Re: Event triger - C# Discussion Boards

Paul Riley19-Sep-02 5:33

19-Sep-02 5:33

Yes!

Create a method that does this, then go to the form designer, select one of your text boxes, click the little lightning (properties) button above the properties, find the correct event in the list, then use the drop-down next to it to select your method.

Then repeat for your other text boxes.

This attaches the same function to each of the three delegates. Neat. I do the same thing on a web form.

Paul

Re: Event triger

David Stone19-Sep-02 5:38

David Stone

19-Sep-02 5:38

Oh, I see the "I put each in the textBox_textChanged method" thing. Duh! Don't read my post... Blush | :O

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Re: Event trigger

D Shen19-Sep-02 8:16

D Shen

19-Sep-02 8:16

Yes, it is neat and does save me lots of typing Blush | :O

But if I would like to do little bit different for each text_changed event, how do I do? Can I attach more than one method for each event?

Thanks!!

Re: Event trigger

D Shen19-Sep-02 8:16

D Shen

19-Sep-02 8:16

Yes, it is neat and does save me lots of typing Blush | :O

But if I would like to do little bit different for each text_changed event, how do I do? Can I attach more than one method for each event?

Thanks!!

Re: Event trigger

Paul Riley19-Sep-02 9:28

Paul Riley

19-Sep-02 9:28

[All code in this message is untested]

D Shen wrote:
But if I would like to do little bit different for each text_changed event, how do I do? Can I attach more than one method for each event?

Yes, but it has to be done manually.

Go to the form constructor, right underneath TODO: Add any constructor code after InitializeComponent call and add something like the following:

this.textButtonX.TextChanged += new System.EventHandler(this.MySecondaryMethod);

However, be careful. If you attach two methods to one Delegate, I can't guarantee what order they will run in or even that they will run in the same sequence each time. A lot of testing is in order here.

Unless the extra code is unrelated and it doesn't matter which sequence you run in, it might be much safer to simply have a method that works like this:

private bool AllEmpty()
{
    return ((textBox1.Text.Length + textBox2.Text.Length + textBox3.Text.Length) == 0)
}

then use

button1.Enabled = !AllEmpty()

in three different event handlers.

Paul

Re: Event triger

Shaun Wilde19-Sep-02 11:14

Shaun Wilde

19-Sep-02 11:14

doesn't this cause the form to update on each text update?

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The end of future offspring.
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Re: Event triger

Paul Riley19-Sep-02 11:26

Paul Riley

19-Sep-02 11:26

Shaun Wilde wrote:
doesn't this cause the form to update on each text update?

On a web form: yes, in a manner of speaking, though you can skip the update code. Page_Load is called, which I think is your question.

On a windows form: no, it simply fires the TextChanged event. Form_Load is not called.

Paul

Re: Event triger

David Stone19-Sep-02 5:36

David Stone

19-Sep-02 5:36

You could iterate through the controls collection of the Form to find it for all the textboxes. I think this'll work:

bool validate = true;<br />
foreach(Textbox txt in this.Controls)<br />
{if(txt.Text = "") validate = false;}

if(validate) button1.Enabled = true;
That way, if any one of them is false, then your button doesn't get enabled. I'm sure there's a better way to do it though...

Your bullshit is so effusive I can smell it across oceans...
You impress no-one. You are a world-class sleazeball; an incomparable jerk. No-one is fooled by your idiotic attempts to slant votes.
-A. N. Onymous on Bill SerGio

Re: Event triger

leppie19-Sep-02 5:47

leppie

19-Sep-02 5:47

David Stone wrote:
bool validate = true;
foreach(Textbox txt in this.Controls)
{if(txt.Text = "") validate = false;}

That would work if only TextBoxes were on the form.

Rather:

foreach (Control ctrl in Controls){ TextBox txt = ctrl as TextBox; if (txt != null && txt.Text == "") validate = false; }

Give them a chance! Do it for the kittens, dear God, the kittens!

Re: Event triger

D Shen19-Sep-02 8:17

D Shen

19-Sep-02 8:17

leppie wrote:
foreach (Control ctrl in Controls){ TextBox txt = ctrl as TextBox; if (txt != null && txt.Text == "") validate = false;}

Thanks for the code. Do I still put the code in each text_changed event? Thanks!

Re: Event triger

leppie19-Sep-02 8:37

leppie

19-Sep-02 8:37

This wont really work unless u have only the 3 text boxes (other controls welcome)in question on the form Smile | :)

I was just trying to point out that u will get a cast exception if you dont check the type. I would definately go with the other option.

Assigned for all 3 ontextchanged events. Obviously, you will need some reset code as well.

if (tb1.Text == "" || tb2.Text == "" || tb3.Text == "" ) validate = false;

Or place the 3 textboxes in a panel Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!

DataBound WebControl

Shaun Wilde19-Sep-02 1:21

Shaun Wilde

19-Sep-02 1:21

Does anyone have a working example of a WebControl that supports DataBinding via its DataSource property.

I've tried the MS example and it doesn't work - cut&paste+compile.

I was also offered some code from an MS representitive on a newsgroup but even though it all works during design time it doesn't set the DataSource property at Runtime - I am assuming its missing a final step but I can't see what it could be.

MS example[^]

Google news thread[^]

I would also like to add a DataMember using the DataMemberConverter as well (and some DataFields using the DataFieldConverter for good measure) At the moment my code works fine but I can't bind to it nicely via the properties window.

Thanks

Shaun

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

Re: DataBound WebControl

James T. Johnson19-Sep-02 1:36

James T. Johnson

19-Sep-02 1:36

Just a thought; but when you tried the code he gave what was the assembly's filename?

It is important that the second part of this attribute Designer("DataSourceControl.MyDataDesigner,DataSourceControl") gives the name of the assembly it is defined in.

