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If the Form is going to show mostly text, I tend to create the structured parts by run-time code, i.e. code I write myself, as opposed to me doing repetitive sequences of point-and-click operations inside Visual Designer.
You could easily write a method that adds a Panel holding some TextBoxes/ListBoxes/TreeViews/whatever, positioning them, setting their Anchors/Docks, etc. Then call that method over and over.
Some advantages: it becomes easier to change your mind about layout details; and you could fetch the data from some external store (file, database, ...) and make it much more dynamic.
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Nah, it's not that much to do.
But I tested it now with a form that has many controls for data input and it works like a charm.
In the designer it's a huge form with all panels side by side for easy editing and the first thing I do when the form is constructed is change the size and hide all panels.
Then I display the appropriate panel when selecting a node and hide all others.
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Hi
i have created a media player i have problem in making 10 band equalizer using DirectX 9.0 in C# .net and also have a doubt that how to play .MP4 files.
I will be thankful if i get the solution.
Thank you,
NISHAd
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Solution to what? You haven't asked a question. Where exactly are you getting stuck? Describe the circumstances and what the problem is. Just saying "I have a problem with ..." doesn't tell us anything we can use to solve the problem.
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Maybe this[^] article will help.
Commercial product. 
/ravi
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Hi this is my code and it works fine when the XML document have a proper opening and Closing tag
XmlDocument objxmlDoc = new XmlDocument();
objxmlDoc.Load(txtFileName.Text);
Here txtFileName.Text refers to the physical path of the XML file
I am doing this to change the attributes of XML doc programatically .The above code snippet works fine for a proper XML doc.But it throws an exception for improper XML doc which misses closing tag. I need a code snippet/ suggestion to change the attribute of the XML doc even if it is invalid (missing close tags).
Thank u
Raghav
modified on Thursday, September 9, 2010 5:40 AM
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I think your question needs some clarification:
1. You have a non-valid XML document
2. You want to apply styles (whatever that means)
3. You want to use a C# winform
Please explain the connection between these three.
It's time for a new signature.
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Hi this is my code and it works fine when the XML document have a proper opening and Closing tag
XmlDocument objxmlDoc = new XmlDocument();
objxmlDoc.Load(txtFileName.Text);
Here txtFileName.Text refers to the physical path of the XML file
I am doing this to change the attributes of XML doc programatically .The above code snippet works fine for a proper XML doc.But it throws an exception for improper XML doc which misses closing tag. I need a code snippet/ suggestion to change the attribute of the XML doc even if it is invalid (missing close tags).
Thank u
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raghavsesh wrote: XML Document with missing closing tags
No you don't.
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Let's call it an XM Document, OK?
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as long as it moves in style, as that is what the OP asked for.
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Hi this is my code and it works fine when the XML document have a proper opening and Closing tag
XmlDocument objxmlDoc = new XmlDocument();
objxmlDoc.Load(txtFileName.Text);
Here txtFileName.Text refers to the physical path of the XML file
I am doing this to change the attributes of XML doc programatically .The above code snippet works fine for a proper XML doc.But it throws an exception for improper XML doc which misses closing tag. I need a code snippet/ suggestion to change the attribute of the XML doc even if it is invalid (missing close tags).
Thank u
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The Xml classes are designed to work with properly formatted XML documents. If it's not well formed then you are going to have to roll your own parsing functionality to cope with this - as the document is no longer XML, it's just fancily formatted text.
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Hey Raghav,
you're likely to have loads more issues down the line if the XML isn't correctly formatted, since most functionality will assume a valid document to avoid unexpected side effects.
A nasty hack around would be to try the Load method, then if that fails because of invalid XML, have some code called from the catch to open the document via a text reader and do a string replace on the tag name (e.g. string output = input.Replace("<mytag", "<mytag attribute='1'");). Other, better hacks also exist, but get pretty complex for something which is ultimately wrong though.
The better path is to throw an exception asking for a valid input / logging the bad data so that it can be fixed. The other option's to write code which attempts to work out what's wrong with the data and correct it automatically; though that's going to be complicated & could produce unexpected results.
If you can provide more information on what you're attempting (e.g. why is the XML invalid in the first place, is your app a service, or will there be a user interface allowing the user to see and correct exceptions, etc, the guys on here may be able to assist in recommending a better strategy.
