Can you keep the 0s when parsing a string from an int? c#-CodePudding

I'm making a 2d array of buttons, and want its tag to be its array position, including the starting 0s and ending 0s (e.g 01 or 2002)... is this possible?

 Button[,] buttonGrid = new Button[11, 21];

Button gridButton = new Button
                    {
                        Tag = int.Parse(yIndex.ToString()   xIndex.ToString()),
                        BackColor = Color.LightGray,
                        Enabled = true,
                        Size = new Size(size, size),
                        Location = new Point(25, 25)
                    };

I used a for loop to loop through each element in the array thats where the x and y index come from.

this will return 1,2,3 - 9 in the first row then 10, 11, 12, so on. but I want it to be 01, 02, 03 or 020.

CodePudding user response：

If you need preceding zeros in your int, I would suggest you keep the position as a string. When you need to calculate it, just convert it to int temporarily and perform the calculations. You can assign anything in the Tag.

CodePudding user response：

You should probably not rely on string concatenation to create the tags. since you have no idea if "111" means x=1, y=11 or x=11, y=1 Tags are used internally to distinguish UI objects. Normally when converting two coordinates to a single index you would do a calculation like

var i = yIndex * width   xIndex;

and this can be reversed:

var yIndex = i / width;
var xIndex = i - yIndex * width;

If you want the number to be in the format XXYY, then you can simply use 100 as the width. If you want to convert this to a text-label you can use a format specifier when converting it to string, i.e. i.ToString("0000")