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Hello,
I was wondering, how do you people update you UI such as controls, menu items and tool bar buttons?
I'd like to have something like ON_UPDATE_UI in MFC, but there's nothing in .NET. Currently I've used a timer every 1/4 of a second and it seems to work ok, without using much CPU time.
I know I could use MenuPopup events (it won't work since I have toolbar buttons for menu items), SelectedIndexChanged events and so on, but I would like a general approach.
Any ideas?
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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To simply refresh the form (to redraw it's self) use: this.invalidate;
Please correct me if i'm wrong on this.
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It works as you say, but is not what I'm looking for.
I'm asking about ideas to implement an update mechanism for user interface elements (menu items, toolbar buttons, controls).
For example, you only want the Delete button enabled if an item is selected in the list view control. You could use the SelectedIndexChanged event, but that would be particular for that list view control. What I want is a generalized mechanism for doing this.
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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From reading that page, it seems a little too complicated for a general solution for a small app, isn't it?
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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Luis Alonso Ramos wrote:
From reading that page, it seems a little too complicated for a general solution for a small app, isn't it?
True, it all depends on how small the app really is.
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Does the Application.Idle event serve your purpose?
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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Okay, so I'm just starting to work with AJAX, and I've run into one small problem. I have a .Net dropdownlist control with an "onChange" javascript event and an "OnSelectedIndexChanged" .Net event. When the selection is changed, I am populating another dropdownlist. Everything with AJAX seems to be working. The problem is, the dropdownlist is defaulted to one value. If I select a new value, everything works. But, if I then go back and select the original value, it does not work. The reason is that because I'm not doing an actual "PostBack", the selected value never really changes. So, when I go back to select the original value, .Net does not fire the "OnSelectedIndexChanged" event. Does this make sense? If so, does anybody know how I can fix this? Or something I could try? I've been racking my brain for hours to no avail. I can post code, but I'm pretty sure that won't make much of a difference. Thanks for any help.
Ex.
DEFAULT: LISTBOX1: A LISTBOX2: A, B, C, D
CHANGE : LISTBOX1: B LISTBOX2: E, F, G, H
CHANGE : LISTBOX1: A LISTBOX2: E, F, G, H (because .Net event didn't fire)
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You might try posting this in the ASP.NET[^] forum.
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Hello,
Is there a way to display a full row from a dataset, using some command,
or do I have to use sort of this statement where I have to list every column I want to be displayed.
Debug.WriteLine ("Row: "+myRows[0]["ProjectID"]+","+myRows[0]["ProjectTypeID"]+","+myRows[0]["EmployeeID"]+","+myRows[0]["VersionNumber"]);
Thank you
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You could use WriteRow 
<code>void WriteRow(DataRow row)
{
string str = "Row: ";
for(int i = 0; i < row.Table.Columns.Count; i++)
str += row[i].ToString();
Debug.WriteLine(str);
}I haven't tested this code, but it should work OK. I know a StringBuilder would be more efficent, but that's left as an excerise for the reader. (You could also output column names this way.)
Good luck!
-- LuisR
Luis Alonso Ramos
Intelectix - Chihuahua, Mexico
Not much here: My CP Blog!
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Hi friends,
I'm trying to detect locking of my workstation. so far I've worked a lot on it and the result of it is as following...
protected override void WndProc(ref System.Windows.Forms.Message m)<br />
{<br />
<br />
<br />
switch(m.Msg) <br />
{<br />
case WM_WTSSESSION_CHANGE:<br />
MessageBox.Show("Entered Session Change");<br />
switch((int)m.WParam)<br />
{<br />
case WTS_CONSOLE_CONNECT:<br />
MessageBox.Show("WTS_CONSOLE_CONNECT","WM_WTSSESSION_CHANGE");<br />
break;<br />
case WTS_CONSOLE_DISCONNECT:<br />
MessageBox.Show("WTS_CONSOLE_DISCONNECT","WM_WTSSESSION_CHANGE");<br />
break;<br />
case WTS_SESSION_LOCK:<br />
MessageBox.Show("WTS_SESSION_LOCK","WM_WTSSESSION_CHANGE");<br />
break;<br />
case WTS_SESSION_UNLOCK:<br />
MessageBox.Show("WTS_SESSION_UNLOCK","WM_WTSSESSION_CHANGE"); <br />
break;<br />
default:<br />
break;<br />
}<br />
break;<br />
<br />
default:<br />
break;<br />
}<br />
base.WndProc(ref m);<br />
}
The Messages like WTS_SESSION_LOCK and etc are also defined/declared in the application, as their values are found in windows.h;
Friends, my problem is that my application is running but it is neither responding to the code written above neither is generates any errors.
Please help me solve this problem. I want my system to respond to the above written code. Do I need to change it or any suggestions????? Please reply As Soon As Possible.
Thank u very much all in advance.
