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This[^] should give you enough information to sort your list of students in any way you like.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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I have a context menu with 11 items on it, and I want to use a single event handler that will catch a click on any one of those menu items. Then I want to know which menu item was clicked and get its text value. I know how to write methods to catch the click event for each menu item individually, but surely I don't have to write a single method for each menu item click, right? This is what I know how to do for a single menu item:
private void menuItem10_Click(object sender, EventArgs e)
{
locationButton.Text = menuItem10.Text;
locationButton.BackColor = System.Drawing.Color.Blue;
}
This is what I'd like to do, but I don't know how to have a single event handler with each menu item registered to it. In other words, can I have a single event handler (we'll call it 'MenuClick') that listens for a click on any one of the menu items in the context menu? Do I have to register each one line by line or can I use a loop?
private void MenuClick(object sender, EventArgs e)
{
System.Windows.Forms.MenuItem clickedMenuItem = sender as System.Windows.Forms.MenuItem;
if (clickedMenuItem != null)
{
locationButton.Text = clickedMenuItem.Text;
locationButton.BackColor = System.Drawing.Color.Blue;
}
}
To register each one, it's like this:
this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);
To register each one individually seems a bit overkill and I'm looking for a loop instead. But I don't see how you can dynamically name and register a menuItem object using a variable. In other words, I don't see this as being valid:
for (i = 0; i < 12; i++)
{
this.menuItemi.Click += new System.EventHandler(this.menuItemi_Click);
}
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namelkcip wrote: and get its text value
That's a bad idea.
namelkcip wrote: .menuItemi_Click
You can do that if you make an array of items.
namelkcip wrote: new System.EventHandler
We haven't had to do that in many years.
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if you want each MenuItem of some Menu to have the same click handler, use a simple loop like this:
foreach(MenuItem mi in myMenu.MenuItems) mi.Click+=menuItem_Click;
BTW: mi.Click+=menuItem_Click; is shorthand notation for mi.Click += new System.EventHandler(this.menuItem_Click);
Relying on the MenuItem's text isn't in accordance with defensive programming rules, as you might later on change the item's text (e.g. by introducing Internationalization) and break your code. A better way might be to attach some information (the reference to some object typically) to each of the MenuItems' Tag property, which is available for exactly such purposes.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
modified on Friday, June 10, 2011 8:44 AM
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Is it possible to do this?
Here is my test function which does work locally. How can I get these values remotely, I haven't been able to find much on the net?
Thanks for reading.
NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
MessageBox.Show(adapter.Name);
MessageBox.Show(adapter.OperationalStatus.ToString());
MessageBox.Show(adapter.Description);
MessageBox.Show(adapter.NetworkInterfaceType.ToString());
MessageBox.Show(adapter.Speed.ToString());
MessageBox.Show(adapter.GetIPProperties().UnicastAddresses[0].Address.ToString());
}
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GetAllNetworkInterfaces() is specifically for the local computer, so unless you run it on the remote computer and relay the information back some way, then you can't use it.
You may be able to use WMI if it provides the information you need and the network security configuration allows it. See the WMI "Win32_NetworkAdapter" class...
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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I did look at that class and I am very unfamiliar with WMI, I wasn't able to get much of anywhere with it ... here is what I tried, the only part I wasn't sure of is which values to search for after it queries the database.
public static string getNetworkCardInformation(string serverName)
{
string networkCardInformation = "";
try
{
ConnectionOptions options = new ConnectionOptions();
ManagementScope scope = new ManagementScope(GetStandardPath(serverName), options);
scope.Path = new ManagementPath(@"\\" + serverName + @"\root\cimv2");
scope.Options.Impersonation = ImpersonationLevel.Impersonate;
scope.Connect();
ObjectQuery query = new ObjectQuery("Select * from Win32_NetworkAdapterConfiguration where IPEnabled=TRUE");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
ManagementObjectCollection queryCollection = searcher.Get();
using (ManagementObjectSearcher search = new ManagementObjectSearcher(scope, query))
{
foreach (ManagementObject service in search.Get())
{
networkCardInformation = service["IP address="].ToString();
}
}
}
catch (ManagementException ex)
{
networkCardInformation = "ERROR : " + ex.Message;
}
catch (COMException exc)
{
networkCardInformation = "ERROR : " + exc.Message;
}
catch (Exception e)
{
networkCardInformation = "ERROR : " + e.Message;
}
return(networkCardInformation);
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Hi,
here is a code snippet I use to discover the content of some WMI class on the local machine; it tells what keys exist together with their value:
string clas="Win32...";
ManagementObjectSearcher searcher=new ManagementObjectSearcher("SELECT * FROM "+clas);
ManagementObjectCollection results=searcher.Get();
log("There are "+results.Count+" items in "+clas);
int count=0;
foreach (ManagementObject result in results) {
log("=============== "+clas+"["+count+"] ===============");
count++;
PropertyDataCollection pdc=result.Properties;
foreach (PropertyData pd in pdc) {
string name=pd.Name;
object obj=pd.Value;
if (obj!=null) {
string[] sa=obj as string[];
if (sa!=null) {
string ss=string.Join("\";\"", sa);
log(count.ToString()+": "+name+" = string[] = \""+ss+"\"");
} else {
log(count.ToString()+": "+name+" = \""+obj.ToString()+"\"");
}
}
}
}
You could adapt it to also run remotely and only report the key,value pairs you're interested in.
