MVC3 - 通过换行来ModelState.AddModelError [英] MVC3 - passing NEW-LINE to ModelState.AddModelError
问题描述
在上后端发生了错误，MVC的控制器经结果，返回的消息 ModelState.AddModelError（，消息）;
我想有一个信息在2号线 显示，所以我想提出一个 \\ r \\ n 结果
或 ＆LT; BR /＆gt;中。 之间
我用剃刀来显示使用 @ Html.ValidationSummary（）消息; 结果
但是从查看HTML输出显示为 ＆放大器; LT; BR /＆放大器; GT;
什么是传递信息的新行并获得最佳方式，除$ P $在HTML输出电平PTED成为一个真正的结果标签？
================================结果
控制器code：
ModelState.AddModelError（，一线474; BR /＆GT;两线）;
返回Request.IsAjaxRequest（）？ （ActionResult的）PartialView（视图名，模型）
查看（模型）;
查看code：
@using（Ajax.BeginForm（指数，家，新AjaxOptions {UpdateTargetId =TV}））
{
@if（Html.ValidationSummary（）！= NULL）
@ Html.Raw（Server.HtmlDe code（Html.ValidationSummary（真）的ToString（））） ....
}
在ValidationSummary助手HTML EN codeS错误信息，这是由设计。这意味着你不能使用HTML标记，因为他们将连接codeD。所以，你可以写一个自定义帮助它不带code：
公共静态类ValidationExtensions
{
公共静态IHtmlString MyValidationSummary（此的HtmlHelper的HtmlHelper）
{
VAR formContextForClientValidation = htmlHelper.ViewContext.ClientValidationEnabled？ htmlHelper.ViewContext.FormContext：空;
如果（htmlHelper.ViewData.ModelState.IsValid）
{
如果（formContextForClientValidation == NULL）
{
返回null;
}
如果（htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled）
{
返回null;
}
} StringBuilder的VAR =新的StringBuilder（）;
VAR ulBuilder =新TagBuilder（UL）; ModelState中的ModelState;
如果（htmlHelper.ViewData.ModelState.TryGetValue（htmlHelper.ViewData.TemplateInfo.HtmlField preFIX，出来的ModelState））
{
的foreach（在modelState.Errors ModelError误差）
{
字符串userErrorMessageOrDefault = error.ErrorMessage;
如果（！string.IsNullOrEmpty（userErrorMessageOrDefault））
{
VAR liBuilder =新TagBuilder（「李先生」）;
liBuilder.InnerHtml = userErrorMessageOrDefault;
stringBuilder.AppendLine（liBuilder.ToString（TagRenderMode.Normal））;
}
}
} 如果（stringBuilder.Length == 0）
{
stringBuilder.AppendLine（＆LT;黎族风情= \\显示：无\\＆GT;＆LT; /李＆GT;）;
}
ulBuilder.InnerHtml = stringBuilder.ToString（）; TagBuilder divBuilder =新TagBuilder（分区）;
divBuilder.AddCssClass（htmlHelper.ViewData.ModelState.IsValid HtmlHelper.ValidationSummaryValidCssClassName：HtmlHelper.ValidationSummaryCssClassName）;
divBuilder.InnerHtml = ulBuilder.ToString（TagRenderMode.Normal）;
如果（formContextForClientValidation！= NULL）
{
如果（！htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled）
{
divBuilder.GenerateId（的ValidationSummary）;
formContextForClientValidation.ValidationSummaryId = divBuilder.Attributes [ID];
formContextForClientValidation.ReplaceValidationSummary = FALSE;
}
}
返回新HtmlString（divBuilder.ToString（TagRenderMode.Normal））;
}
}
和则：
@ Html.MyValidationSummary（）
这是我们自定义的助手以下行其中明确不带HTML code：
liBuilder.InnerHtml = userErrorMessageOrDefault;
在原来的助手，它看起来是这样的：
liBuilder.SetInnerText（userErrorMessageOrDefault）;
When an error occurs on the back-end, the MVC controller returns a message via the
ModelState.AddModelError("", "message");
I would like to have that 'message' display in 2 lines, so I would like to put a "\r\n"
or a "<br />" in between.
I'm using Razor to display the Message using @Html.ValidationSummary();
But the HTML Output from the View displays that as <br/>
What is the best way to pass New-Lines on a message and get it interpreted into a real
tag at the HTML output level?
================================
Controller code:
ModelState.AddModelError("", "Line one <br /> Line two.");
return Request.IsAjaxRequest() ? (ActionResult) PartialView("ViewName", model)
: View(model);
View code:
@using (Ajax.BeginForm("Index", "Home", new AjaxOptions { UpdateTargetId = "tv" }))
{
@if (Html.ValidationSummary() != null)
@Html.Raw(Server.HtmlDecode(Html.ValidationSummary(true).ToString()))
....
}
The ValidationSummary helper HTML encodes error messages and this is by design. It means that you cannot use HTML tags as they will be encoded. So you could write a custom helper which doesn't encode:
public static class ValidationExtensions
{
public static IHtmlString MyValidationSummary(this HtmlHelper htmlHelper)
{
var formContextForClientValidation = htmlHelper.ViewContext.ClientValidationEnabled ? htmlHelper.ViewContext.FormContext : null;
if (htmlHelper.ViewData.ModelState.IsValid)
{
if (formContextForClientValidation == null)
{
return null;
}
if (htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled)
{
return null;
}
}
var stringBuilder = new StringBuilder();
var ulBuilder = new TagBuilder("ul");
ModelState modelState;
if (htmlHelper.ViewData.ModelState.TryGetValue(htmlHelper.ViewData.TemplateInfo.HtmlFieldPrefix, out modelState))
{
foreach (ModelError error in modelState.Errors)
{
string userErrorMessageOrDefault = error.ErrorMessage;
if (!string.IsNullOrEmpty(userErrorMessageOrDefault))
{
var liBuilder = new TagBuilder("li");
liBuilder.InnerHtml = userErrorMessageOrDefault;
stringBuilder.AppendLine(liBuilder.ToString(TagRenderMode.Normal));
}
}
}
if (stringBuilder.Length == 0)
{
stringBuilder.AppendLine("<li style=\"display:none\"></li>");
}
ulBuilder.InnerHtml = stringBuilder.ToString();
TagBuilder divBuilder = new TagBuilder("div");
divBuilder.AddCssClass(htmlHelper.ViewData.ModelState.IsValid ? HtmlHelper.ValidationSummaryValidCssClassName : HtmlHelper.ValidationSummaryCssClassName);
divBuilder.InnerHtml = ulBuilder.ToString(TagRenderMode.Normal);
if (formContextForClientValidation != null)
{
if (!htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled)
{
divBuilder.GenerateId("validationSummary");
formContextForClientValidation.ValidationSummaryId = divBuilder.Attributes["id"];
formContextForClientValidation.ReplaceValidationSummary = false;
}
}
return new HtmlString(divBuilder.ToString(TagRenderMode.Normal));
}
}
and then:
@Html.MyValidationSummary()
It is the following line in our custom helper which explicitly doesn't HTML encode:
liBuilder.InnerHtml = userErrorMessageOrDefault;
In the original helper it looks like this:
liBuilder.SetInnerText(userErrorMessageOrDefault);
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