Data Binding Demo

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.NET Development
.NET Framework 3.5
Samples (.NET Framework Technologies)
Windows Presentation Foundation Samples
Application Samples (WPF)

Data Binding Demo
This page is specific to:.NET Framework Version:3.03.54.0

Windows Presentation Foundation Samples

Data Binding Demo

This sample creates a product listing application that allows users to enter items for sale. This sample demonstrates the following data binding concepts:

The binding object
Data context
Data templates
Property change notifications
Validation
Conversion
Data triggers
Multibinding
Binding to sub-properties
Master-Detail paradigm
Collection view source
Grouping
Sorting
Filtering

This sample demonstrates a specific feature of the Windows Presentation Foundation (WPF) and, consequently, does not follow application development best practices. For comprehensive coverage of Windows Presentation Foundation (WPF) and Microsoft .NET Framework application development best practices, refer to the following as appropriate:

Accessibility - Accessibility Best Practices

Security - Windows Presentation Foundation Security

Localization - WPF Globalization and Localization Overview

Download sample

Building the Sample

Install the Windows Software Development Kit (SDK) and open its build environment command window. On the Start menu, point to All Programs, Microsoft Windows SDK, and then click CMD Shell.
Download the sample, usually from the software development kit (SDK) documentation, to your hard disk drive.
To build the sample from the build environment command window, go to the source directory of the sample. At the command prompt, type MSBUILD.
To build the sample in Microsoft Visual Studio, load the sample solution or project file and then press CTRL+SHIFT+B.

Running the Sample

To run the compiled sample from the build environment command window, execute the .exe file in the Bin\Debug or Bin\Release folder contained under the sample source code folder.
To run the compiled sample with debugging in Visual Studio, press F5.

Community Content

Sample doesn't build in VS2008.

Added by:durgesh dwivedi

Error 1 Specified cast is not valid. C:\Users\Me\Desktop\DataBindingLab\csharp\AddProductWindow.xaml 108 25 databindinglab

The sample raises a error into the designer. Using VS 2008

Added by:Thomas Lee

The HOL exercise 1 works fine, but into the designers this code raise "Specified cast is not valid":

<ComboBox.IsEnabled>
<MultiBindingConverter="{StaticResource specialFeaturesConverter}">
<Binding Path="CurrentUser.Rating"
Source="{x:Static Application.Current}"/>
<Binding Path="CurrentUser.MemberSince" Source="{x:Static Application.Current}"/>
</MultiBinding>
</ComboBox.IsEnabled>

This is at the 4th point of exercise 1.

indyfromoz

Added by:Thomas Lee

In SpecialFeaturesConverter.cs, update the following two lines of code -

Line 13 - int rating = values[0] is int? (int)values[0] : 0;
Line 14 - DateTime date = values[1] is DateTime ? (DateTime)values[1] : new DateTime(1900, 1, 1);

dmcgloin: You will no longer see the error

Cheers,
indyfromoz

Snippets in a more communicative style

Added by:Thomas Lee

int rating; //declare rating Dim rating

if(values[0] is int)
{
rating = values[0];// no need to do cast because check passes
}
else
{
rating = 0;
}

DateTime date; //Dim DateTime

if(values[1] is DateTime)
{
date = values[1];no need to do cast because check passes
}
else
{
date = new DateTime(1900,1,1);
}

This should be fairly straightforward to convert to VB.NET. Hope that helps.

Invalid Cast exception when Add Product is clicked - VS2008

Added by:MikeT-UK

Class SpecialFeaturesConverter
...
If

values(0) = System.Windows.DependencyProperty.UnsetValue Then
...

Detail message: Operator '=' is not defined for type 'Integer' and type 'NamedObject'

RE: NE1?

Added by:Daniel in CO

Visual basic 2008 adds support for ternary operations via the If() statement. Here is the code for this project:

Dim rating AsInteger = If(TypeOf (values(0)) IsInteger, CType(values(0), Integer), 0)

Dim theDate As DateTime = If(TypeOf (values(1)) Is DateTime, CType(values(1), DateTime), New DateTime(1900, 1, 1))

Lines 8-13 also need to be changed to use the .Equals syntax instead of "="

If values(0).Equals(System.Windows.DependencyProperty.UnsetValue) Then

ReturnFalse

EndIf

If values(1).Equals(System.Windows.DependencyProperty.UnsetValue) Then

ReturnFalse

EndIf