总结的5个C#字符串操作方法分享

/// <summary>
/// 把字符串按照分隔符转换成 List
/// </summary>
/// <param name="str">源字符串</param>
/// <param name="speater">分隔符</param>
/// <param name="toLower">是否转换为小写</param>
/// <returns></returns>
public static List<string> GetStrArray(string str, char speater, bool toLower)
{
var list = new List<string>();
var ss = str.Split(speater);
foreach (var s in ss)
{
if (string.IsNullOrWhiteSpace(s) || s == speater.ToString(CultureInfo.InvariantCulture)) continue;
var strVal = s;
if (toLower)
{
strVal = s.ToLower();
}
list.Add(strVal);
}
return list;
}

/// <summary>
/// 把字符串转 按照, 分割 换为数据
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string[] GetStrArray(string str)
{
return str.Split(new[] { ',', '，' });
}

/// <summary>
/// 得到数组列表以逗号分隔的字符串
/// </summary>
/// <param name="list"></param>
/// <param name="speater"></param>
/// <returns></returns>
public static string GetArrayStr(List<string> list, string speater)
{
var sb = new StringBuilder();
for (var i = 0; i < list.Count; i++)
{
if (i == list.Count - 1)
{
sb.Append(list[i]);
}
else
{
sb.Append(list[i]);
sb.Append(speater);
}
}
return sb.ToString();
}

/// <summary>
/// 得到字符串长度
/// </summary>
/// <param name="inputStr"></param>
/// <returns></returns>
public static int StrLength(string inputStr)
{
var asc = new ASCIIEncoding();
var s = asc.GetBytes(inputStr);
return s.Sum(t => t == 63 ? 2 : 1);
}

/// <summary>
/// 截取指定长度字符串
/// </summary>
/// <param name="inputString"></param>
/// <param name="len"></param>
/// <returns></returns>
public static string CutStr(string inputString, int len)
{
var isShowFix = false;
if (len % 2 == 1)
{
isShowFix = true;
len--;
}
var ascii = new ASCIIEncoding();
var tempLen = 0;
var tempString = "";
var s = ascii.GetBytes(inputString);
for (var i = 0; i < s.Length; i++)
{
tempLen += s[i] == 63 ? 2 : 1;
try
{
tempString += inputString.Substring(i, 1);
}
catch
{
break;
}
 
if (tempLen > len)
break;
}
 
var mybyte = Encoding.Default.GetBytes(inputString);
if (isShowFix && mybyte.Length > len)
tempString += "…";
return tempString;
}