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I'm building my own WPF control. Once added to a Window in design mode the control needs to set some of its properties dynamically based on the Window. In code behind I'm doing this:
Foo = "Some dynamic Value";
So I don't loose the new value I want the XAML updated to:
< providercontrol x:name="Control1" foo="Some dynamic Value" >
Much to my dismay the XAML isn't updating. So far my attempts at this will update the property value in the Properties window but the XAML remains unchanged. Without saving my change to the XAML the value is lost when the Window is closed.
How can I change a property inside the control and have the XAML reflect that?
modified on Tuesday, July 22, 2008 7:18 PM
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I'm a bit confused by your question. What exactly are you expecting to see changed in the XAML?
Jammer
Going where everyone here has gone before! 
My Blog
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If I change a property from it's default I expect that change to be reflected in the XAML. Currently it is not. I change a property on the control and the XAML the doesn't change at all.
I want to see the XAML updated just the same as if I updated a property on the control using the Properties window.
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Which properties window? Visual Studio? Expression Blend?
Which properties are you changing? What control are you working with?
Jammer
Going where everyone here has gone before!
My Blog
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Sorry, I'm working with Visual Studio. I'm writing my own User control. While that control is running in design time it's going to collect some information such as its parent window code file location. So once the control is placed on the window it is going to fill in my custom string property ParentWindowPath.
Once my property ParentWindowPath changes from its default, that new value should show up in the XAML. However, the XAML never sees the change.
Now if I select my control on the designer, the Visual Studio Properties window does display the new value. From this know my property is being correctly set.
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I've never seen XAML 'change' ... irrespective of what properties I set in C# ...
Are you expecting to see something like MyCustomPropertyName="" become MyCustomPropertyName="C:\windowlocation\window.xaml.cs" in your XAML file??
Have a read of this:
http://msdn.microsoft.com/en-us/library/ms753197.aspx[^]
Jammer
Going where everyone here has gone before!
My Blog
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Jammer wrote:
Are you expecting to see something like MyCustomPropertyName="" become MyCustomPropertyName="C:\windowlocation\window.xaml.cs" in your XAML file??
Yep, that's exactly what I'm shooting for. It's also exactly the behavior I see if I change MyCustomPropertyName="" to MyCustomPropertyName="C:\windowlocation\window.xaml.cs" using the Properties window.
Since my changes in c# show up in the Properties window I expected them to show up in the XAML as well.
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I'm not sure I understand this. You're trying to use a computer to record some sort of value for you? and this virtual studio ZHAMEL that you make refernce to, this contains properties and values vis a vis teh interwebs? I have additional questions for you in order for me to help you. I should mention that I've never seen a computer do this before.
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Hi there Mr. Mountain........ I've got a thread flying straight toward you......
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XAML doesn't do this ...
Jammer
Going where everyone here has gone before!
My Blog
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To have your C# code change XAML properties at design time you need to create a separate DLL that talks specifically to the designer for your control. This DLL needs to be named [control name].VisualStudio.Design.Dll and deployed wherever your control.dll is.
Example:
internal class Metadata : IRegisterMetadata {
public void Register() {
AttributeTableBuilder builder = new AttributeTableBuilder();
builder.AddCustomAttributes(typeof(Button), new FeatureAttribute(typeof(TaskProvider)));
MetadataStore.AddAttributeTable(builder.CreateTable());
}
}
class TaskProvider : Microsoft.Windows.Design.Interaction.PrimarySelectionTaskProvider
{
public TaskProvider()
{
}
protected override void Activate(Microsoft.Windows.Design.Model.ModelItem item)
{
if (String.IsNullOrEmpty((String)item.Properties["StringProperty"].ComputedValue))
item.Properties["StringProperty"].SetValue(Guid.NewGuid().ToString());
base.Activate(item);
}
}
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Hello Friends,
I have a IList collection which consists of IList collection how can i bind them in wpf and get the data...
eg: I have a Ilist<patient> pat
this patient class consists of firstname, lastname and Ilist add.
so now i want to bind the pat to list box and the list box should even display the values of the add IList....
can any one find solution for this.....
cheers
chandu
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I must use only one object data provider in my wpf window. I have two methods that return two collections in code-behinded file. How can I bind those two methods to datagrid? (I'm using third-party datagrid but I think that the binding will be the same.) If I use the methodname in object data provider, i'm able to bind the datagrid. but I want to use one method for one datagrid..