PS: I'm sure the keys don't end on an equal sign!
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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Thank you very much, I will try that tomorrow when I get back to work.
I just started using WMI today, so the equals sign thing, lol
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You're welcome.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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Thank you Mark, that looks like something I can adapt right to what I already have!
I'll try it tomorrow and report back.
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hello guys... I dont know where to put this question. Lets say I have made a notepad in C#.NET. Now how can I run that notepad on linux platform? thnx
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You'd need a version of .NET that runs on Linux (obviously). Fortunately, there are Linux versions around, the most popular is called Mono.
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Hi,
Have written a small Windows service which monitors a single folder waiting for simple text files to arrive in said folder. Once a file or files arrive, the service converts them to XML, deletes the file(s) from the 'in' folder, copies it to an 'out' folder where another process deals with them. It's a simple, clean service which runs fine 99% of the time.
However, the other 1% of the time, a file or files arrives in the 'in' folder and nothing happens. The service doesn't seem to have noticed that anything has arrived in the folder it's watching.
Does anyone know of any reason why the service would stall every so often. It's a very small problem but one that I'd like to iron out if I can....
Thanks in advance
Scott
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Are you using the FileSystemWatcher to catch the fact that a file has been created? If you are, you should be aware that it's not 100% effective. It has some gaping deficiencies.
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I am indeed using FileSystemWatcher to monitor the folder but I admit I was unaware of any deficiencies in it. Can you explain a little what they are please?
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It will sometimes send a notification that a file was created before the file has finished being written. That is probably a problem more often with larger files. Like a person said below, the solution is to wait a few milliseconds if the file is not yet available. One way to do this would be to use a try/catch to check if you were able to gain a write lock on the file. If that fails, wait a few milliseconds and try again.
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I'd just like to add that you should acquire a full lock, meaning you don't want to share the file for reading nor for writing (nor for deletion). That way, you'll be sure that no other handles to the file are open before acquiring the lock.
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Hi.
Sometimes it happens that your thread which is responsible for creating XML files tries to read the arrived text file when it's not completely free (some service is still using it).
Try to wait for some milliseconds before attempting to open the text file like this:
Thread.Sleep(100);
I hope this will work.
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In addition to the previous answers, I would like to suggest you on increasing the InternalBufferSize property of your file system watcher object to a bigger value.
It might help when a large number of files are being created at the same time. The lesser the value of the InternalBufferSize, the more are the chances of file changes / creations going unnoticed by the watcher.
Hope this helps.
ramzg
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Hi all,
Thanks very much for the suggestions so far. Will implement those changes now, hopefully that will sort this last bug out.
Much obliged to you all,
Scott
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Hi,
as others already explained, FSW has a limited buffer, so for a very active folder you might miss some events, however that seldom is the problem; the actual problem typically is FSW gets triggered by the beginning of some action (such as file creation), whereas your app typically is interested in the end of the action (file created and available).
My solution (applies only if the producer can be slightly changed) is by using a sentinel file: have the producer create and write the file of interest first, then emit a small file that signals the former has been created and written; and now make the FSW watch out for that sentinel file only; it being small causes start and end creation to coincide, so there is no need to wait or to retry. And you could store the data file's name inside the sentinel file, to remove all uncertainty.
Luc Pattyn [My Articles] Nil Volentibus Arduum
The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Please use <PRE> tags for code snippets, they improve readability. CP Vanity has been updated to V2.4
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Sorry Luc for being lazy but would this still be an issue when streaming data in a separate thread?
"You get that on the big jobs."
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