- Declaring a DataGrid in XAML
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- Convert a dynamic object to a data table
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If there is no entry for a certain user-role combination, then that means that the user in question does not have the corresponding role assigned. And the green area has a fixed size with 3 columns, but new columns can be added. Soon, the green area should be able to scroll left and right. You can check more than 4 column table cells by scrolling the green area to the left or right. If you would prefer to do more of the work from the code-behind script, you can create the CollectionViewSource in C# code, and only declare the datagrid itself in XAML. To create the necessary CollectionViewSource and PropertyGroupDescription objects, using directives must be added for System.ComponentModel and System.Windows.Data.
Changing the SelectionUnit to CellOrRowHeader allows individual cells to be selected by clicking them, and entire rows to be selected by clicking the row headers. IsReadOnly – when true, prevents the user from double-clicking a cell to edit its contents. CanUserSortColumns – allows the user to sort the data in the table by clicking on column names. CanUserResizeColumns – allows the user to change the width of columns in the table. To find detailed explanations of each feature in the Charts control with code examples, refer to this documentation.
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Its contents can be stored to an XML file, which is used as a persistence mechanism in this example. In this first part, I focus on the solution of handling dynamic columns. In order to simplify the solution, I broke an architectural constraint, which is that objects of a top layer should not be used in lower layers . In general, the visual appearance of a datagrid should be controlled by application-wide themes, styles, and templates, rather than setting the properties for a single grid. For more information about styling in WPF, you can refer to Learn C# 2010 Part III, which is part of a very thorough course explaining the essentials of C# and WPF.
Declaring a DataGrid in XAML
The default settings of a datagrid allows the user to select entire rows by clicking the left mouse button. With this, the SelectionMode property is Extended, and the SelectionUnit is FullRow. The property Header sets the text that is displayed at the top of the column. Data binding is a fairly extensive topic, and cannot be covered in depth here. In the examples that follow, a data source is created using an ObservableCollection of a custom class in the window’s code-behind script. In this short guide, you will see how to add a datagrid to a WPF project using extensible application markup language and C#.
- This article shows an implementation of dynamic column handling for WPF DataGrid controls.
- If you are using .Net 4.0, you can use the build in DataGrid control which you can select from the toolbox.
- The data model of this sample consists of a User and a Role table, and a UserRole table that is the correlation table between the other two tables.
Finally, for the group headers to actually appear when the program is run, you must define their visual appearance in the datagrid’s GroupStyle property. You can use the EnumerateChildrenOfType method to get all tables in the document. If you need WPF to populate datagrid, please refer to the following discussion on Microsoft’s Q&A blog.
In the other hand, Table object has more capabilities over the grid element. Within a Table object, Rows must be contained in a TableRowGroup element. Each row in the table contains one or more Table cells objects represented by TableCell elements, the number of the Table cells must be equal to the defined columns number. The columns are defined first, then come the rows groups those host table rows elements witches host the Tab cells witches host the blocs such as Paragraph elements. I guess it isn’t very clear until now; therefore, I invite you to parse the following representation. Every DataSet table has a set of events that can be used to get notified on data modifications..
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 . This article describes a method many-to-many relations can be displayed and modified in a WPF datagrid control.
The logic searches for the https://traderoom.info/‘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. 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.
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. If you are using .Net 4.0, you can use the build in DataGrid control which you can select from the toolbox.
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The role is retrieved from the ColumnTag that is assigned to the column when it was added. You can look at the WPF grid example in the image below, which shows a 10×5 grid table. The values for the number of rows and columns may change dynamically. In this blog, we have seen how to use the Syncfusion Charts control to visualize JSON data in a WPF application. Try out the steps provided in this blog post and create beautiful charts. The CheckedBoxOnChecked method is called whenever the check box state is modified.
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.
The wpf dynamic tableGridCheckBoxColumn binds the check box control to a 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.
Convert a dynamic object to a data table
You can also export charts to popular image formats like PNG and JPEG. JSON is one of the most widely used data formats, but working with it can be challenging. In this section, we are going to see two ways data can be retrieved from a JSON string. Changing the SelectionMode to Single only allows the user to select a single item.
The role is tagged to the column and can be retrieved at a later time. The ObjectTag itself is a DependencyProperty that can be attached to any type of control that is derived from DependencyObject. The data model of this sample consists of a User and a Role table, and a UserRole table that is the correlation table between the other two tables. An entry in the UserRole table means that the user has a role assigned (referenced by the role’s id).
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.
This mechanism is used to add, remove and update the dynamic columns when the role table is modified. The WPF datagrid control supports grouping rows by their column values – making complicated tables easier to read – and this can be extended with expand and collapse functionality. 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.
In the next article, I will show a solution that implements the same application, but with a more strict separation of business logic and GUI controls into their respective layers. Create the binding by setting the grid’s ItemSource property to inherit from the data context. 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.
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. The post showcases a WPF datagrid with dynamic columns where the number of rows and columns is defined but all cells have the same size. The user data grid column definition is stored in the UserRolesColumns collection. This means that the default columns, the user’s first and last name, have to be in this collection too.
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Learn C# Part III covers WPF controls and key concepts such a data binding. This article describes the dynamic insertion and removal of columns in a WPF datagrid. To show information, you must bind the datagrid to a suitable data source. In order to merge cells in the table you can use the RowSpan and ColumnSpan properties of the TableCell.
At the contrast of the Grid object witch is defined in the System.Windows.Controls, the table object is defined in the System.Windows.Documents namespace. Moreover, and at the contrast of the grid element, the Table element must be contained in one of those containers. Wpf application is done in MVVM pattern with one main window. Dynamic grid is implemented as user control that contains DataGrid control bound to observable collection of collections of cell view models.
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. If the data row is the new item row, then it has a NewItemPlaceHolder. 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.