InputSelect with empty option doesn't validate int

[giarico]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When i submit the form, if I don't change the value of the select, I have no validation error.
If I change value and go back to the empty choice, the error is shown.

public class MyModel
{
    [Required]
    public int MyProperty { get; set; }
}

<EditForm Model="model" OnValidSubmit="HandleValidSubmit">

    <DataAnnotationsValidator />
    <ValidationSummary />

    <InputSelect @bind-Value="model.MyProperty">
        <option></option>
        <option value="1">1</option>
        <option value="2">2</option>
    </InputSelect>

    <button type="submit">Save</button>
</EditForm>

@code 
{
    MyModel model = new();

    void HandleValidSubmit()
    {
        
    }
}

This is when you click insert without changing option

This is when you click insert changing option and going back to the empty choice

Expected Behavior

The validation should trigger also when I don't modify the choice

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

7

Anything else?

No response

[javiercn]

@giarico thanks for contacting us.

Validation works in terms of the value in C# and not the value in the form. Since an int is a value type, it always has a value and hence Required validation always passes. You need to use int? to model that behavior, otherwise the absence of a value can't be distinguished from a valid value.

See here for more guidance

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