Re: Child form in C# - C# Discussion Boards

Trollslayer27-Nov-09 13:00

27-Nov-09 13:00

Thanks Luc.
I won't be changing parameters 'on the fly' but will need to stop, pause and continue.
It may be necassary in the future to inject a script when the main script is paused.
System.Collections.Queue looks a good candidate and has a Synchronized method for thread safety.

Elaine Rose | [Rose]

Join the cool kids - Come fold with us[^]

Re: [More info] Re: Calling to a thread

Daniel Grunwald27-Nov-09 14:57

Daniel Grunwald

27-Nov-09 14:57

Be careful, the Synchronized method on the non-generic collections is mostly useless, see http://blogs.msdn.com/bclteam/archive/2005/03/15/396399.aspx[^].

As an introduction to writing multithreaded code on .NET, I recommend reading http://www.albahari.com/threading/[^] (especially the "Locking and Thread Safety" section / "Thread-Safety and .NET Framework Types" subsection).

Re: [More info] Re: Calling to a thread

Trollslayer27-Nov-09 23:25

Trollslayer

27-Nov-09 23:25

Thanks Daniel.
My application is simple enough I can use the first soluttion in this case (I hope!).
I have bookmarked both of these and now have a separate favourites folder called "Threading".

Join the cool kids - Come fold with us[^]

Distance calculator

Chazzysb27-Nov-09 8:57

Chazzysb

27-Nov-09 8:57

C# vs2008

Im building an application that needs to know the distance between 2 postcodes.
Are there any free web services or something with google I could use?

- Yes I know you can go onto google maps and find this out but I want the ability to do it in the back ground and display a cost for travel figure on the web form.

Thanks,
Chas

Re: Distance calculator

Roger Wright27-Nov-09 20:23

Roger Wright

27-Nov-09 20:23

Google also offers a free API for access to their data. While it is oriented toward displaying maps for your customers, it may also be able to provide just mileage data - I haven't checked. One thing I find valuable about Google Maps is that the travel time estimates are usually very accurate, and those require detailed knowledge of typical road conditions, not just speed limits. This info may all be available as background data, but you'll have to search for it.

You could also check with ESRI - they offer a bunch of tools for GIS/GPS mapping. But you'll pay 'til you bleed for their products and services. They're probably the best game in town, but the price of admission is steep.

Another thought, and one I haven't researched at all... Have you looked at what the USPS has to offer? After all, they assign postcodes in the US, and provide shipping information for all manner of users in the US. Thay probably keep track of foreign addresses, as well, and may offer a webservice for consumers to use. It's worth a look, especially if any of your applications need US-centric information.

"A Journey of a Thousand Rest Stops Begins with a Single Movement"

Child form in C#

VB Overlord27-Nov-09 7:45

VB Overlord

27-Nov-09 7:45

In this test program i have a Main Form, Child Form and a Class
Main=frmMain
Child=frmChild
Class=cAction.

On then Main form i have one button(call mnuClientInfo), when click it, it calls "ShowClientInfo" function in cAction Class to load frmChild
In VB.net I would write something like this:

With my.forms.frmChild<br />
if .Visible then<br />
.Focus<br />
Else<br />
.MdiParent=my.forms.frmMain<br />
.Show<br />
End if<br />
End with

How do I do this in C#?

Re: Child form in C#

Luc Pattyn27-Nov-09 9:07

Luc Pattyn

27-Nov-09 9:07

Hi,

There is no With construct in C#, so first modify your VB code to do what you want without using With, then you can port it directly to C#.

