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. Grid size, i.e. number of rows and columns, is calculated as view size divided by cell size. As number of rows and columns are integers, real size of cells on the view could not equal to values https://traderoom.info/displaying-data-in-tables-with-wpf-s-datagrid/ of cell width and height. This mechanism is used to add, remove and update the dynamic columns when the role table is modified. This article shows an implementation of dynamic column handling for WPF DataGrid controls. It is a straight forward MVVM implementation where the dynamic column handling is done in the view-model layer.

Grid with dynamic number of rows and columns, part 1

After new cells set is created, collection of cell view models should be updated. In the previous post, this collection was recreated each time and it leads to application hangs. This issue is solved by asynchronous method of updating current collection.

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Add C1FlexChart and C1FlexGrid to the view, bound their ItemsSources and respective properties. Now, create a ViewModel named DataViewModel, which will connect to the View. We can create some properties and methods in ViewModel which can be bound to the view.

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Instead of binding to the check box control, a value converter is instantiated and bound to the DataGridCell that will contain the CheckBox control. The Binding definition in the AddRoleColumn method shown above contains an assignment to the value converter. The relative source of the bound control is set to the DataGridCell, found as an ancestor of the CheckBox control (the binding is defined on the CheckBox level). The DataGridCheckBoxColumn binds the check box control to a boolean property of the data in the row that it is displaying.

Next, a header row is created and added to the table, and the cells in the header row are created and populated with content. Next, a title row is created and added to the table withsome formatting applied. The title row happens to contain a single cellthat spans all six columns in the table.

Adding a Table to a WPF Document

The Datagrid column definition in WPF and its corresponding row definition are represented by two parameters – GridWidth and GridHeight. Dynamic grid is implemented as user control that contains DataGrid control bound to observable collection of collections of cell view models. The data is kept in three tables in the UserRoleDataSet (Role, User and UserRole).

The value converter’s Convert method is called, every time the DataGrid cell is initially modified or lost its focus. In both cases, the user and the role roles are retrieved and the conversion result is returned. The user row is fetched from the DataGridCell’s DataContext, which contains the DataRowView instance that has the user row in its Row property. The DataGridCheckBoxColumn binds the check box control to a (nullable) boolean property of the data in the row that it is displaying. In this case, it would be a boolean property in the user data row, which represents the user to role assignment. Since there is no such property in the UserTable definition, another solution has to be implemented.

In Windows Presentation Foundation , the datagrid is a highly-adaptable control for displaying information in tables in your Windows desktop applications. While naturally suited for tabular data, it is flexible enough to present many different kinds of dynamic content. Using it from desktop applications is very similar to how it can be used on the web with Silverlight, or in Windows Phone applications.

The value converter’s Convert method is called, every time the DataGrid cell is initially modified or lost its focus. In both cases, the user and the role roles are retrieved and the conversion result (if the user has the role assigned or not) is returned. The user row is fetched from the DataGridCell’s DataContext, which contains the DataRowView instance that has the user row in its Row property.

Object tagging is the functionality that allows objects to be tagged to a control. This can be used in situations where the control is available, but an object cannot be accessed using standard application logic. In the case of this sample, the available control is the CheckBox in the DataGridCell and the required object is the role that corresponds to the column. The relative source of the bound control is set to the DataGridCell, found as an ancestor of the CheckBox control . There is an issue with binding to view size – as bindings are executed in single thread, new values of view width and height come in different moments.

It is a good in-memory database with referential integrity, and it contains built-in notification delegates that publish the insertion, removal and modification of data rows. After setting , the final source code of the MainWindow.XAML is given below. Similarly set the content of the buttons as insert, delete and reset text box. Connect and share knowledge within a single location that is structured and easy to search.

All used IP-addresses, names of servers, workstations, domains, are fictional and are used exclusively as a demonstration only.2. I wanted to bind ProductName from RestaurantProduct through records and bind and then show like buttons.how can i bind that to uniform panel? I wanted to bind ProductName from RestaurantProduct through records and bind and then show like buttons. The two helper methods AddColumn and AddRow used in the example are candidates to be implemented as extension methods for the DataTable. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. Find centralized, trusted content and collaborate around the technologies you use most.

The CheckedBoxOnChecked method is called whenever the check box state is modified. The logic searches for the CheckBox’s DataGridCell and gets the user and role https://traderoom.info/ instances that belong to it. It will add or delete the user-role entry depending on the CheckBox.IsChecked state and whether a UserRoleRow is already present.

1. The user row is fetched from the DataGridCell’s DataContext, which contains the DataRowView instance that has the user row in its Row property.
2. The DataView allows the modification, insertion and removal of rows and the prevention of these actions.
3. This is the key step so that when data changes by FlexGrid, the View (which also contains FlexChart) will be notified.
4. This way you can avoid to build the DataGrid explicitly in C#/code-behind and instead use the auto-generation feature.
5. Asynchronous method allows to keep application responsible, and using cancellation token allows to cancel updating if control size is changed again.

The drawback of this solution is that GUI components spilled over into the ViewModel layer. Dynamic grid is implemented as user control that contains DataGrid control bound to observable collection of collections of cell view models. In this implementation collection of cells is recreated each time if grid width or grid height is changed, and it leads to some application pauses. In the following post this issue is solved with asynchronous method that updates cell array. Also, other implementation for cells could be used; for example, 2-dimensional array of cells ICellViewModels[][] works well. Also, other implementation for cells could be used, for example, 2-dimensional array of cells ICellViewModels[][] works well.