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Equations may look like code, but in practice they are very different.
You need to ask a physicist, not a developer.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hi,
I have a string that may contains several hashtags starting with # like this example:
"Hello, I am #Hashtag1 and #Hashtag2"
I want to save those hashtags, as many as they are, in an array.
Can anyone help me how to do it.
Thank you in advance.
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Use a regex to identify them:
\#\w*
You can then use the Regex.Matches to convert them to a collection with Linq methods:
string[] hashtags = Regex.Matches(myDate, @"\#\w*").Cast<Match>().Select(m => m.Value).ToArray();
[edit]Matches, not Match, Griff  [/edit]
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
modified 2-Jul-15 15:20pm.
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That should be Regex.Matches, not Regex.Match.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Clearly, I read what I meant to type... 
Thanks!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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thank you so much, it worked perfectly 
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You're welcome!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I have written a 3 by 3 matrix program where I assume that the matrix represents the circle. It is able to tell the coordinates of the axes as well as the origin.
For example a 3 by 3 matrix, it will display these results which are what I want. The program will find the origin automatically by taking the 3 minus by 1 then divide by 2.
Index=[0,0](x,y)=(-38,38)
Index=[0,1](x,y)=(0,38)
Index=[0,2](x,y)=(38,38)
Index=[1,0](x,y)=(-38,0)
Index=[1,1](x,y)=(0,0)
Index=[1,2](x,y)=(38,0)
Index=[2,0](x,y)=(-38,-38)
Index=[2,1](x,y)=(0,-38)
Index=[2,2](x,y)=(-38,-38)
However, when I want to do a 4 by 4 matrix and so on, the result of the coordinates does not match with my calculation. Is there any formula for this?
1 unit=38
4 by 4 matrix would be
Index=[0,0] (x,y)=(-76,76)
Index=[0,1] (x,y)=(-38,76))
Index=[0,2] (x,y)=(0,76)
Index=[0,3](x,y)=(38,76)
Index=[1,0] (x,y)=(-76,38)
Index=[1,1] (x,y)=(-38,38)
Index=[1,2] (x,y)=(0,38)
Index=[1,3] (x,y)=(38,38)
Index=[2,0] (x,y)=(-76,0)
Index=[2,1] (x,y)=(-38,0)
Index=[2,2] (x,y)=(0,0)
Index=[2,3] (x,y)=(38,0)
Index=[3,0] (x,y)=(-76,-38)
Index=[3,1] (x,y)=(-38,-38)
Index=[3,2] (x,y)=(0,-38)
Index=[3,3] (x,y)=(38,38)
Tomorrow, I will post my code because my file is broken and I can only retrieve from my workplace. Please help me.
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Explain your problem properly.
"I have written a 3 by 3 matrix program where I assume that the matrix represents the circle"
What circle? How does a Matrix represent a circle?
"It is able to tell the coordinates of the axes as well as the origin."
Who is able to tell the coordinate of what?
"The program will find the origin automatically by taking the 3 minus by 1 then divide by 2."
3 what? 1 what?
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public class User{
public int UserID {get;set;}
public string Username {get;set;}
publict override bool Equals(object obj)
{
if(!(obj is User)) return false;
return (obj as User).UserID == UserID;
}
public override int GetHashCode()
{
return UserID;
}
public override ToString()
{
return Username;
}
}
base on the code above, when i create to object from the database, comparing them will return false even they are the same.
example:
User u1 = new User(){UserID = 1, Username = "FirstUser"};
User u2 = new User(){UserID = 1, Username = "FirstUser"};
var b = u1 == u2;
variable b is false;
I thought they will be the same,
is there i missing there?
I will appreciate for any advice will be given
Thank you.
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You need to override the == and != operators.
public static bool operator ==(User lhs, User rhs)
{
if(lhs == null && rhs == null) return true;
if(lhs == null && rhs != null) return false;
if(lhs != null && rhs == null) return false;
return lhs.UserID == rhs.UserID;
}
public static bool operator !=(User lhs, User rhs)
{
return !(lhs == rhs);
}
Just insert these into the class and you will be able to use == and != to check for equality and inequality.
Note that if you override one, C# forces you to override the other.
There are several other operators you can override. You can get all the nitty gritty details on MSDN[^].
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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thank you for the quick reply.
I thought overriding equals will be enough,
By the way, one more question base on the code above, which is most efficient using the "Equals" method or the equals operator?
Thank you
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As you're dealing with a class, not a struct, you can simplify the operator to:
public static bool operator ==(User lhs, User rhs)
{
return Equals(lhs, rhs);
}
public static bool operator !=(User lhs, User rhs)
{
return !Equals(lhs, rhs);
}
The static Equals method[^] will perform the null checks for you, and then call the instance Equals method on the first parameter:
public static bool Equals(Object objA, Object objB)
{
if (objA==objB) {
return true;
}
if (objA==null || objB==null) {
return false;
}
return objA.Equals(objB);
}
At first glance, it might look like the first line of that method would cause a stack overflow, since your == operator is calling a method that calls the == operator. However, within the Equals method, it's calling the == operator on the Object type, which just tests for reference equality.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you, for all the hint, i finally got it now
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You might also want to check for null being passed in to the Equals method.
i.e. insert the following line into the beginning of the method:
if(other == null) return false;
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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Hi,
I have an application which is built on .net 2.0 framework. I am looking for command to execute powershell command from c#.
Ex: in Powershell command prompt, we need to type "Install-WindowsFeature XPS-viewer" to enable XPS viewer.
I am looking for C# code to do this. I don't want to use script file.
