C#隐藏手机号、邮箱等敏感信息的实现方法

Intro

做项目的时候，页面上有一些敏感信息，需要用“*”隐藏一些比较重要的信息，于是打算写一个通用的方法。

Let's do it !

Method 1:指定左右字符数量

Method 1.1 中间的*的个数和实际长度有关

/// <summary>
/// 隐藏敏感信息
/// </summary>
/// <param name="info">信息实体</param>
/// <param name="left">左边保留的字符数</param>
/// <param name="right">右边保留的字符数</param>
/// <param name="basedOnLeft">当长度异常时，是否显示左边 
/// <code>true</code>显示左边，<code>false</code>显示右边
/// </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();
}

/// <summary>
/// 隐藏敏感信息
/// </summary>
/// <param name="info">信息实体</param>
/// <param name="left">左边保留的字符数</param>
/// <param name="right">右边保留的字符数</param>
/// <param name="basedOnLeft">当长度异常时，是否显示左边 
/// <code>true</code>显示左边，<code>false</code>显示右边
/// <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();
}								 
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