I'm getting the EditContext from CascadingParameter
[CascadingParameter]
public EditContext EditContext { get; set; }
And I realized that exists a .Validate method, that validates the entire Model of EditForm.
But I want to validate only one field of the Model.
Who can I validate only one field of the Model from EditForm?
If you are wondering why I want this... Is because I'm making a custom component that when the value changes and it's a valid value, it will do something.
While looking at Peter Morris Library, I found out that if you want to validate non complex fields, you only need to create a FieldIdentifier and call EditContext.NotifyFieldChanged(fieldIdentifier) and it will trigger that field validation.
So the answer is much more simple:
// Get the FieldIdentifier with the EditContext from the field name
FieldIdentifier fieldIdentifier = EditContext.Field(fieldName);
// Validate the field when notifying change
EditContext.NotifyFieldChanged(fieldIdentifier);
// To check if the field is valid,
// check if there is any error message.
return !EditContext.GetValidationMessages(fieldIdentifier).Any();