[c#] CPD suppression with comments doesn't work #2551

CPD Suppressions for c# fixed
test added

pmd-cs/src/test/java/net/sourceforge/pmd/cpd/CsTokenizerTest.java

@@ -78,6 +78,18 @@ public class CsTokenizerTest {
         assertEquals(5, tokens.size());
     }
 
+    @Test
+    public void testIgnoreBetweenSpecialComments() {
+        tokenizer
+                .tokenize(
+                        toSourceCode("// CPD-OFF\n" + "class Foo {\n" + "  void bar() {\n" + "    int a = 1 >> 2; \n"
+                                + "    a += 1; \n" + "    a++; \n" + "    a /= 3e2; \n" + "    float f = -3.1; \n"
+                                + "    f *= 2; \n" + "    bool b = ! (f == 2.0 || f >= 1.0 && f <= 2.0) \n"
+                                + "  }\n" + "// CPD-ON\n" + "}"),
+                        tokens);
+        assertEquals(2, tokens.size()); // "}" + EOF
+    }
+
     @Test
     public void testCommentsIgnored3() {
         tokenizer.tokenize(toSourceCode("class Foo { /// class X /* aaa */ \n }"), tokens);