// xmlns:igDP="http://infragistics.com/DataPresenter"
...
<Grid>
<Grid.Resources>
<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
/>
</Grid.Resources>
......
<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod1}">
</igDP:XamDataGrid>
if I do like that, it will work..
<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
MethodName="GetDataMethod1"/>
I want something like that below but it doesn't work.
<Grid>
<Grid.Resources>
<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
/>
</Grid.Resources>
......
<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid1"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod1}">
</igDP:XamDataGrid>
<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid2"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod2}">
</igDP:XamDataGrid>
Any idea? Thanks in advance.
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
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Could the two methods not do the binding instead of the XAML? As far as I know (which isn't far I admit !) an ObjecDataProvider can only execute one method.
Jammer
Going where everyone here has gone before! 
My Blog
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Thanks. I will export two public properties and use it in datagrid. Thanks again for your reply, Jammer.
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No problem, the xamDataGrid is a great control.
Jammer
Going where everyone here has gone before!
My Blog
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DragSource is not an event. It's a UIElement of some kind.
The author doesn't show how it's defined in his sample code
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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Oh for goodness sake ... I've gone and made an arse of myself in public AGAIN!
I really shouldn't be trying new things on a Sunday afternoon after a large meal and a few pints ... all the blood is in my stomach! 
Jammer
Going where everyone here has gone before!
My Blog
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Hello people!
I am a bit new to WPF (worked with WinForms till now). What am I trying to do is a sort of texture mapping.
When I was warking with WinForms I was using Directx SDK.
In my program I am getting a byte array that represents pixels in RGB format. for example byte[] arr = {r1,b1,g1,r2,b2,g2...rn,bn,gn};
So each 3 array cells represent one pixel. Then I was creating a MemoryStream. I had pre-written BMP file header, so I just write my header into the stream and then write my array there as well. So now I've got a Stream that represents a BMP image.
Now I've got my image in the stream. Then, in WinForms+ DirectX SDK I was creating a triangle primitive and was drawing my BMP image on this primitive ( texture mapping);
Now I want to do the same thing in WPF. I still have my byte[] arr ;
Here is the code of what I've done:
First of all this is my "Primitive class"
class PpiSegment : ModelVisual3D
{
MeshGeometry3D segmentMesh;
DiffuseMaterial segmentMaterial;
BitmapImage segmentTexture;
ImageSource segmentTextureSource;
ImageBrush segmentBrush;
// I get 3 points coordinates in the Constructor
public Segment(Point3D leftPoint, Point3D rightPoint, Point3D middlePoint)
{
segmentMesh = new MeshGeometry3D();
segmentMaterial = new DiffuseMaterial();
segmentTexture = new BitmapImage();
segmentBrush = new ImageBrush();
this.Content = new GeometryModel3D();
(this.Content as GeometryModel3D).Geometry = CreateTriangleCoords(leftPoint, rightPoint, middlePoint);
}
/* middle(center)
* /\
* / \
* / \
* / \
* left -------- right
*
*/
internal Geometry3D CreateTriangleCoords(Point3D leftPoint, Point3D rightPoint, Point3D middlePoint)
{
segmentMesh.Positions.Add(leftPoint);
segmentMesh.Normals.Add((Vector3D)leftPoint);
segmentMesh.TextureCoordinates.Add(new Point(1.0, 1.0));
segmentMesh.Positions.Add(rightPoint);
segmentMesh.Normals.Add((Vector3D)rightPoint);
segmentMesh.TextureCoordinates.Add(new Point(1.0, 1.0));
segmentMesh.Positions.Add(middlePoint);
segmentMesh.Normals.Add((Vector3D)middlePoint);
segmentMesh.TextureCoordinates.Add(new Point(0.0, 0.0));
segmentMesh.TriangleIndices.Add(2);
segmentMesh.TriangleIndices.Add(1);
segmentMesh.TriangleIndices.Add(0);
segmentMesh.Freeze();
return segmentMesh;
}
-----------------------------------------------------------------------------------------------------------
and now to the interresting part:
Here I am giving a BMP stream as an Image for the Brush.
