C# Discussion Boards - CodeProject

trønderen16-Dec-21 9:10

trønderen

16-Dec-21 9:10

Try to do the same with a plain string variable, rather than txtMensaje.Text!

On each iteration, the string value is replaced. The last assignment applies.

If you want to append the lines, one after one other, you use +=, rather than = (regardless of whether you are appending to a plain string or the contents of a text box).

OriginalGriff16-Dec-21 9:50

16-Dec-21 9:50

You can't use a loop for that: when an event is raised your handler is called and nothing else happens until your event handler hits the return statement (or the end of the method) - and that very much include display updates!

So reading the lines in a loop does nothing useful, because the Paint event isn't actioned until after the last line has been displayed - so the only thing your user will ever see is the last line!

If you want to do that, you will need to set up a Timer (with an Interval that says how long you want each line displayed for) and kick it off in your button Click event.
Inside the Timer.Tick handler, copy just one line to the textbox, and set up for the next by moving an index on one. Then exit (remembering to cancel the timer when you run out of lines).

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Eddy Vluggen17-Dec-21 1:14

Eddy Vluggen

17-Dec-21 1:14

..looks more like he is overwriting the property with the contents of each row. Run it, and only the last row is visible.

I don't think he intends the user to click a button to get "one new row" of data, but I could be mistaken. If that's the intention, then simply load the table and use a pointer, instead of mucking with timers.

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OriginalGriff17-Dec-21 1:42

17-Dec-21 1:42

What I believe he expects is that each time round the loop a single line of text should be briefly visible - and a Timer is the best solution to that.

That's how I read the original post, anyway.

MonthCalendar - Adding a date without having the month or year.

Eddy Vluggen17-Dec-21 2:58

Eddy Vluggen

17-Dec-21 2:58

That's also an option, true Big Grin | :-D

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Richard A Knox16-Dec-21 3:06

Richard A Knox

16-Dec-21 3:06

Good morning,

I have been playing around with monthCalendar and been having some issues understanding if I can do something. In my program, my user gets paid on the 15th and EOM, I am trying to highlite each 15th as a paydate and then figure out each EOM and highlight that as well. But, it seems that all I can find is that you have to do "FULL" dates "2021, 12, 15", or am I missing something.

Is there a good tutorial out there to help me understand how to do what I want to do?

Richard
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Grandfather
Pain in the @ss

Re: MonthCalendar - Adding a date without having the month or year.

PIEBALDconsult16-Dec-21 3:07

PIEBALDconsult

16-Dec-21 3:07

The first of the next month, minus one day.

Re: MonthCalendar - Adding a date without having the month or year.

OriginalGriff16-Dec-21 4:09

Re: MonthCalendar - Adding a date without having the month or year.

16-Dec-21 4:09

Is this what you are looking for?
MonthCalendar.MonthlyBoldedDates Property (System.Windows.Forms) | Microsoft Docs[^]

#realJSOP17-Dec-21 2:40

re-create a local database

17-Dec-21 2:40

You can use

DateTime today = DateTime.Now;
int lastDay = DateTime.DaysInMonth(today.Year, today.Month);

That particular example would return 31 for December 17 2021 (today's date).

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steven_noppe15-Dec-21 20:04

steven_noppe

15-Dec-21 20:04

I have a Visual C# .net application hosted on a git.
When I recently moved to a new laptop and re-installed visual studio, I cloned the repository succesfully, but i can not publish / run the application anymore because it's complaining about a lost "database.mdf" file.

error MSB3113: Could not find file 'AppData\Database.mdf'
error MSB3113: Could not find file 'AppData\Database_log.ldf

On my old laptop the location of the database was in the "AppData" directory. Offcourse it's not there anymore.

But my thought was that the project would re-create the database and make a whole new one.

Is this still possible and how do I do this?

Re: re-create a local database

OriginalGriff15-Dec-21 20:54

Re: re-create a local database

15-Dec-21 20:54

No, it's not. If it's not part of the git repository, it isn't included - just "accessing it from your code" doesn't make it part of the repository any more than a git-based project to write letters would automatically push each letter to the Git server.
Git is about source code, not data - it is not a backup system!

A database is data which in your case resides on your laptop: that isn't part of your Git project, so it isn't added to the repository. You will have to copy it manually to your new device.

#realJSOP16-Dec-21 2:39

Re: re-create a local database

16-Dec-21 2:39

If the database wasn't part of your project checkin, then you're going to have to recreate it manually.

This is precisely why I don't use MDF files. Instead I use SQL Server instance on a different box, rather than my dev box. That way, when I move to a different system, the database is always there (assuming the server box itself hasn't gone tits up).

jschell23-Dec-21 5:50

jschell

23-Dec-21 5:50

Err...and of course presumably back ups of the db are being taken.

How do i gate the previous values in Crystal repor

remiki14-Dec-21 7:37

remiki

14-Dec-21 7:37

Hello, i have trie this code and i get only the values of the date selectionned, but i need to show if the currect date does not exist, to show the previews values in crystal repor, how can i use previous () fonction?

for example

if ({myadate.datelqd}={?date}) then{mydate.restrlqd}={mydate.restrlqd}
else if mydate does not exists then show previews value

here is what i have tried

if ({?date}={mydate.datelqd}) then {mydate.restrlqd}={mydate.restrlqd}

but I want that when the requested date is not in the database, that I display the last recording for example
on 10/12/2021 i have qty = 55
on 13/12/2021 i qty = 85
on 14/12/2021 I have qty = 55

when I enter 12/12/2021 for example, let it display the data for 10/12/2021 where the qty = 55

modified 14-Dec-21 14:52pm.

