Re: xmlns question - WPF Discussion Boards

Re: How to remember the position of a GridSplitter (I "SOLVED" IT MYSELF)

19-Jun-09 12:46

fjparisIII wrote:
Either I'm trying to do things that nobody knows the answer to or my questions are so stupid that people just laugh when they see them.

The traffic in this forum is pretty slow. However, there's a few people who are very good at WPF, and then there's me, who is doing his best. We'd all answer you, given a chance. Timezones mean you may need to wait a day.

You should use ActualWidth if it exists, rather than width. The preview events always fire, but the non preview events may not fire if something further up the tree consumes the event. Upshot is, I typically use the preview events only.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

fjparisIII19-Jun-09 13:55

fjparisIII

19-Jun-09 13:55

Christian Graus wrote:
You should use ActualWidth if it exists, rather than width.

ColumnDefinition.Width is not the same as UIElement.Width. The latter is a double, the former is a GridLength and doesn't work the same way as a UIElement.Width. You can't use ActualWidth to solve this problem.

Christian Graus wrote:
The preview events always fire, but the non preview events may not fire if something further up the tree consumes the event. Upshot is, I typically use the preview events only.

As I explained above, this is because a tunneling event is needed here, i.e. a Preview event.

Re: How to remember the position of a GridSplitter (I SOLVED IT MYSELF)

Christian Graus19-Jun-09 17:37

Re: xmlns question [modified]

19-Jun-09 17:37

fjparisIII wrote:
BTW, I never did get my answer on how to save a lossless rotation of a JPEG. This may be impossible with WPF (you probably could do it in that nightmarish WIC). Looks like I'm going to have to stoop to using the GDI+ .NET classes.

Well, if you read my blog, http://thingsihateaboutmicrosoft.blogspot.com/2009/06/wpf-destroys-images-when-resizing-them.html[^], I started my blog b/c you reminded me of that WPF resizing image bug. If they can't fix that, they are not going to add the sort of thing you wanted to do....

xmlns question

#realJSOP19-Jun-09 4:39

#realJSOP

19-Jun-09 4:39

If I define a namespace (xmlns) in app.xaml, does the whole application assembly see it, or do I have to redefine it in each xaml file from which I wish to use it?

"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
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Eslam Afifi19-Jun-09 6:29

Eslam Afifi

19-Jun-09 6:29

No. An XML namespaces binding scope is limited to the tag where they were defined[^]. I don't know whether XAML is XML v1.0 or v1.1 but a namespace binding attribute value cannot be empty.
And the first binding up the tree from where you use it is the one applied.

<StackPanel>
    <Grid xmlns:sys="clr-namespace:System;assembly=mscorlib">
        <Grid.Resources>
            <sys:Int32 x:Key="i">
                6
            </sys:Int32>
        </Grid.Resources>
    </Grid> <!-- mscorelib binding scope ends here -->

    <Grid xmlns:sys="clr-namespace:System;assembly=System">
        <Grid.Resources>
            <sys:Uri x:Key="uri">
                http://www.codeproject.com
            </sys:Uri>
        </Grid.Resources>

        <Grid xmlns:sys="clr-namespace:System;assembly=mscorlib">
            <Grid.Resources>
                <sys:Byte x:Key="b"> <!-- The binding used is mscorlib's -->
                    8
                </sys:Byte>
            </Grid.Resources>
        </Grid>
    </Grid>
</StackPanel>

There seems to be a problem displaying the code. Solved, the encode HTML option was disabled D'Oh! | :doh:

Eslam Afifi

modified on Friday, June 19, 2009 12:50 PM

Christian Graus19-Jun-09 11:45

19-Jun-09 11:45

That would make sense, right ? I'd also like to be able to define resources in one place and have them included through the project.

#realJSOP19-Jun-09 15:15

#realJSOP

19-Jun-09 15:15

Now you're just talking crazy...

Mark Salsbery21-Jun-09 7:47

Mark Salsbery

21-Jun-09 7:47

Christian Graus wrote:
That would make sense, right ?

No. You don't define namespaces in XAML.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Web browser application having database

SteveTheThread22-Jun-09 0:18

SteveTheThread

22-Jun-09 0:18

I am right in thinking you are refering to defining a namespace for e.g. a bunch of controls, and you wish to reference those controls in xaml using a (Xml) namespace rather than by code namespace and assembly, as in the example below (controls vs scm)

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
    xmlns:controls="http://schemas.xxx.com/wpf/xaml/controls">

To create your own (xml) namespace defintion, just done something like the following in you AssemblyInfo file

[assembly: XmlnsDefinition("http://schemas.xxx.com/wpf/xaml/controls", "xxx.Common.Controls")]
[assembly: XmlnsPrefix("http://schemas.xxx.com/wpf/xaml/controls", "controls")]

You can then use the xmlns definition in any xaml files that reference your controls project, but unfortunately, you can not use the xmlns defintition withn the project, eg. in a Resource dictionary within the project, which is understandable, but disappointing.

Rits11038918-Jun-09 21:34

18-Jun-09 21:34

I have to write an web browser application in WPF having database. I want to know if there are good sample database applications. I am looking for something like the sample on Microsoft SQL. I need all the basic functionality expected on line of business applications like master/detail or at least a similar functionality. Someone could please help me!

Christian Graus18-Jun-09 23:54

18-Jun-09 23:54

A SQL database isn't implimented any differently in WPF, compared to a winforms app. I need to know tho, why does your 'web browser application' need a database ?

#realJSOP19-Jun-09 0:11

#realJSOP

19-Jun-09 0:11

Christian Graus wrote:
I need to know tho, why does your 'web browser application' need a database ?

So he can properly catalog his inabilities.

Rits11038919-Jun-09 0:27

19-Jun-09 0:27

i need database because i want to store data from user and show the data to the user on demand Poke tongue | ;-P

Christian Graus19-Jun-09 11:00

19-Jun-09 11:00

What data ? Why ?

Rits11038919-Jun-09 0:24

19-Jun-09 0:24

I have problem that the database created in WPF web browser application cant open.It provides an error.
The following code is written in the page2.xaml.vb under the event button1_click of button1

imports system.data
imports syste.data.sqlclient

dim sqlconnection1 as new sqlconnection(my.settings.database1connectionstring)
dim dr as sqldatareader
dim sqlcommand1 as sqlcommand

try
sqlconnection1.open()
sqlcommand1=new sqlcommand("select FirstName from Table1",sqlconnection1)
dr=sqlcommand1.executereader()
while dr.read()
combobox1.items.add(dr(0))
end while
dr.close()
catch ex as exception
msgbox ex.message
end try
sqlconnection1.close()

THE ABOVE CODE GENRATE THE FOLLOWING ERROR AT RUNTIME
REQUEST FOR THE PERMISSION OF TYPE 'system.sqlclient.sqlclientpermission,system.data,version=2.0.0.0,culture=neutral,publickeytoken=b77a5c561394e089 failed.

please tell me what should i do.

thanks in advance...... Big Grin | :-D

Christian Graus19-Jun-09 10:59

19-Jun-09 10:59

Try here[^]

Rits11038920-Jun-09 1:27