Скачать или смотреть How to Format DataGrid Columns in WPF C# .NET 4.7.2

Learn how to index and change the format of DataGrid columns in WPF C# .NET 4.7.2. Discover a simple method to round decimal values using data binding and auto-generating columns.
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This video is based on the question https://stackoverflow.com/q/66221708/ asked by the user 'Pierre_CM' ( https://stackoverflow.com/u/13733229/ ) and on the answer https://stackoverflow.com/a/66221966/ provided by the user 'user2250152' ( https://stackoverflow.com/u/2250152/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction: The Challenge of Formatting DataGrid Columns

Working with WPF applications can become tricky, especially when dealing with data representations in controls like DataGrid. If you've ever pulled data from an SQL database into a DataGrid and found that you can't format columns directly in XAML, you're not alone! In this guide, we will explore how to index DataGrid columns and change their formats programmatically, specifically how to round numbers to two decimal places.

The question arises: How can we achieve the same formatting flexibility in WPF that is available in other frameworks like WinForms? Let’s dive in and find out how to solve this problem!

The Initial Code Setup

Before we tackle the formatting, let's briefly review the code necessary to populate a WPF DataGrid with data from SQL Server. Below is a simple example of how to fill the DataGrid:

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In this code:

We define the SQL query to select data.

Establish a connection to the database.

Use a SqlDataAdapter to fill a DataTable and set it as the DataGrid's ItemsSource.

However, directly formatting columns in XAML isn’t straightforward. Let’s explore the solution.

Solution: AutoGeneratingColumn Event

In WPF, if your DataGrid’s columns are auto-generated (which is often the case), you can handle the AutoGeneratingColumn event. This allows you to apply formatting directly inside the event handler based on column properties.

Step-by-Step Instructions

Attach the Event Handler: First, connect the AutoGeneratingColumn event to your DataGrid.

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Create the Event Handler: Next, define the event handler. This is where the magic happens. Inside the handler, you can check the property names of the columns being generated.

[[See Video to Reveal this Text or Code Snippet]]

In the example above:

We check if the property name corresponds to the column we want to format (in this case, "MyColumn").

If it matches, we cast the column to DataGridTextColumn and set the Binding with a StringFormat to round the value to two decimal places.

Additional Formatting Options

If you want to apply different formatting to various columns, simply repeat the check within your event handler for each relevant property name. You can customize the string format based on your specific needs.

Benefits of This Approach

Flexibility: You can format multiple columns dynamically based on their properties.

Maintainability: By handling formatting in the code-behind, you maintain a clear separation between your UI design and data-handling logic.

Conclusion: Simplifying WPF DataGrid Column Formatting

Formatting DataGrid columns in WPF using the AutoGeneratingColumn event is a powerful technique that enhances your data presentation. By following the steps outlined in this guide, you can easily index columns and ensure your numeric data is displayed precisely as you desire, with rounded values where necessary.

Now that you have a better understanding of how to format DataGrid columns, you can enhance your WPF applications to present clear and aesthetically pleasing data to users. Happy coding!