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Hi Mark,
Even I read the same in many forums but Recently i have downloaded an application as such and just as i could upload those images i couldnt show you here.
Any how thanks for your reply and i will get back on this once after having any idea in this regards
<b>Thanks </b>
Seshu
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Overview
WPF Project (VS 2008)
I'm using a ListView (with GridView) bound to an ObservableCollection. The collection includes a DateTime field.
When I populate the collection, the DateNR field is often null, but then the ListView displays a date of "01-Jan-01"!!
How do I stop this as I don't want the user to see a date when there shouldn't be one. I need the DateNR field in the collection to be a DateTime value not a string because this column is used for sorting.
Any ideas would be welcome. thanks
<br />
public class RecordData<br />
{<br />
public int ID { get; set; }<br />
public DateTime DateNR { get; set; }<br />
}<br />
The GridView column for 'DateNR' is specified as follows:
<br />
GridViewColumnHeader gvch = new GridViewColumnHeader();<br />
GridViewColumn gvc = new GridViewColumn();<br />
Binding bind = new Binding("DateNR");<br />
bind.Converter = new FormattingConverter();<br />
bind.ConverterParameter = @"{0:dd-MMM-yy}";<br />
gvc.Width = 80;<br />
gvc.DisplayMemberBinding = bind;<br />
gvch.Content = "NR Date";<br />
gvc.Header = gvch;<br />
myGridView.Columns.Add(gvc);<br />
<br />
SqlConnection sqlConn = new SqlConnection(myConnectionString);<br />
SqlCommand sqlComm = new SqlCommand("...", sqlConn);<br />
SqlDataReader sqlDR = sqlComm.ExecuteReader();<br />
RecordData rd = new RecordData();<br />
rd.ID = sqlDR.GetInt32(0);<br />
if (sqlDR.IsDBNull(1) == false)<br />
rd.DateNR = sqlDR.GetDateTime(1);<br />
_MyCollection.Add(rd);<br />
modified on Saturday, September 19, 2009 5:46 AM
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Hi all.
Can we use XNA physic engines in WPF (2D) ? Is it possible ?
Thanks.
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I almost never write strongly worded posts, but I feel this one is warranted. So I'll go out on a limb and say:
VS2008's ability to reliably update service references in a Silverlight class library project is little more than a crap shoot. The feature is hopelessly broken and has all the appeal of a steaming pile of horse manure. It's a waste of my time to have to exit Visual Studio, reboot, pray or do all of the above in the hope that the reference will actually be imported correctly this time.
Microsoft, if you want developers to seriously consider using Silverlight, I urge you to release a hotfix that addesses this problem. It would be faster to rearchitect our enterprise application's front end in Flash than continue wasting valuable time trying (in vain) to get this to work.
/ravi
Update: Bug 439157[^] filed.
modified on Saturday, May 2, 2009 5:01 PM
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Thanks for filing a bug on Connect!!
I was going to recommend you do that
Also, this is a Visual Studio issue, not a Silverlight issue, so this was
the wrong board to post on
Cheers,
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: Also, this is a Visual Studio issue, not a Silverlight issue,
OK, but it only affects adding a service reference to a Silverlight assembly.
/ravi
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FYI, I've managed to repro the badness and have tracked down what I believe is the offending situation. I'll update the bug report when I have cycles.
/ravi
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Can anyone tell me how to fill a TreeView with items from an Access database in WPF? I've already added my data source; Data >> Add New Data Source in Visual Studio 2008. So my dataset and table adapters are all set up already, just need to get the data into the TreeView. Here's an example of what my tree structure looks like:
>Parts
>Tables
>Top
>Leg
>Chairs
>Seat
>Leg
>Backrest
Table Top, Leg, etc are stored in a 'Parts' table, from which I want to read data.
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This[^] should help.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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How do I create a UserControl which can host other controls? For example, say I wanted to create a UserControl which showed an orange border but could have other controls hosted inside it so:
<my:OrangeBorderThing>
<TextBlock>hello</TextBlock>
</my:OrangeBorderThing>
would show the word "hello" surrounded by an orange border - currentlly I just get the word hello - I have spent a couple of hours reading the usual conflicting things google brings up, messed about with ControlTemplate and ContentPresenter etc but have gotten nowhere.
