Copy TreeViewItem WPF .NET 4.0 - C# Discussion Boards

#realJSOP9-Feb-11 5:41

#realJSOP

9-Feb-11 5:41

You missed the point entirely.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

Member 216810325-Feb-11 3:35

Member 2168103

25-Feb-11 3:35

what do you mean?
first i got books but my understandings in english isnt the best and thats also why it can be difficult for me to understans, so pls explain what i missed???

Pete O'Hanlon9-Feb-11 1:01

9-Feb-11 1:01

Of course it displays the document in the listview. You add it in before you even attempt the download. Looking at your code, it appears from a cursory glance that you are closing your response stream before it has a chance to download the files.

Also, as Luc has said, it's an extremely bad idea to consume exceptions - never, ever, put in code that says catch { } without a good reason (there are some cases where you can get away with this, but they are the exception rather than the norm).

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Luc Pattyn9-Feb-11 1:32

Luc Pattyn

9-Feb-11 1:32

Pete O'Hanlon wrote:
never, ever, put in code that says catch { } without a good reason

and, if and when there is such good reason, explain it in all its glory in a comment, so the catch block holds something useful.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Pete O'Hanlon9-Feb-11 2:17

9-Feb-11 2:17

Indeed.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Copy TreeViewItem WPF .NET 4.0

#realJSOP9-Feb-11 5:42

#realJSOP

9-Feb-11 5:42

Word up.

Mc_Topaz8-Feb-11 23:02

Mc_Topaz

8-Feb-11 23:02

I try to copy a TreeViewItem with all of it's items from a TreeView. When I try to paste it in the same TreeView but in an other location, I stumble on an error. This is my sample of the relevant code:

Some usefull datatypes

TreeView tvFolders;         // The TreeView object
TreeViewItem bufferFolder;  // A buffer object to store the copied TreeViewItem in

The method to copy the selected TreeViewItem

private void Copy(object sender, RoutedEventArgs e)
{
    if (tvFolders.SelectedItem == null)
        return;

    bufferFolder = tvFolders.SelectedItem as TreeViewItem;
}

The method to paste the selected TreeViewItem

private void Paste(Object sender, RoutedEventArgs e)
{
    if (bufferFolder == null || tvFolders.SelectedItem == null)
        return;

    TreeViewItem selectedFolder = tvFolders.SelectedItem as TreeViewItem;
    selectedFolder.Items.Add(bufferFolder);
}

When I try to execute the selectedFolder.Items.Add(bufferFolder); instruction in the Paste() method, I get an InvalidOperationException with this following message:
"Element already has a logical parent. It must be detached from the old parent before it is attached to a new one."

The only way I know to "detach" the TreeViewItem is to remove it in Copy() method. But doing that actually redesigns the Copy() method to my Cut() method. That is not what I want, but it makes the Paste() method to work D'Oh! | :doh:

I have tried several ways to copy the TreeViewItem with: "deep copy", "shallow copy", a derivided class of TreeViewItem with Serializable attribute and ISerializable interface as well as using the ICloneable interface but I have not had any luck.

Any suggestions for a soluation?

Re: Copy TreeViewItem WPF .NET 4.0

Pete O'Hanlon9-Feb-11 1:11

9-Feb-11 1:11

You are approaching the problem in the wrong way. Basically, what you need to do is to take a copy of the data that makes up the TreeViewItem that you are interested in, and add this into the relevant location instead. As you have found, each element can only have one parent (the Visual and Logical Trees are tree structures after all), and it takes some extreme hackery to accomplish the "reparenting". By doing things the MVVM way instead, you will make things a lot easier on yourself.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Re: Copy TreeViewItem WPF .NET 4.0

Mc_Topaz9-Feb-11 1:38

Mc_Topaz

9-Feb-11 1:38

Yes, I thought I was approaching this in a wrong way.

But how do I copy of all data that is within each TreeViewItem?
It's rather tidious to pass all properties to a new instance of a TreeViewItem from the one I would like to copy/clone.

Any example?

Re: Copy TreeViewItem WPF .NET 4.0

Pete O'Hanlon9-Feb-11 2:11

9-Feb-11 2:11

Funnily enough, yes[^].

