.net中以扩展CheckBoxListFor为例

　　　　　public static MvcHtmlString CheckBoxListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> items, object htmlAttributes) { var result = new StringBuilder(); string name = ExpressionHelper.GetExpressionText(expression); var modelData = ModelMetadata.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData).Model; List<string> currentValues = StringHelper.StringSplit<string>(modelData == null ? string.Empty : modelData.ToString()); foreach (var item in items) { if (currentValues.Contains(item.Value)) result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\" checked><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); else result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\"><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); } return MvcHtmlString.Create(result.ToString()); }

netcore 2中以扩展CheckBoxListFor为例

　　　　public static IHtmlContent CheckBoxListFor<TModel, TProperty> (this IHtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> items, object htmlAttributes) { var result = new StringBuilder(); string name = ExpressionHelper.GetExpressionText(expression); var modelData = ExpressionMetadataProvider.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData, htmlHelper.MetadataProvider).Model; List<string> currentValues = StringHelper.StringSplit<string>(modelData == null ? string.Empty : modelData.ToString()); foreach (var item in items) { if (currentValues.Contains(item.Value)) result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\" checked><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); else result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\"><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); } return new HtmlString(result.ToString()); }

netcore 3中以扩展CheckBoxListFor为例

　　　　public static IHtmlContent CheckBoxListFor<TModel, TProperty> (this IHtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> items, object htmlAttributes) { var result = new StringBuilder(); ModelExpressionProvider modelExpressionProvider = (ModelExpressionProvider)htmlHelper.ViewContext.HttpContext.RequestServices.GetService(typeof(IModelExpressionProvider)); var modelData = modelExpressionProvider.CreateModelExpression(htmlHelper.ViewData, expression).Model; var name=modelExpressionProvider.GetExpressionText(expression); List<string> currentValues = ((modelData == null) ? string.Empty : modelData.ToString()).Split<string>(Array.Empty<string>()); foreach (var item in items) { if (currentValues.Contains(item.Value)) result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\" checked><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); else result.AppendFormat("<label class=\"checkbox-inline checkbox-styled\"><input type=\"checkbox\" name=\"{0}\" value=\"{1}\"><span class=‘text‘>{2}</span></label>", name, item.Value, item.Text); } return new HtmlString(result.ToString()); }

net netcore2 netcore3 HtmlHelper扩展（checkboxlistfor)为例

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原文地点：https://www.cnblogs.com/zzxulong/p/12174575.html