blocks|key|688840|text|在这里看这篇文章-应该包含你需要的大部分http://blogs.planetcloud.co.uk/mygreatdiscovery/post/Creating-tooltips-using-data-annotations-in-ASPNET-MVC.aspx|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|688841|public+static+MvcHtmlString+RequiredLabelFor<TModel,+TValue>(this+HtmlHelper<TModel>+helper,+Expression<Func<TModel,+TValue>>+expression)
{
++++var+metaData+=+ModelMetadata.FromLambdaExpression(expression,+helper.ViewData);

++++string+htmlFieldName+=+ExpressionHelper.GetExpressionText(expression);
++++string+labelText+=+metaData.DisplayName+??+metaData.PropertyName+??+htmlFieldName.Split('.').Last();

++++if+(metaData.IsRequired)
++++++++labelText+%2B=+"<span+class=\"required-field\">*</span>";

++++if+(String.IsNullOrEmpty(labelText))
++++++++return+MvcHtmlString.Empty;

++++var+label+=+new+TagBuilder("label");
++++label.Attributes.Add("for",+helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));

++++label.InnerHtml+=+labelText;
++++return+MvcHtmlString.Create(label.ToString());
}|code-block|syntax|javascript|688842|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.planetcloud.co.uk/mygreatdiscovery/post/Creating-tooltips-using-data-annotations-in-ASPNET-MVC.aspx^0|K|34|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>see this post here - should contain most of what you need
<a href="http://blogs.planetcloud.co.uk/mygreatdiscovery/post/Creating-tooltips-using-data-annotations-in-ASPNET-MVC.aspx" rel="noreferrer">http://blogs.planetcloud.co.uk/mygreatdiscovery/post/Creating-tooltips-using-data-annotations-in-ASPNET-MVC.aspx</a></p>

<pre><code>public static MvcHtmlString RequiredLabelFor&lt;TModel, TValue&gt;(this HtmlHelper&lt;TModel&gt; helper, Expression&lt;Func&lt;TModel, TValue&gt;&gt; expression)
{
    var metaData = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);

    string htmlFieldName = ExpressionHelper.GetExpressionText(expression);
    string labelText = metaData.DisplayName ?? metaData.PropertyName ?? htmlFieldName.Split('.').Last();

    if (metaData.IsRequired)
        labelText += "&lt;span class=\"required-field\"&gt;*&lt;/span&gt;";

    if (String.IsNullOrEmpty(labelText))
        return MvcHtmlString.Empty;

    var label = new TagBuilder("label");
    label.Attributes.Add("for", helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));

    label.InnerHtml = labelText;
    return MvcHtmlString.Create(label.ToString());
}
</code></pre>


blocks|key|688897|text|下面是一个描述如何做到这一点的blog+post。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|688898|给你一个从上面的站点修改的小例子(注意-我还没有编译/测试这个)：|688899|namespace+HelpRequest.Controllers.Helpers
{
+++public+static+class+LabelExtensions
++++{
++++++++public+static+MvcHtmlString+Label(this+HtmlHelper+html,+string+expression,+string+id+=+"",+bool+generatedId+=+false)
++++++++{
++++++++++++return+LabelHelper(html,+ModelMetadata.FromStringExpression(expression,+html.ViewData),+expression,+id,+generatedId);
++++++++}

++++++++[SuppressMessage("Microsoft.Design",+"CA1006:DoNotNestGenericTypesInMemberSignatures",+Justification+=+"This+is+an+appropriate+nesting+of+generic+types")]
++++++++public+static+MvcHtmlString+LabelFor<TModel,+TValue>(this+HtmlHelper<TModel>+html,+Expression<Func<TModel,+TValue>>+expression,+string+id+=+"",+bool+generatedId+=+false)
++++++++{
++++++++++++return+LabelHelper(html,+ModelMetadata.FromLambdaExpression(expression,+html.ViewData),+ExpressionHelper.GetExpressionText(expression),+id,+generatedId);
++++++++}