And if you want it done for you try one of the code converters[^] (no guarantee!).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Child form in C#

VB Overlord27-Nov-09 9:19

VB Overlord

27-Nov-09 9:19

Hi
Yeah, It was more how to get a Class to show a child form in a Mdi Form

<br />
					  {<br />
						  if (frmClientInfo.Visible)<br />
						  {<br />
							  frmClientInfo.Focus();<br />
						  }<br />
						  else<br />
						  {<br />
							  frmClientInfo.MdiParent = frmMain;<br />
							  frmClientInfo.Show();<br />
						  }<br />
					  }<br />
				  } <br />
			  }

That didn't work

Re: Child form in C#

VB Overlord27-Nov-09 9:29

VB Overlord

27-Nov-09 9:29

Hi
Yeah, it was to find out how to open a Child form from a class. I tried this:

{<br />
					  {<br />
						  if (frmClientInfo.Visible)<br />
						  {<br />
							  frmClientInfo.Focus();<br />
						  }<br />
						  else<br />
						  {<br />
							  frmClientInfo.MdiParent = frmMain;<br />
							  frmClientInfo.Show();<br />
						  }<br />
					  }<br />
				  } <br />
			  }

That didn't work....

Array from JavaScript

Hans Ruck27-Nov-09 3:01

Hans Ruck

27-Nov-09 3:01

Hi all,

Any idea about how could I return an array from the JavaScript code of a WebBrowser control? In another words: returning an array from a call of Document.InvokeScript.

Thank you.

Bogdan.

Re: Array from JavaScript

Shameel27-Nov-09 3:10

Shameel

27-Nov-09 3:10

Use JavaScript's return statement.

Re: Array from JavaScript

Hans Ruck27-Nov-09 3:14

Hans Ruck

27-Nov-09 3:14

Well, it seems that it didn't cross my mind...

Anyway, assuming that I do that, how should I interpret the answer on the .NET side? Chances are to get some COM wrappers of an interface I don't know.
That's what I'm looking for, the appropriate interface to communicate through.

Bogdan.

Re: Array from JavaScript

Shameel27-Nov-09 3:22

Shameel

27-Nov-09 3:22

The return type for Document.InvokeScript is object. May be you should step through the code in the debugger and inspect what the return value contains.

Re: Array from JavaScript

dojohansen27-Nov-09 4:40

dojohansen

27-Nov-09 4:40

I tried that actually.

In a script block in the head of the HTML doc:

function f() { return [1,2]; }

In the C# code:

var list = browser.Document.InvokeScript("f");
ToString(); // Breakpoint dummy :)

Alas, list was null!

Re: Array from JavaScript

dojohansen27-Nov-09 4:38

dojohansen

27-Nov-09 4:38

Almost certainly IDispatch.

About dateTimePicker problem [modified]

miss YY27-Nov-09 2:24

miss YY

27-Nov-09 2:24

string from,to;
from=this.dateTimePicker1.Value.ToShortDateString();
to=this.dateTimePicker2.Value.ToShortDateString();
string str="select * from Furn_Info where Time between ‘"+from+"’
and ‘"+to+"";

but i do not want to use "between.....and"
i want to use ">=" and "<=",
i use data SqL2000,Field "Time" Property is datetime,how should it be?
please help me !thanks

modified on Friday, November 27, 2009 8:41 AM

Re: About dateTimePicker problem

Rob Philpott27-Nov-09 2:36

Rob Philpott

27-Nov-09 2:36

string str="select * from Furn_Info where Time >= '"+from+"' and Time <= '"+to+"'";

Although you should think about parameterising the 'from' and 'to' rather than building a string with them.

Regards,
Rob Philpott.

Re: About dateTimePicker problem

Luc Pattyn27-Nov-09 2:47

Luc Pattyn

27-Nov-09 2:47

As Rob said, avoid using strings for dates, it only yields problems when you move to a PC with a different datetime formatting. Store real dates and times and datetimes in your database, not strings, and use parameterized SQL, which accepts date/datetime values directly instead of strings.

And please use PRE tags to show us your code.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

C# translation to vb.net

webspeed27-Nov-09 0:28

webspeed

27-Nov-09 0:28

private long bytesUploaded;
public long BytesUploaded
{
get { return bytesUploaded; }
set
{
bytesUploaded = value;

this.Dispatcher.BeginInvoke(delegate()
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("BytesUploaded"));
});
}
}

Re: C# translation to vb.net

Shameel27-Nov-09 0:33

Shameel

27-Nov-09 0:33