C# Discussion Boards - CodeProject

Re: Creating Minidumps After Error

17-Jul-12 11:19

Compare your version of the code to this one[^]. The article also states what happens when you reach the exception-handler, and what's on the stack at that moment.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Richard Andrew x6417-Jul-12 12:29

Richard Andrew x64

17-Jul-12 12:29

Thanks. That looks like a good link.

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...the impossible takes slightly longer.

insert data from Oracle to MS SQL

Ubun2OS17-Jul-12 5:57

Ubun2OS

17-Jul-12 5:57

i want insert data from ORA to SQL 2000. and i would like use any Data Component for this idea. is possible to read from ora and insert read data to my table in SQL?

whats your idea?

Pete O'Hanlon17-Jul-12 6:09

17-Jul-12 6:09

Ubun2OS wrote:
is possible to read from ora and insert read data to my table in SQL?

Yes. A simple way is to have a class to read data from Oracle (so you'll be using the Oracle data commands) and another one to write data into Sql Server (so you'll be using the Sql Server commands). Simply implement a model class to hold your data - and fill this from the Oracle one and pass it into the Sql Server one to perform the update.

Or, you could get SQL Server to do this all for you simply by writing a transformation with your Oracle database as the source of the data.

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PIEBALDconsult17-Jul-12 6:41

PIEBALDconsult

17-Jul-12 6:41

Of course. Currently I'm doing some of that with SSIS, but my personal preference is to use ADO.net.

0) Don't use the classes in System.Data.OracleClient[^]

1) If using ADO.net, use the classes in Oracle Data Provider for .NET[^]

2) If using SSIS, use the components in the Microsoft Connector for Oracle by Attunity with SQL Server 2008 Integration Services[^] (Microsoft turned us onto this.)

3) I understand you could also link the servers and just use an INSERT/SELECT statement, but I haven't tried that.

Edit: I see you said SQL 2000, but I hope the above would work anyway.

Pete O'Hanlon17-Jul-12 8:07

17-Jul-12 8:07

Have a 5 from me. BTW - with SQL 2000, it's DTS not SSIS.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

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Creating subobjects within an object?

PIEBALDconsult17-Jul-12 9:27

PIEBALDconsult

17-Jul-12 9:27

Pete O'Hanlon wrote:
with SQL 2000, it's DTS not SSIS.

Yes, but I assume that SSIS will work with instances of SQL Server 2000 -- it's just ADO.net underneath.

Goalie3517-Jul-12 5:43

Goalie35

17-Jul-12 5:43

Ok, I'm sure this is a simple question but how would I create subobjects within an object?

I want to create an object that lists the "status" of my application, to determine if it ran ok or not.

So I want to have validation code like the following:

Status status = RunReport();
if(status.Exception)  //boolean
{
     string exceptionMessage = status.Exception.Message;
     string stackTrace = status.Exception.StackTrace;
}

Or....perhaps this:

Status status = RunReport();
if(status.Success)  //boolean
{
    //Ran ok.  Hooray!!!
}

So my question is, how could I setup my "Status" object to have examples like the following:
Status.Success (boolean)
Status.Exception (boolean)
Status.Exception.Message (string)
Status.Exception.StackTrace (string)

Thanks.

Luc Pattyn17-Jul-12 6:40

Luc Pattyn

17-Jul-12 6:40

You can define your own Status type (class or struct). It could have whatever public fields (or better properties) you like.

You would instantiate such type like any other. Maybe so:

public Status RunReport() {
   ...
   Status status=new Status(true);
   return status;
}

However, seeing you are thinking "Exception", why not use real exceptions, i.e. return results when all goes well, and throw an Exception when something goes wrong, so the caller can catch that Exception?

Goalie35 wrote:
Status.Exception (boolean)

Status.Exception.Message (string)

That is not possible. Either Exception is a boolean and it hasn't subfields; or it is a composite type (with fields/properties Message, StackTrace, etc.) and then it doesn't have an overall boolean value.

I would suggest you return to your C# book and read the chapters on classes, and Exceptions.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

BobJanova18-Jul-12 4:38

BobJanova

18-Jul-12 4:38

It is actually possible (but note, OP, this is a flight of intellectual fancy and don't do this in real code):

class MyExceptionThing {
 public string Message { get; set; }
 public string StackTrace { get; set; }

 public static implicit operator bool(MyExceptionThing thing) { return Message != null; }
}

class Status {
 public MyExceptionThing Exception { get; private set; }
}

Custom implicit cast operators can cover a multitude of sins!

I too recommend that you do what Luc says here and expose an actual Exception (i.e. System.Exception, something that you can use throw on) if you want that information available in a status object. There is precedent for this in the Task Parallel Library and BackgroundWorker. Then you can check for

if(status.Exception != null){ ... }

Luc Pattyn18-Jul-12 5:22

Luc Pattyn

18-Jul-12 5:22

Thanks Bob. I didn't know that, however I never felt a need for it either. I don't think I'll ever use it...

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Compare Images "before and after"

TheGreatAndPowerfulOz9-Aug-12 4:26

TheGreatAndPowerfulOz

9-Aug-12 4:26

if you had a status object with an Exception field, then you'd test for an exception as follows:

if (status.Exception != null) // oops, something bad
{
...
}

alternatively, you could have a "computed" property Success as follows

public class Status
{
...
public Exception Exception { get; set; }
...
public bool Success { get { return Exception == null; } }
...
}

then use it as follows:

if (status.Success) // cool, all good!
{
...
}

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ToBick16-Jul-12 22:03

ToBick

16-Jul-12 22:03

Hello,

do you know (i didn't find anything also i spent quite some time looking) if any .net control is available to compare pictures like it is done with the following Flash-Control:

http://activeden.net/item/flexible-image-compare-before-after/full_screen_preview/121018[^]

If not - how would you realize this in C#?

