Re: show form from worker thread - C# Discussion Boards

Heath Stewart12-Dec-03 4:15

12-Dec-03 4:15

What do you mean by "server" event? Adding the Click event handler automatically renders the correct HTML. If you want the server to watch for something to happen, you can't for so many reasons:

HTTP is by nature non-stateful.
ASP.NET runs server-side and generates client-side code (HTML, Javascript, images, etc.) that the browser downloads to the user's machine.
These two do not maintain persistent communications.
The only way the client can alert the server of a change is by making a new request to get the file (without the use of ActiveX, Java Applets, or using javascript with special automation objects that are different from browser to browser and sometimes not available at all).

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

my fatherland

duaneye200311-Dec-03 23:23

duaneye2003

11-Dec-03 23:23

http://www.china-vips.com/bbs/dispbbs.asp?BoardID=12&id=12866&replyID=82911&star=1&skin=

village in my fatherland.
my broken heart

Static libraries and C#

Severino11-Dec-03 22:20

Severino

11-Dec-03 22:20

Hello,

I would like to know if there is some way to use a static library (a .LIB developed using C++) from C#.
Any idea?

Regards

Severino

Re: Static libraries and C#

Heath Stewart12-Dec-03 4:05

Heath Stewart

12-Dec-03 4:05

Isn't possible. .NET uses assemblies that contain dependency references, assembly attributes, modules (what actually contain the code), embedded resources, and a manifest that lists it all.

This does imply, however, that you could write a library and compile it as a module (only possible with the command-line compiler, csc.exe (C# compiler) using the /t:module parameter. You can then compile an assembly that contains your code plus this module. It's not quite the same thing, but the result is pretty much the same. Again, this is only available with the command-line compiler. VS.NET doesn't support this.

Doing things this way will result in an assembly with two different modules. There is an article at an old hang-out that describes writing assemblies with modules in different languages. The principal is the same even if you use the same language, though: http://www.devhood.com/tutorials/tutorial_details.aspx?tutorial_id=466[^].

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

Re: Static libraries and C#

Eric Gunnerson (msft)12-Dec-03 13:31

Eric Gunnerson (msft)

12-Dec-03 13:31

Two options:

1) Compile it into a DLL.
2) Write a wrapper using Managed C++.

show form from worker thread

Alastair Stell11-Dec-03 19:34

Alastair Stell

11-Dec-03 19:34

I have created a worker thread. Now I would like to create a separate window (form) to watch the progress of the thread. I specifically do NOT want to use an invoke back to the main form because I'm starting several such threads and wish to monitor them independantly. Obviously I would like the worker thread to directly create and show its own form.

Well I can easily create and show a form from the worker thread, however the form is not receiving window events and consequently nothing much happens.

What do I need to do in order to get this form to respond to windows messages?

Any advice people? Thanks Alastair

Only change is constant unless it isn't

Re: show form from worker thread

Corinna John11-Dec-03 19:40

Corinna John

11-Dec-03 19:40

Are there any Application.DoEvents(); calls in the worker thread? Otherwise the form gets no time to process the window messages.

Re: show form from worker thread

Alastair Stell11-Dec-03 19:46

Alastair Stell

11-Dec-03 19:46

Ohmygod. Do I feel stupid or what? Thank you John. I have no idea what I was thinking. Anyhow of course I didn't so the poor thread couldn't service events. In partial mitigation it is 11.47pm here and I have flu.

Problem solved. Thanks again!

Only change is constant

Re: show form from worker thread

Alastair Stell11-Dec-03 19:47

Alastair Stell

11-Dec-03 19:47

Or is that Corinna? I can never figure out first from last names...

Only change is constant

Re: show form from worker thread

Corinna John11-Dec-03 21:35

Corinna John

11-Dec-03 21:35

Corinna: First Name, usually abbreviated (Coco)
John: Ugly Last Name. (One day I'll marry someone just to get a better name.)

How to displaying User Options in a Windows Service

john ingram11-Dec-03 11:56

john ingram

11-Dec-03 11:56

How do you display User Options in a Windows Service.

I know you can stop/start/pause/restart a service.

The is a way to add options to start a windows service. Is there anyway to display these options with out starting the service.

