/// <summary>
/// Mask the source string with the default mask char.
/// </summary>
/// <param name="sourceValue">Original string to mask.</param>
/// <param name="style">The masking style to use (all characters or just alpha-nums).</param>
/// <returns>The masked account number.</returns>
public static string Mask(this string sourceValue, MaskStyle style)
{
return(Mask(sourceValue, DefaultMaskCharacter, 0, style));
}
/// <summary>
/// Mask the source string with the mask char.
/// </summary>
/// <param name="sourceValue">Original string to mask.</param>
/// <param name="maskChar">The character to use to mask the source.</param>
/// <param name="style">The masking style to use (all characters or just alpha-nums).</param>
/// <returns>The masked account number.</returns>
public static string Mask(this string sourceValue, char maskChar, MaskStyle style)
{
return(Mask(sourceValue, maskChar, 0, style));
}
/// <summary>
/// Mask the source string with the default mask char except for the last exposed digits.
/// </summary>
/// <param name="sourceValue">Original string to mask.</param>
/// <param name="numExposed">Number of characters exposed in masked value.</param>
/// <param name="style">The masking style to use (all characters or just alpha-nums).</param>
/// <returns>The masked account number.</returns>
public static string Mask(this string sourceValue, int numExposed, MaskStyle style)
{
return(Mask(sourceValue, DefaultMaskCharacter, numExposed, style));
}
/// <summary>
/// Mask the source string with the mask char except for the last exposed digits.
/// </summary>
/// <param name="sourceValue">Original string to mask.</param>
/// <param name="maskChar">The character to use to mask the source.</param>
/// <param name="numExposed">Number of characters exposed in masked value.</param>
/// <param name="style">The masking style to use (all characters or just alpha-nums).</param>
/// <returns>The masked account number.</returns>
public static string Mask(this string sourceValue, char maskChar, int numExposed, MaskStyle style)
{
var maskedString = sourceValue;
if (sourceValue.IsLengthAtLeast(numExposed))
{
var builder = new StringBuilder(sourceValue.Length);
int index = maskedString.Length - numExposed;
if (style == MaskStyle.AlphaNumericOnly)
{
CreateAlphaNumMask(builder, sourceValue, maskChar, index);
}
else
{
builder.Append(maskChar, index);
}
builder.Append(sourceValue.Substring(index));
maskedString = builder.ToString();
}
return(maskedString);
}