//This Stream WAS INITIALIZED Before.
public Stream bitmapStream = new MemoryStream();
//On the first run of my class I call for this function to initialize the "StreamSource" parameter of
"segmentTexture"
public void SetTexture()
{
segmentTexture.BeginInit();
segmentTexture.StreamSource = bitmapStream;
segmentTexture.EndInit();
segmentTextureSource = segmentTexture;
segmentBrush.ImageSource = segmentTextureSource;
segmentMaterial.Brush = segmentBrush;
(this.Content as GeometryModel3D).Material = segmentMaterial;
this.Transform = new TranslateTransform3D(0.0, 0.0, 0.0);
}
Ok, I've got my image loaded. BUT! Now I need to change the image!
So I create somewhere a NEW stream and I amtrying to pass it like I did it before..
public void SetNewTexture(Stream newStream)
{
//I dont need Init/EndInit functions any more... (Don't I?)
segmentTexture.StreamSource = newStream;
segmentTextureSource = segmentTexture;
segmentBrush.ImageSource = segmentTextureSource;
segmentMaterial.Brush = segmentBrush;
(this.Content as GeometryModel3D).Material = segmentMaterial;
this.Transform = new TranslateTransform3D(0.0, 0.0, 0.0);
}
}
But! When I do that NOTHING happens... Image on my triangle primitive doesnt change...
-------------------------------------------------------------------------------------------------------------------------------
Here How I use my Segment class.. maybe its the problem....
class SegmentsBuilder
{
private ModelVisual3D _mv3D;
public PpiSegment[] segmentsArray;
//I am getting a "modelVisual3D" parameter from Window1.xaml
public SegmentsBuilder(ModelVisual3D modelVisual3D)
{
_mv3D = modelVisual3D;
segmentsArray = new PpiSegment[General.numberOfSegments];
}
//I am creating a circle from some number of triangles with textures on them
public void BuildSegments()
{
Point3D leftPoint, rightPoint, middlePoint;
double theta = MathHelper.DegToRad(360.0 / General.numberOfSegments);
double R = 0.95;
middlePoint = new Point3D(0.0, 0.0, General.ppiZCoordinate);
// create a list of triangles
for (int i = 0; i < General.numberOfBeems; i++)
{
//left
leftPoint = new Point3D();
leftPoint.X = R * Math.Cos((double)(i + 1) * theta);
leftPoint.Y = R * Math.Sin((double)(i + 1) * theta);
leftPoint.Z = General.ppiZCoordinate;
//right
rightPoint = new Point3D();
rightPoint.X = R * Math.Cos((double)(i) * theta);
rightPoint.Y = R * Math.Sin((double)(i) * theta);
rightPoint.Z = General.ppiZCoordinate;
segmentsArray[i] = new PpiSegment(rightPoint,leftPoint, middlePoint);
_mv3D.Children.Add(segmentsArray[i]);
}
}
public void UpdateTexture(int segment, Stream texture)
{
segmentsArray[segment].SetNewTexture(texture);
}
So here are my questions...
1)What do I do wrong? Why nothing happens over there?...
2)As I said before I am WPF noobie, so maybe there is another way of doing texture mapping, or doing my task (drawing a bitmap on the triangle)
Any help/ideas/opinions are really welcome... :]
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Am I right in understanding that the bitmap was visible but did not change when you updated the bitmap?
I tried using a MemoryStream and only got it to change by recreating the BitmapDecoder and setting the ImageSource each time, even though it was set not to cache the result.
I also tried using WriteableBitmap in that case just changing the ImageSource on the ImageBrush was enough for it to update. The WriteableBitmap class is improved in 3.5 sp1 and allows access via pointers (don't for get to use AddDirtRect). You can also just write the whole array if you want.
If your not not updating the bitmap I may have misunderstood, if it doesn't show up at all I would check the texture coordinates and test by setting the BackMaterial to a SolidColor. You may also want to check if any of the materials, images e.t.c are Frozen.
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thank you very much! You did understand me right, it just wasnt updating The WriteableBitmap is the solution ;]
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Hi all,
I m new to WPF. I m developing one application in which i want to read XAML file and iterate thru each control element and find the name and value of that control and write to another xml file.
So kindly need yr suggesion..
Thanks
Krishnraj
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