John Ingram

Re: How to displaying User Options in a Windows Service

Heath Stewart11-Dec-03 12:01

Heath Stewart

11-Dec-03 12:01

As you said, you can provide command line arguments in the Services control panel / snap-in.

If you need to configure the options in a different way, you could use a Windows Forms application that either uses registry settings or writes on a .config file (or other configuration file) for the service. You can use the ServiceController class to start, stop, or pause the service programmatically then.

If you want to configure the options while the service is running, you need to use the ServiceController.ExecuteCommand to pass a command identifier. If you need to change more complex options, you can use .NET Remoting over a TCP or HTTP channel.

how do I add a Footer to a datagrid (windows forms)

mdolby11-Dec-03 11:25

mdolby

11-Dec-03 11:25

Hello,

I want to add a footer to a datagrid in a windows forms (like the datagrid for asp.net).. How do I go about doing this???

For example I want to display the totals of a columns in the footer..

any help is appreciated!!

Re: how do I add a Footer to a datagrid (windows forms)

Heath Stewart11-Dec-03 11:35

Heath Stewart

11-Dec-03 11:35

Put a Label control or something similar under the DataGrid. You can update the Label.Text property by aggregating the values in a particular column of your DataGrid. We do that in our app in several cases.

Note that System.Windows.Forms.DataGrid and System.Web.UI.WebControls.DataGrid are very different, both in terms of presentation and logic. The former is a Windows Control that binds differently than the latter, and the latter generates an HTML <table>, which makes having a footer template trivial (since it just uses the <tfoot> tag and adds your rows and columns). They are very different beasts and, IMO, should not be compared.

Re: how do I add a Footer to a datagrid (windows forms)

john ingram12-Dec-03 2:23

john ingram

12-Dec-03 2:23

Thank you.

assembly versioning

Dave Bryant11-Dec-03 11:05

Dave Bryant

11-Dec-03 11:05

My applications use a large number of components (DLLs and EXEs) which previously (using VC6.0) we built using a big build script, and then at the end we ran a program over all the modules which stamped them all with exactly the same version. This made it very easy to tell if a customer has a consistent version of all the components.

Recently I've just created a .NET component that will be released with the rest of the applications. My question is: Is there any way to set the assembly version of an assembly that has already been generated? With the normal Win32 modules I can load then and then modify the resources using the appropriate APIs - but will this work for a .NET component - particularly since the version is part of the strong name of the component?

Dave
http://www.cloudsofheaven.org

Re: assembly versioning

Heath Stewart11-Dec-03 11:31

Heath Stewart

11-Dec-03 11:31

You can use the Win32 resource editing trick for the version of the executable, but not the assembly. Doing this will also invalidate signature if you use signed assemblies (and you should be, especially since it makes versioning easier via config files and policy assemblies, which must be in the GAC and assemblies in the GAC must be signed).

Even if you did change the version and resign the assembly, it still wouldn't be an easy task. You would have to emit an assembly based on a template (the existing assembly).

Frankly, IMO, just implement a policy whereby your developers put the appropriate assembly version into the [assembly: AssembyVersionAttribute] when compiling for the last time. Or, if you have a build master, he or she could either do it (or use a macro to change the AssemblyInfo.cs file (or wherever you put it) to make it quick) and then compile under a release build.

Just remember that the version number in the VersionInfo block of the executable's .rsrc section has little to no bearing on the assembly itself. The AssemblyVersion attribute is what matters, and that's in the MANIFEST for the assembly.

One example: Infragistics commonly updates their assemblies while leaving the AssemblyVersionAttribute with the same value, but changes the executable image's VersionInfo block so that the FileVersion is different. While this makes updating your applications without recompiling easier, it totally screws-over touchless deployment over the Internet because Fusion (the assembly binder) caches assemblies based on their strong name in the temporary assembly cache. Since the assembly version didn't change, the new code isn't always downloaded! (The cases where it is depends on Internet Explorer's cache settings.)

