How to use a relative path in XDocument.Load with Xamarin? - xamarin

Question

I always get the system not found exception. How can I find a xml file in a bundle of my xamarin.android application?
public Dictionary<string, string> TilePropertiesForTileID(short tileGid)
{
Dictionary<string, string> propertiesDict = null;
try
{
// Loading from a file, you can also load from a stream
var xml = XDocument.Load(Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData), "Assets/Content/tileMap/wood_tileset.tsx"));
// Query the data and write out a subset of contacts
var propertiesQuery = from c in xml.Root.Descendants("tile")
where (int)c.Attribute("id") == tileGid
select c.Element("property").Value;
foreach (string property in propertiesQuery)
{
Console.WriteLine("Property: {0}", property);
}
}
catch (Exception e)
{
Console.WriteLine(e);
throw e;
}
return propertiesDict;
}
This line:
var xml = XDocument.Load(Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData), "Assets/Content/tileMap/wood_tileset.tsx"));
always throws the exception. I don't know How to get access to this file.
updated: Thanks to apineda I am now able to find the file : here is the xml file
<?xml version="1.0" encoding="UTF-8"?>
<tileset version="1.2" tiledversion="1.2.1" name="wood_tileset"
tilewidth="32" tileheight="32" tilecount="256" columns="16">
<image source="wood_tileset.png" width="512" height="512"/>
<tile id="68">
<properties>
<property name="IsTreasure" value="true"/>
</properties>
</tile>
</tileset>

Answer 1

For this you don't necessarily need the Full Path of the File. Since you placed the file in the Assets directory and I hope also marked it as AndroidAsset in the Build Action all you need is to make use of the AssetManager.
If you are within an Activity you can open a file in the Assets like this:
Assets.Open("fileName.ext")
If you added subdirectories in the Assets directory you will need to include the full path (without including the word "Assets").
Using your code as sample, it should look like this:
using (var sReader = new StreamReader(Assets.Open("Content/titleMap/wood_tileset.tsx")))
{
var xmlDoc = XDocument.Load(sReader);
// Query the data and write out a subset of contacts
var propertiesQuery = xmlDoc.Root.Descendants("tile")
.Where(item => (int)item.Attribute("id") == tileGid)
.SelectMany(a => a.Descendants("property"))
.Select(property => new
{
Name = property.Attribute("name").Value,
Value = property.Attribute("value").Value
})
.ToList();
foreach (var property in propertiesQuery)
{
Console.WriteLine($"Property Name: {property.Name}, Value: {property.Value}");
}
}
As you can see the return of the Assets.Open method is passed into a StreamReader. The using is not necessary but this will prevent leaving resources opened.
The StreamReader is then passed in to the Load() method of the XDocument and the rest is exactly as you had it.
Note: This assume you have a file structure like the following:
Assets
Content
titleMap
wood_titleset.tsx
Hope this helps.-