System.DllNotFoundException: libzstd

[owenStarry]

When I used zstdnet in web applications, it throwed System.DllNotFoundException: libzstd. I review ed the loading native DLL's source code(ExternMethods class) , found a bug that set directory dll error in SetWinDllDirectory method,as follows:
var location = Assembly.GetExecutingAssembly().Location;
In web application, it will get temporary asp.net files directory, not the native dll directory.
I suggest the code modify following:
using System.Web;
var isWebApplication = false;
if(HttpContext.Current!=null){
isWebApplication = true;
}
var location = string.empty;
if(isWebApplication){
//get web application bin direcotry
location = $"{System.AppDomain.CurrentDomain.BaseDirectory}bin/";
}else{
location = Assembly.GetExecutingAssembly().Location;
}

[owenStarry]

I found a better way to solve this problem,as following:
var location = GetBinPath();
public static string GetBinPath()
{
string baseDir = AppDomain.CurrentDomain.BaseDirectory;

        // Note RelativeSearchPath can be null even if the doc say something else; don't remove the check
        string searchPath = AppDomain.CurrentDomain.RelativeSearchPath ?? string.Empty;

        string relativeSearchPath = searchPath.Split(';').First();
        string binPath = Path.Combine(baseDir, relativeSearchPath);
        return binPath;
    }

[owenStarry]

I finally modify SetWinDllDirectory method as following:
private static void SetWinDllDirectory()
{
var path = GetBinPath();
var platform = Environment.Is64BitProcess ? "x64" : "x86";
if (!SetDllDirectory(Path.Combine(path, platform)))
Trace.TraceWarning($"{nameof(ZstdNet)}: Failed to set DLL directory to '{path}'");
}