Dynamic tables depends on item typeWPF in Reporting

The post is devoted to the WPF gridview with a dynamically-defined number of rows and columns but all cells have the same width and height. For example, such a grid could be used in chess or checkers games for 8×8 field. https://traderoom.info/displaying-data-in-tables-with-wpf-s-datagrid/ As an added bonus I added the functionality that the CheckBox control is not shown in the user data grid new item row. This mechanism is used to add, remove and update the dynamic columns when the role table is modified.

The Data Model

Now you can edit, add or remove data from Flexgrid, which will dynamically update to the FlexChart. 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.

Common interface controls

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. The drawback of this solution is that GUI components spilled over into the ViewModel layer. 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.

1. DataGrid is a data shaping component that allows the end user to manage the data and also display the data on the screen.
2. The following code snippet demonstrates how to create a bar chart from the data table.
3. And the green area has a fixed size with 3 columns, but new columns can be added.
4. The data grid control’s column property is declared as read-only, so it cannot be bound to a view model property.
5. In both cases, the user and the role roles are retrieved and the conversion result is returned.

Grid with dynamic number of rows and columns, part 1

Due to Wpf architecture and as dynamic grid user control item source is bound to Cells collection, all changes of this collection is done via Dispatcher. In the application priority DispatcherPriority.ApplicationIdle is https://traderoom.info/ used as it is executed after all data bindings, but other value could be used. The rows and columns can be added, removed and modified by editing the rows of the A and/or the B table.

To find detailed explanations of each feature in the Charts control with code examples, refer to this documentation. 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.

Wpf application

For example, such grid could be used in games at infinite 2D field or implementation of cellular automaton. A converter is used to get this information and it is mapped to the CheckBox’s Visibility flag. The Role and User tables are bound to the data grid controls via a DataView. The data is kept in three tables in the UserRoleDataSet (Role, User and UserRole). The data grid control’s column property is declared as read-only, so it cannot be bound to a view model property.

It provides a feature called AutoGenerateColumns that automatically generates columns. This article shows you can create or retrieve tables in the code behind. The Datagrid column definition in WPF and its corresponding row definition are represented by two parameters – GridWidth and GridHeight. As an added bonus (and to prevent extra state logic) I added the functionality that the CheckBox control is not shown in the user data grid new item row. The DataGridCheckBoxColumn style has to be modified, and the Visibility flag of the CheckBox has to be set, depending on the contents of the DataGridCell. A converter is used to get this information and it is mapped to the CheckBox’s Visibility flag.

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 DataView allows the modification, insertion and removal of rows and the prevention of these actions. The data grid control can handle the data manipulation using the DataView. Rows can be inserted, modified and removed in the data grid control and the data tables are directly updated through the DataView.

The logic searches for the CheckBox’s DataGridCell and gets the user and role 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. Every DataSet table has a set of events that can be used to get notified on data modifications..

We can create some properties and methods in ViewModel which can be bound to the view. The Datagrid column definition in WPF and its corresponding row definition are represented by two parameters – GridWidth and GridHeight. 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. Create a model class according to the data and implement the INotifyPropertyChanged interface to notify when a property value changes. This is the key step so that when data changes by FlexGrid, the View (which also contains FlexChart) will be notified.

Asynchronous method allows to keep application responsible, and using cancellation token allows to cancel updating if control size is changed again. 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. 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.

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. Two DataGridTextColumns are instantiated for the first and the last name, and the cell content are bound to the data row through the binding to the row’s respective fields.

I am trying to find a way to create the datagrid dynamically (in-code) so that I can create multiple copies of it and bind it to different datasources at run-time. The logic searches for the CheckBox’s DataGridCell and gets the user and role instances that belong to it. 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.

You can now easily plot the values of the data table on different types of charts. And the green area has a fixed size with 3 columns, but new columns can be added. You can check more than 4 column table cells by scrolling the green area to the left or right. Data can be visualized in different forms, like in a table/grid form or a graphical representation, for example. ComponentOne FlexGrid is used to visualize data in table/grid form, and FlexChart is a graphical representation of data. FlexGrid and FlexChart can be synchronously connected to the data to see dynamic updates on any change in data.