如何从helper方法返回字符串而不是html编码

Question

I'm using a C# helper method to check to see if the value of an input field should be prefilled or not. When the value gets returned, however, any special characters have been replaced with html (ie: & is now & ). I'm looking for a way to change this back to the special characters (ie: change ab&c back to ab&c ). I've tried HtmlDecode but it doesn't have any effect on the returned value.

The input field:

<input type="text" class=" form-textbox" id="input_4" name="q4_1Property" size="40" value="@Helpers.checkEmptyPreFill(queryinputvalue,"q4_1Property","ab&c")"/>

The helper method:

@helper checkEmptyPreFill(IEnumerable<dynamic> queryinputvalue, string field_id, string defaultval, int cloned = 0) {  

var reqValue = queryinputvalue.FirstOrDefault(r => r.field_name.Equals(field_id));
var return_value = "";

if(reqValue != null){
    return_value = reqValue.field_data;
} else {

    return_value = defaultval;

}

if(cloned == 1){
    return_value = "";
}

@return_value
}

Answer 1

instead of @return_value

Try

new MvcHtmlString(return_value)

MvcHtmlString Represents an HTML-encoded string that should not be encoded again.

Look at msdn documentation for more details on MvcHtmlString()