EXCEL未获取到对象的问题
写的一个类

 class wo
    {
        public wo(string Excelpath)
        {
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
            excel.Visible = false;
            Workbook wb = excel.Workbooks._Open(Excelpath,

          Missing.Value, Missing.Value, Missing.Value,

         Missing.Value, Missing.Value, Missing.Value,

            Missing.Value, Missing.Value, Missing.Value,

          Missing.Value, Missing.Value, Missing.Value);
        }


        public void ExcelReplace(string strOldText, string strNewText)
        {


            int icount = wb.Sheets.Count;

            for (int i = 1; i <= icount; i++)
            {

                xSheet = (Worksheet)wb.Sheets[i];

                object what = strOldText; //查找字符串 

                object retxt = strNewText; //替换字符串 

                xSheet.Cells.Replace(what, retxt, Missing.Value,

                    Missing.Value, Missing.Value, Missing.Value,

                    Missing.Value, Missing.Value);

            }
        }
}

下面的是FORM里一个按钮的事件

       private void button1_Click(object sender, EventArgs e)
        {
            wo w = new wo(@"C:\Documents and Settings\Administrator\桌面\Sheet1.xls");
            
            w.ExcelReplace("object1.Tittle", "qq");
        }

总是提示ExcelReplace（）里的wb没有获取对象
[解决办法]
建议直接用构造函数调用 方法 参数放到构造函数里面