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<Window x:Class="Wpf2.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Wpf2"
Title="Window1" Height="300" Width="300">
<Grid>
<local:UserControl1 />
</Grid>
</Window>
<UserControl x:Class="Wpf2.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="100" Width="200">
<Grid>
<Border BorderBrush="red" BorderThickness="2">
<TextBlock Text="Hello" />
</Border>
</Grid>
</UserControl>
It woks for me.
Best regards
Agha Khan
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That's not the way it works. What you want is a Style that has your border settings in it, like this:
<Style TargetType="{x:Type Border}" x:Key="MyBorder">
<Setter Property="Background" Value="#E7E3ED" />
<Setter Property="BorderBrush" Value="Black" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="CornerRadius" Value="8,8,8,8" />
</Style>
and then do this in your UserControl:
<Border Margin="0,31,0,0" Width="222" Height="32" HorizontalAlignment="Left"
VerticalAlignment="Top" Style="{DynamicResource UDPBorder}">
<TextBlock>Hello</TextBlock>
</Border>
"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
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The TextBlock with the content=Hello is just as an example - it could be a grid with lots of other controls inside it. Basicaly I want to write a control that can host other controls. Maybe I am not explaining myself very well - having spent a while on this, tapping random stuff into Google, any sense of what it is I wanted and how to express it has probably been lost.
I think a lot of the problem with this stuff is years ago if you wanted to know what a keyword did in a programming language and how to use it you would look it up in the manual. These days programming language keywords are of little consequence, it's all about the libraries but if you don't know what to look for where exactly do you look?
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Dear John Simmons / outlaw programmer:
Would you please kind enough to look a problem which I posted? All necessary code is there to build the application.
Is this bug is in animation?
Best regards
Agha
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A better question would be if you even need to make a UserControl. The built in Border control is capable of holding a control as is. If all you are trying to do is have a way to make orange borders, you should just define a style like John suggested and apply it to any borders you want to be orange.
<StackPanel>
<Border Style="{StaticResource OrangeBorderStyle}">
<TextBlock>Hello</TextBlock>
</Border>
<Border Style="{StaticResource OrangeBorderStyle}">
<Grid>
<!-- your controls here -->
</Grid>
</Border>
</StackPanel>
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Would you please kind enough to look "Is this bug in animation?" my problem?
All necessary code is there to build application.
Many thanks
Agha Khan
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Don't post in other threads to try to get people to answer your question.
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You are correct. Thank you to put me in right direction.
Best regards
Agha Khan
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The orange border is of no consequence, it was just as an example. I want a user control which can also host other controls - an item container.
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Try looking at ContentControl (or derived class) along with a style or control template first to see if can meet your needs. If that doesn't work, just create something that derives from ContentControl.
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I just got through accomplishing this very thing, building a spin control out of a TextBox and vertical ScrollBar, wrapped in a StackPanel. I needed to have spin controls all over the place in my application so I needed a first class UserControl. I just followed the description given in Mathew MacDonald's excellent book, Pro WPF in C# 2008, pp. 858-866. Sure, I wound up with a source file that is over 400 lines long, but considering the payback, the effort was more than worthwhile. Once you've gone through an exercise like this, the rocket science is transformed into the routine and the sky is the limit.
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Hi,
I've got a simple ServiceContract as follows:
[ServiceContract]
public interface ITestContractCallback
{
[OperationContract(IsOneWay = true)]
void CallBackFunc();
}
[ServiceContract(CallbackContract=typeof(ITestContractCallback))]
public interface ITestContract
{
[OperationContract(IsOneWay = false)]
ulong GetValue();
}
My server code looks like this:
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
public class Server : ITestContract
{
public static ITestContractCallback _callback;
public Thread _callbackHammererThread;
public Server()
{
_callback = OperationContext.Current.GetCallbackChannel<ITestContractCallback>();
_callbackHammererThread = new Thread(CallbackHammererThread);
_callbackHammererThread.Start();
}
public static void CallbackHammererThread()
{
while (true)
{
if (_callback != null)
{
_callback.CallBackFunc();
}
Thread.Sleep(1);
}
}
#region ITestContract Members
public ulong GetValue()
{
return 100000;
}
#endregion
}
class Program
{
static void Main(string[] args)
{
NetTcpBinding binding = new NetTcpBinding();
ServiceHost host = new ServiceHost(typeof(Server));
Uri BaseAddressString = new Uri("net.tcp://localhost:1337/test");
host.AddServiceEndpoint(typeof(ITestContract), new NetTcpBinding(), BaseAddressString);
host.Open();
Application.Run();
host.Close();
}
}
And I've written a noddy WPF Application which connects to this server and, when a button is pressed displays the value of 'GetValue()' in a field. This works fine if I disable the CallbackHammererThread in the server but when it's continually hitting the callback on the client, my call to 'GetValue()' just freezes the whole GUI until the WCF TCP connection times out and throws an exception.
Debugging and using wireshark I can see that the server gets the call and returns the response but I can't figure out how to fix the deadlocking that appears to be caused in the client thread.
Can anyone help? This is occuring in a larger WPF + WCF appliction I'm currently working on and I'm finding it impossible to work out.
Thanks
Richard
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I`ve got some problems with understanding how dependecy properties work so for sure smbd can explain it to me little better.
Let`s imagine simple GUI hierarchy Button:UIElement
class UIElement
{
public (DependecyProperty)static Font font;
}
I especially simplified this,but for me the keyword here is STATIC.
class Button:UIElement
{
private Font buttonfont;
public Button()
{
buttonfont=UIElement.font;
}
public Font GetFont()
{
return buttonfont;
}
public SetFont(Font font)
{
buttonfont=font;
}
}
So i`ve read somewhere that dependecy properties needed for performance and resource managment.
And the example was Form with Buttons
So let`s imagine Form with 10 Buttons
1.If no explicit SetFont invoked then 1 Font object needed.
Totally the same thing could be done with WindowsForms declaring global Font object(probably static)
2.If someone invokes,for example SetFont(Color.Random) then numberOfObjects=SetFontInvocations+1(for example)
{if we use ONLY Color.SomeColor to set colors, then no new objects created in any part of code,because Color enumeration exists and all colors automaticaly created)
And again the same situations with WindowsForms
So if it`s possible could you pls show where WPF can improve resource managment in this simple situation.
Thank you all for helping.
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It seems that you have some misconceptions about dependency properties. They are definitely not needed for performance (as regular properties backed by regular fields would probably be better than that), but they do have several advantages that make them useful on UI objects. I refer you to the MSDN Documentation on the subject:
MSDN wrote: The purpose of dependency properties is to provide a way to compute the value of a property based on the value of other inputs. These other inputs might include system properties such as themes and user preference, just-in-time property determination mechanisms such as data binding and animations/storyboards, multiple-use templates such as resources and styles, or values known through parent-child relationships with other elements in the element tree.
I would suggest reading the whole article (and perhaps some of the linked to articles) to get a good sense of what dependency properties are for and how they are used.
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This is probably embarrassingly simple to accomplish but in researching and researching I can't find the answer.
I've captured the BitmapMetadata from the image file I'm transforming. Then I have successfully used TransformBitmap and ScaleTransform to scale from and to any of the six image formats supported by WPF, all without a hitch -- except one hitch which I knew I would have to deal with after getting the basic scaling mechanism working. The problem is getting the metadata transferred from the source image files to the destination image files.
There are Metadata properties in all six encoders but when I try to assign the metadata from the original image I get an exception complaining, "The designated BitmapEncoder does not support global metadata." Is "non-global metadata" a BitmapFrame? That only has a "get" property, no "set". That's the problem with all the speculations I've come up with to solve this problem: you can't assign a BitmapMetadata object to the Metadata property of any BitmapSource-derived class that I've been able to find. Looking for a solution in that direction just leads me up blind alleys.
A related issue is that I've read that when creating a new image from existing bitmap data, if you want metadata in the image, it has to be added before the bitmap data. But I haven't been able to figure out how to do that, either.
I have several books on WPF. None of them get remotely near to dealing with these issues, as fundamental as they are.
So what is the solution? It's got to be embarrassingly simple and I'm going to kick myself when I see it, but I'll be eternally grateful to anyone who supplies me with the answer.
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