maxmind/geoip2-dotnet

MaxMind GeoIP2 .NET API

geoip2-dotnet's Issues

Retrieving "parent" CIDR block for an IP

Is there a way to retrieve the parent CIDR block for an IP address? In other words, the largest CIDR block where every address in that block has the same geolocation and ownership information of the IP being looked up.

Thanks!

powershell-core issue

Works fine in powershell 5.1.
However, in version 7.1 of the PowerShell-core, the following error occurs.

'[MaxMind.Db.Reader]::new($Database)
Exception calling ".ctor" with "1" argument(s): "Could not load type 'System.IO.MemoryMappedFiles.MemoryMappedFileSecurity' from
| assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'."

Running latest nuget on throws MethodAccessException

System.MethodAccessException: Method MaxMind.Db.Metadata:get_DatabaseType ()' is inaccessible from methodMaxMind.GeoIP2.DatabaseReader:Execute<MaxMind.GeoIP2.Responses.CountryResponse> (string,bool,string)
at MaxMind.GeoIP2.DatabaseReader.get_Metadata()
at MaxMind.GeoIP2.DatabaseReader.Execute[T](String ipAddress, Boolean hasTraits, String type)
at MaxMind.GeoIP2.DatabaseReader.Country(String ipAddress)

NuGet package versions installed are:
MaxMind.Db 1.0.0.0 (though dll version shows 0.2.1.0 ??)
MaxMind.GeoIP2 2.1.0.0

Thoughts?

Max Mind GeoIP2 0.3.0.0 only deploys through MSBuild with Rest Sharp version 104.3.3

Not sure if this is a bug but if you're using a new version of RestSharp it will not deploy correctly using MSBuild, either via the command or through the Publish feature inside Visual Studio.

Steps to recreate.

1. Install the latest version of RestSharp, should be something like 104.4.0 but anything greater than 104.3.3 via Nuget.
2. Install MaxMind GeoIP2 via Nuget.
3. Use MSBuild from command line or the "Publish..." feature inside Visual Studio and the RestSharp.dll will not be packaged as part of the output. This can be confirmed via the build output window inside Visual Studio with the "diagnostic" level set:

1> ResolveAssemblyReference: Could not resolve this reference. Could not locate the assembly "RestSharp, Version=104.3.3.0, Culture=neutral, PublicKeyToken=null". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.

Result: Examine the bin folder of your output and note that the RestSharp.dll is not there.
Expected result: RestSharp.dll should be in the bin.
Humble Suggestion Rather than have the dependency of RestSharp >= 104.3 in your nuget package file, make it a specific version requirement: RestSharp == 104.3.3 since that is what MSBuild will look for.
Note: Not sure, but this might be an issue on Microsoft's side (either MSBuild or Nuget).
Workaround:

PM> Install-Package RestSharp -Version 104.3.3

I have a sample test project that can be provided, if necessary.

Performance under scale for 'not found'

From documentation:
If an address is not available in the database, a AddressNotFoundException will be thrown.

If you have a hit rate that is high, throwing an exception for an IP city not found would probably be negligble. But, depending on your miss rate, an exception can be an unnecessary overhead expense on your code performance. Should a way to receive a result that indicates 'not found' vs an exception be supported?

NuGet version compiled against .NET Framework 4.5

It looks like we are forced to use Framework version 4.5.2 if we want to support .NET and Visual Studio, and forced to use 4.5 if we want to support MonoDevelop and Mono for OpenRA/OpenRA#10280 Could you add a net45 folder to the NuGet package to get us out of this dependency hell?

Why is sending user id and license key through constructor?

Why do we have to create concrete instance var client = new WebServiceClient(uid, licenseKey); to get response back? This is antipattern

RestSharp 105.1.0.0

Hello there,

I have downloaded GeoIP2-dotnet by nuget with depended assemblies. When I execute the following code:

int userID = "_";
string licenseKey = "_";
string ip = "***";

private readonly WebServiceClient client;
client = new WebServiceClient(userID, licenseKey);

CountryResponse response = client.Country(ip);

I get following exception at the last line of the code:

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in ***.Framework.Localization.dll

[System.IO.FileNotFoundException] = {"Could not load file or assembly 'RestSharp, Version=105.1.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.":"RestSharp, Version=105.1.0.0, Culture=neutral, PublicKeyToken=null"}

I have checked the bin if the assembly is there. And I have seen assembly is there and there is no error in references and packages.config. What is the problem?

Thanks

Versioning of dependency on Microsoft.Extensions.Options

Right now dependency on Microsoft.Extensions.Options is set to version 5.0.0 for all target frameworks.
This makes it impossible to use in Azure Functions as Azure Functions runtime is not yet updated to .NET 5.
Would it be possible to set this reference to lowest supported LTS version per target framework:

• 2.1.1 for netstandard2.0
• 3.1.11 for netstandard2.1
• 5.0.0 for net5.0

Json Serialization Drops Name fields

When I create a DatabaseReader object and complete a search for an IP that exists in the database, the CityResponse object contains values for the .Name fields. For example, CityResponse.City.Name =SomeCity. When I serialize this object using JsonConvert.SerializeObject(CityResponse) (part of Newtonsoft.Json.dll), the Name properties are not serialized. If I then use JsonConvert.DeserializeObject(jsonstring) to deserialize back to the object the .Name fields are null. Is there a way to ensure that the .Name fields are serialized with the rest of the object?

Example:
var city = loReader.City(lstrIP); // city.City.Name = cityname
var json = JsonConvert.SerializeObject(city);
var city2 = JsonConvert.DeserializeObject<MaxMind.GeoIP2.Responses.CityResponse>(json); //city2.City.Name = null

Could not load type 'RestSharp.HttpBasicAuthenticator' from assembly

I just installed the client from Nuget and I get a failure that looks like this:

Could not load type 'RestSharp.HttpBasicAuthenticator' from assembly 'RestSharp, Version=105.2.2.0, Culture=neutral, PublicKeyToken=null'.":"RestSharp.HttpBasicAuthenticator"}

on the line in my code that does this:
var webResponse = webServiceClient.City(ipAddress);

I believe your issue is related to RestSharp and sounds a lot like the same problem that Twilio describes here: http://stackoverflow.com/questions/32067529/twilio-restsharp-dependency

Not working with RestSharp 105.0.1

I have updated my project using NuGet to the latest MaxMind.db & MaxMind.GeoIP2 and RestSharp.

When I executing the code:

MaxMind.GeoIP2.Responses.CountryResponse country;
country = DBReader.Country(ipAddress);

I get the following exception:

[System.IO.FileNotFoundException] = {"Could not load file or assembly 'RestSharp, Version=105.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.":"RestSharp, Version=105.0.0.0, Culture=neutral, PublicKeyToken=null"}

I have downgraded RestSharp back to 105.0.0 which is working ok.

install Problem(install-package MaxMind.GeoIP2)

I will try install the maxmind.geoIP but not install maxmind.geoip show on the error. That error screen short herewith attached,so kindly verify the problem and also I am using only asp.net 4.5 frame work (visual studio 2012)only.

already added the elmah reference also.

Typo in documentation

Its not a big deal, but you guys have a typo in your docs.

http://maxmind.github.io/GeoIP2-dotnet/

var client = new WebServiceClient(42, "license_key1")); // extra closing bracket

DatabaseInfo

Hello,
we need something like the old method getDatabaseInfo to check availability of the databaseFile and confirmation of working geoIp environment.
Kind regards,

Stop throwing AddressNotFoundException when an address can't be found.

It might sound like a good idea to throw an AddressNotFoundException when a lookup can't be found but you should favor returning null or doing something else. Throwing one exception is fine but if you use this library in a high throughput system, there are performance issues you will run into....

