Dynamic Binding to Data Table in UI for WPF

The internal view uses LINQ expression syntax to generate operations, this works well for including custom LINQ expressions inside operations such as sorting, filtering, grouping, etc. All the default Summary Aggregates now implement ISummaryExpressionAggregate interface. This typically informs the ICollectionViewAdv to expect an Expression to evaluate at run time.

Comments on “Displaying and editing many-to-many relational data in a WPF DataGrid”

You can now build and run the application to see the datagrid in action. To see how these features compare to the Windows Forms DataGridView, check out our previous blog, The Definitive Guide to .NET C# Datagrids. In this application I use it as a memory database that can store its data to an XML file. I like it for the samples, because it allows me to use database like functionality without the need of SQL servers. The DataSet can be used together with database connections to store and retrieve data from SQL servers, etcetera. In this application, I use the persistence mechanism to store to and retrieve data from an XML file.

Displaying Data In Tables With Wpf’s Datagrid Control

1. It provides a feature called AutoGenerateColumns that automatically generates columns.
2. It added grouping and row details, providing a cleaner way to organize data.
3. Let’s replace the DataGrid control with FlexGrid, and then we’ll continue to customize it with advanced grouping and filtering.
4. The behavior checks the row’s state when the user clicked the check box.
5. This is a basic example of a way to allow merging/splitting of grid cells in a WPF application.

The next three columns are DataGridTextColumns and the last column is a DataGridCheckBoxColumn. To create manual columns, the AutoGenerateColumns property must be set to false. The Grid Table exposes an API named GetUnboundValue that can be used to retrieve the unbound value of a specific unbound cell. Given the record index and the respective Unbound Column object, it returns the unbound field value for the specified record. It is overloaded to accept row and column indices as parameters using which it fetches the corresponding unbound visible column and yields its value as output. Essential Grid now provides support to validate the grid data and display error information.

This is the key step so that when data changes by FlexGrid, the View (which also contains FlexChart) will be notified. Following is the code example that iterates through the SelectedItems collections and prints the values of those records that are in selection. The default summaries work much the same way as summaries with bound columns.

Allow users to save their views for quick analysis on future runs of the application. Analyze and handle up to hundreds of millions of records in a fraction of a second. ComponentOne FlexPivot can handle very large data sets thanks to its powerful data engine that stores data in memory-mapped files using column-oriented technology. Just connect the all-in-one FlexPivotPage component to a data source and you have a complete analytical tool including the pivot panel, grid, chart and a toolbar. The SelectionMode can be set to Single or Extended to define if one or multiple units can be selected simultaneously. The latest values of each are combined into a new PageRequest and the page controller is updated to this value.

This generates a simple list of objects and assigns it to the datagrid’s ItemsSource property. In this article, we discuss the evolution of the .NET datagrid, the top features of a WPF datagrid, and how to use a datagrid in your WPF application code. DataGrid is a data shaping component that allows the end user to manage the data and also display the data on the screen. It provides a feature called AutoGenerateColumns that automatically generates columns. IsReadOnly – when true, prevents the user from double-clicking a cell to edit its contents. You can set AutoGenerateColumns property in DataGrid both in XAML and code-behind class.

Highlight high and low values by coloring the text color, cell color or text weight. For example, highlight values below zero, or highlight the top 10% of values. Notice that the BoolToImageConverter class is identified and the Key value set to CovertBoolToImage. Within the DataTemplate element the Key is set to StatusImage and the source binds to Convertor which links to the BoolToImageConverter class via its Key value. This blog will show how to connect a FlexChart to a FlexGrid to create a bound MVVM (Model-View-ViewModel) scenario similar to Microsoft Excel. Users can add, delete and modify items in FlexGrid, which will reflect in FlexChart.

1. Main windowWpf application is done in MVVM pattern with one main window.
2. Now, you’ll observe that when you type in the TextBox, the FlexGrid automatically filters.
3. These interfaces set up a two-way communication between the bound grid and the objects collection used by the same grid.
4. If you need WPF to populate datagrid, please refer to the following discussion on Microsoft’s Q&A blog.
5. In order to invoke an unbound column through the lambda delegate, you have an internal wrapper lambda that is generic.
6. I have problem like data  comes from db in viewmodel and load in tabel.

Since the collections are dynamic, we need to specify the proper type for the column to work properly in all scenarios. GridDataVisibleColumn provides a DataType property to specify the type for the column. A return value is required for any LINQ Aggregate method to be implemented. In order to invoke an unbound column through the lambda delegate, you have an internal wrapper lambda that is generic. A many-to-many relationship is one where two data tables or entities have multiple rows that are connected to one or more rows in the other table. You can customize the FlexPivotPage control, or use the separate grid, panel and chart components to build a completely custom pivot UI.

View model of dynamic data grid contains cell, view and grid sizes, data model for cell set, and collection of collections of cell view models. Actually, it is not a clear approach from the point of MVVM pattern, as view model should know nothing about view, but it is realized in accurate way via binding and attached properties. Grid size, i.e. number of rows and columns, is calculated as view size divided by cell size.

Since I am not quite certain about the result you wish to achieve, I will provide several Knowledge Base articles that describe how to create different kinds of dynamic Tables.

Rendering basic columns in a DataGrid

Dynamic grid is implemented as user control that contains DataGrid control bound to observable collection of collections of cell view models. Note that the XAML markup for the view contains only an empty DataGrid and the columns and bindings are defined in code. This is perfectly acceptable and does not break the MVVM pattern since all code is view related. The MVVM design https://traderoom.info/displaying-data-in-tables-with-wpf-s-datagrid/ pattern is about separating application logic from your view logic and not necessarily about eliminating code out of the views. The reason why this is done in C# code instead of static XAML markup is of course that the number of groups (columns) is dynamic and may vary over time.

These DataSet objects can operate independent of the .NET data providers. I looking for it in google and I am only finding info about how to bind values through data templates. The WPF DataGrid offers the possibility to add rows directly in the data grid. This can be disabled by setting the data grid’s flag ‘CanUserAddRows’ to false. The grid can do this because the data source is a DataView, and the view contains the functionality to manipulate the data table contents.

As you can see, I dynamically create a Binding, and use the index of the column in my model as the binding path. This method is responsible for creating the actual CheckBox control that is bound to the column’s Binding property. Create dynamic pivot tables like Microsoft Excel and aggregate millions of rows of data in milliseconds with ComponentOne FlexPivot. A cell can contain multiple controls, they can span over multiple cells and even overlap themselves. This section provides a tutorial on using the third-party FlexGrid control from MESCIUS for comparison. It requires that you first complete the tutorial above to set up the application and data source.