++++++++internal+static+MvcHtmlString+LabelHelper(HtmlHelper+html,+ModelMetadata+metadata,+string+htmlFieldName,+string+id,+bool+generatedId)
++++++++{
++++++++++++string+labelText+=+metadata.DisplayName+??+metadata.PropertyName+??+htmlFieldName.Split('.').Last();
++++++++++++if+(String.IsNullOrEmpty(labelText))
++++++++++++{
++++++++++++++++return+MvcHtmlString.Empty;
++++++++++++}
++++++++++++var+sb+=+new+StringBuilder();
++++++++++++sb.Append(labelText);
++++++++++++if+(metadata.IsRequired)
++++++++++++++++sb.Append("*");

++++++++++++var+tag+=+new+TagBuilder("label");
++++++++++++if+(!string.IsNullOrWhiteSpace(id))
++++++++++++{
++++++++++++++++tag.Attributes.Add("id",+id);
++++++++++++}
++++++++++++else+if+(generatedId)
++++++++++++{
++++++++++++++++tag.Attributes.Add("id",+html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName)+%2B+"_Label");
++++++++++++}

++++++++++++tag.Attributes.Add("for",+html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
++++++++++++tag.SetInnerText(sb.ToString());

++++++++++++return+MvcHtmlString.Create(tag.ToString(TagRenderMode.Normal));
++++++++}
++++}
}|code-block|syntax|javascript|688900|entityMap|0|LINK|mutability|MUTABLE|url|http://cru.caes.ucdavis.edu/blog/posts/its-magic/extend-mvc-labelfor-method^0|F|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<p>Here is an <a href="http://cru.caes.ucdavis.edu/blog/posts/its-magic/extend-mvc-labelfor-method" rel="noreferrer">blog post</a> that describes how to do this.</p>

<p>To give you a small example modified from the site above (note - I have not compiled/tested this):</p>

<pre><code>namespace HelpRequest.Controllers.Helpers
{
   public static class LabelExtensions
    {
        public static MvcHtmlString Label(this HtmlHelper html, string expression, string id = "", bool generatedId = false)
        {
            return LabelHelper(html, ModelMetadata.FromStringExpression(expression, html.ViewData), expression, id, generatedId);
        }

        [SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
        public static MvcHtmlString LabelFor&lt;TModel, TValue&gt;(this HtmlHelper&lt;TModel&gt; html, Expression&lt;Func&lt;TModel, TValue&gt;&gt; expression, string id = "", bool generatedId = false)
        {
            return LabelHelper(html, ModelMetadata.FromLambdaExpression(expression, html.ViewData), ExpressionHelper.GetExpressionText(expression), id, generatedId);
        }

        internal static MvcHtmlString LabelHelper(HtmlHelper html, ModelMetadata metadata, string htmlFieldName, string id, bool generatedId)
        {
            string labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
            if (String.IsNullOrEmpty(labelText))
            {
                return MvcHtmlString.Empty;
            }
            var sb = new StringBuilder();
            sb.Append(labelText);
            if (metadata.IsRequired)
                sb.Append("*");

            var tag = new TagBuilder("label");
            if (!string.IsNullOrWhiteSpace(id))
            {
                tag.Attributes.Add("id", id);
            }
            else if (generatedId)
            {
                tag.Attributes.Add("id", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName) + "_Label");
            }

            tag.Attributes.Add("for", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
            tag.SetInnerText(sb.ToString());

            return MvcHtmlString.Create(tag.ToString(TagRenderMode.Normal));
        }
    }
}
</code></pre>


blocks|key|905333|text|我这样做是因为我的必填字段必须是动态的(在配置文件中定义)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|905334|在视图末尾添加：|905335|++++<script+type="text/javascript">
++++++++$('input[type=text]').each(function+()+{
++++++++++++var+req+=+$(this).attr('data-val-required');
++++++++++++if+(undefined+!=+req)+{
++++++++++++++++var+label+=+$('label[for="'+%2B+$(this).attr('id')+%2B+'"]');
++++++++++++++++var+text+=+label.text();
++++++++++++++++if+(text.length+>+0)+{
++++++++++++++++++++label.append('<span+style="color:red">+*</span>');
++++++++++++++++}
++++++++++++}
++++++++});
++++</script>|code-block|syntax|javascript|905336|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>I did that way because my required fields must be dynamic (defined in a configuration file)</p>

