https://github.com/beto-rodriguez/EntityViews

A source generator to auto generate View Models.
https://github.com/beto-rodriguez/EntityViews

Last synced: 3 months ago
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A source generator to auto generate View Models.

• Host: GitHub
• URL: https://github.com/beto-rodriguez/EntityViews
• Owner: beto-rodriguez
• Created: 2024-01-26T15:44:50.000Z (10 months ago)
• Default Branch: master
• Last Pushed: 2024-02-24T04:04:39.000Z (9 months ago)
• Last Synced: 2024-06-12T12:17:54.356Z (5 months ago)
• Language: C#
• Homepage:
• Size: 319 KB
• Stars: 11
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-dotnet-maui - EntityViews - rodriguez/EntityViews?style=flat-square)](https://github.com/beto-rodriguez/EntityViews/stargazers)|[](https://github.com/beto-rodriguez/EntityViews/commits) (UI)

README

        
# EntityViews

This project generates ViewModels based on the models of the application using source generators.

The generated ViewModels implement `INotifyPropertyChanged` and re-use any `DataAnnotations` attribute to simplify the client-side validation by reducing boilerplate code.

## Example

Imagine we have a WebApi to build a TodoList (the next class is also a valid class for EntityFramework):

```c#

public class TodoItem

{

    public int Id { get; set; }

    [Required]

    [MaxLength(50)]

    public string Name { get; set; } = string.Empty;

    public bool IsComplete { get; set; }

}

```

Now we need to build a client so the user can populate the ToDo list, this projects uses source generators to build a ViewModel based on the previous object, the generated code 

will use the `Required` and `MaxLength` attributes to validate the object and quickly build the user interface.

This project generates a lot of boring, repeating, and neccessary code for us. the auto-generated view model will look like:

```c#

public partial class TodoItemViewModel : INotifyPropertyChanged

{

    private Dictionary _validationErrors = [];

    // ...

    private string _name = string.Empty;

    [Required]

    [MaxLength(50)]

    public string Name { get => _name; set => SetProperty(ref _name, value, nameof(Name)); }

    public string NameError => GetError("Name");

    public bool NameHasError => NameError.Length > 0;

    // ...

    public event PropertyChangedEventHandler? PropertyChanged;

    /// 

    /// Validates the view model and returns true if there are no validation errors.

    /// 

    public bool IsValid()

    {

        // ...

    }

    // ...

}

```

Finally we can quickily validate user interfaces in a client app:

![val](https://github.com/beto-rodriguez/EntityViews/assets/10853349/a7f0005c-318f-40c7-91ff-00973b9e1922)

In this case, it is a Maui client defined with the next XAML:

```xml

    

        

            

        

    

```