手机号缩略显示

/// <summary>
/// 手机号缩略显示
/// </summary>
/// <param name="str">手机号</param>
/// <param name="startIndex">从第几位开始隐藏</param>
/// <param name="count">隐藏几位</param>
/// <param name="ArrSize">用几个*代替</param>
/// <returns></returns>
public static string Str_Replace(string str, int startIndex, int count, int ArrSize)
{
try
{
string[] Arr = new string[ArrSize];
for (int i = 0; i < ArrSize; i++)
Arr[i] = "*";
string str2 = str.Remove(startIndex, count);
string str3 = str2.Insert(startIndex, string.Join("", Arr));
return str3;
}
catch {
return str;
}
}

知识点：string.join()：将数组转化成字符串 

https://www.cnblogs.com/multiplesoftware/archive/2011/09/17/2179380.html