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

How to send files with http protocol between 2 pc or many

Video Streaming

Rei ho8-Feb-11 18:27

Rei ho

8-Feb-11 18:27

Is it possible to do Video streaming using C# handler
Expression blend 4 with VS2010 C# handler

Re: Video Streaming

Abhinav S8-Feb-11 18:51

Abhinav S

8-Feb-11 18:51

It is quite possible. If you are using Expression Blend 4 I assume you are using WPF or Silverlight.
Video streaming is possible in both WPF and Silverlight.

See here[^] for a simple example.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Re: Video Streaming

Rei ho8-Feb-11 19:35

Rei ho

8-Feb-11 19:35

i am looking for something that is able to stream a video from for example,

i uploaded this video onto the server
www.xxxxx.com/video.wmv

how do i stream it on click event handler, for it to stream this specific video onto the media element on expression blend 4

omercansasal8-Feb-11 3:52

omercansasal

8-Feb-11 3:52

I am developing file transfer program on C#.I want to use http protocol but don't know how?

Re: How to send files with http protocol between 2 pc or many

Luc Pattyn8-Feb-11 3:56

Luc Pattyn

8-Feb-11 3:56

you could turn at least one machine into a web server, see e.g. this article: http://www.codeproject.com/KB/IP/CSHTTPServer.asxp[^].

And all machines could be web clients, based on either a WebBrowser Control, or the WebClient class, or the HttpRequest and HttpResponse classes.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: How to send files with http protocol between 2 pc or many

omercansasal8-Feb-11 4:16

omercansasal

8-Feb-11 4:16

thanks a lot..if you know the another link,program or source, please share it Confused | :confused:

Re: How to send files with http protocol between 2 pc or many

Luc Pattyn8-Feb-11 4:20

Luc Pattyn

8-Feb-11 4:20

you're welcome.
MSDN holds all the information on the classes I mentioned.
And I suggest you look around for more articles here on CodeProject, and don't forget to use Google.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

adding a custoncontrol to a form in .net CF .

prasadbuddhika8-Feb-11 0:10

prasadbuddhika

8-Feb-11 0:10

i'm doing this in the .net CF 3.5.

i created a custompanel inherited by form.panel. but when trying to dock the custompanel into form at runtime , i set it's Dock property
to DockStyle.fill, but still the custompanel adds to the form with the small size(100,100). and the onresize event is fired.

any idea how to handle this

thanx in advance.

Re: adding a custoncontrol to a form in .net CF .

Not Active8-Feb-11 2:30

Not Active

8-Feb-11 2:30

You may get a better response by posting this in the Mobile forum

I know the language. I've read a book. - _Madmatt

my mysql database string connection

Pierre besquent7-Feb-11 22:42

Pierre besquent

7-Feb-11 22:42

hello,
I deveopped a web application with Visual Studio 2008.My database is elaborated with Navicat 8 for Mysql.
I want to connect to my db.I have this connection string;

string ConnectionString= "Driver={Navicat 8 for MySQL};" 
		+ "Server=localhost:3306;" + "Database="+informations+";" + " UID=root;" + "PASSWORD=root";

when I run,it show me this error:
"informations doesn't exist in the current context",informations is my database's name.
I think that I miss to add connection from my project(Tools--->connect to database"),this doesn't show any thing to help me because i couldn't add my database.
Someone to help me is so grantful
ty Smile | :)

Re: my mysql database string connection

OriginalGriff7-Feb-11 23:07

OriginalGriff

7-Feb-11 23:07

What it is saying is the the variable "informations" does not exist in the current method as a local variable, or as a parameter,and that it does not exist at the class level either.

Have you recently moved the code from one method to another?

Or should "informations" be inside the string:

string ConnectionString= "Driver={Navicat 8 for MySQL};" 
		+ "Server=localhost:3306;" + "Database=informations;" + " UID=root;" + "PASSWORD=root";

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Digital man: "You are, in short, an idiot with the IQ of an ant and the intellectual capacity of a hose pipe."

Attempt to bump post

Pete O'Hanlon7-Feb-11 23:48

7-Feb-11 23:48

Please don't attempt to bump your post. It's disrespectful.

Original post here[^].

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads