protected void ValidateModelState()
{
if (!ModelState.IsValid)
{
ModelErrorCollection modelErrorList = ModelState.Select(x => x.Value.Errors).Where(y => y.Count > 0).FirstOrDefault();
ModelError modelError = modelErrorList?.FirstOrDefault();
if (modelError != null)
{
throw modelError.Exception;
}
}
}
/// <summary>
/// 根据指定的属性名或模型对象的名称，从模型错误中显示一个错误信息对应的HTML标记。
/// </summary>
/// <param name="helper">HTML帮助器实例。</param>
/// <param name="modelName">所验证的属性或模型对象的名称。</param>
/// <param name="htmlAttributes">包含元素 HTML 特性的对象。</param>
/// <returns></returns>
public static MvcHtmlString PropertyValidationMessage(this HtmlHelper helper, string modelName,
object htmlAttributes)
{
modelName = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(modelName);
if (!helper.ViewData.ModelState.ContainsKey(modelName))
{
return(null);
}
ModelState modelState = helper.ViewData.ModelState[modelName];
ModelErrorCollection modelErrors = (modelState == null) ? null : modelState.Errors;
ModelError modelError = (((modelErrors == null) || (modelErrors.Count == 0)) ? null : modelErrors.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ?? modelErrors[0]);
if (modelError == null)
{
return(null);
}
TagBuilder builder = new TagBuilder("label");
builder.MergeAttributes(HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
builder.AddCssClass("error");
builder.MergeAttribute("id", $"{modelName}-error");
builder.MergeAttribute("for", modelName);
var iTag = new TagBuilder("i");
iTag.AddCssClass("fa fa-times-circle");
builder.InnerHtml = iTag.ToString(TagRenderMode.Normal) + GetUserErrorMessageOrDefault(helper.ViewContext.HttpContext, modelError, modelState);
return(new MvcHtmlString(builder.ToString(TagRenderMode.Normal)));
}
private static MvcHtmlString ValidationMessageHelper(this HtmlHelper htmlHelper, ModelMetadata modelMetadata, string expression, string validationMessage, IDictionary <string, object> htmlAttributes, string tag)
{
string modelName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(expression);
FormContext formContext = htmlHelper.ViewContext.GetFormContextForClientValidation();
if (!htmlHelper.ViewData.ModelState.ContainsKey(modelName) && formContext == null)
{
return(null);
}
ModelState modelState = htmlHelper.ViewData.ModelState[modelName];
ModelErrorCollection modelErrors = (modelState == null) ? null : modelState.Errors;
ModelError modelError = (((modelErrors == null) || (modelErrors.Count == 0)) ? null : modelErrors.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ?? modelErrors[0]);
if (modelError == null && formContext == null)
{
return(null);
}
if (String.IsNullOrEmpty(tag))
{
tag = htmlHelper.ViewContext.ValidationMessageElement;
}
TagBuilder builder = new TagBuilder(tag);
builder.MergeAttributes(htmlAttributes);
builder.AddCssClass((modelError != null) ? HtmlHelper.ValidationMessageCssClassName : HtmlHelper.ValidationMessageValidCssClassName);
if (!String.IsNullOrEmpty(validationMessage))
{
builder.SetInnerText(validationMessage);
}
else if (modelError != null)
{
builder.SetInnerText(GetUserErrorMessageOrDefault(htmlHelper.ViewContext.HttpContext, modelError, modelState));
}
if (formContext != null)
{
bool replaceValidationMessageContents = String.IsNullOrEmpty(validationMessage);
if (htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled)
{
builder.MergeAttribute("data-valmsg-for", modelName);
builder.MergeAttribute("data-valmsg-replace", replaceValidationMessageContents.ToString().ToLowerInvariant());
}
else
{
FieldValidationMetadata fieldMetadata = ApplyFieldValidationMetadata(htmlHelper, modelMetadata, modelName);
// rules will already have been written to the metadata object
fieldMetadata.ReplaceValidationMessageContents = replaceValidationMessageContents; // only replace contents if no explicit message was specified
// client validation always requires an ID
builder.GenerateId(modelName + "_validationMessage");
fieldMetadata.ValidationMessageId = builder.Attributes["id"];
}
}
return(builder.ToMvcHtmlString(TagRenderMode.Normal));
}
public static MvcHtmlString ValidationMessageCustom(this HtmlHelper htmlHelper, string modelName)
{
//<span class="text-danger field-validation-error" data-valmsg-for="@field.Name" data-valmsg-replace="true">
//@if(!ViewData.ModelState.IsValid && ViewData.ModelState[field.Name] != null && ViewData.ModelState[field.Name].Errors.Count > 0)
//{
// <span for= "@field.Name" class="">@ViewData.ModelState[field.Name].Errors.First().ErrorMessage</span>
//}
//</span>
TagBuilder builder = new TagBuilder("span");
builder.AddCssClass("text-danger");
builder.AddCssClass("field-validation-error");
builder.Attributes.Add("data-valmsg-for", modelName);
