Скачать или смотреть How to Convert XSD Elements to a Dynamic Form in ASP.NET

Discover how to effectively convert XSD elements to a dynamic input form in ASP.NET, allowing automatic updates for changes in the XSD structure.
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This video is based on the question https://stackoverflow.com/q/217395/ asked by the user 'Murtaza Mandvi' ( https://stackoverflow.com/u/24958/ ) and on the answer https://stackoverflow.com/a/217409/ provided by the user 'Joel Coehoorn' ( https://stackoverflow.com/u/3043/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction: The Challenge of XSD to ASP.NET Forms

When working with data-driven applications, it often becomes necessary to translate XML Schema Definition (XSD) elements into user-friendly forms. In ASP.NET, many developers face the challenge of creating a dynamic input form that can automatically adjust to changes in the underlying XSD file. If a new field is added or an old one is removed in the XSD, the understanding leads to questions: Is there a standard way to make this change reflected on the web form immediately? Do I have to build this solution from scratch?

In this guide, we will explore how to approach this problem, leveraging existing tools and best practices.

Understanding the Solution: Using xsd.exe and ASP.NET Controls

While it’s true that there isn’t a fully automated built-in feature in ASP.NET to accomplish this task, we can get pretty close with the right approach. Here’s how:

Step 1: Generate Class Definitions from XSD

Use the xsd.exe Utility: This command line tool that comes bundled with Visual Studio is quite powerful.

It can create C# class definitions directly from your XSD files.

To use it, open a command prompt, navigate to your Visual Studio installation directory, and run the command as follows:

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

This command generates C# classes that mirror the structure defined in your XSD.

Step 2: Bind Data to Your ASP.NET Form

After generating the class definitions, the next step is to connect your dynamic form to these generated classes.

Create an ObjectDataSource:

In your ASP.NET Web Forms application, utilize the ObjectDataSource control which allows you to bind the data from your generated classes to the web form.

Set up the ObjectDataSource by specifying the type of the generated class.

Using The DetailsView Control:

The DetailsView control is ideal for displaying a single record of data, and it helps in binding to complex types effectively.

You can configure the DetailsView to automatically generate fields based on your data source.

Step 3: Implement Dynamic Updates

To ensure that changes in the XSD are reflected in the ASP.NET form:

Re-generate Classes: Whenever there are changes in the XSD file (like addition or removal of fields), simply run the xsd.exe command again to regenerate the C# classes.

Rebind the ObjectDataSource: After regenerating the classes, you may need to refresh the data binding on your form.

Additional Tips for Best Practices

Validation: Ensure that validations are in place for the generated fields to improve data integrity.

Styling: Customize the appearance of your forms to enhance user experience.

Version Control: Keep track of changes to your XSD schema to help manage versions and ensure compatibility with your application.

Conclusion: A Custom Yet Manageable Solution

While there may not be a fully automatic solution available out of the box for converting XSD elements into ASP.NET input forms, employing tools like xsd.exe combined with controls like ObjectDataSource and DetailsView allows developers to create a dynamic, easily maintainable solution. By following the steps outlined above, you can streamline your application's form creation process and ensure that it evolves alongside your data model.

If you're embarking on this journey for the first time, don't hesitate to revisit this guide and adapt it to your specific needs. Happy coding!