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I've read a bunch of hubbub about side-by-side versioning in .NET, but what I haven't seen so far is a "live patching" mechanism. Specifically, I work with lots of ASP.NET applications, and we've had many many cases where we've ended up having to do complete releases to change one line of code. Surely there's a better way... In the old days' we'd have some sort of binary diff program we'd run on the executable... what's the right way to go here? And what's the right way to go specific to ASP.NET, where there are a lot of runtime generated assemblies?
Ian
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If all you change is an aspx, you can just upload that file. If you change the code, then you need to upload the dll. You don't need to upload all your aspxs, just because you changed a line of codebehind.
I'm sure a binary diff ( being just a binary process ) will work just as well in .NET as it did in C++.
Christian Graus - Microsoft MVP - C++
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Hello,
I have the statement as indicated below, after I find the appropriate the row in my dataset, I want to duplicate this whole row, but change the values of 2 row element. How can I do that?
foreach (DataRow row in dataset.Tables["Versions"].Rows) {
if ((row["ProjectID"].ToString() == currProjID) && (row
["VersionNumber"].ToString() == currentVersion)) {
string verID = row["VersionID"].ToString();
if (row["IsProjectSetupComplete"].Equals(true)) {
WHAT GOES IN HERE?
}
}
}
Thank you.
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row["col"] = new value;
dataset.Tables["Versions"].Rows.Add(row.ItemArray);
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Im unable to find an error with this supposedly incorrect snippet that appeared in an aptitude test..please help me ASAP!!
i'd be very greatful...Thanx!
class Singleton
{
public static Singleton Instance() {
if (_instance == null)
_instance = new Singleton();
return _instance;
}
protected Singleton() {}
private static Singleton _instance = null;
}
Rohit(Mumbai)
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I think the only thing I can see that is wrong is that the constructor is protected. Therefore if a second class derived from this class then it would be able to call the base() call from it's constructor. The class itself would need to be set as FINAL so that no derived classes could be created.
Anybody else spot anything else????
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The singleton code is not thread safe. If it is guaranteed to run in a single threaded fashion, then I don't see any problem. But if two threads happen to call Instance() at the same time, there is a chance that there would be two separate Singleton objects, which defeats the very purpose of having a singleton.
The right way to do it is to protect the Instance() method with a lock. Something like
private static object syncObject = new object();
public static Singleton Instance()
{
lock(syncObject)
{
if (_instance == null)
_instance = new Singleton();
return _instance;
}
}
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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Does anyone here know where to find and how to use Microsoft's timezone control (the one where you set your time zone from Control Panel/Date & Time; shows a flat projection of the globe)?
Ideally, I'd like something like .NET's fontDialog() or colorDialog().
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If you don't care about the return value, you can just shell to
c:\winnt\system32\timedate.cpl
to pop up the date/time control panel applet.
Sean
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Thank you, Sean. That is very helpful, I'll investigate timedate.cpl. I do need to get the timezone the user selects, without actually changing the PC's settings. This is so a new timezone can be selected for a "World Clock" application.
Thanks again for your help.
John
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Ahhh, sorry, I don't think this will do what you want then. There are no command line parameters passable to the control panel applet (that I can find), and no way to retrieve the value once the user has set it by just shelling to the applet.
I don't think the map selection functionality is exposed as an ActiveX control either.
Sorry 'bout that.
Sean
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I want to dynamically load DLLs (created from VB) and instantiate a class with a particular name, like "ProcessClass".
I am able to load the DLL and confirm there is a class by that name BUT I can't seem to create it or call methods to this newly created instance. I have the following code:
public class Script
{
[DllImport("oleaut32", CharSet=CharSet.Unicode)]
private extern static void LoadTypeLib(string dllFilePath, out UCOMITypeLib typeLibrary);
UCOMITypeLib typeLibrary;
LoadTypeLib(dllName, out typeLibrary);
for (int i = 0; i < typeLibrary.GetTypeInfoCount(); i++)
{
typeLibrary.GetDocumentation(i, out typeName, out typeDocumentation, out typeHelpContext, out typeHelpFile);
if (typeName == "ProcessClass")
{
UCOMITypeInfo typeInformation;
object classInstance;
typeLibrary.GetTypeInfo(i, out typeInformation);
typeInformation.CreateInstance(null, ref guidIUnknown, out classInstance);
MethodInfo method = classType.GetMethod("DoSomething", BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public );
method.Invoke(classInstance, new object[0]);
}
}
}
Am I going down the wrong road? The class seems to be created without exception, but the created instance doesn't seem to be bound properly as I don't see any of the methods I'm looking for when I loop through!!
-Ray
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I'm trying to inherit a form an initially am able to do so, however when I build the project I loose the design view for the new inherited form. In the design view tab it says there was an exception 'Request for the permission of type System.Security.Permissions.SecurityPermission failed'
The project still builds and no error is thrown when the form is instantiated at run time. Any ideas where I might be going wrong?
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