ListView problem

datainjector11-Dec-03 10:44

datainjector

11-Dec-03 10:44

hi i have just added this auto complete feature in my combo box .. When the user leaves the focus from the combobox .. it fires the leave event ... in this event i do this ...

listView.Items[index].Selected = true;

And in the list view selected event i have added some code that get the data from the listview and put them into the appropraite textBoxs or Combox... my problem is this code works just fine only 1 time... the second time it does execute the leave focus event but dosnt set the selected index ... i have no idea why is it doing that

Thanks
DaIn

Re: ListView problem

Heath Stewart11-Dec-03 11:39

Heath Stewart

11-Dec-03 11:39

Did you try debugging and stepping through the relevent code line by line? Sometimes unexpected exceptions are thrown and handled, or a condition fails. In either case, you should be able to find more information that may help you solve the problem, or provide some additional information to post along with your problem; because, by itself this post doesn't really present any particular problems.

Re: ListView problem

datainjector12-Dec-03 7:52

datainjector

12-Dec-03 7:52

<br />
private void listView1_SelectedIndexChanged(object sender, System.EventArgs e)<br />
	{<br />
		if ( listView1.SelectedItems.Count > 0 )<br />
		{<br />
			codeComboBox.Text =   listView1.SelectedItems[0].SubItems[0].Text;<br />
			modNameTextBox.Text =    listView1.SelectedItems[0].SubItems[2].Text;<br />
			modAdd1TextBox.Text  =   listView1.SelectedItems[0].SubItems[3].Text;<br />
			modAdd2TextBox.Text = listView1.SelectedItems[0].SubItems[4].Text;<br />
			modCityTextBox.Text  = listView1.SelectedItems[0].SubItems[5].Text;<br />
			modPinTextBox.Text = listView1.SelectedItems[0].SubItems[6].Text;<br />
			modPhoneTextBox.Text  = listView1.SelectedItems[0].SubItems[7].Text;<br />
			modContactPersonTextBox.Text = listView1.SelectedItems[0].SubItems[1].Text;<br />
		}<br />
	<br />
	}<br />
<br />

Thats for the selected index....

<br />
private void codeComboBox_Leave(object sender, System.EventArgs e)<br />
	{<br />
		ClearSelected();<br />
		listView1.Items[index].Selected = true;<br />
}<br />

The index Varaible stores the index of the ID in the listView...

This only seams to execute once ...

Re: ListView problem

Heath Stewart12-Dec-03 8:36

Heath Stewart

12-Dec-03 8:36

The ComboBox.Leave event is probably not the place you want to be doing this. This event occurs every time your mouse exits the region filled by the ComboBox. Instead, just handle the ComboBox.SelectedIndexChanged.

As far as the problem, if the above suggestion doesn't solve it (indirectly), make sure the ComboBox is throwing the event correctly and step through your code - as I said before - to find where the error is. Also, make sure that your ClearSelected method isn't throwing any exceptions that would cause your code to exit prematurely before the listView1.Items[index].Selected = true is executed.

Using Dropdownlist in Datagrid

t_m2002052111-Dec-03 9:29

t_m20020521

11-Dec-03 9:29

I am creating a web application using dropdownlists in the datagrid.
My question is. I have two dropdownlists in the datagrid. First one select * from sq. That is working Ok.
After the first one is selected the data and pass the argument to Second one
which is retrieved data. Second one does not work. Nothing.
Second query likt select A from sq where name = 'argument'.
Is anyone can help me Hmmm | :|

?
Thanks

Re: Using Dropdownlist in Datagrid

Heath Stewart11-Dec-03 10:35

Heath Stewart

11-Dec-03 10:35

Unless you're using auto-postback, you'll need to use client-side Javascript to do this. Remember that ASP.NET describes server-side code written in a language that targets the CLR. Only some basic javascript is necessary for some ASP.NET controls to work, but anything in HTML (what ASP.NET generates for most classes) that must change without hitting the server must be performed by client-side script.

So, either set AutoPostBack to true on your first drop-down, or pass all necessary data to both drop-downs and use some javascript and event handlers on the drop-downs (client-side event handlers) to select the appropriate data.

ComboBox DropDown

Shaun Becker11-Dec-03 7:32

Shaun Becker

11-Dec-03 7:32

I need to create a combo box control with a custom drop down. Now, before I try to create this from scratch, is there a way to disable the drop down? Thanks for your help

Re: ComboBox DropDown

Not Active11-Dec-03 7:58

Not Active

11-Dec-03 7:58

Disable the dropdown? You mean like a listbox?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.