Sheva07 Sheva07 - 1 year ago 94
C# Question

Unable to cast object of type 'System.Windows.Forms.FlowLayoutPanel' to 'System.Windows.Forms.Button c#

I have an app where I have many buttons inside so to differentiate them, I create a class in which I put this:
I have to say that my button is in a FlowLayoutPanel.

public static void SetButtonPos(Form f1,FlowLayoutPanel fk)

foreach (Button c in f1.Controls)

c.Size= new Size(247, 45);
c.BackColor = ColorTranslator.FromHtml("#373737");
c.ForeColor = ColorTranslator.FromHtml("#FFFFFF");
c.FlatStyle = FlatStyle.Flat;
c.FlatAppearance.BorderSize = 0;
c.TextAlign = ContentAlignment.MiddleLeft;
c.TextImageRelation = TextImageRelation.ImageBeforeText;
c.Height = 45;
c.Width = fk.Width - 6;



But I got the error in the title, do you have any idea ?

Unable to cast object of type 'System.Windows.Forms.FlowLayoutPanel' to 'System.Windows.Forms.Button

Thank you.

Answer Source

This line is incorrect

foreach (Button c in f1.Controls)

Here you consider that each control in f1 is a button, so also textboxes and other controls will trigger your error. Instead if you want only buttons change your code to

foreach (Button c in f1.Controls.OfType<Button>())

Keep in mind that this will find only Buttons that are directly contained in the Controls collection of your form. If they are inside another container (like a groupbox or panel) the line above will not work and you should use the appropriate container or a recursive call to traverse every Controls collection


If your button is inside the controls collection of the FlowLayoutPanel then the code should search your button in that collection

foreach (Button c in fk.Controls.OfType<Button>())
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