C# Windows Forms 应用：更改控件所有实例的行为

Question

I would like to change the increment values and decimal places for all of my numeric updowns.

I know I can do this individually with

numericUpDownName.DecimalPlaces = 2; and numericUpDownName.Increment = 0.01M;

What is the best approach to do this efficiently? I could create methods in Form1.cs for each numeric updown but that seems pretty bulky.

I tried creating a subclass that inherits numeric updowns but I'm still not sure how I can utilize it to make all the controls work the same way without having to initialize each numeric updown as member of that class in Form1.cs.

class numberInput : NumericUpDown { }

Answer 1

How are you creating all those NumericUpDown controls? If you're doing it in the designer, then that's the place to set the properties to what you want.

If you're creating them programmatically, then change the properties there instead.

If for some reason you can't do either of those things (but why?) then you could use reflection to set them all like so. This method assumes that it will be a member of the form containing the NumericUpDown controls, and that the controls are all at the top level (ie not contained in a Panel or other such container control):

void setNumericUpDownProperties()
{
    foreach (var numericUpDown in this.Controls.OfType<NumericUpDown>())
    {
        numericUpDown.DecimalPlaces = 2;
        numericUpDown.Increment = 0.01M;
    }
}

(This requires using System.Linq; )

You would call that after the call to InitializeComponent() in the form's constructor.