C# 读取txt文件

       1.读取txt文件代码：

       ///<summary>
        ///读取txt文件
        ///</summary>
        public void ReadTextContent()
        {
            string Path = @"E:\PDF\123.txt";
            string strTxt = "";
            StreamReader sr = new StreamReader(Path, Encoding.Default);
            string content;
            while ((content = sr.ReadLine()) != null)
            {
                strTxt += content.ToString();
            }

            int i1 = strTxt.IndexOf("<RetPDFStr>") + 11;
            int i2 = strTxt.IndexOf("</RetPDFStr>");
            int i3 = i2 - i1;

            strTxt = strTxt.Substring(i1, i3);
        }