C#中英文混合字符串截取函数

代码一

/// <summary>
/// 截断字符串
/// </summary>
/// <param name="maxLength">最大长度</param>
/// <param name="str">原字符串</param>
/// <returns></returns>
public static string CutStr(int maxLength, string str)
{
string temp = str;
if (Regex.Replace(temp, "[\u4e00-\u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= maxLength)
{
return temp;
}
for (int i = temp.Length; i >= 0; i--)
{
temp = temp.Substring(0, i);
if (Regex.Replace(temp, "[\u4e00-\u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= maxLength - 3)
{
return temp + "...";
}
}
return "...";
}

代码二

private string GetByteString(string center, int maxlen, string endStr)
{
string temp = center.Substring(0, (center.Length < maxlen + 1) ? center.Length : maxlen + 1);
byte[] encodedBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(temp);
string outputStr = "";
int count = 0;
for (int i = 0; i < temp.Length; i++)
{
if ((int)encodedBytes[i] == 63)
count += 2;
else
count += 1;

if (count <= maxlen - endStr.Length)
outputStr += temp.Substring(i, 1);
else if (count > maxlen)
break;
}
if (count <= maxlen)
{
outputStr = temp;
endStr = "";
}
outputStr += endStr;
return outputStr;
}

以上就是C# 截取字符串方法（包含中英混合）的实现代码，需要的朋友可以参考一下

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