小编use*_*052的帖子

嗨伙计们,我想在特殊字符后修剪一个字符串..

让我们说字符串是str="arjunmenon.uking" 我想要获得后面的字符.而忽略其余的字符.IE结果字符串必须是restr="uking"

我想将数据写入现有的Excel文件。 该文件有sheet1，我想在sheet2上写，然后保存。问题是，每次保存时，它将创建一个新的excel文件并覆盖现有文件。保存时保留旧数据的任何帮助。

我有以下功能

using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel; 

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Excel.Application xlApp ;
            Excel.Workbook xlWorkBook ;
            Excel.Worksheet xlWorkSheet ;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Open("csharp.net-informations.xls", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            MessageBox.Show(xlWorkSheet.get_Range("A1","A1").Value2.ToString());

            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
        }

        private void …