"As MusiGenesis said, "Exceptions are slow in .NET if they are thrown"

So, yes, you don't want to throw too many of them. On my computer, a simple throw inside a loop, it took 9.5 seconds to throw 1000 exceptions, but that time would increase, were the exception to be buried inside a large stack.

That is why flow control should NOT be done by exceptions (I know your question didn't ask for anything other than the speed, but you can work that out yourself with a timed test). Sure, you should throw exceptions whenever something goes wrong. However, you should keep the number of things going wrong to a minimum. E.g. don't pass bad data to a function.

Ha, and every answer so far (including this) is talking about when to, and when not to throw exceptions. Ironic." http://stackoverflow.com/questions/161942/how-slow-are-net-exceptions

City returns empty for GeoLite2 database

I'm getting no City value when I lookup anything. I do get Country information though. Is this just not provided in the Lite database?

    [TestClass]
    public class DatabaseReaderTests
    {
        private DatabaseReader reader;

        [TestInitialize]
        public void Setup()
        {
            this.reader = new DatabaseReader("GeoLite2-City.mmdb", new[] { "en" }, FileAccessMode.Memory);
        }

        [DataTestMethod]
        [DataRow("213.171.195.48", "GB", "Gloucester")]
        [DataRow("31.13.65.36", "IE", "Dublin")]
        [DataRow("217.160.86.40", "DE", "Karlsruhe")]
        [DataRow("64.233.162.100", "US", "Mountain View")]
        [DataRow("13.77.161.179", "US", "Quincy")]
        public void City_IpAddressReturnsExpectedCountryAndCIty(string ipAddress, string expectedCountryCode, string expectedCity)
        {
            CityResponse city = this.reader.City(ipAddress);

            Assert.IsNotNull(city);
            Assert.AreEqual(expectedCountryCode, city.Country.IsoCode);
            Assert.AreEqual(expectedCity, city.City.Name);
        }
    }

Expose Routing Prefix as Provided by MaxMind-DB-Reader-dotnet

I wanted to provide a pull request to add the RoutingPrefix provided by MaxMind-DB-Reader-dotnet in version 2.0.0-beta3 to this library.

I was thinking it could be added as an additional overloaded version of TryIsp

 public bool TryIsp(IPAddress ipAddress, out IspResponse response, out int routingPrefix)

Would that work for y ou? Would you have a different preference for how to accomplish this?

How to consume geoip .net api or webservice from C# 2.0 based app

Hi Team,

We have bought licence of maxmind to use geoip to get location details of user registering on our website.
As part of integration with maxmind geoip's .net api with our .net based client, we understand we have to use these 2 nuget packages, which can be added to app done in .net framework 4.5, but in our case we have to consume geoip from webservice done in .net 2.0 and we can't migrate it to higher version, at least not soon.
Nugets:
https://www.nuget.org/packages/MaxMind.GeoIP2/
https://www.nuget.org/packages/MaxMind.Db/

Hence please let us know how can we consume maxmind geoip api in .net 2.0 app, either using any older version of your nuget packages or any direct webservice urls for instance of maxmind(also any documentation location for same for C# client).

If issue is not right place for such queries/concerns, then please move it to right place and please give us your inputs/solutions for issues we are facing. Thanks.

DatabaseReader slow

Judging from the published Benchmarks, the DatabaseReader appears to be quite slow. Actually by several orders of magnitude slower than the Java API.

I've wrote a test against GeoLite2-Country.mmdb. And on my Core i7 Development machine I was only to perform approx. 20k queries/sec. At first I thought that initializing the reader with a stream rather than a file which turns off caching. Picture my surprise when switching to a reader using memory-mapped-file based caching resulted in barely 11k queries/sec.

NuGet package, C#

Im facing an issue with the Webclient from the GeoIP2 nuget package, getting the error:
"The request was aborted: Could not create SSL/TLS secure channel.".