<p>Add at the end of your View:</p>

<pre><code>    &lt;script type="text/javascript"&gt;
        $('input[type=text]').each(function () {
            var req = $(this).attr('data-val-required');
            if (undefined != req) {
                var label = $('label[for="' + $(this).attr('id') + '"]');
                var text = label.text();
                if (text.length &gt; 0) {
                    label.append('&lt;span style="color:red"&gt; *&lt;/span&gt;');
                }
            }
        });
    &lt;/script&gt;
</code></pre>


blocks|key|689122|text|您可以仅通过CSS将星号添加到必填字段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|689123|首先，为它创建一个CSS类：|689124|.required::after+
{
++++content:+"*";
++++font-weight:+bold;
++++color:+red;+
}|code-block|syntax|javascript|689125|这将在任何具有"required“类的元素上附加一个红色星号。|689126|然后，在您的视图中，只需将新类添加到您的标签：|689127|++++@Html.LabelFor(m+=>+m.Name,+new+{+@class="required"+})|689128|更好的方法可能是一个自定义的HTML+Helper，它可以识别字段是否具有必需的属性，如果有，则添加required+CSS类。|offset|length|style|CODE|689129|entityMap^0|0|0|0|0|0|0|1E|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|12|8|@$Q|13|R|14|S|T]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

<p>You can add an asterisk to a required field purely through CSS.</p>

<p>First, create a CSS class for it:</p>

<pre><code>.required::after 
{
    content: "*";
    font-weight: bold;
    color: red; 
}
</code></pre>

<p>This will append a red asterisk to any element with the "required" class.</p>

<p>Then, in your view, simply add the new class to your label:</p>

<pre><code>    @Html.LabelFor(m =&gt; m.Name, new { @class="required" })
</code></pre>

<p>Even better might be a custom HTML Helper that discerns if the field has a [Required] attribute, and if so, adds the <code>required</code> CSS class.</p>


blocks|key|689158|text|使用帮助器将样式类添加到标注|type|unstyled|depth|inlineStyleRanges|entityRanges|data|689159|public+static+MvcHtmlString+RequiredLabelFor<TModel,+TValue>(this+HtmlHelper<TModel>+html,+Expression<Func<TModel,+TValue>>+expression,+object+htmlAttributes)
{
++++var+metadata+=+ModelMetadata.FromLambdaExpression(expression,+html.ViewData);
++++var+resolvedLabelText+=+metadata.DisplayName+??+metadata.PropertyName;
++++if+(!metadata.IsRequired)
++++{
++++++++return+html.LabelFor(expression,+resolvedLabelText,+htmlAttributes);
++++}

++++var+attributes+=+HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
++++if+(attributes+==+null)
++++{
++++++++return+html.LabelFor(expression,+resolvedLabelText,+htmlAttributes);
++++}

++++const+string+requiredClass+=+"required-label";
++++if+(attributes.ContainsKey("class"))
++++{
++++++++var+classList+=+attributes["class"].ToString().Split('+').ToList();
++++++++classList.Add(requiredClass);
++++++++attributes["class"]+=+string.Join("+",+classList);
++++}
++++else
++++{
++++++++attributes.Add("class",+requiredClass);
++++}

++++return+html.LabelFor(expression,+resolvedLabelText,+attributes);
}|code-block|syntax|javascript|689160|然后，您可以设置类的样式：|689161|.required-label::after+{+content+:+"*"+}|689162|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Use helper to add style class to the label</p>

<pre><code>public static MvcHtmlString RequiredLabelFor&lt;TModel, TValue&gt;(this HtmlHelper&lt;TModel&gt; html, Expression&lt;Func&lt;TModel, TValue&gt;&gt; expression, object htmlAttributes)
{
    var metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
    var resolvedLabelText = metadata.DisplayName ?? metadata.PropertyName;
    if (!metadata.IsRequired)
    {
        return html.LabelFor(expression, resolvedLabelText, htmlAttributes);
    }

    var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
    if (attributes == null)
    {
        return html.LabelFor(expression, resolvedLabelText, htmlAttributes);
    }

    const string requiredClass = "required-label";
    if (attributes.ContainsKey("class"))
    {
        var classList = attributes["class"].ToString().Split(' ').ToList();
        classList.Add(requiredClass);
        attributes["class"] = string.Join(" ", classList);
    }
    else
    {
        attributes.Add("class", requiredClass);
    }

