IT and business subjects
24-Apr-1111 Leave a comment
Use Object.Equals.
Then set the combobox selecteditem to a new instance of the object with the required ID or other.
Sample Equals
Public Overrides Function Equals(obj As Object) As Boolean
If obj Is Nothing Then
Return False
End If
Return CType(obj, Customer).ID = Me.ID
End Function
24-Apr-1111 Leave a comment
Error message
Deleted row information cannot be accessed through the row.
This may occur when using Lambda functions and in other scenarios as well.
Problem
Dim dtTotal = dsBusiness1.InvoiceDetail.Where(Function(r1) r1.InvoiceNo = cInvoice.InvoiceNo AndAlso r1.RowState <> DataRowState.Deleted)
Solution 1
Dim dtTotal = dsBusiness1.InvoiceDetail.Where(Function(r1) r1.RowState <> DataRowState.Deleted AndAlso r1.InvoiceNo = cInvoice.InvoiceNo)
Solution 2
Use AcceptChanges on datatable to force deletions to clear
Try
Me.MyBindingSource.RemoveCurrent()
Me.MyBindingSource.EndEdit()
Me.ds1.MyTable.AcceptChanges()
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
24-Apr-1111 Leave a comment
See http://support.microsoft.com/kb/932491
I got this when i was repeatedly updating totals in databound text boxes from Detail rows into the Header table on every move or listchanged. Then bindingsource.addnew, then fill in data, then try and save giving error:- Datatable internal index is corrupted ‘5’
If e.ListChangedType <> System.ComponentModel.ListChangedType.Reset Then
GetSumFromDetail()
End If
23-Apr-1111 Leave a comment
Window form and control properties may be bound to Application Settings, by expanding the Application Settings at the top of the control properties.
This works fine, for say BackColor. However be warned, there is then a marker by the related bound property. If you then set this manually, this is actually bi-directional and you will change it in the Settings file at the same time, and hence all accross your application, which is probably not your intended action.
See Microsoft Book 70-505 Windows Forms p 587
23-Apr-1111 Leave a comment
Place in header part of file. My initial mistake was
xmlns:local="clr-namespace:MyConverters
Should have been
xmlns:local="clr-namespace:OneWay.WPF.MyConvertersNeed to include the assembly, even if it is the same project.
In this code local gives the namespace a short name.
Next using the namespace in XAML
<Style.Resources>
<local:ButtonCenterConverter x:Key=”DivideByTwo”></local:ButtonCenterConverter>
</Style.Resources>
22-Apr-1111 Leave a comment
<ResourceDictionary xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”>
<Style TargetType=”Button”>
<Style.Triggers>
<EventTrigger RoutedEvent=”Button.MouseEnter”>
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty=”(RenderTransform).ScaleTransform.ScaleX)” To=”1.1″ Duration=”0:0:0.15″ />
<!–AutoReverse=”True” RepeatBehavior=”2x”–>
</Storyboard>
</BeginStoryboard>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty=”(RenderTransform).(ScaleTransform.ScaleY)” To=”1.1″ Duration=”0:0:0.15″ />
<!–<DoubleAnimation
Storyboard.TargetName=”GrowingButton”
Storyboard.TargetProperty=”Button.Height” To=”80″ Duration=”0:0:0.2″ />–>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent=”Button.MouseLeave”>
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty=”(RenderTransform).(ScaleTransform.ScaleX)” To=”1.0″Duration=”0:0:0.15″ />
<!–AutoReverse=”True” RepeatBehavior=”2x”–></Storyboard></BeginStoryboard>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty=”(RenderTransform).(ScaleTransform.ScaleY)” To=”1.0″ Duration=”0:0:0.15″ />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
<Setter Property=”RenderTransform”>
<Setter.Value>
<ScaleTransform
ScaleX=”1″ ScaleY=”1″
CenterX=”50″CenterY=”10″
/>
<!–CenterX=”{Binding Path=ActualWidth, ElementName=Button,Converter=}”–>
</Setter.Value>
</Setter>
</Style>
Use Style=”{x:Null}”
See Wrox VB2010 p214
<Button Content=”Load” HorizontalAlignment=”Left” Name=”LoadButton” VerticalAlignment=”Top” Width=”75″ >
<Button.Triggers>
<EventTrigger RoutedEvent=”Button.MouseEnter”>
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName=”LoadButton”
Storyboard.TargetProperty=”Opacity” From=”1.0″ To=”0.0″ Duration=”0:0:1″ AutoReverse=”True” RepeatBehavior=”Forever” />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Button.Triggers>
</Button>
<Button Content=”Growing” HorizontalAlignment=”Left” Margin=”479,4,0,0″ Name=”GrowingButton” VerticalAlignment=”Top” Width=”75″ >
<Button.Triggers>
<EventTrigger RoutedEvent=”Button.MouseEnter”>
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName=”GrowingButton”
Storyboard.TargetProperty=”Width” To=”80″ Duration=”0:0:0.5″ AutoReverse=”True” RepeatBehavior=”2x” />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Button.Triggers>
</Button>>
22-Apr-1111 Leave a comment
The help page in MSDN is at:
http://msdn.microsoft.com/en-us/library/ms746624.aspx?lc=1033
I originally got this wrong, by trying to create a new Resource dictionary and placing the XAML <Application.Resources> into this new file.
When you create a new WPF application, an Application.xaml file is created automatically. This already contains an <Application.Resources> section, so just add in your new resources direct into here.
Create Resource Dictionary, possibly putting it in a different folder, perhaps named Assets.
Then in Application.xaml
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source=”Assets\Dictionary1.xaml” />
<ResourceDictionary Source=”Assets\Dictionary2.xaml” />
</ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
</Application.Resources>
<–Seem to be only able use Resoure Dictionary or Application.Resources not a mix of both
So Following line is invalid, because of following ResourceDictionaries
May be possible if a Key is used somewhere>–>
<!–<Brush x:Key=”myColorYellow”>Yellow</Brush>–>
If on a window or page and “The designer does not support loading dictionaries that mix “ResourceDictionary” items without a key and other items in the same collection”
Put the other resources inside the ResourceDictionary even if they are designed there.
With thanks to http://stackoverflow.com/questions/3818000/how-to-define-resources-and-a-mergedictionary-with-a-key-in-a-sl4-page
In the following example of use. RDL01 is an external assembly. The word “component” is there as seen here.
<StackPanel>
<StackPanel.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source=”/RDL01;component/Dictionary1.xaml”></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</StackPanel.Resources>
<Button Content=”Hello” Width=”100″ Height=”50″></Button>
</StackPanel>
Use extract value to resource
04-Apr-1111 Leave a comment
If get error:
“Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding”
Setting the connection string timeout does not work.
Following links led me to my own visual basic translation. I found i had to add the check for the commandCollection Is Nothing
http://www.velocityreviews.com/forums/t123478-how-to-set-commandtimeout-for-getdata-method-of-tableadapter-asp-net-2-0-a.html
http://www.pcreview.co.uk/forums/tableadapter-and-commandtimeout-t2354775.html
Because the DatasetName.Designer.vb is a partial class, it is possible to create a second partial class which will not be overwritten on changes to the dataset. Remember to use
Namespace xxxTableAdapters
Partial Public Class xxxTableAdapter
Public WriteOnly Property SetSelectCommandTimeout() As Integer
Set(ByVal value As Integer)
If Me._commandCollection Is Nothing Then
Me.InitCommandCollection()
End If
Me.CommandCollection(0).CommandTimeout = value
‘For Each cmd In Me._commandCollection ‘To do all
‘ cmd.CommandTimeout = value
‘Next
End Set
End Property
End Class
End Namespace
Stephen Shakespeare 