builder.Attributes.Add("data-valmsg-replace", "true");
ModelState modelState = htmlHelper.ViewData.ModelState[modelName];
ModelErrorCollection modelErrors = (modelState == null) ? null : modelState.Errors;
ModelError modelError = (((modelErrors == null) || (modelErrors.Count == 0)) ? null : modelErrors.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ?? modelErrors[0]);
if (htmlHelper.ViewData.ModelState.IsValid && modelError != null)
{
TagBuilder errorMessageSpan = new TagBuilder("span");
errorMessageSpan.Attributes.Add("for", modelName);
errorMessageSpan.SetInnerText(modelError.ErrorMessage);
builder.InnerHtml = errorMessageSpan.ToString();
}
return(MvcHtmlString.Create(builder.ToString(TagRenderMode.Normal)));
}
private static MvcHtmlString CollectionValidationMessageHelper(this HtmlHelper htmlHelper, ModelMetadata modelMetadata, string expression, IDictionary <string, object> htmlAttributes, string tag)
{
bool isClientSideValidationEnabled = htmlHelper.ViewContext.ClientValidationEnabled;
string propertyName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(expression);
if (!htmlHelper.ViewData.ModelState.ContainsKey(propertyName) && !isClientSideValidationEnabled)
{
return(null);
}
ModelState modelState = htmlHelper.ViewData.ModelState[propertyName];
ModelErrorCollection modelErrors = (modelState == null) ? null : modelState.Errors;
ModelError modelError = (((modelErrors == null) || (modelErrors.Count == 0)) ? null : modelErrors.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ?? modelErrors[0]);
if (modelError == null && !isClientSideValidationEnabled)
{
return(null);
}
if (String.IsNullOrEmpty(tag))
{
tag = "span";
}
TagBuilder html = new TagBuilder(tag);
html.MergeAttributes(htmlAttributes);
html.AddCssClass((modelError != null) ? HtmlHelper.ValidationMessageCssClassName : HtmlHelper.ValidationMessageValidCssClassName);
if (modelError != null)
{
html.InnerHtml = modelError.ErrorMessage;
}
if (isClientSideValidationEnabled)
{
Dictionary <string, object> validationAttributes = GetValidationAttributes(modelMetadata);
html.MergeAttributes(validationAttributes);
html.MergeAttribute("data-col-message-for", propertyName);
}
return(MvcHtmlString.Create(html.ToString()));
}
private static MvcHtmlString ExtendedValidationMessageHelper(this HtmlHelper htmlHelper,
ModelMetadata modelMetadata,
string expression, string validationMessage,
IDictionary <string, object> htmlAttributes)
{
var mvcHtmlString = ValidationMessageHelper(htmlHelper, modelMetadata, expression, validationMessage,
htmlAttributes);
string modelName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(expression);
FormContext formContext = GetFormContextForClientValidation(htmlHelper.ViewContext);
if (!htmlHelper.ViewData.ModelState.ContainsKey(modelName) && formContext == null)
{
return(mvcHtmlString);
}
ModelState modelState = htmlHelper.ViewData.ModelState[modelName];
var extendedModelState = modelState as ExtendedModelState;
ModelErrorCollection modelWarnings = null;
if (extendedModelState == null)
{
return(mvcHtmlString);
}
modelWarnings = extendedModelState.Warnings;
ModelError modelWarning = (((modelWarnings == null) || (modelWarnings.Count == 0))
? null
: modelWarnings.FirstOrDefault(m => !String.IsNullOrEmpty(m.ErrorMessage)) ??
modelWarnings[0]);
if (modelWarning == null)
{
return(mvcHtmlString);
}
var builder = new TagBuilder("span");
builder.MergeAttributes(htmlAttributes);
builder.AddCssClass(modelWarning != null
? HtmlHelpers.ValidationSummaryWarningCssClassName
: HtmlHelper.ValidationMessageValidCssClassName);
builder.SetInnerText(GetUserErrorMessageOrDefault(htmlHelper.ViewContext.HttpContext, modelWarning, modelState));
if (formContext != null)
{
bool replaceValidationMessageContents = String.IsNullOrEmpty(validationMessage);
if (htmlHelper.ViewContext.UnobtrusiveJavaScriptEnabled)
{
builder.MergeAttribute("data-valmsg-for", modelName);
builder.MergeAttribute("data-valmsg-replace",
replaceValidationMessageContents.ToString().ToLowerInvariant());
}
else
{
FieldValidationMetadata fieldMetadata = ApplyFieldValidationMetadata(htmlHelper, modelMetadata,
modelName);
// rules will already have been written to the metadata object
fieldMetadata.ReplaceValidationMessageContents = replaceValidationMessageContents;
// only replace contents if no explicit message was specified
// client validation always requires an ID
builder.GenerateId(modelName + "_validationMessage");
fieldMetadata.ValidationMessageId = builder.Attributes["id"];
}
}
var mvcHtmlStringWithWarning =
MvcHtmlString.Create((mvcHtmlString == null ? string.Empty : mvcHtmlString.ToHtmlString()) +
builder.ToString(TagRenderMode.Normal));
return(mvcHtmlStringWithWarning);
}