    return html.LabelFor(expression, resolvedLabelText, attributes);
}
</code></pre>

<p>Then you can style the class:</p>

<pre><code>.required-label::after { content : "*" }
</code></pre>


blocks|key|905467|text|我从其他一些帖子中将这一点联系在一起：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|905468|它适用于我，因为labelfor后面跟着一个输入和一个跨度(标签的输入和验证跨度)|905469|input[data-val-required]%2Bspan:before+{
++content:+"*";
++font-weight:+bold;
++color:+red;
++position:relative;
++top:-34px;
++left:-12px;
++font-size:14pt;
}|code-block|syntax|javascript|905470|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>I hobbled this together from some other posts:</p>

<p>It works for me since the labelfor is followed by an input plus a span (the input the label is for, and the validation span)</p>

<pre><code>input[data-val-required]+span:before {
  content: "*";
  font-weight: bold;
  color: red;
  position:relative;
  top:-34px;
  left:-12px;
  font-size:14pt;
}
</code></pre>


blocks|key|689267|text|基于Renato+Saito的上述回答和评论，以及添加$(.ready)文档和检查以确保我们添加的星号不超过一个(出于某种原因，我在我的一些字段中得到了星号)，我有以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|689268|//+Add+asterisks+to+required+fields
$(document).ready(function()+{
++++$("[data-val-required]").each(function+()+{
+++++++var+label+=+$('label[for="'+%2B+$(this).attr("id")+%2B+'"]');
++++++++var+asterisksHtml+=+'<span+style="color:red">&nbsp;*</span>';
++++++++if+(label.text().length+>+0+&&+label.html().indexOf(asterisksHtml)+===+-1)+{
++++++++++++label.append(asterisksHtml);
++++++++}
++++});
});|code-block|syntax|javascript|689269|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Based on the above answer by Renato Saito along with the comments, as well as adding $(document).ready and checking to make sure that we are not adding more than one asterisks (I'm getting that on some of my fields for some reason), I have this:</p>

<pre><code>// Add asterisks to required fields
$(document).ready(function() {
    $("[data-val-required]").each(function () {
       var label = $('label[for="' + $(this).attr("id") + '"]');
        var asterisksHtml = '&lt;span style="color:red"&gt;&amp;nbsp;*&lt;/span&gt;';
        if (label.text().length &gt; 0 &amp;&amp; label.html().indexOf(asterisksHtml) === -1) {
            label.append(asterisksHtml);
        }
    });
});
</code></pre>


blocks|key|689332|text|虽然这不需要修改LabelFor，但这是我能想到的最简单的方法，它只需要在ViewModel中使用一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|689333|public+class+FooViewModel
{
+++[Required(ErrorMessage+=+"Name+is+required")]
+++[Display(Name+="Name*")]
+++public+string+Name+{+get;+set;+}
}

Html.LabelFor(o+=>+o.Name)|code-block|syntax|javascript|689334|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Though this doesn't require modifying the LabelFor, it is the simplest I can think of which only requires 1 line in your ViewModel:</p>

<pre><code>public class FooViewModel
{
   [Required(ErrorMessage = "Name is required")]
   [Display(Name ="Name*")]
   public string Name { get; set; }
}

