I have a text file in my solution called "txtWords.txt", which I attempt to read with:
string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string filePath = Path.Combine(path, "txtWords.txt");
In my experimenting, I've got the same file under both my C# App and the App.Android > Assets folder (set to AndroidAsset). I thought to put it in both locations to be safe.
System.IO.FileNotFoundException: Could not find file "/data/user/0/com.WSC/files/txtWords.txt"
I've read about using AssetManager but that gives me a "namespace could not be found error".
What am I doing wrong and what's the best way to read a text file for an app? This should be really easy so I'm doing something fairly basic wrong, I suppose.
Using Xamarin Essentials you can read a bundled/asset read-only file via your NetStd (Xamarin.Forms) library:
string wordsText;
using (var stream = await FileSystem.OpenAppPackageFileAsync("txtWords.txt"))
using (var reader = new StreamReader(stream))
{
var wordsText = await reader.ReadToEndAsync();
}
re: https://learn.microsoft.com/en-us/xamarin/essentials/file-system-helpers?tabs=android
Nuget: https://www.nuget.org/packages/Xamarin.Essentials
Related
I'm making an app that I want to export to both Windows and Android. In this piece of code, I'm trying to read from a .csv file:
using (StreamReader csv = new StreamReader("MOCK_EMPLOYEE_DATA.csv"))
However, It keeps giving me an error that the file was not found and the path was incorrect. What is the best way to go about this?
The file is in my project folder.
You could do that by following these steps:
1.Drag or add the csv file to the Project.
2.Set the Build Action of csv file to MauiAsset.
3.use the following code to read the file:
using var stream = await FileSystem.OpenAppPackageFileAsync("File.csv");
using var reader = new StreamReader(stream);
var contents = reader.ReadToEnd();
Console.WriteLine(contents);
Hope it works for you.
I have a .txt file in a Resources folder that I created in the Xamarin.Forms project for the app (not the Android or iOS versions), and I want to know how to access that file as soon as the app loads. I tried just creating a StreamReader with the path "Resources/tips.txt" ("tips" is the name of the file), but that doesn't work because apparently, the current directory at that point is nothing. How do I get the directory of the app itself so I can access that folder?
Resources aren't files, you don't use file paths to access them
// MyClass is a class in the same assembly as your resource
var assembly = IntrospectionExtensions.GetTypeInfo(typeof(MyClass)).Assembly;
// see linked docs for notes about resource naming
Stream stream = assembly.GetManifestResourceStream("MyResourceName");
string text = "";
using (var reader = new System.IO.StreamReader (stream))
{
text = reader.ReadToEnd ();
}
I'm trying to read the contents of a file in a Visual Studio extension. The following code works, but forces me to open the file, if it isn't (otherwise it crashes):
textDocument = (TextDocument)projectItem.Document.Object("TextDocument");
EditPoint editPoint = textDocument.StartPoint.CreateEditPoint();
string text = editPoint.GetText(textDocument.EndPoint);
I can get the path of the project, so I suppose I could make an educated guess as to the location of the project item. However, ideally I'd like to either get the file contents without opening it; or, alternatively, get the path to the project item (then I could just use System.IO to access the file contents).
I've looked, but don't seem to be able to find any mention of either of these. Can anyone point me in the right direction, please?
You can get the path from a ProjectItem by reading its properties.
var path = YourProjectItem.Properties.Item("FullPath").Value.ToString()
After you have the path you can read its content with System.IO.
string content = File.ReadAllText(path);
If the file is somewhat larger and you are getting troubles with the current code due to size, you should take a look at the StreamReader class.
I'm not sure if this is possible for extensions but you could probably use System.IO, like this:
using System.IO;
string filePath = #"C:\Whatever\YourFileName.txt";
string fileText = File.ReadAllText(filePath);
You could also use StreamReader like this:
using System.IO;
string filePath = #"C:\Whatever\YourFileName.txt";
using (StreamReader sr = new StreamReader(filePath))
fileText = sr.ReadToEnd();
EDIT:
I think I understand you better now.
The only way to "get the file contents without opening it" would be if the extension were to give you that data actively, but I can safely assume it doesn't.
When reading a file, you should already know where the file is (if you don't know then either you're not intended to access that file or you just haven't looked long enough).
I'd try searching the SDK files manually (Or with a file crawler).
I'm using Visual Studio with Xamarin and wish to store a json file inside of my resources folder.
I need to get the path, deserialize it, then load the data asynchronously. I've looked around, but can't find any useful examples. Is this possible?
Put the file under the "Assets" folder and use the following code to access it:
// to read from assets folder
string content;
AssetManager assets = this.Assets;
using (StreamReader sr = new StreamReader (assets.Open ("file.json")))
{
content = sr.ReadToEnd ();
}
// JSON is now in "content"
Afterwards you can pass the string to a JSON parser. You can find more information on this topic in the Xamarin documentation (=> Reading assets).
I'm trying to read a .txt file in my program:
using (StreamReader sr = new StreamReader(VirtualPathUtility.ToAbsolute("~/Content/txt/FamilyNames.txt")))
{
String line = sr.ReadToEnd();
Debug.WriteLine(line);
}
This however gives me following path, which is incorrect:
C:\Content\txt\FamilyNames.txt
When I search for this I come up with numerous solutions like:
Server.MapPath();
But this seems to be outdated code? Because it doesn't get recognized in my Visual Studio, can't import it...
So what is the correct solution to get a path to a file in the content folder?
Server.MapPath needs a HTTPContext. Use System.Web.Hosting.HostingEnvironment.MapPath instead.
using (StreamReader sr = new StreamReader(HostingEnvironment.MapPath("~/Content/txt/FamilyNames.txt")))
Have you tried :
StreamReader(VirtualPathUtility.ToAppRelative("~/Content/txt/FamilyNames.txt")))