How does one go about finding the month name in C#? I don't want to write a huge switch statement or if statement on the month int. In VB.Net you can use MonthName(), but what about C#?
You can use the CultureInfo to get the month name. You can even get the short month name as well as other fun things.
I would suggestion you put these into extension methods, which will allow you to write less code later. However you can implement however you like.
Here is an example of how to do it using extension methods:
using System;
using System.Globalization;
class Program
{
static void Main()
{
Console.WriteLine(DateTime.Now.ToMonthName());
Console.WriteLine(DateTime.Now.ToShortMonthName());
Console.Read();
}
}
static class DateTimeExtensions
{
public static string ToMonthName(this DateTime dateTime)
{
return CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(dateTime.Month);
}
public static string ToShortMonthName(this DateTime dateTime)
{
return CultureInfo.CurrentCulture.DateTimeFormat.GetAbbreviatedMonthName(dateTime.Month);
}
}
Hope this helps!
Use the "MMMM" format specifier:
string month = dateTime.ToString("MMMM");
string CurrentMonth = String.Format("{0:MMMM}", DateTime.Now)
Supposing your date is today. Hope this helps you.
DateTime dt = DateTime.Today;
string thisMonth= dt.ToString("MMMM");
Console.WriteLine(thisMonth);
If you just want to use MonthName then reference Microsoft.VisualBasic and it's in Microsoft.VisualBasic.DateAndTime
//eg. Get January
String monthName = Microsoft.VisualBasic.DateAndTime.MonthName(1);
private string MonthName(int m)
{
string res;
switch (m)
{
case 1:
res="Ene";
break;
case 2:
res = "Feb";
break;
case 3:
res = "Mar";
break;
case 4:
res = "Abr";
break;
case 5:
res = "May";
break;
case 6:
res = "Jun";
break;
case 7:
res = "Jul";
break;
case 8:
res = "Ago";
break;
case 9:
res = "Sep";
break;
case 10:
res = "Oct";
break;
case 11:
res = "Nov";
break;
case 12:
res = "Dic";
break;
default:
res = "Nulo";
break;
}
return res;
}
Related
I am building a form that takes an input number from a text box and then will take the number that was input, and display the roman numeral equivalent in another text box.
My Form:
private void convertButton_Click(object sender, EventArgs e)
{
int numberInput;
switch (numberInput)
This is where I keep getting an error code. The "switch (numberInput)" is seen as and unassigned local variable. How do I assign it so that it will be able to access all of the case integers?
{
case 1:
outputTextBox.Text = "I";
break;
case 2:
outputTextBox.Text = "II";
break;
case 3:
outputTextBox.Text = "III";
break;
case 4:
outputTextBox.Text = "IV";
break;
case 5:
outputTextBox.Text = "V";
break;
case 6:
outputTextBox.Text = "VI";
break;
case 7:
outputTextBox.Text = "VII";
break;
case 8:
outputTextBox.Text = "VIII";
break;
case 9:
outputTextBox.Text = "IX";
break;
case 10:
outputTextBox.Text = "X";
break;
default:
MessageBox.Show("Please enter and number between 1 and 10. Thank you!");
break;
}
Cause your variable is not assigned yet int numberInput; and so the error. You said input is coming from a TextBox, in that case do like below assuming textbox1 is your TextBox control instance name
int numberInput = Convert.ToInt32(this.textbox1.Text.Trim());
Convert.ToInt32 may throw an exception if the parsing is unsuccessful. Another method is to Int.Parse:
int numberInput = int.Parse(textbox1.Text.Trim());
or better yet
int numberInput;
if(int.TryParse(textbox1.Text.Trim(), out numberInput))
{
switch (numberInput)
...
