2008 Luglio 16>>MDSoft Weblog

Archive for Luglio 16th, 2008

ListView with alternating background colors and dep. props. used to set the colors

CodeKeep C# Feed Luglio 16th, 2008

Description: This is a child of the ListView class that has alternating background colors Dependency Properties are used to set the colors of the alternating background All instantiated classes are explicitly declared in their specific namespaces.

Link: http://www.codekeep.net/snippets/f7f17e5c-7ad3-4f04-a4a1-e6c6eff04db3.aspx

/// <summary>
/// Alternates the BG Color of each item in the listview
/// </summary>
public class AltBGRowsListView : System.Windows.Controls.ListView {
	protected override void PrepareContainerForItemOverride(System.Windows.DependencyObject element, object item) {
		base.PrepareContainerForItemOverride(element, item);
		if (View is System.Windows.Controls.GridView) {
			int index = ItemContainerGenerator.IndexFromContainer(element);
			System.Windows.Controls.ListViewItem lvi = element as System.Windows.Controls.ListViewItem;
			if (0 == index % 2)
				lvi.Background = this.GetValue(AltBGRowsListView.FirstRowProperty) as System.Windows.Media.SolidColorBrush;
			else
				lvi.Background = this.GetValue(AltBGRowsListView.SecondRowProperty) as System.Windows.Media.SolidColorBrush;
		}

	}

	public static readonly System.Windows.DependencyProperty FirstRowProperty = System.Windows.DependencyProperty.Register("FirstRow", typeof(System.Windows.Media.SolidColorBrush), typeof(AltBGRowsListView), new System.Windows.UIPropertyMetadata(null));

	/// <summary>
	/// Sets the color of the 1st of the alternating rows
	/// </summary>
	public System.Windows.Media.SolidColorBrush FirstRow {
		get {
			return (System.Windows.Media.SolidColorBrush)GetValue(FirstRowProperty);
		}
		set {
			SetValue(FirstRowProperty, value);
		}
	}

	public static readonly System.Windows.DependencyProperty SecondRowProperty = System.Windows.DependencyProperty.Register("SecondRow", typeof(System.Windows.Media.SolidColorBrush), typeof(AltBGRowsListView), new System.Windows.UIPropertyMetadata(null));

	/// <summary>
	/// Sets the 2nd color of the alternating rows
	/// </summary>
	public System.Windows.Media.SolidColorBrush SecondRow {
		get {
			return (System.Windows.Media.SolidColorBrush)GetValue(SecondRowProperty);
		}
		set {
			SetValue(SecondRowProperty, value);
		}
	}
}

Auto Dropdown

CodeKeep C# Feed Luglio 16th, 2008

Description: Makes a date time picker drop down when mouse hovers over it

Link: http://www.codekeep.net/snippets/3da21bc1-7cf2-4f69-9c4c-788d45a9b006.aspx

private void dtpFrom_MouseHover(object sender, EventArgs e)
        {
            dtpFrom.Focus();
            SendKeys.SendWait("%{DOWN}");
        }

WaitCursor

CodeKeep C# Feed Luglio 16th, 2008

Description: WaitCursor Class

Link: http://www.codekeep.net/snippets/67dbf1bc-8bb9-4255-98cb-6a4149582cee.aspx

public class WaitCursor : IDisposable
    {
        public WaitCursor()
        {
            Cursor.Current = Cursors.WaitCursor;
        }
        public void Dispose()
        {
            Cursor.Current = Cursors.Default;
        }
    }

DataBinder

CodeKeep C# Feed Luglio 16th, 2008

Description: GetPostBackEventHandler

Link: http://www.codekeep.net/snippets/25390c9f-dbc4-4337-bed9-723c9e003f39.aspx

 if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowType != DataControlRowType.EmptyDataRow)
        {
            bool isLockedOut= bool.Parse( DataBinder.Eval( e.Row.DataItem, "IsLockedOut").ToString());
            bool isOnline   = bool.Parse( DataBinder.Eval( e.Row.DataItem, "IsOnline").ToString());
            string userName = DataBinder.Eval( e.Row.DataItem, "UserName").ToString();
            
            e.Row.Attributes.Add("onMouseOver", "DoMarkOn(this);");
            e.Row.Attributes.Add("onMouseOut", "DoMarkOff(this);");

            TamperProof tp = new TamperProof();
            string url = string.Format("DetailUserView.aspx?username={0}", tp.QueryStringEncode( userName ));

            PostBackOptions postBackOptions = new PostBackOptions(MembersGridView, string.Empty, url, true, true, false, true, false, string.Empty); 
            e.Row.Attributes.Add("onclick",ClientScript.GetPostBackEventReference( postBackOptions ));

            Image IsLockedOutImage  = e.Row.FindControl("IsLockedOutImage") as Image;
            Image IsOnlineImage     = e.Row.FindControl("IsOnlineImage") as Image;
            
            IsLockedOutImage.ImageUrl = string.Format("~/App_Themes/Office2007/images/{0}", isLockedOut ? "user1_lock.png" : "lock_open.png" );
            IsLockedOutImage.AlternateText = isLockedOut ? Resources.Admin.Locked : Resources.Admin.UnLocked;

            IsOnlineImage.Visible = isOnline;
        }

Only One Instance per Application

CodeKeep C# Feed Luglio 16th, 2008

Description: Start-Routine for a Application where should only be start one Instance. The Programm use the Multiplexer in the System.Threading.Assembly

Link: http://www.codekeep.net/snippets/393c0960-573e-47a4-a2e3-463015cbe8fe.aspx

static void Main()
{
  bool bCreatedNew = false;

  // Multiplexer erzeugen der überprüft ob die Applikation gestartet wurde. Der out Parameter
  // wird nur beim ERSTEN erfolgreichen Start gesetzt.

  Mutex mtxApp = new System.Threading.Mutex(true, Application.ProductName, out bCreatedNew);
  // Wenn die Erzeugung erfolgreich war.
  if (bCreatedNew)
  {                     
    Application.Run(new FMAIN());
    // Mutex wieder freigeben
    mtxApp.ReleaseMutex();
  }
  else
  {
    string msg = String.Format("Das Programm \"{0}\" wurde bereits gestartet!", Application.ProductName);
    MessageBox.Show(msg, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Information);
  }
}

MD5 HashString

CodeKeep C# Feed Luglio 16th, 2008

Description: Die Funktion wandelt einen übergebenen String in einen codierten MD5 Hashstring um und gibt ihn zurück. Die Umwandlung ist unidirektional, d.h. der String kann nicht mehr rückgewandelt werden.

Link: http://www.codekeep.net/snippets/9c3de3fb-6ad5-4a15-8d97-f9df8c34aa63.aspx

    protected internal string MD5HashString(string sTextToHash)
    {
      MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
      byte[] byValue;
      byte[] byHash;

      // Neues CryptoServiceProvider Objekt erzeugen
      byValue = System.Text.Encoding.UTF8.GetBytes(sTextToHash);
      // Berechne den Hash und schreibe ein Array von Bytes zurück
      byHash = md5.ComputeHash(byValue);
      // Provider löschen
      md5.Clear();
      // Gibt einen Base 64 codierten String mit dem Hashwert zurück
      return Convert.ToBase64String(byHash);
    }