Dynamic Columns in a WPF DataGrid Control Part 1- CodeProject
Also, I don’t really need to use specifically the DataGrid, as this will be simple table of strings for preview only – it may be as well displayed, say, inside Grid with ItemsControl – I just need to provide a view with columns and rows. Learn how to resolve IBM iSeries database update issues and iDB2Exception errors without altering the connection string’s library list. Explore DB2 Row Level Security and how access controls propagate across foreign key relationships in relational databases. Learn how to perform efficient set membership checks using SQL CASE WHEN IN statements. This example demonstrates the use of stored procedures for encapsulating data manipulation logic.
Instead of individual updates for each table, we can use a single, unified approach. This involves creating a view or stored procedure that combines data from relevant tables, simplifying data access and manipulation. The WPF application then interacts with this consolidated data source. This streamlined approach minimizes the number of database interactions, leading to improved performance, especially when dealing with large datasets. The use of parameterized queries further enhances security by preventing SQL injection vulnerabilities. By centralizing data access through a well-defined interface, the application’s maintainability is greatly improved.
- This two-pronged approach prevents invalid data from entering the system, maintaining data integrity and enhancing the overall reliability of the application.
- Note that the XAML markup for the view contains only an empty DataGrid and the columns and bindings are defined in code.
- For the command of the view model to know what to do when it gets executed, you have to pass it some parameters.
- This example showcases how to retrieve data from multiple tables using a JOIN operation.
- This example shows how to add a database constraint to ensure data integrity.
- Therefore this grid has the dynamic contents, displaying each role as a separate check box column.
Displaying data
This involves defining constraints on database columns, such as data types, lengths, and nullability, and implementing validation logic in the WPF application before submitting data to the database. This two-pronged approach prevents invalid data from entering the system, maintaining data integrity and enhancing the overall reliability of the application. The combination of database constraints and application-level validation provides a robust defense against invalid data, minimizing errors and ensuring data accuracy. Regular testing and validation procedures further solidify data integrity and contribute to a more stable and reliable application.
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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. 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. 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.
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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 https://traderoom.info/displaying-data-in-tables-with-wpf-s-datagrid/ 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).
Grid with dynamic number of rows and columns
This example shows how to update the price of a specific product in the Products table. It’s crucial to include a WHERE clause to specify which record to update, preventing accidental modifications.
As you can see, I dynamically create a Binding, and use the index of the column in my model as the binding path. When building an application, I might not have the luxury of creating model classes to represent the objects I’ll be rendering on screen, because they are dynamic. If I don’t know the shape of my data, I can use a meta model (a model of the final model) to represent it.
Also, other implementation for cells could be used; for example, 2-dimensional array of cells ICellViewModels works well. 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 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. For example, if you add another row to the Group database table, you want another column representing this new group to show up in the DataGrid without any changes to the code.