Windows Phone从文本文件中读取

Question

I'm writing an app that reads data from a text file and uses that as the basis of the app. This is just a simple text file with several lines of data that the program needs. I've included the text file as part of the project in visual studio. However, when I try to run the app and read the text file using a StreamReader, it throws an error:

"System.MethodAccessException: Attempt by security transparent method 'App.MainPage..ctor()' to access security critical method 'System.IO.File.Exists(System.String)' failed. at System.IO.File.Exists(String path)"

This text file is very important to the function of the app. Is there any way I can include it with the XAP when people download it and read it directly from within the app?

Answer 1

Here is the solution to read a text file from solution in wp7 app.

1. Copy text file in your solution.

2. Right Click -> Properties

3. Now set Build Action to Resource.

    System.IO.Stream src = Application.GetResourceStream(new Uri("solutionname;component/text file name", UriKind.Relative)).Stream; using (StreamReader sr = new StreamReader(src)) { string text = sr.ReadToEnd(); } 

Answer 2

You can use IsolatedStorageFile class to access your text file within your Windows Phone application. To read it, open a new FileStream . You can then create a StreamReader or a StreamWriter with that FileStream .

The following code accesses IsolatedStorageFile and opens a new StreamReader to read the content.

        using (IsolatedStorageFile f = IsolatedStorageFile.GetUserStoreForApplication())
        {
            //To read
            using (StreamReader r = new StreamReader(f.OpenFile("settings.txt", FileMode.OpenOrCreate)))
            {
                string text = r.ReadToEnd();
            }

            //To write
            using (StreamWriter w = new StreamWriter(f.OpenFile("settings.txt", FileMode.Create)))
            {
                w.Write("Hello World");
            }
        }