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Try
<br />
string temp = Object.GetType().ToString();<br />
switch(temp)<br />
{<br />
case "typeA":<br />
break;<br />
case "typeB":<br />
break;<br />
default:<br />
break;<br />
}<br />
Kev Pearman MCP
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Or, the best way is to use visitor pattern (http://www.dofactory.com/Patterns/PatternVisitor.aspx), especially if you cast your objects after doing "is".
if (obj is MyType)
{
objOfMyType = (MyType)obj;
...
}
The visitor pattern will get rid of casts, and allow you to create new classes and not having to add if (obj is MyNewType) or case statements.
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I am trying to develope a small RTF writer to generate project report at runtime, with a limited RTF writing capability. RTF is one page document only, untill we intentionally put page breaks in it and Project report consists of number of pages. Thus, on what criteria it should be decided to insert page break? How to keep track of page's empty area before inserting anything?
Please guide.
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Yes some information is given under 'Page Information', but is there some way to identify exactly how many characters I can print before I run out of room in the current rectangle that defines the output, and go to a new page. There is no real-time example 
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Is this correct ? : (if i inherit this class)
<br />
Public MustInherit Class Singleton(Of T)<br />
Private Shared Instance As T<br />
Private Shared Created As Boolean<br />
<br />
Public Shared Function GetInstance() As T<br />
If Not Created Then<br />
Instance = Activator.CreateInstance(GetType(T), True)<br />
Created = True<br />
End If<br />
Return Instance<br />
End Function<br />
<br />
Public Overrides Function ToString() As String<br />
Return "Instancia única de " & GetType(T).ToString<br />
End Function<br />
<br />
End Class<br />
P.D.:I know it is not C# but right now i don't have generics-enabled C# right here.
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Here is a singleton in C#:
public sealed class SqlManager
{
private SqlManager(){}
private static SqlManager instance;
private static object syncRoot = new Object();
public static SqlManager Instance
{
get
{
if(SqlManager.instance == null)
{
lock(syncRoot)
{
if(SqlManager.instance == null)
{
SqlManager mgr = new SqlManager();
System.Threading.Thread.MemoryBarrier();
SqlManager.instance = mgr;
}
}
}
return SqlManager.instance;
}
}
}
- Nick Parker
My Blog | My Articles
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The request failed with HTTP status 401: Unauthorized.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
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I have a problem when displaying a report that have more than 1 page.
When I click on "next page" button in crystal report toolbar, the page cannot be shown .
and, now my code is look like this :
rpt.SetDataSource(dataSet21);
CrystalReportViewer1.ReportSource = rpt;
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Have you placed the special field "Page N of M" on your report?
This should force the report to load all pages on startup. Otherwise it tries to load the pages dynamically (as far as I know).
Don't know if this could solve your problem, but maybe you'll give it a try...
-------------------------------------------
The light at the end of the tunnel has been switched off temporarily due to budget problems...
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Hi, I'm looking for a free menu/toolbar library (ideally with rebar/coolbar support ala IE6; Windows XP support would be icing). My target environment is an Explorer Bar, where top-level menus don't exist because they're not Windows applications, but I need a menu anyway. I've tried using the WinForms.ToolBar class as well as Lutz Roeder's CommandBar library. Both have flaws, perhaps a shared flaw in the WinForms.CommonDialog class clashing with the WinForms.Button class in this environment.
Anyhow, it seems that the relevant articles on this site don't seem to meet my criteria, and I'd like a free library (free as in beer, although source code would be nice, too). Nothing necessarily too fancy, although icon support and font/color customization of the text would be helpful.
By the way, does anyone know of a good repository of open-source .NET libraries and such besides this site? I know of WindowsForms.net and GotDotNet. They're okay.
Thanks!
Arun
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If you're willing to wait couple months (or use beta software) .net framework 2.0 will have those.
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I'm trying to create a C# class with functionality similar to the one from this article:
http://www.codeproject.com/cpp/enumleafclasses.asp
The only problem I have encountered is that under my design an instance of the leaf class must be created before the class will registered itself. This is not so with the code from the article.
How can I have a leaf class register itself with its base class without needing to create an instance of the leaf class?
The base class has the following member of my class defined:
protected static LeafFactory _LF = new LeafFactory(Type.GetType("LeafFactory_dev.BaseClass"));
And this is how I currently register the leaf class in its constructor:
BaseClass._LF.RegisterLeaf(this.GetType(), "description here");
-- K
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I was checking out Ianier Munoz's implementation of streaming audio input using the DirectSound API and C# .NET. My question has to do with a problem I'm facing in C#.
The function I want to access is declared as follows:
[c]
public void Play(nsStreamPlayer.PullAudioCallback pullAudio)
{
// Bunch of stuff
}
[/c]
nsStreamPlayer is a namespace in which a delegate and an interface are defined.