Re: How do i gate the previous values in Crystal repor

remiki16-Dec-21 0:56

remiki

16-Dec-21 0:56

urgent, please

Parse from string

Member 1546737514-Dec-21 4:00

Member 15467375

14-Dec-21 4:00

Let's write our own Point class

using System;
namespace PointNamespace
{
    public class Point
    {
        public int X{get;set;}
        public int Y{get;set;}
        public Point(int x = 0,int y=0)
        {
           X = x;
           Y = y;
        }
        public bool TryParse(string s,out Point p)
        {
            // Here is code for your function
        }
        public override string ToString()
        {
           return string.Format("({0},{1})",X,Y);
        }
    }
}

How can I write TryParse method
I would like to use methods like
string.Trim() ,
int.TryParse(string s, out int d),
string.IndexOf(); // Here is few overloads and which should I choose
string.Substring(int startIndex,int length);
Format of parsed string is shown in ToString method

Suppose we want also version for double coordinates
how method TryParse should look like then
In my native language comma and dot are switched in meaning when displaying
numbers and C# includes that

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Pete O'Hanlon14-Dec-21 5:21

Pete O'Hanlon

14-Dec-21 5:21

Think about what you are trying to achieve here. Your point class is constrained to using integers so you can put in a constraint that you only accept integers in your string so you can remove any "requirement" that is decimal based. You also have to decide what format you are going to accept your string in, and set rules on it. Personally speaking, I would use Point.Parse[^] as an example.

jsc4214-Dec-21 6:55

jsc42

14-Dec-21 6:55

Point.Parse does not seem to cater for the fact that the OP has 'swapped' commas and periods in his/her locale. Nor is it clear if the '(' and ')' are mandatory / banned / optional. The best that I have come up with is ...

public static bool TryParse(string s, out Point p)
{
    int x = 0;  // Temp values to hold x and y coordinates of the parsed Point
    int y = 0;

    // String can optionally be surrounded by '(' and ')' and values can be separated by ',' or '.' e.g.
    //  (x,y)
    //  x,y
    //  (x.y)
    //  x.y
    string unparenthesisedValue =
        s.StartsWith("(") && s.EndsWith(")")
        ? s.Substring(1, s.Length - 2)  // Strip off '(' and ')'
        : s;    // No parentheses

    string[] parts = unparenthesisedValue.Split(',');   // Look for x,y
    if (parts.Length != 2)  // Not x,y
        parts = unparenthesisedValue.Split('.');    // Look for x.y

    //Console.Write($"s = {s}, Len = {parts.Length}, Parts = [{ String.Join(", ", parts)}]");

    bool validPoint =
        parts.Length == 2   // Two numbers
        && int.TryParse(parts[0], out x)    // First number looks OK
        && int.TryParse(parts[1], out y);   // Second number looks OK

    p = new Point(x, y);
    return validPoint;
}

This will parse with '(' and ')' as optional (both or neither; but not just one of the pair; either ',' or '.' as separator; any spaces either side of the numbers. If you have more than one '.' or ',' it gets rejected as there are either too many components of you have floating point nos.

#realJSOP15-Dec-21 0:35

15-Dec-21 0:35

You don't have to check for parens before deleting them. This will work:

// remove parens, remove all spaces, and trim the ends. You should end up with a 
// pure string for parsing.
s = s.Replace("(", "").Replace(")", "").Replace(" ", "").Trim();

I would also make the parser work more generally:

List<string> parts = new List<string>();
// restrict the number of parts to 2
parts.AddRange(s.Split(new char[]{',' }, 2));
// fill in missing "parts" to compensate for 1 or no values
// (string would be "1" or empty)
while (parts.Count < 2)
{
    parts.Add("0");
}
// make a valid value for parts that are present but not specified
// string would be "1,", or ",2"
for(int i = 0; i < parts.Count; i++)
{
    int value;
    if (Int32.TryParse(parts[i], out value))
    {
        parts[i] = value.ToString();
    }
    else
    {
        parts[i] = "0";
    }
}

At this point you now have a reasonably valid list of values, and you can use the .net Int32.TryParse() method.

int x;
if (!Int32.TryParse(parts[0], out x))
{
    x = 0;
}
int y; 

if (!Int32.TryParse(parts[0], out y))
{
    y = 0;
}

// by the time you get here, x and y are valid integer values
Point myPoint = new Point(x,y);

EDIT ====================
Fixed some code typos

modified 15-Dec-21 13:03pm.

jsc4215-Dec-21 0:49

jsc42

15-Dec-21 0:49

All good points (no pun on Point() intended). But it depends on what Point.TryParse() is meant to be parsing. A text like )(, could be parsed as meaning (0, 0) which (I think) your modifications allow, or it could be treated as being syntactically invalid. We don't have a specification of what the OP had intended to be valid and what was intended to be invalid.

#realJSOP15-Dec-21 6:54