Question

我尝试使用代码编辑文本文件的一行。我在Windows 7上的visual studio .Net 4.5上使用了c＃。

这是我的代码：

    public static void Updateconfigfile(bool updateall, int linenotoedit)
    {

        if (updateall == true)
        {
            //update all lines of files
            MessageBox.Show("start  1");
        } else
        {
            MessageBox.Show("start");
            noprojecton = 10;

            //update only a specified line
            //line index for file.readalllines beguins at zero
            string updatestring = Updateconfigfilegetvalue(1);

            string[] textfile = File.ReadAllLines(appdataconfigpath);

            MessageBox.Show(textfile[0]);
            textfile[0] = Updateconfigfilegetvalue(0);
            MessageBox.Show(textfile[0]);


            File.WriteAllLines(appdataconfigpath, textfile);
        }


    }

    public static string Updateconfigfilegetvalue(int lineno)
    {
        //determine which line the user wants to update starts at line 0
        //return the correct line
        string toreturn = "";
        switch(lineno)
        {
            case 0:
                toreturn = ("numberofprojectson: " + noprojecton);
                return toreturn;
            default:
                return "";
        }
    }

在文件中，当前的一行文字表示＆＃39; numberofprojectson：1＆＃39; 当我运行它时，我显示了说开始的消息。

然后有一条消息说＆＃39; 1＆＃39;然后一个人说＆＃39; 10＆＃39;

所以它以字符串数组形式获取文本文件并更改数组的0索引，但它不会将其写入文本文件。由于文本文件仍然表示＆＃39; numberofprojectson：1＆＃39;。

我检查了文件路径，并使用断点检查所有代码正在执行，并且它正在执行每一行并写入正确的文件。

任何帮助都将不胜感激。

控制台输出：

'
'Pseudocode Writer.exe' (CLR v4.0.30319: DefaultDomain): Loaded C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: DefaultDomain): Loaded 'E:\Pseudocode Writer\Pseudocode Writer\bin\Debug\Pseudocode Writer.exe'. Symbols loaded.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    'Pseudocode Writer.exe' (CLR v4.0.30319: Pseudocode Writer.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
    Exception thrown: 'System.IO.IOException' in mscorlib.dll
    The program '[4276] Pseudocode Writer.exe' has exited with code 0 (0x0).

应用数据配置路径

  public static String appdatapathprovisonal = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
 appdatapath = (appdatapathprovisonal + asciicharbackslash + "Pseudocode Writer");
appdataconfigpath = (appdatapath + asciicharbackslash + "config.pwc");
 public static string asciicharbackslash = (Convert.ToChar(92)).ToString();

92 ascii代码是＆＃39; \＆＃39; .pwc是一个文本文件（.txt）

在控制台中抛出异常：

Exception thrown: 'System.IO.IOException' in mscorlib.dll

Answer 1

感谢所有帮助。事实证明，当文件已被另一个进程使用时，会发生此异常。在我的情况下，这是因为我忘了关闭流阅读器。因此，如果您遇到此错误，请记住检查文件是否在程序中以其他方式使用。再次感谢！

C＃编辑文本行文件无法正常工作

1 个答案: