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You make a very good point.
KOM UIT DAAAAA!!!
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How to compare two dataTables in C#.
I have this code but it returns NULL.
DataTable dtReturn = new DataTable();
dtTarget.Merge(dtSource);
BindingContext[dtTarget].EndCurrentEdit();
dtReturn = new DataTable();
dtReturn = dtTarget.GetChanges(DataRowState.Added);
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From what I read here[^], you need to switch the DataTable for the Merge function.
Try this:
dtSource.Merge(dtTarget);
DataTable dtReturn = dtTarget.GetChanges();
0100000101101110011001000111001011101001
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Thanks for ans !
But even i have try this and returns NULL values too.
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I just read this Comparing Datasets using Linq[^] and it states that
To resolve this issue we contacted the Microsoft Support team and after a few days of email exchange, we got the following message: ”I think the root of the issue is that Merge does not change row state. If you create a dataset, then manually change a row value, then row state is tweaked and GetChanges() behaves as expected.”
so it looks like the merge option is not going to work.
Perhaps you can use the LINQ option given.
0100000101101110011001000111001011101001
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Hi,
I need some help for solving the following problem.
I got an event in C# an registered some methods to the event. I can fire them by calling the event with MyEvent().
eventDo += TestFkt;
eventDo();
It works fine.
The problem is the 'outsourcing' of the eventcall.
I want to register the methods to an event in C# but the event is fired within a C++ DLL with the command
SetEvent(HANDLE hEvent)
I can pass the hEvent via a DLL-call to the C++ code:
[DllImport("canapi2.dll", EntryPoint="CAN_SetClientParam")]
public static extern uint SetClientParam(
ushort wParam,
int dwValue);
The Method in the C++-Code to set the HANDLE hEvent
CAN_SetClientParam(
WORD wParam, DWORD dwValue);
In the C++-Code of the CAN-driver
SetEvent((HANDLE) dwValue)
is called while receiving CAN-Messages. With this call I want to inform the C#-Application.
Get anyone an idea, how to - let's say 'extract' - the Handle from the C#-event and pass it through the DLL?
Following code snippet doesn't work:
IntPtr iptr = Marshal.GetFunctionPointerForDelegate(eventDo);
SetClientParam(PARAM_ONRCV_EVENT_HANDLE, (int)(iptr));
Thanks for answering!
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Firstly, if you have control over the C++ code, I would change the last parameter to a pointer type
CAN_SetClientParam(
WORD wParam, DWORD dwValue);
as it will work on a 32 bit system (DWORD is 32 bits) but possibly fail on a 64 bit system where a handle/pointer is 64 bits.
If I understand correctly, the C++ code calls the callback and you want to raise an event in C# on that callback?
That is quite easily done by creating a delegate with the correct signature for the C++ callback and just passing that directly in your C# prototype instead of marshalling. The function that the delegate points to can then raise an event as normal. Something like this (untested, written without an IDE so may have small errors!)
internal delegate void YourDelegate();
internal static class NativeMethods
{
[DllImport("canapi2.dll", EntryPoint="CAN_SetClientParam")]
public static extern uint SetClientParam(
ushort wParam,
YourDelegate dwValue);
}
public class YourWrapper
{
public event EventHandler YourEvent;
private YourDelegate yourDelegate;
private uint lastCallbackResult;
public YourWrapper()
{
yourDelegate = new YourDelegate(OnYourDelegate);
}
public uint LastCallbackResult
{
get{ return lastCallbackResult; }
}
public void CallUnmanaged(ushort wParam)
{
lastCallbackResult = NativeMethods.SetClientParam(wParam, yourDelegate);
}
private void OnYourDelegate()
{
OnYourEvent(EventArgs.Empty);
}
protected virtual void OnYourEvent(EventArgs e)
{
EventHandler eh = YourEvent;
if(eh != null)
eh(this, e);
}
}
You may need to change parameters, return types and possibly a custom EventArgs derived class to pass any data that is required from the callback, but the basic layout will be the same.
CallUnmanaged(); will trigger the C#/C++ interop and fire any handlers you attach to YourEvent, the callback result will be available in LastCallbackResult (I would move this to a custom event args rather that caching the value).
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Do you got an idea why th applicatoin jumps never into OnYourDelegate after calling the SetEvent(..) in the DLL?
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// C++ code:
BOOL manualReset = false;
HANDLE theEvent = CreateEvent(NULL, manualReset, false, _T("TheEvent"));
...
SetEvent(theEvent);
...
// C# code:
event EventHandler theEventTriggered;
...
theEventTriggered += SomeHandler;
...
EventWaitHandle theEvent = EventWaitHandle.OpenExisting("TheEvent");
theEvent.waitOne();
if (theEventTriggered != null)
{
theEventTriggered();
}
Note the C++ code must execute before the C# code that creates the event handle.
If it's the other way around, then simply use
new EventWaitHandle(false, EventResetMode.AutoReset, "TheEvent"); instead of
EventWaitHandle.OpenExisting("TheEvent");
If your actions inspire others to dream more, learn more, do more and become more, you are a leader." - John Quincy Adams
You must accept one of two basic premises: Either we are alone in the universe, or we are not alone in the universe. And either way, the implications are staggering” - Wernher von Braun
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Thanks for the both answers!
