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hi i have a file..
and another both in the same project...
one class is being derieved form another
but the prob is : i am getting error
i have the above two files and both have main..but one is derieved from another....Quote:
CsDateInheritance.exe' has more than one entry point defined: 'CsDateConstructors.Main()'
CsDateInheritance.exe' has more than one entry point defined: 'CsDateInheritance.Main()'
why am i getting this error??:(
pls help...
tks...
Hi, what I would is remove the Main() methods from both classes, then create a third class that does not inherit from anything and add a Main() method there.Quote:
Originally posted by Joseph_R_Thomas
i have the above two files and both have main..but one is derieved from another....
why am i getting this error??:(
pls help...
tks...
Something like this:
JimCode:public class CsDateConstructors
{
}
public class CsDateInheritance : CsDateConstructors
{
}
public class MyMain
{
static void Main(string[] args)
{
CsDateInheritance myInheritence = new CsDateInheritance();
}
}
i dun wanna do that...i am following a example and i am using the same exact codes...
the example runs fine/......
but mine doesnt./..
every word in the two files are same...
still mine doesnt run...
Can you post your code so I can take a look?
Jim
Code:using System;
class CsDateConstructors
{
public static void Main()
{
try
{
Date mydate = new Date(2001, 8, 29);
Console.WriteLine("Day of year = " + mydate.DayOfYear);
}
catch (Exception exc)
{
Console.WriteLine(exc);
}
}
}
class Date
{
// Fields
int year;
int month;
int day;
static int[] MonthDays = new int[] { 0, 31, 59, 90, 120, 151,
181, 212, 243, 273, 304, 334 };
// Constructors
public Date()
{
Year = 1600;
Month = 1;
Day = 1;
}
public Date(int year, int month, int day)
{
if ( (month == 2 && IsLeapYear(year) && day > 29) ||
(month == 2 && !IsLeapYear(year) && day > 28) ||
((month == 4 || month == 6 ||
month == 9 || month == 11) && day > 30))
{
throw new ArgumentOutOfRangeException("Day");
}
else
{
Year = year;
Month = month;
Day = day;
}
}
// Properties
public int Year
{
set
{
if (value < 1600)
throw new ArgumentOutOfRangeException("Year");
else
year = value;
}
get
{
return year;
}
}
public int Month
{
set
{
if (value < 1 || value > 12)
throw new ArgumentOutOfRangeException("Month");
else
month = value;
}
get
{
return month;
}
}
public int Day
{
set
{
if (value < 1 || value > 31)
throw new ArgumentOutOfRangeException("Day");
else
day = value;
}
get
{
return day;
}
}
public int DayOfYear
{
get
{
return MonthDays[month - 1] + day +
(month > 2 && IsLeapYear(year) ? 1 : 0);
}
}
// Method
public static bool IsLeapYear(int year)
{
return (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0));
}
}
Code:using System;
class CsDateInheritance
{
public static void Main()
{
DatePlus birth = new DatePlus(1953, 2, 2);
DatePlus today = new DatePlus(2001, 8, 29);
Console.WriteLine("Birthday = {0}", birth);
Console.WriteLine("Today = " + today);
Console.WriteLine("Days since birthday = {0}", today - birth);
}
}
class DatePlus: Date
{
public DatePlus() {}
public DatePlus(int year, int month, int day): base(year, month, day) {}
public int DaysSince1600
{
get
{
return 365 * (Year - 1600) +
(Year - 1597) / 4 -
(Year - 1601) / 100 +
(Year - 1601) / 400 + DayOfYear;
}
}
public override string ToString()
{
string[] str = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
return String.Format("{0} {1} {2}", Day, str[Month - 1], Year);
}
public static int operator -(DatePlus date1, DatePlus date2)
{
return date1.DaysSince1600 - date2.DaysSince1600;
}
}
I think you want to have three projects, one containing the CsDateConstructors class, another project containing the CsDateInheritance class and a third containing the Date classes. Then to run one and not the other you simply set it as the startup project. This way all of the Main() methods are seperate
I've seperated your projects so you can see how it is done. The Date classes are compiled as a Class Library which means only a .DLL is created. The other two are compiled as Console Applications and each creates an executable (.exe). In order to use this .Dll, you need a using statement (which I have put in for you) and you need to add a reference to the .Dll for each project that will be using it. You do this by first setting a project as the startup project, then go to the Project Menu and select the Add Reference. Then select the .Dll you wan to use and select OK. I've done this for you in the attached project.
You'll get used to doing this the more you do it.
Your Date classes work very well, great job!
I hope this helps. Let me know if you have any proplems or questions.
Jim
More than one main requires that you specify the startup
object.
From the DevStudio menu
Project/ "My Project" properties.
On the properties property sheet; common options. Look for
'Startup Object" and set it.
If you build it from command line, then you can use one of the compiler options "main"
Ex:
csc /t:exe /out:test.exe /main:ConsoleApplication13.Class1 Class1.cs Class2.cs
Class1 and Class2 both have main method declared in them.
i am not using command line
m using visual studio.net
its in the same project.......Quote:
Originally posted by mdmd
More than one main requires that you specify the startup
object.
From the DevStudio menu
Project/ "My Project" properties.
On the properties property sheet; common options. Look for
'Startup Object" and set it.
both the mains are in the same project....
just different files....
well....i think i should probably post the project...
maybe that will say better than my words...
i need to get the "Project2" working....
tks for help...:)
then the only way to do it is to comment out one of the Main methods so that the other can run. The language simply does not allow two main methods and there's nothing you can do to change that.Quote:
Originally posted by Joseph_R_Thomas
its in the same project.......
both the mains are in the same project....
just different files....
Jim
did you download the project I attached for you? I got both projects to work there.Quote:
Originally posted by Joseph_R_Thomas
well....i think i should probably post the project...
maybe that will say better than my words...
i need to get the "Project2" working....
tks for help...:)
Jim
i cannot open it...my vs.net version is old...
nope...i have a version that is exactly same codes and its working fine...
there's gotta be some other trick...
Quote:
Originally posted by xucaen
then the only way to do it is to comment out one of the Main methods so that the other can run. The language simply does not allow two main methods and there's nothing you can do to change that.
Jim
This setting in the project properties dialog must be set if moreQuote:
From the project properties dialog
Startup Object
The name of the class that contains the Main method that you
want called on program startup. The ( Not set ) option is valid if
there is only one Main.
than 1 class has a Main. Several classes can have a Main but
only one of them can be set as the Startup Object. If you have
more than one Main and the Startup Object is not set than you'll
get this error.
OP. What version of the .net compiler are you using and did you
set the startup object ?
if you download my project below you'll see that project 2 is already set as startup project.
now the problem is project 2 has a link up woth a file in project 1 therefore it will have 2 mains...
1 from project1's .cs file and one - itw own cs file....
now i cant comment out one of the main cause it can be worked that way....
there is a catch somewhere cant figure it out....
any help in appreciated.
I opened the project. No startup object was set. I set the
startup object and it built fine.
Are you sure you're specifying
"startup object" ? This is different from "startup project"
I think you are getting confused with start up PROJECT and startup OBJECTQuote:
Originally posted by Joseph_R_Thomas
if you download my project below you'll see that project 2 is already set as startup project.
1. open up your solution in VS.Net
2. Select "Project2" (your start up project)
3. right click -> Properties
4. Under "Common properties", select "General"
5. In the right side panel (grid), look for "Start up object". There, set the class which has the main method you want to be called when you launch the application.
Poochi...
tks a lot guys.....it works now.....
one question...wahts up with the startup object???
wats all this used for??
tks a lot