ASP.NET MVC - Using Model in Custom HTML Helper [duplicate] - asp.net-mvc

Question

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Refactor similar CHTML that renders varying properties using EditorFor and LabelFor
(2 answers)
Closed 6 years ago.
I am building an app with ASP.NET MVC and Bootstrap. In my app, I have a view with a Model that looks like this:
public class EntryModel
{
[Required(ErrorMessage="Please enter the name.")]
[Display(Name="Name")]
public string Name { get; set; }
[Required (ErrorMessage="Please enter the description.")]
[Display(Name = "Description")]
public string Description { get; set; }
}
In this app, I've also defined a custom html helper that looks like this:
public static class MyHelpers
{
public static MvcHtmlString MyTextBox(this HtmlHelper helper)
{
var sb = new StringBuilder();
sb.Append("<div class=\"form-group\">");
sb.Append("<label class=\"control-label\" for=\"[controlId]\">[labelValue]</label>");
sb.Append("<input class=\"form-control\" id=\"[controlId]\" name=\"controlId\" type=\"text\" value=\"[propertyValue]\">");
sb.Append("</div>");
return MvcHtmlString.Create(sb.ToString());
}
}
I'm using this helper and model in my Razor view, like this:
#model EntryModel
<h2>Hello</h2>
#using (Html.BeginForm("Add", "Entry", new {}, FormMethod.Post, new { role="form" }))
{
#Html.MyTextBox()
}
I am trying to generate the labelValue, controlId, and propertyValue values in the helper from the properties of the Model. For example, I'd like to use #Html.MyTextBoxFor(m => m.Name) and have the helper generate something like this:
<div class="form-group">
<label class="control-label" for="Name">Name</label>");
<input class="form-control" id="Name" name="Name" type="text" value="Jon">
</div>
Essentially, I'm not sure how to get my model information into my html helper.

Answer 1

Use this example as reference:
public static MvcHtmlString AutoSizedTextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression)
{
var attributes = new Dictionary<string, Object>();
var memberAccessExpression = (MemberExpression)expression.Body;
var stringLengthAttribs = memberAccessExpression.Member.GetCustomAttributes(
typeof(System.ComponentModel.DataAnnotations.StringLengthAttribute), true);
if (stringLengthAttribs.Length > 0)
{
var length = ((StringLengthAttribute)stringLengthAttribs[0]).MaximumLength;
if (length > 0)
{
attributes.Add("size", length);
attributes.Add("maxlength", length);
}
}
return helper.TextBoxFor(expression, attributes);
}
And you can call it in the view like this:
#Html.AutoSizedTextBoxFor(x => x.Address2)