[UWP] [C＃]无法使用visual c＃universal app保存到文本文件 [英] [UWP][C#]Can't save to text file with visual c# universal app

问题描述

我无法保存对文本文件settings.txt的任何更改，但读取文件有效。

I can't save any changes to the text file settings.txt , but reading the file works.

代码

   private async void LedShow_Loaded（object sender，RoutedEventArgs e）

            {

                var path = @" settings.txt";

                 var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;

                 var file = await folder.GetFileAsync（path）;

                 var lines = await Windows.Storage.FileIO.ReadLinesAsync（file）;

                 sliderDelay.Value = Convert.ToInt32（lines [0]）;

            ;      textBlockDelayValue.Text = lines [0] +"秒数;;

                 buttonSave.IsEnabled = false;

        }

  private async void LedShow_Loaded(object sender, RoutedEventArgs e)
            {
                var path = @"settings.txt";
                var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
                var file = await folder.GetFileAsync(path);
                var lines = await Windows.Storage.FileIO.ReadLinesAsync(file);
                sliderDelay.Value = Convert.ToInt32(lines[0]);
                 textBlockDelayValue.Text = lines[0] + " seconds";
                 buttonSave.IsEnabled = false;
        }

并且错误消息是

发生了'System.UnauthorizedAccessException'类型的异常在System.Private.CoreLib.dll中但未在用户代码中处理

访问被拒绝。 （Excep_FromHResult 0x80070005）发生了

An exception of type 'System.UnauthorizedAccessException' occurred in System.Private.CoreLib.dll but was not handled in user code
Access is denied. (Excep_FromHResult 0x80070005) occurred

有人可以帮助我吗？

推荐答案

嗨！

该应用程序的安装目录是一个只读位置。 

这是Msdn的链接：  https://msdn.microsoft.com/en-us/windows/uwp/files/file-access-permissions

希望它有用：）

这篇关于[UWP] [C＃]无法使用visual c＃universal app保存到文本文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！