如何通过c#在HTML . validationsummary()中获得HTML或新行/重载返回

本文关键字：HTML 新行 返回 重载 何通过 validationsummary | 更新日期: 2023-09-27 17:49:42

如果不编写一些疯狂的扩展方法(我不打算这样做)，这可能是不可能的。我知道ValidationSummary()是为了安全而编码的。我只是好奇，如果我错过了一些明显…?

我有一个简单的<%= Html.ValidationSummary() %>在我的形式。在某些情况下，会抛出错误，如果我能对错误的出现有更多的控制，那就太好了。

例如，当我导入CSV文件时，如果标题不是可接受的格式或包含特殊字符，我会向ValidationSummary()抛出以下错误:

constraintValidatorContext.AddInvalid(invalidHeaders.Count() == 1
                        ? string.Format("The following column header is invalid: {0}.", badHeaders)
                        : string.Format("There were multiple invalid column headers including: {0}.", badHeaders), "General");

如果我能在一个列表中显示多个标头就太好了，如下所示:

string.Format("There were multiple invalid column headers including: <li>{0}</li>", badHeaders)

显示HTML。即使我可以在这里或那里扔一个换行，这将是有帮助的('n 'r)…是我不知道什么吗?

如何通过c#在HTML . validationsummary()中获得HTML或新行/重载返回

换行符在HTML中没有作用，您需要<br />标记。

你总是可以滚动你自己的，以获得更多的控制输出。下面是该帮助器的MVC2源代码。它基本上是通过

public static MvcHtmlString ValidationSummary(this HtmlHelper htmlHelper, bool excludePropertyErrors, string message, IDictionary<string, object> htmlAttributes) {
        if (htmlHelper == null) {
            throw new ArgumentNullException("htmlHelper");
        }
        FormContext formContext = htmlHelper.ViewContext.GetFormContextForClientValidation();
        if (formContext == null && htmlHelper.ViewData.ModelState.IsValid) {
            return null;
        }
        string messageSpan;
        if (!String.IsNullOrEmpty(message)) {
            TagBuilder spanTag = new TagBuilder("span");
            spanTag.SetInnerText(message);
            messageSpan = spanTag.ToString(TagRenderMode.Normal) + Environment.NewLine;
        }
        else {
            messageSpan = null;
        }
        StringBuilder htmlSummary = new StringBuilder();
        TagBuilder unorderedList = new TagBuilder("ul");
        IEnumerable<ModelState> modelStates = null;
        if (excludePropertyErrors) {
            ModelState ms;
            htmlHelper.ViewData.ModelState.TryGetValue(htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix, out ms);
            if (ms != null) {
                modelStates = new ModelState[] { ms };
            }
        }
        else {
            modelStates = htmlHelper.ViewData.ModelState.Values;
        }
        if (modelStates != null) {
            foreach (ModelState modelState in modelStates) {
                foreach (ModelError modelError in modelState.Errors) {
                    string errorText = GetUserErrorMessageOrDefault(htmlHelper.ViewContext.HttpContext, modelError, null /* modelState */);
                    if (!String.IsNullOrEmpty(errorText)) {
                        TagBuilder listItem = new TagBuilder("li");
                        listItem.SetInnerText(errorText);
                        htmlSummary.AppendLine(listItem.ToString(TagRenderMode.Normal));
                    }
                }
            }
        }
        if (htmlSummary.Length == 0) {
            htmlSummary.AppendLine(_hiddenListItem);
        }
        unorderedList.InnerHtml = htmlSummary.ToString();
        TagBuilder divBuilder = new TagBuilder("div");
        divBuilder.MergeAttributes(htmlAttributes);
        divBuilder.AddCssClass((htmlHelper.ViewData.ModelState.IsValid) ? HtmlHelper.ValidationSummaryValidCssClassName : HtmlHelper.ValidationSummaryCssClassName);
        divBuilder.InnerHtml = messageSpan + unorderedList.ToString(TagRenderMode.Normal);
        if (formContext != null) {
            // client val summaries need an ID
            divBuilder.GenerateId("validationSummary");
            formContext.ValidationSummaryId = divBuilder.Attributes["id"];
            formContext.ReplaceValidationSummary = !excludePropertyErrors;
        }
        return divBuilder.ToMvcHtmlString(TagRenderMode.Normal);
    }

ValidationSummaryValidCssClassName为" validate -summary-errors"， ValidationSummaryValidCssClassName为" validate -summary-valid"。

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