[c]
namespace nsStreamPlayer
{
///
/// Delegate used to fill in a buffer
///
public delegate void PullAudioCallback(IntPtr data, int count);
///
/// Audio player interface
///
public interface IAudioPlayer : IDisposable
{
int SamplingRate { get; }
int BitsPerSample { get; }
int Channels { get; }
int GetBufferedSize();
void Play(PullAudioCallback onAudioData);
void Stop();
}
}
[/c]
The "Play" function is defined in a nested private class
[c] private class PullStream : Stream [/c]
which itself belongs to a public class StreamingPlayer
[c] public class StreamingPlayer : IDisposable, nsStreamPlayer.IAudioPlayer [/c]
NOW: On my mainform designer I have a button called btnStartStream.
I want to write the code such that clicking btnStartStream calls the play function. How do I do this? Everything I've tried throws up an error message.
I know I'm missing something basic. Could you please help me out?
Thanks a lot for your time!
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You have an instance of the StreamingPlayer class, correct?
StreamingPlayer stmPlyr = new StreamingPlayer();
private void btnStartStream_Click(object sender, EventArgs e)
{
PullAudioCallback cbk = new PullAudioCallback(someAudioCallBack);
stmPlyr.Play(cbk);
}
private void someAudioCallBack(IntPtr data, int count)
{
}
- Nick Parker
My Blog | My Articles
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Nick, thanks for the reply! However, I still have a slight problem.
The constructor for StreamingPlayer needs three arguments - owner, DirectSound playback device and waveformat.
How do I include these in the function call? They are set in the function definition, i.e.
public StreamingPlayer(Control owner, Device device, WaveFormat format)
{
m_Device = device;
if (m_Device == null)
{
m_Device = new Device();
m_Device.SetCooperativeLevel(owner, CooperativeLevel.Normal);
m_OwnsDevice = true;
}
BufferDescription desc = new BufferDescription(format);
desc.BufferBytes = format.AverageBytesPerSecond;
desc.ControlVolume = true;
desc.GlobalFocus = true;
m_Buffer = new SecondaryBuffer(desc, m_Device);
m_BufferBytes = m_Buffer.Caps.BufferBytes;
m_Timer = new System.Timers.Timer(BytesToMs(m_BufferBytes) / 6);
m_Timer.Enabled = false;
m_Timer.Elapsed += new System.Timers.ElapsedEventHandler(Timer_Elapsed);
}
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Sorry, disregard that...that was a really dumb question. Been working on this too long...not thinking straight.
BUT:
PullAudioCallback is a delegate defined as
public delegate void PullAudioCallback(IntPtr data, int count);
When I instantiate a PullAudioCallback object,
PullAudioCallback cbk = new PullAudioCallback(...)
I need arguments for data and count. What should these be?
I tried digging through the source code but I don't see where he calls this function explicitly, though it is integral to the application.
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crushinghellhammer wrote:
I need arguments for data and count. What should these be?
It's a delegate which means that it's instance has to represent that signature it defines. Take a look at my example, the example function matches that method signature. Does that make sense?
- Nick Parker
My Blog | My Articles
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I see now! Sorry if this is exasperating...I'm new to C# and sometimes reading other people's code (in this case Ianier's) is a little confusing.
My understanding of his intention in using PullAudioCallback is that the delegate is supposed to wait for count bytes to be copied to the data buffer which is an IntPtr before it plays these bytes.
What exactly is IntPtr...is it a pointer to a byte array? What would the contents of
"someAudioCallBack(IntPtr data, int count" be?
Thanks again!
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If i have a FileSteam and open a BinaryReader on it the FileStream is Closed/Disposed when I close the Binaryreader - does it work the other way around? Does calling Close on the FileStream call Close/Dispose on the BinaryReader?
Rugby League: The Greatest Game Of All.
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PaleyX wrote:
Does calling Close on the FileStream call Close/Dispose on the BinaryReader?
No, you should not do that. Internally, the BinaryReader uses a reference to the FileStream instance. Because the BinaryReader implements IDisposable, you can wrap the BinaryReader in a using statement so try/finally blocks are emited and the BinaryReader is cast to an IDisposable and the Dispose() method is called.
- Nick Parker
My Blog | My Articles
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i am student ,and i want to work on some telephony application
i know that the perfect subject is TAPI ,but there are some questions :-
1- can i use the TAPI in c# language ?
2- should i install some files or dll files that help to execute TAPI functionallity ?
3-couild i have an example in c# that shows me how exactly work with TAPI in c#?
finally ,forgive me for my bad english?
 >
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Wail A.Salem wrote:
can i use the TAPI in c# language ?
Yes, but you will have to P/Invoke your method calls because they are native. If you are unfamiliar with this process you can find more information here[^]. Take a look at the TAPI.H file to see what's available to you.
- Nick Parker
My Blog | My Articles
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