MVC助手扩展

Question

为什么我用字母串下划线得到错误"Expected class,interface,enum or struct"？

 public static string IsSelected(this HtmlHelper helper, string A, string B)

    {
         return "wtf";

    }

Answer 1

您的扩展方法需要在静态类中:

public static class MyExtensions
{
    public static string IsSelected( this HtmlHelper helper, string A, string B)
    {
        return "wtf";

    }
}