The error is not constantly occuring. It's very periodic, half a day - then just a few requests, then a few hours nonstop.

I'm using the nuget package without any modifications, tried switching from async to sync to eliminate any issues.

Any hint where i could look for potential issues on my side? Networking erros i could eliminate... no other SSL-encrypted request fails.

DatabaseReader constructor yields an exception on .Net Core / Windows 8.1

Hi,
I got a strange behavior with the DatabaseReader constructor with .Net Core on Windows 8.1. The mmdb does exist but I get a FileNotFoundException. When writing the very exact same code on a .Net 4.6 C# app, it loads without any problem. Any idea why?

Removing RestSharp as a dependency for in-memory database use

When using the in-memory database only, RestSharp shouldn't be a dependency. I understand this might mean maintaining two different ports of the library, but i wouldn't want unnecessary dependencies cluttering in my own library which uses MaxMind.

DatabaseReader is IDisposable for no reason

When I look at the code, I see that the DatabaseReader is IDisposable. The implementation of Dispose simply disposes the sub reader here

GeoIP2-dotnet/MaxMind.GeoIP2/DatabaseReader.cs

Line 95 in 346c8a8

_reader.Dispose();

Then, the Reader calls the Dispose of the buffer https://github.com/maxmind/MaxMind-DB-Reader-dotnet/blob/e229436fb61a15a545ecaae400060e9af2dbd54d/MaxMind.Db/Reader.cs#L225.

The Buffer is an ArrayBuffer that is also IDisposable but the implementation of Dispose has nothing to do since it only keeps data in memory: https://github.com/maxmind/MaxMind-DB-Reader-dotnet/blob/e229436fb61a15a545ecaae400060e9af2dbd54d/MaxMind.Db/ArrayBuffer.cs#L113

So, if my understanding is right, all this chain of IDisposable does nothing in the end and complexifies all the consumers that must properly Dispose the DatabaseReader. If possible, please consider removing IDisposable from DatabaseReader.

The type or namespace name 'GeoIP2' does not exist in the namespace 'MaxMind' when targeting .NET 4.0

Hi,

For some reason, I can't use the MaxMind.GeoIP2 namespace, I get the error saying it doesn't exist.
The type or namespace name 'GeoIP2' does not exist in the namespace 'MaxMind' (are you missing an assembly reference?)

I obviously had the dll referenced and checked in the object browser that the namespace exists in the DLL.

This is my code:

using MaxMind.GeoIP2;

namespace jifiti.Common.Location
{
    public class MaxMindGeoLocation
    {
        public GeoLocationResults GetGeoLocationData(string ipAddress)
        {
            using (var client = new WebServiceClient(11111, "AAAAA"))
            {
                // Do the lookup
                var response = client.City(ipAddress);

                return new GeoLocationResults
                           {
                               Country = response.Country.IsoCode,
                               CountryConfidence = response.Country.Confidence,
                               State = response.MostSpecificSubdivision.Name,
                               StateConfidence = response.MostSpecificSubdivision.Confidence,
                               City = response.City.Name,
                               CityConfidence = response.City.Confidence,
                               PostalCode = response.Postal.Code,
                               PostalCodeConfidence = response.Postal.Confidence
                           };
            }
        }
    }
}

Code not reflecting on NuGet

Hello, not too sure if its just me but i downloaded the NuGet package, just as the readme said in this file "install-package MaxMind.GeoIP2" upon trying to use the ASN database it does not exist, yet in this project it says it does. Is there anything missing? As i needed to use the ASN database for a project of mine but isnt coming up in my NuGet package. Would it be updated soon or how else can i install?
Thanks in advance.

Microsoft BCL Build warnings

Ever since updating to the latest nuget package I'm seeing:

Severity Code Description Project File Line
Warning All projects referencing Exceptionless.Core.csproj must install nuget package Microsoft.Bcl.Build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317569. Exceptionless.Insulation

Please remove this dependency for 4.5+ projects...

