C# Discussion Boards - CodeProject

Richard MacCutchan11-Jun-14 21:45

Richard MacCutchan

11-Jun-14 21:45

This is just a question of reading each line of the file and taking a different path based on the content of each line, as you have described above. Something like:

WHILE NOT EOF
BEGIN
    READ nextline
    IF nextline == singleinteger THEN COPY nextline to Column1
    ELSEIF nextline.CONTAINS("-->") 
    BEGIN
        CALL processDateFields
        WHILE TRUE
        BEGIN
            READ nextline
            IF nextline == BLANK THEN BREAK
            APPEND nextline to Column4
        END
        ADD ROW to GRID
    END
END

Obviously you will need to add some other tests for garbage data, repeated blanks etc., but this should give you a starting point.

ZinusMero15-Jun-14 15:19

ZinusMero

15-Jun-14 15:19

Thanks, this gives me more to think about

joost.versteegen11-Jun-14 21:50

joost.versteegen

11-Jun-14 21:50

I would create a class SubTitle with properties number, startTime, EndTime, etc. Then create an object SubTitle, fill the properties and add the object to a List<subtitle> collection, and so for all subtitles in the file. Finally, set the collection to be the datasource of the datagrid.

inline conditional asp.net c#

ZinusMero15-Jun-14 15:20

ZinusMero

15-Jun-14 15:20

I hadn't thought of that, I will add it to my testing. Thanks

greyhawk11-Jun-14 10:38

greyhawk

11-Jun-14 10:38

I have a label that is based on a conditional statement, however, the condition is not acting correctly, for instance knowing that the following should be true:

A==1?"First":A==2?"Second":"Final"

Given 1, you see "First"
Given 2, it shows "Final"
Given any other number it shows "Final"

I need it to show "Second"
Now you see the pseudo code, here is the actual code:

<asp:Label ID="lblActive" runat="server" Text='<%# Convert.ToInt32(Eval("Active"))==1?"Active":Convert.ToInt32(Eval("Active"))==2?"Exempt":"Inactive" %>'></asp:Label>

Why is it always showing "Inactive" when clearly the eval is 2 or 1, I expected all the 0's to be Inactive and they are, but all 1's are active and all 2's are showing "Inactive"

Re: inline conditional asp.net c#

OriginalGriff11-Jun-14 21:37

OriginalGriff

11-Jun-14 21:37

Your sample code works for me:

for (int A = 1; A < 4; A++)
    {
    Console.WriteLine(A == 1 ? "First" : A == 2 ? "Second" : "Final");
    }

Generates:

First
Second
Final

So I would suspect you need to look elsewhere in your code to identify what Eval("Active") is returning, and why.

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

Re: inline conditional asp.net c#

Swinkaran12-Jun-14 15:51

Swinkaran

12-Jun-14 15:51

The syntax is correct.

The reason is very simple. It is always showing "Inactive" because the Convert.ToInt32(Eval("Active"))may not have assigned a value. If you are reading this values from you class file. You need to check where you assign the value.

Explaining further, If you assign a value to the "Active" in or after Page_Load() event, that will not be reflected in your aspx page(unless you Rebind() the controls again). You need to consider the ASP.Net Page cycle and related events. The controls should be rendered and assigned in proper sequence.

Observer pattern for real time scenario

Suraj Rai11-Jun-14 8:52

Suraj Rai

11-Jun-14 8:52

Hi,

I have a imaging software where we display the images.
We have different tools called as parameters in the UI.

Few of the parameters are namely:

1. Colors
2. Image thickness
3. Change image informations and so on...

The color parameter is used to change the color of the image,
the image thickness parameter is used to change the thickness of the image,
the change image information tool is use to change the image information like name, date of scaned etc.

Requirement:

If user changes any of the parameter, we need to notify the user with a * in the UI saying
one of the parameter has changed.

Class Design:

I want to implement a observer design pattern using events existing in the parameter clases.

Question:

I read observer design pattern. I had seen it using without
events. And also the definition says that

It defines a one-to-many dependency between objects so that when one object changes state, all its dependents
are notified and updated automatically.

