如何在第一个字符后屏蔽字符串

Question

Let's say I have a string that consists of a person's name:

var name = "Jason, Bruno Mars";

How do I mask the string with X for the name behind the comma and returns:

var name = "Jason, BXXXX MXXX";

I have tried using the following methods but only front characters are masked:

string first, second, output;
bool hasSpace, hasComma;
int int_LENGTH;
var name = "Jason, Bruno Mars";
hasComma = name.Contains(",");

if (hasComma == true)
{
    int_LENGTH = name.IndexOf(",");
    if (int_LENGTH > 0)
    {
        first = name.Substring(0, int_LENGTH);
    }

    second = string.Join(",", name.Split(" ").Skip(1));
    hasSpace = second.Contains(" ");

    if (hasSpace == true)
    {
        second = string.Concat(new string('X', 12), second.Substring(second.Length - 4));
        output = first + "," + second;
    }
}

Anyone has a better idea of how can I achieve the same result in a more efficient way?

Answer 1

Another option, using Regex.Matches to select the name parts except the first letter. The regex collects all string parts separated by a space, skipping what's before the comma.
The collections of Matches is then passed to Linq's Aggregate() method to perform the substitution.
A StringBuilder is used to store the strings generated by its own Replace() method:

string theName = "Jason Et Alt., Bruno Mars And More Names";
var matches = Regex.Matches(theName, @"(?!.*?,)\s+?.(\w+)");

string outName = matches.OfType<Match>().Aggregate(new StringBuilder(theName), (sb, m) => 
   sb.Replace(m.Groups[1].Value, new string('X', m.Groups[1].Length))).ToString();

outname = Jason Et Alt., BXXXX MXXX AXX MXXX NXXXX

Answer 2

static string MaskName(string name)
    {
        string maskedString = string.Empty;

        string[] names = name.Split(',');
        if (names.Length > 0)
        {
            maskedString = names[0] + ",";
        }
        if (names.Length > 1)
        {
            string[] arrName = names[1].Split(' ');
            foreach (string s in arrName)
            {
                if (s.Length > 0)
                    maskedString += " " + s[0].ToString().PadRight(s.Length, 'X');
            }
        }
        return maskedString;
    }

Answer 3

Using This code..

    static string MaskName(string name)
    {
        string maskedString = string.Empty;

        string[] names = name.Split(',');
        if (names.Length > 0)
        {
            maskedString = names[0] + ",";
        }
        if (names.Length > 1)
        {
            string[] arrName = names[1].Split(' ');
            foreach (string s in arrName)
            {
                if (s.Length > 0)
                    maskedString += " " + s[0].ToString().PadRight(s.Length, 'X');
            }
        }
        return maskedString;
    }

Output :-

Answer 4

Try This

 private string ReturnMaskedName(string name)
        {
            string temporary = "";
            var newname = (name.Split(new string[] { "," }, StringSplitOptions.None)[1].Trim().Split(new String[] { " " }, StringSplitOptions.None));

            foreach (string allnames in newname)
            {
                temporary = temporary + " " + allnames[0].ToString() + new string('X', allnames.Length - 1);
            }
            return name.Split(new string[] { " " }, StringSplitOptions.None)[0] + " " + temporary;
        }

Answer 5

Efficient way of masking without Split , Regex , and using System.Linq :

For C# version < 7.2:

static string MaskName(string name)
{
    int indexOfComma = name.IndexOf(',');

    if (indexOfComma != -1)
    {
        char[] temp = name.ToCharArray();

        bool isFirstChar = true;

        for (int i = indexOfComma + 1; i < temp.Length; i++)
        {
            if (temp[i] == ' ')
                isFirstChar = true;
            else if (isFirstChar)
                isFirstChar = false;
            else
                temp[i] = 'X';
        }

        return new string(temp);
    }
    else
    {
        return name;
    }
}

For C# version >= 7.2:

static string MaskName(ReadOnlySpan<char> name)
{
    int indexOfComma = name.IndexOf(',');

    if (indexOfComma != -1)
    {
        Span<char> temp = stackalloc char[name.Length];

        name.CopyTo(temp);

        bool isFirstChar = true;

        for (int i = indexOfComma + 1; i < temp.Length; i++)
        {
            if (temp[i] == ' ')
                isFirstChar = true;
            else if (isFirstChar)
                isFirstChar = false;
            else
                temp[i] = 'X';
        }

        return new string(temp);
    }
    else
    {
        return name.ToString();
    }
}

Answer 6

private string MaskName(string name)
{
    var parts = name.Split(',');
    var subparts = parts[1].Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries);

    for (var i = 0; i < subparts.Length; i++)
    {
        var subpart = subparts[i];

        subparts[i] = subpart[0] + new string('X', subpart.Length - 1);
    }

    return parts[0] + ", " + string.Join(" ", subparts);
}