Скачать или смотреть How to Create and Delete Elements on XMLNode in C# with WinForms

Learn how to efficiently manage XML nodes in your C- WinForms application, including adding and removing elements like `phone2` with our easy-to-follow guide.
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Managing XML Elements in C- WinForms: Adding and Deleting Nodes

Working with XML in C- can seem daunting, especially if you're new to it. If you're developing a WinForms application, you may find yourself needing to create or delete XML elements dynamically. This guide will guide you through the process of adding or removing XML nodes in your C- application, focusing on a practical example involving a staff list with varying contact numbers.

Understanding the Problem

Imagine you have a simple XML structure representing staff information. Here's how it looks:

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

In this example:

Each staff element can contain different numbers of phone elements.

Your task is to work with this structure in a C- WinForms application, specifically to add a new phone element (phone2) if it does not exist, or remove it if it does.

Solution Overview

To manage XML nodes effectively, follow these steps:

Load the XML Document: Read the XML into an XmlDocument object.

Select Required Nodes: Use SelectNodes to retrieve nodes you want to manipulate.

Manipulate XML Elements: Create or delete elements as needed.

Save Changes: After modifying the XML structure, ensure changes are saved.

Step-by-Step Implementation

Let’s break down the implementation code with explanations for each part.

Loading XML Document

In your program.cs, first, make sure to initialize the XmlDocument:

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

Here, we create a static XmlDocument that will be used to load and modify your XML file.

Retrieving Specific Staff Node

Next, you can retrieve the staff node by ID using a simple method:

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

Adding or Removing Elements in Form

In your form1.cs, handle the button click to modify the staff member's data:

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

Here’s a breakdown of the button click handler:

You update existing elements like name and phone.

If phone2 does not exist, a new phone2 element is created, given inner text from textBoxPhone2, and appended to the staff node.

Saving the Changes

Although not shown in the click event, make sure you save the changes back to the XML file after modifications:

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

Conclusion

Manipulating XML in C- WinForms involves loading your XML structure, selecting the relevant nodes, and making changes as necessary. By following the outlined steps, you can easily add or delete XML elements on nodes, such as the phone2 node in our example. Use these principles and modify them as needed to fit your application.

Happy coding! If you have any questions or need further assistance, feel free to reach out in the comments below.