Thanks a lot for any help!

BR
Tobias

Eddy Vluggen16-Jul-12 23:13

16-Jul-12 23:13

ToBick wrote:
if any .net control is available to compare pictures like it is done with the following Flash-Control:

Your example shows two pictures side by side. I do not see a "comparison".

ToBick wrote:
If not - how would you realize this in C#?

I'd load two images in two panels.

Please explain a bit more what needs be compared (picture size, colors, what?), who should do the comparison (the computer, or the user? Your example implies that the user is going to compare them by looking at them) and what the result should be like.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

ToBick17-Jul-12 4:47

ToBick

17-Jul-12 4:47

Hi,

what i'd like to do is shown also in the following link:

http://www.spiegel.de/panorama/vorher-nachher-grafik-so-verheerend-war-der-tsunami-a-750653.html[^]

Basically, i want to put two pictures above each other and have a "slider" which i can move with the mouse to the left or the right - the part left to the slider belongs to picture No. 1 and the part right to the slider belongs to picture No. 2

Thereby, i can compare a picture which shows the same object before and after a modification.

Eddy Vluggen17-Jul-12 4:53

17-Jul-12 4:53

A SplitContainer[^] control. Drop two Panels onto it, and draw the appropriate part of the image manually.

--that would assume WinForms, not WPF or web; what UI are you targetting?

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

ToBick17-Jul-12 6:57

ToBick

17-Jul-12 6:57

Winforms - so i'll try it like that. However i'm not sure if the width of the split-container slider is not a little bit too high - what do you think how the performance would be (size of both pictures is < 100kb) if i just use one picture box in which i draw the picture depending on the mouse position - i could also just create a line from bottom to top at where the mouse pointer is to seperate it + show an icon as a handle...

Eddy Vluggen17-Jul-12 7:52

17-Jul-12 7:52

I think performance will largely depend on the bitmaps used, their dimensions and their depth. I think the performance would be quite well, it's not a very heavy task cpu-wise.

The width of the slider can be set using a property, and a PictureBox doesn't add much over a Panel. You'd still have to draw it yourself, and, after a mousemove, invalidate and repaint the affected part - not the entire bitmap.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Pete O'Hanlon17-Jul-12 8:23

17-Jul-12 8:23

Your biggest performance hit will come with the algorithm that you use to generate the "after" image. That's where most of the computation will occur.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

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Returning Instance Issue - Object Reference Not Set

Abhinav S16-Jul-12 23:15

Abhinav S

16-Jul-12 23:15

There is no direct API available for this.
However, some articles like this[^] could come to your aid - do a search on the internet and you will find more blogs that could help you.

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AmbiguousName16-Jul-12 22:00

AmbiguousName

16-Jul-12 22:00

Hello there. I have a class which is designed to have only one instance. I instantiate this class in the main dialog. Then in one of my tabs, I try to get this class' object but it stated

Object reference not set to an Instance of an object

Here is what I am trying to far.

public class SingleClass  // designed to have one object only
{
  public SingleClass SingleObj {get;set;} 
  public MainDlg MainDlgObj {get;set;}

  public SingleClass(ref MainDlg main)
  {
    SingleObj = this;
    MainDlgObj = main;
  }
}

public class MainDlg
{
  SingleClass sc;
  public MainDlg()
  {
    var MainDlgObj = this;
    sc = new SingleClass(ref MainDlgObj);  // Instantiating SinegleClass here
  }

  public void ShowMessage()
  {
    MessageBox.Show("Hello From MainDlg");
  }
}

Now in one of my tabs in this main dialog, I am trying to call this ShowMessage() method via SingleClass like this but it gives the said error

public class Tab1
{
  SingleClass sc;
  public void Function_InTab()
  {
    // here i want ShowMessage in MainDlg
    sc.SingleObj.MainDlgObj.ShowMessage();
  }
}

The code compiles well but it fails at runtime with the said error. How can I show ShowMessage() here? Thanks for any input.

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Re: Returning Instance Issue - Object Reference Not Set

Pete O'Hanlon16-Jul-12 22:16

Re: Returning Instance Issue - Object Reference Not Set

16-Jul-12 22:16

Without using static, your classes here must be instantiated. I must say though, that your hierarchy is a complete mess. You need to do a rewrite of this - you might possibly want to consider something like this:

public interface IMessage
{
  void ShowMesage();
}
public class MainDialog : IMessage
{
  public MainDialog() {}
  public void ShowMessage()
  {
    MessageBox.Show("Hello");
  }
}

public static class SingleObj
{
  public static void ShowMessage<T>() where T : IMessage, new()
  {
    T dialog = new T();
    dialog.ShowMessage();
  }
}

public class Tab1
{
  public void Function_InTab()
  {
    SingleObj.ShowMessage<MainDialog>();
  }
}

In this code sample, you can see the use of the static modifier to make ShowMessage single instance. More importantly, you can see that we have used generics with constraints to get a somewhat more pleasing design for the case where we simply want to show a message. You can extend and adapt this as to cater for more complex designs, but bear in mind that a single instance class can often be considered to be a code smell - make sure you use it wisely.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Eddy Vluggen16-Jul-12 23:16