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Hello, I am new in this forum and this time I need your friendly help:
my problem is, that this exception appears when "pathName" is an UNC path name.
public Boolean CheckPathName(string pathName,
FileSystemRights rights,
AccessControlType type)
{
Boolean ok = false;
try
{
_accountName = System.Environment.UserDomainName +
'\\' + System.Environment.UserName;
if (Directory.Exists(pathName))
{
AddDirectorySecurity(pathName, _accountName, rights, type);
ok = true;
}
}
catch (InvalidOperationException ex)
{
throw ex;
}
return ok;
}
public static void AddDirectorySecurity(string FileName, string Account, FileSystemRights Rights, AccessControlType ControlType)
{
DirectoryInfo dInfo = new DirectoryInfo(FileName);
DirectorySecurity dSecurity = dInfo.GetAccessControl();
dSecurity.AddAccessRule(new FileSystemAccessRule(Account, Rights, ControlType));
dInfo.SetAccessControl(dSecurity);
}
can someone help me?
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Don't use throw ex; - it destroys the stack trace, and makes it harder to diagnose the problem.
Either use throw; to rethrow the exception, or remove the try...catch block altogether.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hi Richard,
thank you for your reply.
I changed the code, but result is the same.
try
{
_accountName = System.Environment.UserDomainName +
'\\' + System.Environment.UserName;
if (Directory.Exists(pathName))
{
AddDirectorySecurity(pathName, _accountName, rights, type);
ok = true;
}
}
catch (InvalidOperationException ex)
{
throw;
}
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I am developing an window form application, in which i am playing an audio of wave format, and want to convert that pre recorded speech or audio into text format(using speech api) and display that text in the label.
I started a thread for audio to text conversion in the play button, now i want to pause that thread on the pause button(means how to pause a that thread). I used ManualEventReset method. but in the pause button when i am using signal.waitone() methods. this freez the whole form. please help.some parts of my code is given here.
//pause button
ManualResetEvent signal = new ManualResetEvent(false);
ManualResetEvent signal = new ManualResetEvent(false);
private void buttonX15_Click(object sender, EventArgs e)
{
method_pause();
}
public void method_pause()
{
clip.Pause();
visular1.Stop();
visular2.Stop();
visular3.Stop();
visular4.Stop();
visular5.Stop();
this.pause.Hide();
signal.WaitOne();
play.Show();
}
private void play_Click(object sender, EventArgs e)
{
playsub();
labelX1.Text = "Play";
}
public void playsub()
{
starter = delegate { subt(FName); };
thread=new Thread(starter);
try
{
thread.Start();
method_play();
}
catch(Exception ex){}
}
from where i can set the thread.
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You haven't posted all your code and it looks, to me, that you are starting the video through your method_play method, which is happening on the primary thread.
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picture 1
picture 2
I made method for checking if all pieces are in base or goal if yes it returns true,now i need another method.
If pieces are ordered like on Picture 1. i need to change number of throws to 3 ,if pieces are ordered like on Picture 2 i can allow only 1 throw cos of empty space between.
I got 4 goalPositions and 4 piecePositions,and need to check if pieces are ordered on them from 54-51 path positions(path is array of 55 fields 0-54) ,if yes return true if not return false.
I am new to C# never had chance to work with order checking till now.
I was trying to do it with 3 int lists goalPositions (populated with 51,52,53,54 path positions),piecePositions(populated with pieces positions with getPosition()),and piecesOnGoal. but no luck with that.
ill add some code. part of player class with that lists and method for checking pieces in goal or base
class Player
{
protected PieceSet[] pieces;
Color color;
int numberOfThrows;
Dice dice;
public List<int> goalPositions;
public List<int> piecePositions;
public List<int> piecesOnGoal;
public enum Color
{
Yellow, Green, Blue, Red
}
public Player(Color color)
{
int[] path = new int[55];
this.color = color;
dice = new Dice();
numberOfThrows = 3;
switch (color)
{
case Color.Yellow:
path = BoardHelper.getYellowPath();
break;
case Color.Green:
path = BoardHelper.getGreenPath();
break;
case Color.Blue:
path = BoardHelper.getBluePath();
break;
case Color.Red:
path = BoardHelper.getRedPath();
break;
}
pieces = new PieceSet[4];
pieces[0] = new PieceSet(path, 0);
pieces[1] = new PieceSet(path, 1);
pieces[2] = new PieceSet(path, 2);
pieces[3] = new PieceSet(path, 3);
piecePositions = new List<int>(4);
piecePositions.Add(pieces[0].getPosition());
piecePositions.Add(pieces[1].getPosition());
piecePositions.Add(pieces[2].getPosition());
piecePositions.Add(pieces[3].getPosition());
goalPositions = new List<int>(4);
goalPositions.Add(51);
goalPositions.Add(52);
goalPositions.Add(53);
goalPositions.Add(54);
piecesOnGoal= new list<int>();
}
public bool isAllPiecesInBaseOrGoal()
{
if ((pieces[0].getPosition() < 4 || pieces[0].getPosition() > 50) &&
(pieces[1].getPosition() < 4 || pieces[1].getPosition() > 50) &&
(pieces[2].getPosition() < 4 || pieces[2].getPosition() > 50) &&
(pieces[3].getPosition() < 4 || pieces[3].getPosition() > 50))
return true;
else
return false;
}
and this is how i was thinking to solve my problem ,check if goalPositions contains piecePositions if yes add that position into piecesOnGoal ...now i need somehow to check are that piecesOnGoal are ordered if yes return true if not false.
I am open for any suggestion.
public bool isAllPiecesAreOrderedInGoal()
{
for (int i = 0; i < 4; i++)
{
if (goalPositions.Contains(piecePositions[i]))
{
piecesOnGoal.Add(piecePositions[i]);
}
}
}
Any help is appreciated.
Its kind of urgent.
Thank you in advance.
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