What is the easiest way to get the property value from a passed lambda expression in an extension me
- by Andrew Siemer
I am writing a dirty little extension method for HtmlHelper so that I can say something like HtmlHelper.WysiwygFor(lambda) and display the CKEditor.
I have this working currently but it seems a bit more cumbersome than I would prefer. I am hoping that there is a more straight forward way of doing this.
Here is what I have so far.
public static MvcHtmlString WysiwygFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression)
{
return MvcHtmlString.Create(string.Concat("<textarea class=\"ckeditor\" cols=\"80\" id=\"",
expression.MemberName(), "\" name=\"editor1\" rows=\"10\">",
GetValue(helper, expression),
"</textarea>"));
}
private static string GetValue<TModel, TProperty>(HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression)
{
MemberExpression body = (MemberExpression)expression.Body;
string propertyName = body.Member.Name;
TModel model = helper.ViewData.Model;
string value = typeof(TModel).GetProperty(propertyName).GetValue(model, null).ToString();
return value;
}
private static string MemberName<T, V>(this Expression<Func<T, V>> expression)
{
var memberExpression = expression.Body as MemberExpression;
if (memberExpression == null)
throw new InvalidOperationException("Expression must be a member expression");
return memberExpression.Member.Name;
}
Thanks!