}
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This program is supposed to get you a garfield comic from the date you entered or the daily comic. The first button should allow you to pick a custom comic but only the daily comic (button 2) seems to work Here's the code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Garfield_Comic_Viewer
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
int month = int.Parse(textBox1.Text);
int day = int.Parse(textBox2.Text);
int year = int.Parse(textBox3.Text);
switch (month)
{
case 1:
month = 01;
break;
case 2:
month = 02;
break;
case 3:
month = 03;
break;
case 4:
month = 04;
break;
case 5:
month = 05;
break;
case 6:
month = 06;
break;
case 7:
month = 07;
break;
case 8:
month = 08;
break;
case 9:
month = 09;
break;
}
switch (day)
{
case 1:
day = 01;
break;
case 2:
day = 02;
break;
case 3:
day = 03;
break;
case 4:
day = 04;
break;
case 5:
day = 05;
break;
case 6:
day = 06;
break;
case 7:
day = 07;
break;
case 8:
day = 08;
break;
case 9:
day = 09;
break;
}
pictureBox1.ImageLocation = ("http://garfield.com/uploads/strips/" +year+ "-" +month+ "-" + day + ".jpg");
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
string mon = DateTime.Now.ToString("MM");
string d = DateTime.Now.ToString("dd");
string y = DateTime.Now.ToString("yyyy");
pictureBox1.ImageLocation = "http://garfield.com/uploads/strips/" + y + "-" + mon + "-" + d + ".jpg";
DateTime whole = DateTime.Now;
}
}
}
The problem is you're expecting integers to behave like strings.
The point you're missing is that:
int a = 01;
is the same as:
int a = 1;
There's no difference. You can't pad an integer. What you need is to format the integers into a string, using a format specifier. Something like this:
pictureBox1.ImageLocation =
string.Format("http://garfield.com/uploads/strips/{0:D4}-{1:D2}-{2:D2}.jpg",
year, month, day);
This will give a string that contains the numbers in the format yyyy-mm-dd.
(The documentation for padding string-formatted integers is here.)
The best way to illustrate my question is this C# example:
//It seems that the comment is required:
//I need to change the values of someString0, someString1, or someStringN
//depending on the `type` variable
ref string strKey;
switch(type)
{
case 0:
strKey = ref someString0;
break;
case 1:
strKey = ref someString1;
break;
//And so on
default:
strKey = ref someStringN;
break;
}
//Set string
strKey = "New Value";
Can I do this in C#?
PS. I know that I can do this in a function. I'm asking about an "in-line" approach.
If you really want to do the assignment similar to the way you're asking for, here is one way that doesn't use ref
Action<string> action;
switch (type) {
case 0:
action = newVal => someString0 = newVal;
break;
case 1:
action = newVal => someString1 = newVal;
break;
case 2:
action = newVal => someString2 = newVal;
break;
default:
action = null;
break;
}
if (action != null) action.Invoke("some new value");
Performance-wise, the above takes about 8 nanoseconds longer to execute than the direct alternative below
switch (i) {
case 0:
someString0 = "some new value";
break;
case 1:
someString1 = "some new value";
break;
case 2:
someString2 = "some new value";
break;
default:
break;
}
But you're talking a little longer than next to nothing. On my not particularly fast laptop, the Action version takes around 13 nanoseconds to execute vs. the direct assignment method that takes around 5.5 nanoseconds. Neither is likely to be a bottleneck that matters.
why are you splitting this up into a switch and then an assignment later? why not just set the value in the switch and avoid the ref behavior at all?
string newValue = "new value";
switch(type)
{
case 0:
someString0 = newValue;
break;
case 1:
someString1 = newValue;
break;
//And so on
default:
someStringN = newValue;
break;
}
Why don't you just set the correct string variable like this:
switch(type)
{
case 0:
someString0 = "New Value";
break;
case 1:
someString1 = "New Value";
break;
//And so on
default:
someStringN = "New Value";
break;
}
An even better approach is to replace your n string variables with an array of strings so that the assignment becomes a single line of code:
string[] someString;
someString[type] = "New Value";
int MM;
int DD;
int YYYY;
switch(MM)
{
case 1:
DD = 31;
break;
case 2:
DD = 28;
LDD = 29;
break;
case 3:
DD = 31;
break;
case 4:
DD = 30;
break;
case 5:
DD = 31;
break;
case 6:
DD = 30;
break;
case 7:
DD = 31;
break;
case 8:
DD = 31;
break;
case 9:
DD = 30;
break;
case 10:
DD = 31;
break;
case 11:
days = 30;
break;
case 12:
DD = 31;
break;
default:
{
Console.WriteLine("Invalid option");
}
}
if(Date == MM/DD/YYYY)
string Date = Console.ReadLine();
I am trying to write a code that would accept the date as string and only in this format mm/dd/yyyy and the time has to accepted only in this format 10:00AM
By using DateTime i am getting the time in this format 10:00:00, the hour,minute,second format which i don't want.
