How do I format user input in visual studio C# in my maskedtextbox from fx: 10-02-2020 to 10- febuary-2020

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// I have created a small form where the user has to input the date and the form will convert it from the user input fx: 10-02-2020 to 10-Febuary-2020 - and this is the code that i got so far, but im currently stuck

string dag, month, year;
       private void buttonOK_Click(object sender, EventArgs e)
       {


           string date = maskedTextBoxDato.Text;


           string day = dato.Substring(0, 2);
           string month = dato.Substring(3, 2);
           string year = dato.Substring(6, 4);


           switch (maskedTextBoxDato.Text)
           {
               case "01":
                   labelFacit.Text = "Januar";
                   break;
               case "02":
                   labelFacit.Text = "Februar";
                   break;
               case "03":
                   labelFacit.Text = "Marts";
                   break;
               case "04":
                   labelFacit.Text = "April";
                   break;
               case "05":
                   labelFacit.Text = "Maj";
                   break;
               case "06":
                   labelFacit.Text = "Juni";
                   break;
               case "07":
                   labelFacit.Text = "Juli";
                   break;
               case "08":
                   labelFacit.Text = "August";
                   break;
               case "09":
                   labelFacit.Text = "Septemper";
                   break;
               case "10":
                   labelFacit.Text = "Oktober";
                   break;
               case "11":
                   labelFacit.Text = "November";
                   break;
               case "12":
                   labelFacit.Text = "December";
                   break;

               default:
                   labelFacit.Text = "Fejl";
                   break;
           }

What I have tried:

I have tried adding and deleting code mulitiple times and severeal google searches.

Posted 14-Mar-20 4:04am

OliverAL

Updated 14-Mar-20 6:16am

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2 solutions

Solution 1

You should use a DatePicker Class (System.Windows.Controls) | Microsoft Docs[^] then you will not need any of the above code. Get to know the .NET classes so you can focus on the business parts of your application.

Posted 14-Mar-20 4:45am

Richard MacCutchan

Comments

OliverAL 14-Mar-20 10:51am

I have to use the switch method, it´s required for the assignment unfortunately

Richard MacCutchan 14-Mar-20 12:13pm

OK, so what is the problem?

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MadMyche · Accepted Answer · 2020-03-14T06:16:00

There are 2 fundamental portions to the task at hand:
1. Understand what the user has input as a DateTime object
2. Display that same DateTime object is a specific format.

For the first part, the best thing is to utilize the DateTime.TryParse method.

C#

string dag, month, year;

private void buttonOK_Click(object sender, EventArgs e)
{
	string date = maskedTextBoxDato.Text;

	DateTime dto;
	if (!DateTime.TryParse(date, out dto))
	{
		// There was a problem reading the user input
		// perhaps regionalization may help out
	} else {
		// to be continued

And the second part of your task is going to be displaying this.
Normally the recommended way would be simply use the ToString method and utilize either the Standard- or Custom Date and Time format strings.
However... you apparently need to use a switch...case block for formatting the date.
As we did get a valid DateTime object in the first part of this, that means we have the various properties; such as Year, Month, and Date- all as properties of type Int. This will make things easier as you don't need to worry about leading zeroes not being there; for instance on 10-2-2020 vs 10-02-2020.

C#

string MonthName;

switch(dto.Month) {
	case 1:
		MonthName = "Januar";
		break;
	// etcetera
}
labelFacit.Text = MonthName;

The rest of your date components will be easy conversions as well, simply using the ToString method on those properties as well.

C#

string day = dto.Day.ToString();
string month = dto.Month.ToString();
string year = dto.Year.ToString();

And if you need the leading zeroes, there are Standard Numeric Format strings available

References:
DateTime.TryParse Method (System) | Microsoft Docs[^]
DateTime.Month Property (System) | Microsoft Docs[^]
Standard date and time format strings | Microsoft Docs[^]
Custom date and time format strings | Microsoft Docs[^]
Standard numeric format strings | Microsoft Docs[^]