Add string extension methods IfContains and IfNotContains

Author: I-RzR-I

src/DomainCommonExtensions/DataTypeExtensions/StringExtensions.cs

@@ -1682,5 +1682,33 @@ public static string FormatWith(this string source, params object[] args)
 
             return string.Format(CultureInfo.CurrentCulture, source, args);
         }
+
+        /// <summary>
+        ///     A string extension method that if contains.
+        /// </summary>
+        /// <param name="source">The input.</param>
+        /// <param name="searchValue">The search value.</param>
+        /// <param name="resultValue">Default value to return.</param>
+        /// <returns>
+        ///     A string.
+        /// </returns>
+        public static string IfContains(this string source, string searchValue, string resultValue)
+        {
+            return source.Contains(searchValue).IsTrue() ? resultValue : source;
+        }
+
+        /// <summary>
+        ///     A string extension method that if not contains.
+        /// </summary>
+        /// <param name="source">The input.</param>
+        /// <param name="searchValue">The search value.</param>
+        /// <param name="resultValue">Default value to return.</param>
+        /// <returns>
+        ///     A string.
+        /// </returns>
+        public static string IfNotContains(this string source, string searchValue, string resultValue)
+        {
+            return source.Contains(searchValue).IsFalse() ? resultValue : source;
+        }
     }
 }

src/tests/DataTypeTests/DataTests/StringTests.cs

@@ -557,5 +557,27 @@ public void ArrayToString_Test()
             Assert.IsNotNull(result);
             Assert.AreEqual("ab", result);
         }
+
+        [DataRow("$FFFFFF", "$", "$FFFFFF")]
+        [DataRow("FFFFFF", "$", "FFFFFF")]
+        [TestMethod]
+        public void IfContains_Test(string source, string checkValue, string exceptedResult)
+        {
+            var res = source.IfContains(checkValue, exceptedResult);
+            
+            Assert.IsNotNull(res);
+            Assert.AreEqual(exceptedResult, res);
+        }
+
+        [DataRow("$FFFFFF", "$", "$FFFFFF")]
+        [DataRow("FFFFFF", "$", "$FFFFFF")]
+        [TestMethod]
+        public void IfNotContains_Test(string source, string checkValue, string exceptedResult)
+        {
+            var res = source.IfNotContains(checkValue, exceptedResult);
+            
+            Assert.IsNotNull(res);
+            Assert.AreEqual(exceptedResult, res);
+        }
     }
 }