在ASP.net核心MVC3.1的HtmlHelper扩展方法中使用DataAnnotation本地化程序

var supportedCultures = new[] { new CultureInfo("zh-CN") };
app.UseRequestLocalization(new RequestLocalizationOptions
{
    DefaultRequestCulture = new RequestCulture("zh-CN"),
    SupportedCultures = supportedCultures,
    SupportedUICultures = supportedCultures
});

using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using System;
using System.Linq.Expressions;

namespace YourNamespace
{
    public static class HtmlHelperExtensions
    {
        public static IHtmlContent LocalizedValidationMessageFor<TModel, TProperty>(
            this IHtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TProperty>> expression)
        {
            var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
            var modelName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(
                ExpressionHelper.GetExpressionText(expression));
            var modelState = htmlHelper.ViewData.ModelState[modelName];
            var errorMessage = modelState?.Errors[0]?.ErrorMessage;

            if (!string.IsNullOrEmpty(errorMessage))
            {
                return htmlHelper.ValidationMessageFor(expression, errorMessage);
            }

            return htmlHelper.ValidationMessageFor(expression);
        }
    }
}

<div class="form-group">
    <label asp-for="Name"></label>
    <input asp-for="Name" class="form-control" />
    @Html.LocalizedValidationMessageFor(model => model.Name)
</div>