Whenever you see something declared as "Namespace.TypeName, AnotherName" you can probably assume that 'AnotherName' is supposed to be the name of the assembly (without the .DLL or .EXE).

James
"And we are all men; apart from the females." - Colin Davies

Re: DataBound WebControl

Shaun Wilde19-Sep-02 1:48

Shaun Wilde

19-Sep-02 1:48

I changed that line so that it matched my assembly name - as I said the designer works at design time - its just that the DataSource doesn't get bound to the dataset at runtime eventhough it is marked to so so in the HTML DataSource="<%# dsLanguages1 %>

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

Re: DataBound WebControl

James T. Johnson19-Sep-02 2:01

James T. Johnson

19-Sep-02 2:01

Ok, I see now that when I replied I thought the copy/paste+compile was for the code he gave you; not the example Blush | :O

I have zero experience in creating web controls and databinding so that was the only thing I could offer Frown | :(

James
"And we are all men; apart from the females." - Colin Davies

Re: DataBound WebControl

Shaun Wilde19-Sep-02 2:26

Shaun Wilde

19-Sep-02 2:26

actually it was for both - examples should be in straight from the tin format or it should be noted where changes should be made - I had to spend time to get them to work - it would have been easier if he has used typeof - instead of strings as it would be easier to see the errors. In the end I only had to change the designer lines in both examples - but still no dice Frown | :(

- glad for you input though

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

Re: DataBound WebControl

Shaun Wilde19-Sep-02 11:09

Shaun Wilde

19-Sep-02 11:09

sorted it - I overrode DataBind and didn't call the base class version - apparently it is the Base class implementaion that causes all the properties to be read in properly

public override void DataBind()
{
	base.DataBind(); // binds our properties
	myControl.DataBind(); // causes the list box to load
}

Stupidity dies.
The end of future offspring.
Evolution wins.
- A Darwin Awards Haiku

Beginner C# questions

vivosh197818-Sep-02 22:55

vivosh1978

18-Sep-02 22:55

1)What is the command to read int, double or other variables using microsoft
Library?
2)Anyone got good source codes(c#) for doing interactive forum using C#?
3) Any links to make good forum/messageboards using C#?

Thanks
Beginner
Vivian

Re: Beginner C# questions

leppie18-Sep-02 23:38

leppie

18-Sep-02 23:38

beginner_vivian wrote:
3) Any links to make good forum/messageboards using C#?

http://www.codeproject.com/script/comments/forums.asp?forumid=1649[^]

beginner_vivian wrote:
1)What is the command to read int, double or other variables using microsoft
Library?

Can you expand?

beginner_vivian wrote:
2)Anyone got good source codes(c#) for doing interactive forum using C#?

I'm still looking too...

Re: Beginner C# questions

James T. Johnson19-Sep-02 0:06

James T. Johnson

19-Sep-02 0:06

beginner_vivian wrote:
What is the command to read int, double or other variables using microsoft
Library?

Reading from where?

If you mean from the command line use Console.ReadLine to get a string representing what was typed (excluding the new line character(s)).

Then use the Convert classes to convert them to the type your are looking
for (you may have to parse the string to ensure it is what you think it is).

beginner_vivian wrote:
Anyone got good source codes(c#) for doing interactive forum using C#?

You mean a forum that is written with C# and that you can use on your website?

Microsoft has released the source to its ASP.NET forums[^], oddly enough on the ASP.NET forums page.

beginner_vivian wrote:
Any links to make good forum/messageboards using C#?

Just the one above Wink | ;)

James
"And we are all men; apart from the females." - Colin Davies

Re: Beginner C# questions

leppie19-Sep-02 0:31

leppie

19-Sep-02 0:31

James T. Johnson wrote:
ASP.NET forums

Nice link Smile | :)

DataGrid

vikramlinux18-Sep-02 18:03

vikramlinux

18-Sep-02 18:03

I am using Datagrid. In some columns I used comboboxxes and in rest textboxes by handling events . That meant I am placing the combobox ot text box on mouse click to appropriate cell.Here I want to avoid sorting.But even if I set allowsort property to false if not works.What can be the possible problem ? Confused | :confused:

VikramVS

Hanging web request

afronaut18-Sep-02 13:23

afronaut

18-Sep-02 13:23

Hey all - I'm trying to get an RSS feed using the System.Net.WebRequest class:

<br />
/* <br />
using System.Net;<br />
*/<br />
WebRequest requ = WebRequest.Create(feed);<br />
Stream instream;<br />
WebResponse result = requ.GetResponse();<br />
instream = result.GetResponseStream();<br />
StreamReader reader = new StreamReader(instream);<br />
String code="";<br />
while(code != null){  // <-- hangs in this loop<br />
code+=reader.ReadLine();<br />
}<br />

Unfortunately, it is hanging in my loop that retrieves all the text from the URL. Is there a better way to read all the text out of a feed? Also, does anyone know why it is an endless loop?

*->>Always working on my game, teach me
*->>something new.
cout << "dav1d\n";

Re: Hanging web request

Paul Riley18-Sep-02 13:31

Paul Riley

18-Sep-02 13:31

How is code ever going to be null if you're adding to it all the time?

You have to read into a temporary string, check for null and if it's not then add it to code. Alternatively, replace the entire loop with code = reader.ReadToEnd().

Paul

Re: Hanging web request

afronaut18-Sep-02 13:32

afronaut

18-Sep-02 13:32

As usual, I find an answer for everything I post for in moments. The StreamReader has a ReadToEnd method that can be used to get the entire contents of an InputStream.

I guess I'll leave my original post in case anyone else runs into something similar.

Big Grin | :-D

*->>Always working on my game, teach me
*->>something new.
cout << "dav1d\n";

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