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validateModel.mustache
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validateModel.mustache
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using System.ComponentModel.DataAnnotations;
using System.Reflection;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.ModelBinding;
namespace {{packageName}}.Attributes
{
/// <summary>
/// Model state validation attribute
/// </summary>
public class ValidateModelStateAttribute : ActionFilterAttribute
{
/// <summary>
/// Called before the action method is invoked
/// </summary>
/// <param name="context"></param>
public override void OnActionExecuting(ActionExecutingContext context)
{
// Per https://blog.markvincze.com/how-to-validate-action-parameters-with-dataannotation-attributes/
var descriptor = context.ActionDescriptor as ControllerActionDescriptor;
if (descriptor != null)
{
foreach (var parameter in descriptor.MethodInfo.GetParameters())
{
object args = null;
if (context.ActionArguments.ContainsKey(parameter.Name))
{
args = context.ActionArguments[parameter.Name];
}
ValidateAttributes(parameter, args, context.ModelState);
}
}
if (!context.ModelState.IsValid)
{
context.Result = new BadRequestObjectResult(context.ModelState);
}
}
private void ValidateAttributes(ParameterInfo parameter, object args, ModelStateDictionary modelState)
{
foreach (var attributeData in parameter.CustomAttributes)
{
var attributeInstance = parameter.GetCustomAttribute(attributeData.AttributeType);
var validationAttribute = attributeInstance as ValidationAttribute;
if (validationAttribute != null)
{
var isValid = validationAttribute.IsValid(args);
if (!isValid)
{
modelState.AddModelError(parameter.Name, validationAttribute.FormatErrorMessage(parameter.Name));
}
}
}
}
}
}