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Compiler Warning (level 1) CS1570

XML comment on 'construct' has badly formed XML — 'reason'

When using /doc, any comments in the source code must be in XML. Any error with your XML markup will generate CS1570. For example:

  • If you are passing a string to a cref, such as in an <exception> tag, the string must be enclosed in double quotation marks.
  • If you are using a tag, such as <seealso>, which does not have a closing tag, you must specify a forward slash before the closing angle bracket.
  • If you need to use a greater-than or less-than symbol in the text of description, you need to represent them with &gt; or &lt;.
  • The file or path attribute on an <include> tag was missing or improperly formed.

The following sample generates CS1570:

// CS1570.cs
// compile with: /W:1
namespace ns
{
   // the following line generates CS1570
   /// <summary> returns true if < 5 </summary>
   // try this instead
   // /// <summary> returns true if &lt;5 </summary>

   public class MyClass
   {
      public static void Main ()
      {
      }
   }
}
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