MudBlazor MudSelect validation - validation

Question

I have a simple MudBlazor MudSelect list
<MudSelect T="int" Label="Choose Coverage Type"
AnchorOrigin="Origin.BottomCenter" Variant="Variant.Outlined"
Margin="Margin.Dense" For="#(() => newLink.CoverageType)">
<MudSelectItem Value="0">No Coverage Selected</MudSelectItem>
<MudSelectItem Value="1">Auto</MudSelectItem>
<MudSelectItem Value="2">Cyber</MudSelectItem>
<MudSelectItem Value="3">D&O/EPL</MudSelectItem>
<MudSelectItem Value="4">General Liability</MudSelectItem>
<MudSelectItem Value="5">General Risk Management</MudSelectItem>
<MudSelectItem Value="6">Property</MudSelectItem>
</MudSelect>
In my class I have DataAnnotations for validation
//[RegularExpression ("^[1-6]$", ErrorMessage="A Coverage Type is Required")]
[Required]
public int CoverageType { get; set; }
I can get validation working on simple textboxes, but I want a validation error if the first item in the dropdown is slected "No Coverage Selected"
Does anyone know how to do this with the MudBlazor control? I have not found anything on their website.
Thanks for any help

Answer 1

You can try validating the field using the MudForm component.
Example:
https://try.mudblazor.com/snippet/QYQcaMkIrMqCiOQf
#using System.Text.RegularExpressions
#using System.ComponentModel.DataAnnotations
<MudForm #ref="form" class="my-3">
<MudSelect
T="int"
Label="Choose Coverage Type"
AnchorOrigin="Origin.BottomCenter"
Variant="Variant.Outlined"
Margin="Margin.Dense"
For="#(() => newLink.CoverageType)">
<MudSelectItem Value="0">No Coverage Selected</MudSelectItem>
<MudSelectItem Value="1">Auto</MudSelectItem>
<MudSelectItem Value="2">Cyber</MudSelectItem>
<MudSelectItem Value="3">D&O/EPL</MudSelectItem>
<MudSelectItem Value="4">General Liability</MudSelectItem>
<MudSelectItem Value="5">General Risk Management</MudSelectItem>
<MudSelectItem Value="6">Property</MudSelectItem>
</MudSelect>
</MudForm>
<MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="#(()=>form.Validate())">Validate</MudButton>
<MudButton Variant="Variant.Filled" Color="Color.Error" OnClick="#(()=>form.Reset())">Reset</MudButton>
<MudButton Variant="Variant.Filled" OnClick="#(()=>form.ResetValidation())">Reset Validation</MudButton>
#code {
private YourModel newLink = new YourModel();
private MudForm form;
class YourModel
{
[RegularExpression ("^[1-6]$", ErrorMessage="A Coverage Type is Required")]
[Required]
public int CoverageType { get; set; }
}
}