MVC ICollection<IFormFile> ValidationState always set to Skipped

MVC ICollection<IFormFile> ValidationState always set to Skipped

In ASP.NET Core MVC, the ValidationState property of a ModelStateDictionary object is used to track the validation state of model properties. The ValidationState property can have one of the following values: Unvalidated, Invalid, Valid, or Skipped.

When working with an ICollection<IFormFile> property in a model, you may find that the ValidationState is always set to Skipped. This is because the ICollection<IFormFile> type is a complex type that doesn't have any validators associated with it by default. Therefore, the model binding system skips validation for this type.

To validate an ICollection<IFormFile> property, you can create a custom validator that implements the IModelValidator interface. Here's an example of how to do this:

public class RequiredFilesAttribute : ValidationAttribute, IModelValidator { public RequiredFilesAttribute() { ErrorMessage = "At least one file is required."; } public void Validate(ModelValidationContext context) { var files = context.Model as ICollection<IFormFile>; if (files == null || files.Count == 0) { context.ModelState.AddModelError(context.ModelName, ErrorMessage); } } }

In this example, the RequiredFilesAttribute class is a custom validation attribute that checks if an ICollection<IFormFile> property contains at least one file. The class also implements the IModelValidator interface, which allows it to be used as a model validator.

To use this custom validator, you can decorate your ICollection<IFormFile> property with the [RequiredFiles] attribute, like this:

public class MyModel { [RequiredFiles] public ICollection<IFormFile> Files { get; set; } }

Now, when you submit a form that includes a Files property with no files selected, the ModelState object will contain an error for the Files property, and the ValidationState will be set to Invalid.

Examples

  1. "MVC ICollection<IFormFile> ValidationState always Skipped"

    • Description: Explore reasons and solutions for the ValidationState of ICollection<IFormFile> always being set to Skipped in MVC model validation.
    • Code:
      // In your MVC model class [BindProperty] public ICollection<IFormFile> Files { get; set; }

  2. "MVC ICollection<IFormFile> model validation Skipped"

    • Description: Troubleshoot issues with model validation for ICollection<IFormFile> in MVC, where ValidationState is consistently set to Skipped.
    • Code:
      // In your MVC controller action [HttpPost] public IActionResult Upload(YourViewModel model) { // Your upload logic }

  3. "MVC IFormFileCollection ValidationState Skipped"

    • Description: Investigate and fix instances where ValidationState remains Skipped for IFormFileCollection in MVC model binding and validation.
    • Code:
      // In your MVC model class [BindProperty] public IFormFileCollection Files { get; set; }

  4. "MVC IFormFileCollection model validation always Skipped"

    • Description: Understand and resolve the persistent issue of model validation being skipped for IFormFileCollection in MVC.
    • Code:
      // In your MVC controller action [HttpPost] public IActionResult Upload(YourViewModel model) { // Your upload logic }

  5. "MVC ICollection<IFormFile> validation not working"

    • Description: Address scenarios where model validation fails to work for ICollection<IFormFile> in MVC, leading to ValidationState being set to Skipped.
    • Code:
      // In your MVC model class [BindProperty] [Required(ErrorMessage = "Please select at least one file.")] public ICollection<IFormFile> Files { get; set; }

  6. "MVC ICollection<IFormFile> ModelState.IsValid always false"

    • Description: Investigate and resolve situations where ModelState.IsValid is consistently false for ICollection<IFormFile> in MVC model validation.
    • Code:
      // In your MVC controller action [HttpPost] public IActionResult Upload(YourViewModel model) { if (ModelState.IsValid) { // Your upload logic } // Handle validation errors return View(model); }

  7. "MVC IFormFileCollection Validation always Skipped"

    • Description: Troubleshoot and fix cases where model validation for IFormFileCollection in MVC consistently skips validation, setting ValidationState to Skipped.
    • Code:
      // In your MVC model class [BindProperty] public IFormFileCollection Files { get; set; }

  8. "MVC IFormFileCollection model validation not firing"

    • Description: Identify and solve issues where model validation does not fire for IFormFileCollection in MVC, causing ValidationState to be Skipped.
    • Code:
      // In your MVC controller action [HttpPost] public IActionResult Upload(YourViewModel model) { // Your upload logic }

  9. "MVC ICollection<IFormFile> custom validation not working"

    • Description: Implement and troubleshoot custom validation for ICollection<IFormFile> in MVC when the default validation seems to be consistently skipped.
    • Code:
      // In your MVC model class [BindProperty] [FileCountValidation(ErrorMessage = "Please select at least one file.")] public ICollection<IFormFile> Files { get; set; }

  10. "MVC IFormFileCollection ModelState.IsValid always false"

    • Description: Address situations where ModelState.IsValid is always false for IFormFileCollection in MVC, leading to skipped validation.
    • Code:
      // In your MVC controller action [HttpPost] public IActionResult Upload(YourViewModel model) { if (ModelState.IsValid) { // Your upload logic } // Handle validation errors return View(model); }

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