|
You can use delegates to pass data between forms - this article[^] describes this approach in some detail.
modified 29-Jul-12 6:33am.
|
|
|
|
|
Hi Abhinav, please note my comment (written today) on that article you linked to, indicating what I think is a major flaw in its implementation.
best, Bill
"Everything we call real is made of things that cannot be regarded as real." Niels Bohr
|
|
|
|
|
That depends on what you're transferring and why.
There are various methods to do so, some more appropriate than others depending on what your application is doing.
Form2 could expose properties that your Form1 code sets, or you could use delegates to pass data to a method on Form2, or both forms could be using the same data object where Form1 sets some values in this object and Form2 picks it up by some notification method the data object exposes, ...
|
|
|
|
|
Please describe in more detail exactly what you mean by "transfer data" here.
Re the comments by esteemed colleagues, Dave Kreskowiak, and Abhinav S: I don't know why, but every time I see someone advocate using delegates, in this type of context, without also using the words "and events," a kitten inside my mind dies  I'll try to get over that !
thanks, Bill
"Everything we call real is made of things that cannot be regarded as real." Niels Bohr
modified 30-Jul-12 1:07am.
|
|
|
|
|
BillWoodruff wrote: without also using the words "and events," a kitten inside my mind dies I'll try to get over tha
|
|
|
|
|
Well, they kind of go hand-in-hand in a case like this, not that I ever use them for this.
I've got a bigger problem with "esteemed colleagues". This is like calling the crew from Animal House "proper gentlemen"! 
|
|
|
|
|
hello
how do convert any Image and gif or swf to dot matrix display and scroll it.
please send me sample code with c#.
very thanks.
hosseinjavidian@gmail.com
|
|
|
|
|
Never post your email address in any forum, unless you really like spam! If anyone replies to you, you will receive an email to let you know
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
|
|
|
|
|
|
You're going to have to explain exactly what you mean by "dot matrix display". Are you talking about an LED driven piece of hardware? Are you talking about some control you drop of your form? Are you talking about some LED display contorl you're creating??
Without knowing this, it's pretty much impossible to tell you "how to scroll" on this display.
|
|
|
|
|
|
You do realise that the original poster doesn't get replies to questions when you reply to someone else, don't you? I don't think Dave's particularly in need of doing this.
|
|
|
|
|
Pete is correct. Why are you telling ME this??
I already know this stuff, and, frankly, would NEVER use a parallel port to control anything as it's too easy to blow the port up. I'd use hardware dedicated to the purpose like something from Phidgets or a Netduino or Arduino.
Since the original poster never specified what they were using as an "LED display" the question is unanswerable. I really don't feel like going through every possibility of scrolling an image on every type of "LED display" as it would take a small book to describe them all.
|
|
|
|
|
Hello I am new to xml. I want to read the data from xml file. Here is my xml code :
<overseas_sales>
<overseas_sale_ad>
<country>Spain</country>
<area>Costa Blanca South</area>
<property_type>house</property_type>
<price>95000</price>
<price_type>region</price_type>
<bathroom_number>2</bathroom_number>
<bedroom_number>2</bedroom_number>
<property_status>for-sale</property_status>
<external_id>R214</external_id>
<photos>
<photo>http://www.solmarestates.com/images/propimages/R2141.jpg</photo>
<photo>http://www.solmarestates.com/images/propimages/R2142.jpg</photo>
<photo>http://www.solmarestates.com/images/propimages/R2143.jpg</photo>
<photo>http://www.solmarestates.com/images/propimages/R2144.jpg</photo>
<photo>http://www.solmarestates.com/images/propimages/R2145.jpg</photo>
<photo>http://www.solmarestates.com/images/propimages/106_1218710541.jpeg</photo>
<photo>http://www.solmarestates.com/images/propimages/106_1218710543.jpeg</photo>
<photo>http://www.solmarestates.com/images/propimages/106_1218710546.jpeg</photo>
</photos>
</overseas_sale_ad>
Now I want to get all photos in a list . I am trying with code :
XmlNode root = PropertyDocument.SelectSingleNode("//overseas_sales");
XmlNodeList nodeList = root.SelectNodes("overseas_sale_ad")
ArrayList ElementsList = new ArrayList();
foreach (XmlNode n in nodeList)
{
if (n.SelectSingleNode("external_id").InnerText == ID)
{
XmlNodeList photos = n.SelectNodes("photos");
foreach(XmlNode ph in photos)
{
ElementsList.Add(ph.SelectSingleNode("photo").InnerText);
}
}
}
But I am getting url of only first photo. I want to get them all in "ElementList". Can anyone help?