I dont want to use try catch, exception.
Use DateTime.ParseExact and write your format string following these guidlines:
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx
You can use DateTime.ParseExact method and write your format definition in its second parameter.
I suggest DateTime.TryParseExact, this will check if the string is in the format you want, and return false if it isn't, and return true and populate your date if it is.
You should go with DateTime.TryParseExact, as this method doesn't throws an exception for invalid dates:
DateTime parsed;
var input = "08/03/2013 08:30AM";
if (DateTime.TryParseExact(input, "MM/dd/yyyy hh:mmtt", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsed))
Console.WriteLine("ok");
else
Console.WriteLine("not ok");
I am wondering if there is way to have the user enter a number like 01 and have that string converted to the month using dateTime. I know how to have the user enter a string such as 01/01/2011 and have the converted to a DateTime. Is there a way to use datetime to convert a two number string into a month. Something like this, but that would work
Console.WriteLine("Please the month numerically");
string date = Console.ReadLine();
dt = Convert.ToDateTime(date).Month;
You could probably get it jumping through some hoops with DateTime, however;
CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(int monthNumber);
is probably easier.
It is already built into the .NET framework: see System.Globalization.DateTimeFormatInfo.MonthNames
It'd be easier to just have an array of 12 elements, each being a month.
String[] Months = new String[] {"Jan", "Feb"}; //put all months in
Console.WriteLine("Please the month numerically");
string date = Console.ReadLine();
int index = 0;
if (!int.TryParse(date, out index)) {
// handle error for input not being an int
}
dt = Months[index];
If you really wanted to stick with using the DateTime class, you could take in the month and then tag on some day and year and use the method you provided in your code. For example...
dt = Convert.ToDateTime(date + "/01/2012").Month;
But this is less advised.
Your example is not complete, cause you need to specify which year and which day in the date.
Assuming that that data have to be of the current date, you can do something like this:
DateTime dt = new DateTime(DateTime.Now.Year, int.Parse("01"), DateTime.Now.Day);
Don't forget, obviously, add a couple of controls, like
Month range {1-12}
Month string is a number
EDIT
int month =-1;
if(int.TryParse(userInputString, out month)){
if(month>=1 && month <=12) {
DateTime dt = new DateTime(
DateTime.Now.Year,
month,
DateTime.Now.Day);
}
}
Hope this helps.
public static string ReturnMonthName(string pMonth)
{
switch (pMonth)
{
case "01" :
return "January";
case "02":
return "February";
case "03":
return "March";
case "04":
return "April";
case "05":
return "May";
case "06":
return "June";
case "07":
return "July";
case "08":
return "August";
case "09":
return "September";
case "10":
return "October";
case "11":
return "November";
case "12":
return "December";
default:
return "Invalid month";
}
Strip the month from your datetime and use a switch/case select to assign your variable.
switch (val)
{
case 1:
MessageBox.Show("The day is - Sunday");
break;
case 2:
MessageBox.Show("The day is - Monday");
break;
case 3:
MessageBox.Show("The day is - Tuesday");
break;
case 4:
MessageBox.Show("The day is - wednesday");
break;
case 5:
MessageBox.Show("The day is - Thursday");
break;
case 6:
MessageBox.Show("The day is - Friday");
break;
case 7:
MessageBox.Show("The day is - Saturday");
break;
default:
MessageBox.Show("Out of range !!");
break;
}