ten must have C# string manipulations

Well, actually here are nine string manipulations you cannot live without and one you will never need. These tests passed for me:

1. Determine if a string contains another string:
   
   [TestMethod]
   
   public void ShouldFindLiarInBilliards()
   
   {
   
      string billiards = "billiards";
   
      string liar = "liar";
   
      int matchNotation = billiards.IndexOf(liar);
   
      bool isMatch;
   
      if (matchNotation != -1)
   
      {
   
         isMatch = true;
   
      } else {
   
         isMatch = false;
   
      }
   
      Assert.AreEqual(true,isMatch);
   
   }
   
    
   
    
2. Split a string into an array of strings based upon a particular character:
   
   [TestMethod]
   
   public void BilliardsShouldSplitIntoThreePieces()
   
   {
   
      string billiards = "billiards";
   
      string splitChar = "i";
   
      string[] splitPieces = billiards.Split(splitChar.ToCharArray());
   
      Assert.AreEqual(3, splitPieces.Length);
   
      Assert.AreEqual("b", splitPieces[0]);
   
      Assert.AreEqual("ll", splitPieces[1]);
   
      Assert.AreEqual("ards", splitPieces[2]);
   
   }
   
    
   
    
3. Drop the last character on a string:
   
   [TestMethod]
   
   public void MayMakeBilliardsSingular()
   
   {
   
      string billiards = "billiards";
   
      string billiard = billiards.TrimEnd('s');
   
      Assert.AreEqual("billiard",billiard);
   
   }
   
    
   
    
4. Trim the last few characters and/or the first few characters off of a string:
   
   [TestMethod]
   
   public void MayTrimBilliardsToLiarWithSubstring()
   
   {
   
      string billiards = "billiards";
   
      billiards = billiards.Substring(0, 7);
   
      Assert.AreEqual("billiar",billiards);
   
      billiards = billiards.Substring(3, 4);
   
      Assert.AreEqual("liar",billiards);
   
   }
   
    
   
    
5. Use regular expressions for determining if a string is of a particular shape:
   
   [TestMethod]
   
   public void BilliardsIsNotAnEmailAddress()
   
   {
   
      string billiards = "billiards";
   
      bool isMatch;
   
      if (Regex.IsMatch(billiards, @"^\w+([-+.']\w+)*@\w+([-+.']\w+)*\.\w+([-+.']\w+)*$"))
   
      {
   
         isMatch = true;
   
      } else {
   
         isMatch = false;
   
      }
   
      Assert.AreEqual(false, isMatch);
   
   }
   
    
   
    
6. Convert a string to title case:
   
   [TestMethod]
   
   public void MayCastSentenceToTitleCase()
   
   {
   
      string billiards = "Come to Tom's billiards room!";
   
      CultureInfo cultureInfo = Thread.CurrentThread.CurrentCulture;
   
      TextInfo textInfo = cultureInfo.TextInfo;
   
      billiards = textInfo.ToTitleCase(billiards);
   
      Assert.AreEqual("Come To Tom's Billiards Room!", billiards);
   
   }
   
    
   
    
7. Replace a piece of a string with other characters:
   
   [TestMethod]
   
   public void MayReplaceLiarWithTruthTeller()
   
   {
   
      string billiards = "billiards";
   
      billiards = billiards.Replace("liar", "truth-teller");
   
      Assert.AreEqual("biltruth-tellerds", billiards);
   
   }
   
    
   
    
8. Encrypt a string:
   
   [TestMethod]
   
   public void MayEncryptBilliards()
   
   {
   
      string billiards = "billiards";
   
      System.Security.Cryptography.MD5CryptoServiceProvider objCript;
   
      objCript = new System.Security.Cryptography.MD5CryptoServiceProvider();
   
      byte[] bytes = System.Text.Encoding.UTF8.GetBytes(billiards);
   
      bytes = objCript.ComputeHash(bytes);
   
      System.Text.StringBuilder builder = new System.Text.StringBuilder();
   
      foreach (byte bit in bytes)
   
      {
   
         builder.Append(bit.ToString("x2").ToLower());
   
      }
   
      billiards = builder.ToString();
   
      Assert.AreEqual("dcffcb328215e331284aacb75781da68", billiards);
   
   }
   
    
   
    
9. Cast a double and/or a decimal to a string while formatting it as currency:
   
   [TestMethod]
   
   public void MayFormatBilliardsHallDailyRevenueAsCurrency()
   
   {
   
      decimal decimalValue = 1921.39m;
   
      string decimalString = String.Format("Day: {0:C}", decimalValue);
   
      Assert.AreEqual("Day: $1,921.39", decimalString);
   
      double doubleValue = 1921.39;
   
      string doubleString = String.Format("Day: {0:C}", doubleValue);
   
      Assert.AreEqual("Day: $1,921.39", doubleString);
   
      Assert.AreEqual(decimalString,doubleString);
   
   }
   
    
   
    
10. Reverse a string (which you will never need to do):
    
    [TestMethod]
    
    public void MayReverseBilliards()
    
    {
    
       string billiards = "billiards";
    
       char[] characterArray = billiards.ToCharArray();
    
       Array.Reverse(characterArray);
    
       billiards = new string(characterArray);
    
       Assert.AreEqual("sdraillib",billiards);
    
    }
    
     
    
     

For more information on string manipulations, please click the image here: