Csharp programming note

C# exception knowledge

1.使用FileStream读取文件字符时，读取到末尾发生System.OverflowException异常，提示“确保不会除零,值对于字符太大或太小”，代码如下

    static void Main(string[] args)
        {
            char chLine;
            FileStream aFile = new FileStream(@"C:\Users\betasyone\Desktop\testdata\regiontest.txt", FileMode.Open);
            System.IO.StreamReader file = new StreamReader(aFile);
            char[] charArray = new char[] { ' ' };
            FileStream bFile = new FileStream(@"C:\Users\betasyone\Desktop\testdata\modify.txt", FileMode.CreateNew);                       
            StreamWriter bFileWriter = new StreamWriter(bFile);
            chLine=Convert.ToChar( file.Read());
            int i = 0;
            while (true)
            {
                while (!Convert.ToString(chLine).Equals("\r\n"))
                {
                    if (chLine == ' ')
                        bFileWriter.Write("\r\n");
                    else
                        bFileWriter.Write(chLine);
                    chLine = Convert.ToChar(file.Read());
                    i++;   
                }
            }

在程序运行到文档末尾时抛出异常。这里需要一个表示文末字符的条件语句作为判定。