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J. Rodríguez
Asked: 2020-01-20 12:07:04 +0800 CST 2020-01-20 12:07:04 +0800 CST

Change Font to several Labels at the same Time, C#

  • 772

I want to change the font to the labels (Label1 to Label10) at the same time, explain:

I have a Form WindowsFormsin which I have a panelwithin that panel I have added 2 user controls UserControls, within both UserControlsI have several labels, which do not belong to them UserControlsbut are above the UserControlones added in them from the form.

enter image description here

This image to illustrate, The Panelis the Gris Oscurobackground, the UserControl contains 1 icon and a title that belongs to the user control including the part of the light gray background color. The only objects that do not belong to user controls are the internal labels that can be observed.

But when executing the function it also changes the font to the titles of UserControlswhich are also Labels but do not belong to the form as such, but come from the UserControl, I do it this way, with a recursive function :

private void cambiar_fuentes(Control contenedor)
{
    foreach (Control control in contenedor.Controls)
    {
        if (control.Controls.Count > 0)
           cambiar_fuentes(control);
        else
        {
           if (control is Label) ((Label)control ).Font = new Font("Arial", 10, FontStyle.Regular);
        }
   }
}

Calling the function:

cambiar_fuentes(panel1);

How can I change only the font of the labels (1 to 10) that belong to the form itself?

EDITED

Designer.cs Code Snippet: 

        this.panel1.BackColor = System.Drawing.Color.Transparent;
        this.panel1.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
        this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.panel1.Controls.Add(this.flowLayoutPanel1);
        this.panel1.Location = new System.Drawing.Point(1, 1);
        this.panel1.MaximumSize = new System.Drawing.Size(295, 2);
        this.panel1.MinimumSize = new System.Drawing.Size(2, 732);
        this.panel1.Name = "panel1";
        this.panel1.Size = new System.Drawing.Size(295, 732);
        this.panel1.TabIndex = 5;

         this.flowLayoutPanel1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
        | System.Windows.Forms.AnchorStyles.Left)));
        this.flowLayoutPanel1.AutoScroll = true;
        this.flowLayoutPanel1.BackColor = System.Drawing.Color.Transparent;
        this.flowLayoutPanel1.Controls.Add(this.userControl1);
        this.flowLayoutPanel1.Controls.Add(this.userControl2);
        this.flowLayoutPanel1.FlowDirection = System.Windows.Forms.FlowDirection.TopDown;
        this.flowLayoutPanel1.Location = new System.Drawing.Point(1, 34);
        this.flowLayoutPanel1.Name = "flowLayoutPanel1";
        this.flowLayoutPanel1.Size = new System.Drawing.Size(292, 684);
        this.flowLayoutPanel1.TabIndex = 29;
        this.flowLayoutPanel1.WrapContents = false;

        this.userControl1.Controls.Add(this.label1);
        this.userControl1.Controls.Add(this.label2);

Here this.uersControl1.Controls.Add(this.label1);continue the other labels...

Environment: Visual Studio 2010 & .NET Netframework 4.

c#

3 Answers

  1. Best Answer

    You could create a read-only property on your UserControlthat returns the list of controls added to it. Not including those of the user control.

    According to the code of the control on which you have based it, it would be something like this

     public IEnumerable<Control> PanelControls
{
    get
    {
        var panelControls = new List<Control>();
        foreach (Control control in Controls)
        {
            if (control != titlePanel) panelControls.Add(control);
        }
        return panelControls;
    }
}

    In this way, the property PanelControlsonly returns the controls added to the user control, not its own, and you could go through them and change the font or any other property you want.

    cambiar_fuentesYou could change the method to a generic method in which you indicate the type of control to which you want to apply the change, and pass the source :

    private void CambiarFuentes<T>(IEnumerable<Control> controls, Font newFont) where T: Control
{
    var controlList = controls as Control[] ?? controls.ToArray();
    if (!controlList.Any()) return;
    foreach (var toChangeControl in controlList.OfType<T>())
    {
        toChangeControl.Font = newFont;
    }
    CambiarFuentes<T>(controlList.SelectMany(x => x.Controls.OfType<Control>()), newFont);
}

    In this way to change all the fonts of the Labels included in the controls CollapsiblePanelyou could do:

    foreach (var collapsiblePanel in Controls.OfType<CollapsiblePanel>())
{
    CambiarFuentes<Label>(collapsiblePanel.PanelControls, new Font("Arial", 10, FontStyle.Regular));
}

    If you prefer to keep the current format you can check in the method cambiar_fuentesif the containing control is a control of type CollapsiblePanel. If so you loop through the collection PanelControlsand if not the collection Controls:

    private void cambiar_fuentes(Control contenedor)
{
    var panel = contenedor as CollapsiblePanel;
    var controlList = panel != null
        ? panel.PanelControls
        : contenedor.Controls.OfType<Control>();
    foreach (Control control in controlList)
    {
        if (control.Controls.Count > 0)
            cambiar_fuentes(control);
        else
        {
            if (control is Label) ((Label)control).Font = new Font("Arial", 10, FontStyle.Regular);
        }
    }
}

    This way you could keep making the same call:

    cambiar_fuentes(panel1);
    • 5

  2. It occurs to me that you could discriminate between usercontrols when evaluating whether the control has inner controls like so:

    private void cambiar_fuentes(Control contenedor)
{
    foreach (Control control in contenedor.Controls)
    {
        if (control.Controls.Count > 0 && !(control is usercontrol))
           cambiar_fuentes(control);
        else
        {
           if (control is Label) ((Label)control ).Font = new Font("Arial", 10, FontStyle.Regular);
        }
   }
}

    Note that you have to substitute usercontrolwith the class name of your user control.

    This way you prevent user controls from being inspected.

    • 3

  3. Hello, you can do the following Recover from a control, in this case your form those of type Labelin the following way

    private void cambiar_fuentes(Control contenedor)
{
  foreach (var c in contenedor.Controls.OfType<Label>())
  {
    c.Font = new Font("Arial", 10, FontStyle.Regular);

  } 
}

    Then you would call it like this in your form

    cambiar_fuentes(this);
    • 3