Html.LabelFor(o =&gt; o.Name)
</code></pre>


blocks|key|689392|text|发布一个通用的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|689393|以下是使用Bootstrap的一般格式：|689394|<div+class="form-group+row">
++++<label+class="col-md-3+label-control"+asp-for="FacilityCode"></label>
++++<div+class="col-md-9">
++++++++<input+asp-for="FacilityCode"+class="form-control"+placeholder="@Localizer["Facility+Code"]"+/>
++++++++<span+asp-validation-for="FacilityCode"+class="text-danger"></span>
++++</div>
</div>|code-block|syntax|javascript|689395|以下是默认情况下TagHelper生成的代码：|689396|<div+class="form-group+row">
++<label+class="col-md-3+label-control"+for="FacilityCode">Example+Label+</label>
++<div+class="col-md-9">
+++++++<input+class="form-control"+placeholder="Facility+Code"+type="text"+data-val="true"+data-val-length="The+field+Institution+(Community)+must+be+a+string+with+a+maximum+length+of+5."+data-val-length-max="5"+data-val-required="The+Institution+(Community)+field+is+required."+id="FacilityCode"+maxlength="5"+name="FacilityCode"+value="12345">
+++++++<span+class="text-danger+field-validation-valid"+data-valmsg-for="FacilityCode"+data-valmsg-replace="true"></span>
++</div>
</div>|689397|我需要的是将<span+style="color:red;">*</span>附加到所有必填字段，而不是到处使用TagHelper。|offset|length|style|CODE|689398|//+append+red+star+to+required+fields
$(document).ready(function+()+{
++++$('input[data-val-required]')
++++++++.closest(".form-group")
++++++++.find("label.label-control")
++++++++.append("<span+style='color:red;'>*</span>");
});|689399|entityMap^0|0|0|0|0|0|6|X|1K|9|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@$O|12|P|13|Q|R]|$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

<p>Post a general solution:</p>
<p>Here is a general format to use Bootstrap:</p>
<pre><code>&lt;div class=&quot;form-group row&quot;&gt;
    &lt;label class=&quot;col-md-3 label-control&quot; asp-for=&quot;FacilityCode&quot;&gt;&lt;/label&gt;
    &lt;div class=&quot;col-md-9&quot;&gt;
        &lt;input asp-for=&quot;FacilityCode&quot; class=&quot;form-control&quot; placeholder=&quot;@Localizer[&quot;Facility Code&quot;]&quot; /&gt;
        &lt;span asp-validation-for=&quot;FacilityCode&quot; class=&quot;text-danger&quot;&gt;&lt;/span&gt;
    &lt;/div&gt;
&lt;/div&gt;
</code></pre>
<p>Here is generated code by default TagHelper:</p>
<pre><code>&lt;div class=&quot;form-group row&quot;&gt;
  &lt;label class=&quot;col-md-3 label-control&quot; for=&quot;FacilityCode&quot;&gt;Example Label &lt;/label&gt;
  &lt;div class=&quot;col-md-9&quot;&gt;
       &lt;input class=&quot;form-control&quot; placeholder=&quot;Facility Code&quot; type=&quot;text&quot; data-val=&quot;true&quot; data-val-length=&quot;The field Institution (Community) must be a string with a maximum length of 5.&quot; data-val-length-max=&quot;5&quot; data-val-required=&quot;The Institution (Community) field is required.&quot; id=&quot;FacilityCode&quot; maxlength=&quot;5&quot; name=&quot;FacilityCode&quot; value=&quot;12345&quot;&gt;
       &lt;span class=&quot;text-danger field-validation-valid&quot; data-valmsg-for=&quot;FacilityCode&quot; data-valmsg-replace=&quot;true&quot;&gt;&lt;/span&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>
<p>what I need is to append <code>&lt;span style=&quot;color:red;&quot;&gt;*&lt;/span&gt;</code> to all required fields, instead of using <code>TagHelper</code> everywhere.</p>
<pre><code>// append red star to required fields
$(document).ready(function () {
    $('input[data-val-required]')
        .closest(&quot;.form-group&quot;)
        .find(&quot;label.label-control&quot;)
        .append(&quot;&lt;span style='color:red;'&gt;*&lt;/span&gt;&quot;);
});
</code></pre>


<p>I want to create an extension method for <code>HtmlHelper</code> that allows me to create a <code>LabelFor</code> a property display an asterisk after it if it is a required field. How can I do that?</p>

<pre><code>public class Foo
{
    [Required]
    public string Name { get; set; }
}

Html.LabelFor(o =&gt; o.Name) // Name*
</code></pre>


How can I modify LabelFor to display an asterisk on required fields?

我想为HtmlHelper创建一个扩展方法，它允许我创建一个LabelFor属性，如果它是必填字段，则在它后面显示一个星号。我该怎么做呢？public class Foo{    [Required]    public string Name { get; set; }}Html.LabelFor(o => o.Na...

问如何修改LabelFor以在必填字段上显示星号？
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问如何修改LabelFor以在必填字段上显示星号？
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