作者在 2010-12-12 09:43:23 发布以下内容
//字符是否为汉字
public bool IsChinese(char c)
public bool IsChinese(char c)
{
return (int)c >= 0x4E00 && (int)c <= 0x9FA5;
}
//获得字节长度
private int getLengthb(string str)
{
return System.Text.Encoding.Default.GetByteCount(str);
}
//c#的中英文混合字符串截取指定长度,startidx从0开始 by
public string getStrLenB(string str, int startidx, int len)
{
int Lengthb = getLengthb(str);
if (startidx + 1 > Lengthb)
{
return "";
}
int j = 0;
int l = 0;
int strw = 0;//字符的宽度
bool b = false;
string rstr = "";
for (int i = 0; i < str.Length; i++)
{
char c = str[i];
if (j >= startidx)
{
rstr = rstr + c;
b = true;
}
if (IsChinese(c))
{
strw = 2;
}
else
{
strw = 1;
}
j = j + strw;
if (b)
{
l = l + strw;
if ((l+1)>= len) break;
}
}
return rstr;
}
private void button4_Click(object sender, EventArgs e) //测试by yl
{
MessageBox.Show(getStrLenB("gisoracle欢迎你gisoracle", 0, 10));//gisoracle
MessageBox.Show(getStrLenB("gisoracle欢迎你gisoracle", 1, 10));//isoracle欢
MessageBox.Show(getStrLenB("gisoracle欢迎你gisoracle", 2, 10));//isoracle欢
}