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[英]C# MVC Razor Html.ValidationSummary show message as HTML
[英]How do I get HTML or New Line / Carraige Return in Html.ValidationSummary() via C#?
如果不編寫一些我不打算這樣做的瘋狂擴展方法,這可能是不可能的。 我知道ValidationSummary()
是為安全而編碼的。 我只是想知道我是否缺少明顯的東西 ...?
我的表單中有一個簡單的<%= Html.ValidationSummary() %>
。 在某些情況下,會引發錯誤,如果我可以對錯誤的出現有更多的控制,那就太好了。
例如,當我導入CSV文件時,如果標頭的格式不正確或包含特殊字符,則會向ValidationSummary()
拋出以下錯誤:
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");
如果可以在列表中顯示多個標頭,如下所示 :
string.Format("There were multiple invalid column headers including: <li>{0}</li>", badHeaders)
這將顯示HTML。 即使我可以在此處或此處輸入換行符,也會有所幫助(\\ n \\ r) ...我只是不了解某些內容嗎?
換行符在HTML中無效,您需要一個<br />
標簽。
您總是可以自己滾動來獲得對輸出的更多控制。 這是該幫助器的MVC2源。 它基本上通過
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”,而ValidationSummaryValidCssClassName是“ validation-summary-valid”。
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