C# - String Utility Methods

While debugging the application (on a serious note) or doing code review sometimes if there is a string not-null or not-empty validation check it's obvious we may ignore those negate conditions (!).

While debugging an application or doing code review, sometimes if there is a string not-null or not-empty validation check, then it's obvious that we may ignore those negate conditions (!).

 

For example,

if (!string.IsNullOrWhiteSpace(inputString))
{
   // do someting here
}

To ignore these we generally adopt a rule to check  with negate condition using the (== false) command.

 

For example,

if (string.IsNullOrWhiteSpace(inputString) == false)
{
    // do someting here
}

It's better to use StringUtility methods with all the possible string validation checks in one place, and use them in multiple projects as-is.

 

Some of the frequently used utility methods:

public static bool AreTrimEqual(string input1, string input2)
{
    return string.Equals(input1?.Trim(), input2?.Trim(), StringComparison.InvariantCultureIgnoreCase);
}

 public static string ToTitleCase(string title)
{
    var cultureInfo = Thread.CurrentThread.CurrentCulture;
    var textInfo = cultureInfo.TextInfo;
    return textInfo.ToTitleCase(title);
}
//Returns an array converted into a string
public static string ArrayToString(Array input, string separator)
{
    var ret = new StringBuilder();
    for (var i = 0; i < input.Length; i++)
    {
        ret.Append(input.GetValue(i));
        if (i != input.Length - 1)
            ret.Append(separator);
    }
    return ret.ToString();
}

//Capitalizes a word or sentence
//word -> Word
//OR
//this is a sentence -> This is a sentence
public static string Capitalize(string input)
{
    if (input.Length == 0) return string.Empty;
    if (input.Length == 1) return input.ToUpper();

    return input.Substring(0, 1).ToUpper() + input.Substring(1);
}

//Checks whether a word or sentence is capitalized
//Word -> True
//OR
//This is a sentence -> True
public static bool IsCapitalized(string input)
{
    if (input.Length == 0) return false;
    return string.CompareOrdinal(input.Substring(0, 1), input.Substring(0, 1).ToUpper()) == 0;
}

//Checks whether a string is in all lower case
//word -> True
//Word -> False
public static bool IsLowerCase(string input)
{
    for (var i = 0; i < input.Length; i++)
    {
        if (string.CompareOrdinal(input.Substring(i, 1), input.Substring(i, 1).ToLower()) != 0)
            return false;
    }
    return true;
}

An exhaustive list can be found here.