Specified element is already the logical child of another element. Disconnect it first.(DataGrid)

Specified element is already the logical child of another element. Disconnect it first.(DataGrid) by CSSForumEngineer

Closed

as External Help for as External

Type:	Bug
ID:	780079
Opened:	2/26/2013 9:39:39 PM
Access Restriction:	Public

Workaround(s)

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User(s) can reproduce this bug

OS info:

OS:64-bit Operating System
Processor:i7-2600
Edition: Windows 7 Enterprise SP1
VS info:

Visual Studio 2010 Premium/Ultimate
Version 10.0.40219.1 SP1Rel

I met a problem when I build one WPF Application.

1) Make sure the current windows theme is "Windows 7 Basic"

2) Create one WPF Application and pasted below code in the xaml window.

     <Window x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid>
            <DataGrid.Columns>
                <DataGridTextColumn >
                    <DataGridTextColumn.Header>
                        <Border HorizontalAlignment="Center" VerticalAlignment="Center" >
                            <TextBlock Text="aaa"/>
                        </Border>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Header="Test1"/>
                <DataGridTextColumn Header="Test1"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>
3) Build and run this application.

4) Switch the windows theme to "Windows Classic"

5) The WPF application crashed.

I got below error information,

System.InvalidOperationException
Specified element is already the logical child of another element. Disconnect it first.
at System.Windows.FrameworkElement.ChangeLogicalParent(DependencyObject newParent)
at System.Windows.FrameworkElement.AddLogicalChild(Object child)
at System.Windows.Controls.ContentControl.OnContentChanged(Object oldContent, Object newContent)
...

By the way, I tested in the other windows themes, the results as below

"Windows 7 Basic"-> "Windows Classic" --- Crashed
"Windows 7 Basic"->" High Contrast #1" --- Crashed
"Windows 7 Basic"-> "High Contrast Black"--- Crashed
"Windows Classic" -> "Windows 7 Basic"--- Crashed
"Windows Classic"-> "High Contrast Black"--- No Crash
"High Contrast Black"-> "Windows 7 Basic"--- Crashed
"High Contrast Black"-> "Windows Classic"--- No Crash
"High Contrast Black"-> "High Contrast #1"--- No Crash

Details (expand)

.NET Framework 4.0

OS:Windows 7 Enterprise SP1
VS:Visual Studio 2010 Premium/Ultimate

1) Make sure the current windows theme is "Windows 7 Basic"

2) Create one WPF Application and pasted below code in the xaml window.

     <Window x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid>
            <DataGrid.Columns>
                <DataGridTextColumn >
                    <DataGridTextColumn.Header>
                        <Border HorizontalAlignment="Center" VerticalAlignment="Center" >
                            <TextBlock Text="aaa"/>
                        </Border>
                    </DataGridTextColumn.Header>
                </DataGridTextColumn>
                <DataGridTextColumn Header="Test1"/>
                <DataGridTextColumn Header="Test1"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>
3) Build and run this application.

4) Switch the windows theme to "Windows Classic"

5) The WPF application crashed.

I got below error information,

System.InvalidOperationException
Specified element is already the logical child of another element. Disconnect it first.

English

Windows 7

English

Switch the windows theme "Windows 7 Basic" to "Windows Classic"
WPF crashed with the exception:Specified element is already the logical child of another element. Disconnect it first.

When Switch the windows theme, no error/exception.

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Thanks for your feedback . The product team itself no longer directly accepting feedback for Microsoft Visual Studio 2010 and earlier products. You can get support for issues with Visual Studio 2010 and earlier by visiting one of the resources in the link below:
<http://msdn.microsoft.com/en-us/vstudio/cc136615.aspx>