/// <summary>
/// </summary>
public static Microsoft.AspNetCore.Blazor.RenderFragment ValidationMessageFor <T, V>(
this ModelStateDictionary <T> model,
Expression <Func <T, V> > Field,
object htmlAttributes = null,
Rendering.ICustomValidationMessage customValidationMessage = null)
{
var property = PropertyHelper <T> .GetProperty(Field);
var name = property.Name;
return((builder) =>
{
string errorDescription = model.GetValidationResults()?
.Where(x => ((IEnumerable <string>)x.MemberNames).Contains(name))
.Select(x => x.ErrorMessage)
.FirstOrDefault();
WriteMessage(customValidationMessage, builder, name, errorDescription, htmlAttributes);
});
}
private static void WriteMessage(Rendering.ICustomValidationMessage customMessage,
RenderTreeBuilder builder,
string name, string errorDescription, object htmlAttributes = null)
{
if (string.IsNullOrEmpty(errorDescription) == false)
{
if (customMessage != null)
{
customMessage.WriteValidationMessage(builder, name, errorDescription, htmlAttributes);
}
else
{
int sequence = 1;
builder.OpenElement(sequence++, "p");
builder.AddContent(sequence++, errorDescription);
builder.WriteHtmlAttributes(ref sequence, htmlAttributes);
builder.CloseElement();
}
}
}