But in my case I have many object and in change of any object I have to notify one object. Its actually
not one to many but many to one relationship.

Can I use observer design pattern in this ?? Can you specify which class shoud have attach, detach and notify
and which class should have update ??

Any help would be highly appreciated.

Thanks.

Re: Observer pattern for real time scenario

Pete O'Hanlon11-Jun-14 10:04

11-Jun-14 10:04

The most obvious answer for me is that you should have the classes that contain these changing properties implement INotifyPropertyChanged event, and raise a PropertyChanged event when your properties change. Taking your example, suppose you had a class structure that looked a bit like this interface hierarchy:

public interface IImage
{
  Color Color { get; set; }
  Thickness Thickness { get; set; }
  IInformation Information { get; }
}
public interface IInformation
{
  DateTime Scanned { get; set; }
  string Details { get; set; }
}

Well, you would want to raise a property changed event for the Color, Thickness, Scanned and Details changes. Then, all you would need to do in the class that was listening to this was have a PropertyChanged subscriber for the IImage implementation and one listening to the PropertyChanged event of the IInformation. Something like this would do it:

private IImage _image = new ImageImplementation();
private SetupEventHanders()
{
  _image.PropertyChanged += MyPropertyChangedEventHandler;
  _image.Information.PropertyChanged += MyPropertyChangedEventHandler;
}

private void MyPropertyChangedEventHandler(object sender, PropertyChangedEventArgs e)
{
  IsDirty = true;
}

Okay, this is a relatively naive solution, but it should give you some ideas of where to start. If you want to go the full observable route, you'll want to look into using RX. You might get some ideas here[^].

abstract class

Member 1087879011-Jun-14 8:37

Member 10878790

11-Jun-14 8:37

I don't understand the perpose of using abstract in c#,we can't create instance of abstract class and we also not define the method so why we use this?what is special thing which we not do by normal class?plz help me

Pete O'Hanlon11-Jun-14 8:55

11-Jun-14 8:55

An abstract class must be inherited from to be usable. What this means is that it's possible to define certain functionality that is common in inherited classes, saving you from having to write it again. A common example, in WPF, is a base ViewModel class that implements INotifyPropertyChanged:

public abstract class BaseViewModel : INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;
  protected void RaisePropertyChanged(string property)
  {
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
    {
      handler(this, new PropertyChangedEventArgs(property));
    }
  }
}

Now, you're free to use this wherever you need:

public class MyViewModel : BaseViewModel
{
  private string _name;
  public string Name
  {
    get { return _name; }
    set
    {
      if (_name != value)
      {
        _name = value;
        RaisePropertyChanged("Name");
      ]
    }
  }
}

modified 11-Jun-14 15:18pm.

Richard Deeming11-Jun-14 9:15

Richard Deeming

11-Jun-14 9:15

Except you forgot to make BaseViewModel an abstract class! D'Oh! | :doh:

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Pete O'Hanlon11-Jun-14 9:18

11-Jun-14 9:18

Thanks

Showing timezone along with time

PIEBALDconsult11-Jun-14 9:43

PIEBALDconsult

11-Jun-14 9:43

Member 10878790 wrote:
we can't create instance of abstract class

That's why.

Some base classes can be used on their own, others can't -- if a base class is unusable by itself, and you don't want anyone to instantiate it, then mark it abstract. You don't have to (unless it contains abstract members), but it shows intent.

You'll never get very far if all you do is follow instructions.

nitin_ion11-Jun-14 7:59

nitin_ion

11-Jun-14 7:59

I am changing the timezone and want to display the zone like this 1/14/12 4:52:50 AM PST

with the code i am not able to get exactly the output that i want. How can i get time along wit PST in the end

var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(&quot;Pacific Standard Time&quot;);
               var offset = timeZoneInfo.GetUtcOffset(DateTime.Parse(newRX.Header.SentTimeOffset));
               var dto = new DateTimeOffset(DateTime.Parse(newRX.Header.SentTimeOffset), offset)

Re: Showing timezone along with time

Pete O'Hanlon11-Jun-14 9:09