Implementation Method of Hiding Sensitive Information Such as Phone Number and Email in C#

Intro

When doing a project, there are some sensitive information on the page that needs to be used with "*"I want to hide some important information, so I plan to write a general method.

Let's do it !

Method 1: Specify the number of characters on both sides

Method 1.1 in the middle*The number of characters and the actual length are related

/// <summary>
/// Hide sensitive information
/// </summary>
/// <param name="info">Information entity</param>
/// <param name="left">The number of characters retained on the left</param>
/// <param name="right">The number of characters retained on the right</param>
/// <param name="basedOnLeft">Whether to display the left side when the length is abnormal 
/// <code>true</code>/code>Display on the left, <code>false</code>/code>Display on the right
/// </param>
/// <returns></returns>
public static string HideSensitiveInfo(string info, int left, int right, bool basedOnLeft=true)
{
if (String.IsNullOrEmpty(info))
{
return "";
}
StringBuilder sbText = new StringBuilder();
int hiddenCharCount = info.Length - left - right;
if (hiddenCharCount > 0)
{
string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);
sbText.Append(prefix);
for (int i = 0; i < hiddenCharCount; i++)
{
sbText.Append("*");
}
sbText.Append(suffix);
}
else
{
if (basedOnLeft)
{
if (info.Length > left && left > 0)
{
sbText.Append(info.Substring(0, left) + "****");
}
else
{
sbText.Append(info.Substring(0, 1) + "****");
}
}
else
{
if (info.Length > right && right > 0)
{
sbText.Append("****" + info.Substring(info.Length - right));
}
else
{
sbText.Append("****" + info.Substring(info.Length - 1));
}
}
}
return sbText.ToString();
}

Method 1.2 : The middle*The number of fixed

/// <summary>
/// Hide sensitive information
/// </summary>
/// <param name="info">Information entity</param>
/// <param name="left">The number of characters retained on the left</param>
/// <param name="right">The number of characters retained on the right</param>
/// <param name="basedOnLeft">Whether to display the left side when the length is abnormal 
/// <code>true</code>/code>Display on the left, <code>false</code>/code>Display on the right
/// <returns></returns>
public static string HideSensitiveInfo1(string info, int left, int right, bool basedOnLeft = true)
{
if (String.IsNullOrEmpty(info))
{
return "";
}
StringBuilder sbText = new StringBuilder();
int hiddenCharCount = info.Length - left - right;
if (hiddenCharCount > 0)
{
string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);
sbText.Append(prefix);
sbText.Append("****");
sbText.Append(suffix);
}
else
{
if (basedOnLeft)
{
if (info.Length > left && left >0)
{
sbText.Append(info.Substring(0, left) + "****");
}
else
{
sbText.Append(info.Substring(0, 1) + "****");
}
}
else
{
if (info.Length > right && right>0)
{
sbText.Append("****" + info.Substring(info.Length - right));
}
else
{
sbText.Append("****" + info.Substring(info.Length - 1));
}
}
}
return sbText.ToString();
}

Method 2 : "*"The number is fixed, set to4each, according to the ratio of the total length of the information, the default is to take from both sides1/3

/// <summary>
/// Hide sensitive information
/// </summary>
/// <param name="info">Information</param>
/// <param name="sublen">The ratio of total length of information to left substring (or right substring)</param>
/// <param name="basedOnLeft">Whether to display the left side when the length is abnormal, default true, default display the left side</param>
/// <code>true</code>/code>Display on the left, <code>false</code>/code>Display on the right
/// <returns></returns>
public static string HideSensitiveInfo(string info,int sublen = 3,bool basedOnLeft = true)
{
if (String.IsNullOrEmpty(info))
{
return "";
}
if (sublen <=1)
{
sublen = 3;
}
int subLength = info.Length / sublen;
if (subLength > 0 && info.Length > (subLength*2) )
{
string prefix = info.Substring(0, subLength), suffix = info.Substring(info.Length - subLength);
return prefix + "****" + suffix;
}
else
{
if (basedOnLeft)
{
string prefix = subLength > 0 &&63; info.Substring(0, subLength) : info.Substring(0, 1);
return prefix + "****";
}
else
{
string suffix = subLength > 0 &&63; info.Substring(info.Length-subLength) : info.Substring(info.Length-1);
return "****"+suffix;
}
}
}

Expansion

Phone number 1

/// <summary>
/// Hide phone number details
/// </summary>
/// <param name="phone">Phone number</param>
/// <param name="left">Number of characters retained on the left</param>
/// <param name="right">Number of characters retained on the right</param>
/// <returns></returns>
public static string HideTelDetails(string phone, int left = 3, int right = 4)
{
return HideSensitiveInfo(phone, left, right);
}

The test results are as follows:

Phone number 2

/// <summary>
/// Hide phone number details
/// </summary>
/// <param name="phone">Phone number</param>
/// <param name="left">Number of characters retained on the left</param>
/// <param name="right">Number of characters retained on the right</param>
/// <returns></returns>
public static string HideTelDetails(string phone, int left = 3, int right = 4)
{
return HideSensitiveInfo1(phone, left, right);
}

The test results are as follows:

Email address

/// <summary>
/// Hide right-click details
/// </summary>
/// <param name="email">Email address</param>
/// <param name="left">Number of characters retained in the email header, the default value is set to3</param>
/// <returns></returns>
public static string HideEmailDetails(string email, int left = 3)
{
if (String.IsNullOrEmpty(email))
{
return "";
}
if (System.Text.RegularExpressions.Regex.IsMatch(email, @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))//If it is an email address
{
int suffixLen = email.Length - email.LastIndexOf('@');
return HideSensitiveInfo(email, left, suffixLen, false);
}
else
{
return HideSensitiveInfo(email);
}
}

The test results are as follows:

The above-mentioned methods introduced by the editor to hide sensitive information such as mobile phone numbers and email addresses in C# are for your reference. I hope they will be helpful to you. If you have any questions, please leave me a message, and I will reply to you in time. Thank you very much for your support of the Yell Tutorial website!

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