@Dave
Your proposal and your code syntax ist just right! Compiles without any error and it hits my problem.
But in jumps never into OnYourDelegate after calling SetEvent(..) in the DLL.
@Ahmed
Is works fine, but if I did correctly understand, there's has to be a thread permenently running in the background to check up the call of the event!? When the event in the DLL raises, my own event 'theEventTriggered' is called from the thread.
It works fine, but I want to raise the Event in the C# code like an interrupt out of the DLL. Without permanently checking in a own thread. You see a possibility there?
I thought, I can give the DLL the adress of my C# event oder delegate. So, when the event in the DLL is fired, my event in C# is also fired. Like in the following way:
[DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Auto)]
public static extern IntPtr CreateEvent
(
IntPtr lpEventAttributes,
bool bManualReset,
bool bIntialState,
string lpName
);
public delegate void DoHandler();
public void Foo()
{
IntPtr EventsAdress = CreateEvent(IntPtr.Zero, false, false, "TheEvent");
DoHandler doH = new DoHandler(MethodForEventAction);
doH = (DoHandler)Marshal.GetDelegateForFunctionPointer(EventsAdress, typeof(DoHandler));
SetClientParam(wParam, EventsAdress );
}
public void MethodForEventAction()
{
Console.WriteLine("Event from DLL raised.");
}
SetEvent(EventsAdress);
Thanks for your input! Your suggestions are very useful. Do you got any idea about my second post?
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Yes, you are correct that there needs to be a thread in the C# code waiting on the native kernel event to be triggered. That thread would then trigger the C# event or call the C# method. Note that the event or method would run in the context of the waiting thread.
You don't need to pass the event handle over to the C++ code or DLL. You just need to call CreatEvent with the same parameters and it will get a handle to the same event. Events created with CreateEvent are global to the system, and potentially accessible from any process.
If your actions inspire others to dream more, learn more, do more and become more, you are a leader." - John Quincy Adams
You must accept one of two basic premises: Either we are alone in the universe, or we are not alone in the universe. And either way, the implications are staggering” - Wernher von Braun
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Thank you very much. It works. 
IntPtr MsgReceivedEvent
MsgReceivedEvent = CreateEvent(IntPtr.Zero, false, false, "RcvEvent");
startRcv((uint)MsgReceivedEvent);
EventWaitHandle theEvent = EventWaitHandle.OpenExisting("RcvEvent");
while (!PendingCancel)
{
if (theEvent.WaitOne(5000))
{
Log("EVENT RAISED!");
}
}
SetEvent(MsgReceivedEvent);
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Excellent! Glad I could be of help!
If your actions inspire others to dream more, learn more, do more and become more, you are a leader." - John Quincy Adams
You must accept one of two basic premises: Either we are alone in the universe, or we are not alone in the universe. And either way, the implications are staggering” - Wernher von Braun
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Hi
I want to highlight or more like select all the occurrences of a word. But I have googled a lot and haven't found anything about that.
When I have tried, it just selects one appearance of the word, the last.
Word.Application ap = new Word.Application();
doc = ap.Documents.Open(path, ReadOnly: false, Visible: true);
ap.Selection.Find.ClearFormatting();
ap.Selection.Find.Text = txtFind.Text;
ap.Selection.Find.Execute();
while (ap.Selection.Find.Found)
{
ap.Selection.Select();
ap.Selection.Find.Execute();
}
doc.Activate();
ap.Visible = true;
ap.ActiveWindow.SetFocus();
I have tried so many different approaches, but haven't been able to solve it.
I don't want to highlight the words, I just want them to be selected as they are when you choose find all in Microft Word.
Hope somebody can help me.
Many thanks
Fia
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You are missing some properties for your Selection.Find list. Try setting Forward = true and Wrap = wdFindContinue. To find these values, you can use the macro recorder in Word and perform a Find all operation - this should give you a good place to start.
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Hi
Thanks for your reply, but I have already tried that, but nothing changes. It just selects the last occurrence of the word. I really don't want to use a macro. Aren't there another way to accomplish this.
Many thanks
Fia
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Use the macro to tell you what options to set, not to actually run the find.
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Hi
Thank you, that was smart. But when I record a macro that does what I want and later tries to run the macro nothing happens. I don't understand why?
Do you have anymore suggestions.
Many thanks
Fia
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fiaolle wrote: It just selects the last occurrence of the word.
May be you have to set MultiSelect = true somewhere in your code. Just a suggestion though, I haven't done Word automation so far.
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Repeating what was already said....
1. Create a macro that does what you want.
2. LOOK at the macro. Figure out what it is doing.
3. Use the information that you LEARNed in 2 to create your C# code.
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Hi
I have already tried that but it doesn't work. I have no idea how to solve this. If anyone knows please help.
Thanks
Fia
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Is there a way to run nunit Test class 50 times in a loop ?
For example I have a class like
[TestFixture]
public class DemoFailureTeste
Can I run it 50 times successively ?
modified 10-Oct-11 7:11am.
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Of course you can. Just move the code that you want testing into a for loop. I would probably move it into a method on its own and just call that from the loop if I were you.
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But it will recall the methods only , right ? I need to reload the class itself  .Any idea ?
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What are you trying to achieve? There is no inbuilt way to run the tests n times, so you'd end up having to code for this yourself.
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