WPF - Redrawing the whole control on resize - Coded in C# [C-Sharp]VB, C++ (Open Source)

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Redrawing The Whole Control On Resize[C#]

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Coded: C#  Text Editor: Visual Studios 2013  Project: Windows Forms - WPF Application
Tutorial # 6 How To Redraw The Whole Control on Resize.
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When custom controls or Windows Forms controls like Panel are resized, only their newly exposed portions are redrawn. However, this behaviour sometimes does not provide the desired results (see fig. 1 below).

This example shows how to ensure redrawing of the whole control after resizing by setting the control's ResizeRedraw property.

Fig. 1. A partially redrawn control after resizing.

Redrawing the whole control on resize

The ResizeRedraw protected property defined in the Control class indicates, whether the control redraws itself when resized. To ensure redrawing of the whole control on resize set this property to true. This will usually be done in the constructor of a derived class.

[C#]

public MyControl()
{
InitializeComponent();
ResizeRedraw = true;
}

Alternatively, if you can not or don't want to create a derived class, set the property using reflection or simply call the Invalidate or Refresh method in the control's Resize event handler.

[C#]

using System.Reflection;

public static void SetResizeRedraw(Control control)
{
typeof(Control).InvokeMember("ResizeRedraw",
BindingFlags.SetProperty | BindingFlags.Instance | BindingFlags.NonPublic,
null, control, new object[] { true });
}

[C#]

myControl.Resize += new EventHandler(myControl_Resize);

private void myControl_Resize(object sender, EventArgs e)
{
((Control)sender).Invalidate();
}

A sample control

The following is a code of a user control displaying an ellipse that stretches and shrinks when the control's size changes:

[C#]

public partial class MyControl : UserControl
{
public MyControl()
{
InitializeComponent();
ResizeRedraw = true;
}

protected override void OnPaintBackground(PaintEventArgs e)
{
base.OnPaintBackground(e);
// draw a blue ellipse into the control area
e.Graphics.FillEllipse(new SolidBrush(Color.Blue), 2, 2,
ClientRectangle.Width - 4, ClientRectangle.Height - 4);
}
}

Whithout the ResizeRedraw statement, the control is redrawn only partially and the result looks like in figure 1 above. When the ResizeRedraw = true statement is included, the control is redrawn properly as shown in the following figure 2.

Fig. 2. A properly redrawn control after resizing.

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C# Code Behindusing System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnSend_Click(object sender, EventArgs e)
{
MailMessage mail = new MailMessage();
mail.To.Add(txtTo.Text);
//mail.To.Add("amit_jain_online@yahoo.com");
mail.From = new MailAddress(txtFrom.Text);
mail.Subject = txtSubject.Text;
mail.Body = txtMessage.Text;
mail.IsBodyHtml = true;

//Attach file using FileUpload Control and put the file in memory stream
if (FileUpload1.HasFile)
{
mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
}
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential
("YourGmailID@gmail.com", "YourGmailPassword");
//Or your Smtp Email ID and Password
smtp.EnableSsl = true;
smtp.Send(mail);

}
}VB.NET Code Behind

Imports System
Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Imports System.Net.Mail

Public Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

End Sub
Protected Sub btnSend_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim mail As New MailMessage()
mail.[To].Add(txtTo.Text)
'mail.To.Add("amit_jain_online@yahoo.com");
mail.From = New MailAddress(txtFrom.Text)
mail.Subject = txtSubject.Text
mail.Body = txtMessage.Text
mail.IsBodyHtml = True

'Attach file using FileUpload Control and put the file in memory stream
If FileUpload1.HasFile Then
mail.Attachments.Add(New Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName))
End If
Dim smtp As New SmtpClient()
smtp.Host = "smtp.gmail.com"
'Or Your SMTP Server Address
smtp.Credentials = New System.Net.NetworkCredential("YourGmailID@gmail.com", "YourGmailPassword")
'Or your Smtp Email ID and Password
smtp.EnableSsl = True

smtp.Send(mail)
End Sub
End Class
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