Hope something in that lot helps.
JB
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Hello,
I have been struggling with some threading issues over the last couple of days. I am getting close to getting this thing to work but there are still a few niggles.
So, I have a thread that is called as follows and after the thread starts, my application shows a modal dialog box. So far so good:
t = new System.Threading.Thread
(delegate()
{
result = Init();
});
t.Start();
dialog.ShowDialog();
This works fine and there are no problems. Now, the user can hide this dialog box and when that happens the subsequent code gets executed as expected and this is not a problem. Also, I use ShowDialog(), so hiding or calling Close() should not call dispose as indicated in the docs.
Also, the dialog box is a singleton and lives for the duration of the application.
Now, my dialog box has a progress bar which gets updated by the calling thread and the update method that gets executed is as follows:
delegate void ProgressValueDelegate(int value);
public void SetProgressValue(int value)
{
if (this.InvokeRequired)
{
ProgressValueDelegate pvd = new ProgressValueDelegate(SetProgressValue);
this.Invoke(pvd, new object[] { value });
}
else
{
m_progressBar.Value = value;
}
}
So, as soon as the dialog box is hidden, the subsequent call crashes at the Invoke() call. I think there is some race condition going on somewhere because in the debugger the InvoleRequired value is fasle. However, the code has already entered the 'if' condition.
Does anyone know how I can handle this sort of situation?
Thanks,
Keith
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Object Disposed exception has nothing to do with Invoke Required. I would suggest checking to see if the progress bar has been disposed before assigning its value.
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Thanks for your reply. I did check all that and the IsDisposed property is false.
Here is the call stack
Object name: ProgressForm'.
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at ProgressForm.SetProgressDescription(String description)
at Mycomponent.UpdateProgressDialogDescription(String description)
at Mycomponent.Initialize(Int32 hashCode, Int32 numSeries, Int32[] nInstances)
at
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()</ExceptionString></Exception></TraceRecord>
An unhandled exception of type 'System.ObjectDisposedException' occurred in System.Windows.Forms.dll
<pre>
Cheers,
Keith
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at ProgressForm.SetProgressDescription(String description)
It appears to be calling SetProgressDescription and not SetProgressValue that you have included previously. Is this the issue?
WarePhreak
Programmers are tools to convert caffiene to code.
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Your code should read:
if (this.InvokeRequired)
{
ProgressValueDelegate pvd = new ProgressValueDelegate(SetProgressValue);
this.Invoke(pvd, new object[] { value });
return;
}
else
{
m_progressBar.Value = value;
}
I usually check to see if ISyncronizeInvoke is implemented and work on interface. This is how it would look:
ISyncronizeInvoke sync = (ISyncronizeInvoke)this;
if (sync != null)
{
if(sync.InvokeRequired)
{
ProgressValueDelegate pvd = new ProgressValueDelegate(SetProgressValue);
object[] args = { value };
sync.Invoke(pvd, args);
return;
}
else
{
m_progressBar.Value = value;
}
}
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Tried both and they fail.
It always fails at the Invoke() call.
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No, the value for the sync object is valid.
It goes into the loop and when it hits invoke, it barfs. You can see the callstack in one of the previous posts.
Thanks,
Keith
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Have you done an experiment where the dialog is hidden before you even start the thread? This would avoid the possible race condition, and would demonstrate if the problem is indeed a race condition, or something else (the latter being true if you still get an exception in the invoke)?
You could probably use the debugger (with a breakpoint in both threads, and stepping the dialog closed before stepping the background thread into SetProgressValue()) to force your way past the possible race condition.
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I have had a similar problem many times. In a lot of my apps, I have a textbox that sits on a form, and any thread can write a line to it. I have poured over documentation, and never found a solution to whether the form has been closed or not. So, I simply added the following :
private volatile bool formClosed = false;
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
formClosed = true;
}
delegate void ProgressValueDelegate(int value);
public void SetProgressValue(int value)
{
if (this.InvokeRequired)
{
ProgressValueDelegate pvd = new ProgressValueDelegate(SetProgressValue);
this.Invoke(pvd, new object[] { value });
}
else
{
if( formClosed == false )
{
m_progressBar.Value = value;
}
}
}
BTW, you can also move the if to before the if (this.InvokeRequired) to save yourself an Invoke call if it won't be doing anything in anycase.
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