C#截取中英文混合字符串分行显示

private int GetStrByteLength(string str)

{

return System.Text.Encoding.Default.GetByteCount(str);

}

private string SubStrLenth(string str, int startIndex, int length)

{

int strlen = GetStrByteLength(str);

if (startIndex + 1 > strlen)

{

return "";

}

int j = 0;//记录遍历的字节数

int L = 0;//记录每次截取开始，遍历到开始的字节位，才开始记字节数

int strW = 0;//字符宽度

bool b = false;//当每次截取时，遍历到开始截取的位置才为true

string restr = string.Empty;

for (int i = 0; i < str.Length; i++)

{

char C = str[i];

if (ISChinese(C))

{

strW = 2;

}

else

{

strW = 1;

}

if ((L == length-1) && (L + strW > length))

{

b = false;

break;

}

if (j >= startIndex)

{

restr += C;

b = true;

}

j += strW;

if (b)

{

L += strW;

if (((L + 1) > length))

{

b = false;

break;

}

}

}

return restr;

}