Question

Beloew是我的代码，我想保存一些信息，用户密钥保存到文件中，为什么我在调试后点击保存按钮后仍然遇到Ioexception错误..请点赞adv..thks！！我想这与文件夹有关，但绝对不知道..

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace ASSISNMENTTT
{
    public partial class Registeration : Form
    {
        public Registeration()
        {
            InitializeComponent();
        }

        private void Btn_Save_Click(object sender, EventArgs e)
        {
            // This is the button labeled "Save" in the program.
            //
            File.WriteAllText("C:\\demo.txt", Tb_Admin.Text);
            File.WriteAllText("C:\\demo.txt", Tb_Name.Text);
            File.WriteAllText("C:\\demo.txt", Tb_Gender.Text);
        }
    }
}

Answer 1

您很可能使用的是Win7或Vista，并且无法访问c：\驱动器。

Answer 2

如果您的应用确实可以访问C：\驱动器，则demo.txt可能标记为只读，因为WriteAllText会尝试覆盖该文件。

此代码显示UnauthorizedAccessException，其错误文本与您对问题和其他答案的评论相同。

static void Main(string[] args)
{
    var demoTxt = new FileInfo("C:\\demo.txt");
    demoTxt.Attributes |= FileAttributes.ReadOnly;

    WriteAllText("should succeed");


    try
    {
        demoTxt.Attributes |= FileAttributes.ReadOnly;
        WriteAllText("should fail");
    }
    catch (UnauthorizedAccessException uae)
    {
        Debug.WriteLine(uae.ToString());
    }
}

static void WriteAllText(string text)
{
    // This is the button labeled "Save" in the program.
    //
    File.WriteAllText("C:\\demo.txt", text);
}

为了将来参考，这可以帮助您提供有关SO帖子的更多信息。

    private void Btn_Save_Click(object sender, EventArgs e)
    {
        try
        {
            // This is the button labeled "Save" in the program.
            //
            File.WriteAllText("C:\\demo.txt", Tb_Admin.Text);
            File.WriteAllText("C:\\demo.txt", Tb_Name.Text);
            File.WriteAllText("C:\\demo.txt", Tb_Gender.Text);
        }
        catch(IoException ex)
        {
            //View the Output Window, copy the text to your question
            System.Diagnostics.Debug.WriteLine(ex.ToString());
        }
    }

选择保存按钮时出现IoException错误

2 个答案: