验证 Windows Phone 应用程序的独立存储中的应用程序设置键值

发布于 2024-08-25 18:17:45 字数 1394 浏览 5 评论 0原文

我对 C# Windows Phone 编程非常陌生,所以这很可能是一个愚蠢的问题,但我需要知道任何人......

            IsolatedStorageSettings appSettings =
                IsolatedStorageSettings.ApplicationSettings;

        if (!appSettings.Contains("isFirstRun"))
        {
            firstrunCheckBox.Opacity = 0.5;

            MessageBox.Show("isFirstRun not found - creating as true");

            appSettings.Add("isFirstRun", "true");
            appSettings.Save();
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = true;
        }
        else
        {
            if (appSettings["isFirstRun"] == "true")
            {
                firstrunCheckBox.Opacity = 1;
                firstrunCheckBox.IsChecked = true;
            }
            else if (appSettings["isFirstRun"] == "false")
            {
                firstrunCheckBox.Opacity = 1;
                firstrunCheckBox.IsChecked = false;
            }
            else
            {
                firstrunCheckBox.Opacity = 0.5;
            }
        }          

我试图首先检查我的应用程序设置隔离存储中是否有特定的密钥,并且然后希望使复选框显示为选中或未选中,具体取决于该键的值是“true”还是“false”。另外,当不对其采取任何操作时,我将复选框的不透明度默认为 0.5。

使用我拥有的代码,我收到警告

可能是意外的参考比较;要进行值比较,请将左侧转换为“字符串”

有人可以告诉我我做错了什么吗?我已经尝试过将数据存储在独立存储 txt 文件中,这很有效,我现在正在尝试应用程序设置,最后将尝试下载并存储 xml 文件,以及创建用户设置并将其存储到 xml 文件中。我想尝试了解所有向我开放的选项,并使用运行得更好更快的选项

I am very new at all this c# Windows Phone programming, so this is most probably a dumb question, but I need to know anywho...

            IsolatedStorageSettings appSettings =
                IsolatedStorageSettings.ApplicationSettings;

        if (!appSettings.Contains("isFirstRun"))
        {
            firstrunCheckBox.Opacity = 0.5;

            MessageBox.Show("isFirstRun not found - creating as true");

            appSettings.Add("isFirstRun", "true");
            appSettings.Save();
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = true;
        }
        else
        {
            if (appSettings["isFirstRun"] == "true")
            {
                firstrunCheckBox.Opacity = 1;
                firstrunCheckBox.IsChecked = true;
            }
            else if (appSettings["isFirstRun"] == "false")
            {
                firstrunCheckBox.Opacity = 1;
                firstrunCheckBox.IsChecked = false;
            }
            else
            {
                firstrunCheckBox.Opacity = 0.5;
            }
        }          

I am trying to firstly check if there is a specific key in my Application Settings Isolated Storage, and then wish to make a CheckBox appear checked or unchecked depending on if the value for that key is "true" or "false". Also I am defaulting the opacity of the checkbox to 0.5 opacity when no action is taken upon it.

With the code I have, I get the warnings

Possible unintended reference comparison; to get a value comparison, cast the left hand side to type 'string'

Can someone tell me what I am doing wrong. I have explored storing data in an Isolated Storage txt file, and that worked, I am now trying Application Settings, and will finally try to download and store an xml file, as well as create and store user settings into an xml file. I want to try understand all the options open to me, and use which ever runs better and quicker

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丑疤怪 2024-09-01 18:17:45

如果您显式地将 appSettings 中的值检索结果转换为如下字符串:

        if ((string)appSettings["isFirstRun"] == "true")
        {
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = true;
        }
        else if ((string)appSettings["isFirstRun"] == "false")
        {
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = false;
        }
        else
        {
            firstrunCheckBox.Opacity = 0.5;
        }

这将使警告消失。

If you explicitly cast the results of the value retrieval from the appSettings to string like this:

        if ((string)appSettings["isFirstRun"] == "true")
        {
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = true;
        }
        else if ((string)appSettings["isFirstRun"] == "false")
        {
            firstrunCheckBox.Opacity = 1;
            firstrunCheckBox.IsChecked = false;
        }
        else
        {
            firstrunCheckBox.Opacity = 0.5;
        }

and that will make the warnings go away.

锦欢 2024-09-01 18:17:45

isolatedStorageSettings 存储为字典。因此,一般来说,您需要将其显式转换为您需要使用的任何类型。

IsolatedStorageSettings are stored as Dictionary. So in general you would need to cast it explicitly to whatever type you need to use.

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