Question

如果不编写一些我不打算做的疯狂扩展方法，这可能是不可能的。我知道ValidationSummary()是为了安全而编码的。 我只是好奇我是否遗漏了明显的东西......？

我的表单中有一个简单的<%= Html.ValidationSummary() %>。对于某些情况，会抛出错误，如果我可以对错误的外观有更多的控制，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，我会将以下错误抛给ValidationSummary()：

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");

如果我能够在列表中显示多个标题，那将会膨胀：

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

这会显示HTML。 即使我可以在这里或那里投入NewLine，也会有所帮助（\ n \ r） ......我只是不知道什么？

Answer 1

新行在HTML中无效，您需要<br />标记。

您可以随时自行滚动以获得对输出的更多控制权。这是帮助程序的MVC2源代码。它基本上通过

来看

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是“validation-summary-errors”，ValidationSummaryValidCssClassName是“validation-summary-valid”。

如何通过C＃在Html.ValidationSummary（）中获取HTML或换行/回车？

1 个答案: