C# 字符串截取（包括汉字）

来源：互联网发布：sql 拆分字符串编辑：程序博客网时间：2024/05/16 04:42

private void GetSubString()
{

            //截取的长度
            int count = 0;
            if (!string.IsNullOrEmpty(txtCount.Text))
            {
                count = Convert.ToInt32(txtCount.Text);
            }

if (count >= 2)
{

//将截取的内容转化为byte
byte[] content = System.Text.Encoding.Default.GetBytes(txtContent.Text);

//将截取后的内容放到临时数组中

byte[] temp = new byte[] { content[count - 1] };

//将截取后的内容转化为字符串

string strTemp = System.Text.Encoding.Default.GetString(temp);

                //判断字符串截取是否正确
                if (!txtContent.Text.Contains(strTemp))
                {
                    temp = new byte[] { content[count - 2], content[count - 1] };
                    strTemp = System.Text.Encoding.Default.GetString(temp);
                    if (!txtContent.Text.Contains(strTemp))
                    {
                        count++;
                    }
                }

                byte[] showContent = new byte[count];
                for (int i = 0; i < count; i++)
                {
                    showContent[i] = content[i];
                }

                lblShow.Text = System.Text.Encoding.Default.GetString(showContent);
                lblCount.Text = count.ToString();
            }
            else
            {
                lblShow.Text = txtContent.Text.Substring(0, count);
                lblCount.Text = count.ToString();
            }
        }