Border.Child - System.ArgumentException and System.AccessViolationException : The Official Microsoft Silverlight Site

03-12-2008 1:41 PM

Border.Child - System.ArgumentException and System.AccessViolationException

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Hi,

Using SL2B1 with C# (and IE7), the Border control will throw an exception if the Child property is set to the same object twice.

Example:

UserControl A;
UserControl B;

myBorder.Child = A; //OK
myBorder.Child = B; //OK
myBorder.Child = B; //Exception

An exception of type 'System.ArgumentException' occurred in System.Windows.dll but was not handled in user code
Additional information: Value does not fall within the expected range.

Also along these lines, setting Child to null produces another exception,

myBorder.Child = null;

An exception of type 'System.AccessViolationException' occurred in System.Windows.dll but was not handled in user code
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Cheers

UncleRedz

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Joined on 03-06-2008
Posts 7

03-14-2008 9:03 PM

Re: Border.Child - System.ArgumentException and System.AccessViolationException

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Thank you for reporting this. We have logged it at our end and are investigating it.

Pranav Goel - MSFT

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Joined on 03-14-2008
Redmond, WA
Posts 3

04-21-2008 4:02 PM

Re: Border.Child - System.ArgumentException and System.AccessViolationException

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Is there a workaround yet? or a fix? I have a similar problem adding a new self defined XAML User Control to a Canvas, it gives me:

An exception of type 'System.ArgumentException' occurred in System.Windows.dll but was not handled in user code

Additional information: Value does not fall within the expected range.

public void timeToXAML(SA11Demo2.Selector.Course course,Canvas destination, int x, int y)

{

Course newCourse = new Course(course.cName, x, y, course.ccID, 1);

destination.Children.Add((Course)newObj);

}

Here are the course classes....

//---- Course.cs ------

using System;

using System.Collections.Generic;

using System.Linq;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

namespace SA11Demo2

{

public partial class Course : UserControl

{

public string Id { get; set; }

bool startDrag = false;

public Course(string id, double x, double y, string courseCode, int type) //where type= Lec/Lab

{

InitializeComponent();

// add eventhandlers

CourseRec.MouseEnter += new MouseEventHandler(CourseRec_MouseEnter);

CourseRec.MouseLeave += new MouseEventHandler(CourseRec_MouseLeave);

CourseRec.MouseLeftButtonDown += new MouseButtonEventHandler(CourseRec_MouseLeftButtonDown);

this.MouseLeftButtonUp += new MouseButtonEventHandler(Course_MouseLeftButtonUp);

this.MouseMove += new MouseEventHandler(Course_MouseMove);

// give a value to the properties

this.Id = id;

this.ccID.Text = courseCode;

//this.cName.Text = courseName;

this.type.Text = getCourseType(type);

// set the top end left position on the parent canvas for the course

this.SetValue(Canvas.LeftProperty, x);this.SetValue(Canvas.TopProperty, y);

}

string getCourseType(int type)

{

if(type.Equals(1)) //for when its a LEC

{

return("LEC");

}

else if (type.Equals(2)) //For when its a LAB

{

return ("LAB");

}

else

{

return ("NULL");

}

void Course_MouseMove(object sender, MouseEventArgs e)

{

// only execute this code when the user has started dragging

if (startDrag)

{

// position the center of the course to the cursor of the mouse

this.SetValue(Canvas.LeftProperty, e.GetPosition((Canvas)this.Parent).X - CourseRec.ActualWidth / 2);this.SetValue(Canvas.TopProperty, e.GetPosition((Canvas)this.Parent).Y - CourseRec.ActualHeight / 2);

}

void Course_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)

{

// stop forcing the capture of the moue to this element

CourseRec.ReleaseMouseCapture();

startDrag = false;

//TODO: use these property mutators to trigger a 'drop event' which will socket the course into place of the closest allowable position

this.SetValue(Canvas.LeftProperty, e.GetPosition((Canvas)this.Parent).X - CourseRec.ActualWidth / 2);this.SetValue(Canvas.TopProperty, e.GetPosition((Canvas)this.Parent).Y - CourseRec.ActualHeight / 2);

// double xPos = Convert.ToDouble(this.GetValue(Canvas.LeftProperty));

//double yPos = Convert.ToDouble(this.GetValue(Canvas.TopProperty));

Canvas main = this.Parent as Canvas;

CourseRec_Background.Opacity = 1;

}

void CourseRec_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

{

// force the capture of the mouse to this element

CourseRec.CaptureMouse();

startDrag = true;

CourseRec_Background.Opacity = 0.45;

}

void CourseRec_MouseLeave(object sender, MouseEventArgs e)

{

}

void CourseRec_MouseEnter(object sender, MouseEventArgs e)

{

}

<UserControl x:Class="SA11Demo2.Course"

xmlns="http://schemas.microsoft.com/client/2007"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

Width="171" Height="122" mc:Ignorable="d" x:Name="CourseControl">

<UserControl.Resources>

</DoubleAnimationUsingKeyFrames>

</Storyboard>

</UserControl.Resources>

<Rectangle.Fill>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

<TextBlock Height="20" HorizontalAlignment="Right" Margin="0,0,8,11" VerticalAlignment="Bottom" Text="<LEC?>" TextWrapping="Wrap" FontSize="22" Foreground="#FFFFFFFF" x:Name="type" FontFamily="Courier New" Width="79.497" d:LayoutOverrides="HorizontalAlignment, Width"/>

<TextBlock HorizontalAlignment="Center" Margin="0,0,0,0" VerticalAlignment="Top" FontSize="22" Text="<ccID*1234>" TextWrapping="Wrap" Foreground="#FFFFFFFF" x:Name="ccID" FontFamily="Courier New" Height="23.333"/>

<Rectangle.Fill>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Grid>

</UserControl>

BryX

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Joined on 04-21-2008
Posts 8