使用StreamWriter

Question

未处理的类型＆＃39; System.IO.IOException＆＃39;发生在mscorlib.dll

仅在已创建文件时才有效。当我删除文件并从头开始时，它会出现以下错误

代码：

    private void Btn_Create_Click(object sender, EventArgs e)
    {
        string path = Environment.CurrentDirectory + "/"+ "File.txt";
        if (!File.Exists(path))
        {
            File.CreateText(path);
            MessageBox.Show("File Created Successfully");
        }
        else
        {
            MessageBox.Show("File Already Created");
        }
    }

    private void Btn_Write_Click(object sender, EventArgs e)
    {
        using (StreamWriter sw = new StreamWriter("File.txt"))
        {
            sw.WriteLine("Hello World");
        }     
    }

    private void Btn_Read_Click(object sender, EventArgs e)
    {
        using (StreamReader sr = new StreamReader("File.txt"))
        {
            string text = sr.ReadLine();
            Text_Show.Text = text;
        }
    }

    private void Btn_Delete_Click(object sender, EventArgs e)
    {
        if(File.Exists("File.txt"))
        {
            File.Delete("File.txt");
            MessageBox.Show("File Deleted");
        }
    }
}

}

Answer 1

此处的错误位于Btn_Create_Click内。您正在使用File.CreateText而不处理流。看看here。

只需致电Dispose或将其放入Using。

像这样：

private void Btn_Create_Click(object sender, EventArgs e)
{
    string path = Environment.CurrentDirectory + "/"+ "File.txt";
    if (!File.Exists(path))
    {
        File.CreateText(path).Dispose();
        MessageBox.Show("File Created Successfully");
    }
    else
    {
        MessageBox.Show("File Already Created");
    }
}