
}

[Joe Mamma]

oops. . .just saw that this is ASP.NET!!!

 

the same ideas should apply!