|
|
|
|
|
Well yes. That is what I would expect - you only have the one "photos" node. You need another loop:
XmlNode root = PropertyDocument.SelectSingleNode("//overseas_sales");
XmlNodeList nodeList = root.SelectNodes("overseas_sale_ad");
ArrayList ElementsList = new ArrayList();
foreach (XmlNode n in nodeList)
{
if (n.SelectSingleNode("external_id").InnerText == ID)
{
XmlNodeList photos = n.SelectNodes("photos");
foreach (XmlNode ph in photos)
{
foreach (XmlNode photo in ph.SelectNodes("photo"))
{
ElementsList.Add(photo.InnerText);
}
}
}
}
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
|
|
|
|
|
Thank you so much, adding another loop solved my problem. 
|
|
|
|
|
You're welcome!
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
|
|
|
|
|
You need to use SelectNodes to get them, not SelectSingleNode, and I would use one loop:
foreach(XmlNode ph in nodeList.SelectNodes("//overseas_sale_ad[external_id='R214']/photos/photo"))
{
ElementsList.Add(ph.InnerText);
}
Brush up on XPath.
I would also use a List<string> rather than an ArrayList -- no one uses ArrayList anymore.
|
|
|
|
|
'System.Xml.XmlNodeList' does not contain a definition for 'SelectNodes' and no extension method 'SelectNodes' accepting a first argument of type 'System.Xml.XmlNodeList' could be found (are you missing a using directive or an assembly reference?)
Thank you for your reply. I am getting this error. But no problem I got my solution
|
|
|
|
|
Oh, yeah, you need a node. No biggy. You should still only need one loop.
faiza.butt89 wrote: I got my solution
modified 30-Jul-12 9:51am.
|
|
|
|
|
I am using myform.Activate() to activate MDI Child form and running a code on activation. what is the form already active? is it possible to re-activate so my code will run again on activation?
|
|
|
|
|
Move the code to it's own method.
You're depending on a simple specific behavior of a form to trigger the exection of code that needs to be triggered under varying circumstances. move the code to it's own method so you can call it from Form.Activate and other events as needed. I have no idea what you're doing or why this code needs to be executed on Activate so it's impossible to suggest something appropriate.
The only way to get Activate to fire again is to make another form active and then make your target form active again. The problem with that is the active form will redraw itself to be on top or your real target form and then the target form will again redraw itself on top of the others, making your form "flash".
|
|
|
|
|
I have a page with a few validation controls and a ValidationSummary control. Most of the validation controls are RequiredFieldValidator controls and the summary control displays these messages just fine.
I do have a RegularExpressionValidator that checks for the format of an email address. If the address isn't entered correctly my error message from this control isn't being displayed by my summary control.
I know the problem isn't with my regular expression as I can display the error message by the regex control if I change the Display setting.
ValidationSummary doesn't just work with RequiredFieldValidator does it? That would be less than helpful.
My code :
<asp:ValidationSummary ID="ValidationSummary1" ValidationGroup="Test" HeaderText="You must enter a value in the following fields:"
DisplayMode="BulletList" EnableClientScript="False" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ValidationGroup="Test" ControlToValidate="txtReqDuration"
ErrorMessage="Enter a valid number" Display="None" ValidationExpression="^([\d]{0,2})$"></asp:RegularExpressionValidator>
Thanks.
|
|
|
|
|
You already posted this in the ASP.NET forum; please do not multi-post the same issue.
One of these days I'm going to think of a really clever signature.
|
|
|
|
|
i put this code in textbox_textchanged and textbox_editvaluechanged, both didn't work.
yes i'm new in C#, but i think this is so simple.
is this a problem in threading
string uppercase = this.txtLicense.Text.ToUpper();
this.txtLicense.Text = uppercase;
i'm not sure i need to create a new thread just to force a textbox uppercase. 
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