Private setters prevent unit testing

All of the properties of the response objects seem to have private setters. When trying to unit test functionality in my site that hits the MaxMind service, I can mock (using Moq) the interface behind the client (IGeoIP2Provider) to simulate responses, but I'm unable to manually create response objects because none of the setters are available.

Ideally, the setters would be public for testing purposes. Either that, or the response objects would be interfaces that could also be mocked for testing purposes.

Here is an example of what I would like to mock:

var response = new CityResponse
{
    Postal = new Postal {Code = "12345"}    //not possible because of private setters
};
Mock<IGeoIP2Provider> GeoProvider = new Mock<IGeoIP2Provider>();
GeoProvider.Setup(x => x.City(It.IsAny<string>())).Returns(response);

Mockable Metadata

Hi,

Is there any chance to define the Metadata property also on the IGeoIP2DatabaseReader interface?
It would serve well in unit testing.

Average lookup time for GeoIP2 vs Legacy

Using the Database in memory, we are seeing an average IP lookup time of 25ms for GeoIP2 vs 11ms for Legacy geoIP (for the country database). Has there been any performance optimization done yet on this library; or any planned before release? We also would be willing to help in any way.

Issue with dependency on Microsoft.Threading.Tasks DLL

I have created a .Net CLR user defined function to make the API call to the GeoIP2 webservice so that I can integrate directly into SQL Server 2014.

When I attempt to load the assembly, it blows up on Microsoft.Threading.Tasks.DLL because this has a dependency on mscorlib 2.0.5.0. I can't load mscorlib 2.0.5.0 into the database as it already has 4.o.x in its stack, so I am at an impasse. Is there any way you can remove this dependency?

The current version of the DLL in question is 1.0.168 and that has the following reference in it

// Assembly Reference mscorlib

Version: 2.0.5.0
Name: mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes

Now System.Threading.Tasks.dll has the correct reference of;

// Assembly Reference mscorlib

Version: 4.0.0.0
Name: mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

HELP!!!

Thanks,
Colm

request for constructing CityResponse members for unit testing

Hello,

There are quite a few optional parameters for the MaxMind.GeoIP2.Responses.CityResponse constructor. I would like to construct a CityResponse so I can provide it to a mock setup return call which will allow me to uni test mapping between objects in a .Net 4.6 c# environment. Can you please provide some examples for what parameters are needed for the following members:

City (I need to get City.Name)
Country (I need to get Country.IsoCode)
MostSpecificSubdivision (I need to get MostSpecificSubdivision.IsoCode)
Postal (I need to get Postal.Code)
Location (I need to get Location.Latitude and Location.Longitude)

This would be greatly appreciated.

Thanks,

Scott

Proper use of WebServiceClient in .NET Core

Hi,

I would like to have a sample of proper use of WebServiceClient in .NET Core.

If we use it with using (client = new WebServiceClient()), that is not good as we will have a bunch of connections opened too long, not doing anything.
You suggest in documentation to reuse it. OK, usually it is done with AddSingleton with DI, but there is an issue with DNS refreshing. In "old" Framework, you could deal with that with DnsRefreshTimeout. Also ConnectionLeaseTimeout etc.
There is no such thinsg in .NET Core. Therefore, they introduced IHttpClientFactory in 2.1 and it is dealing with those issues.

Now, how I do I achieve having a proper implementation in .NET Core?

BR,
Bojan

AddressNotFoundException error

Hello,

I am trying to that code https://pastebin.com/pa8LWXsA but when the IP is 103.8.195.34 i am getting an error.

Error Message:

Plugin MaxMind.GeoIP2.dll caused an error
 
 MaxMind.GeoIP2.Exceptions.AddressNotFoundException: The address 103.8.195.34 is not in the database.
   at MaxMind.GeoIP2.DatabaseReader.Execute[T](String ipStr, IPAddress ipAddress, String type, Boolean throwOnNullResponse)
   at MaxMind.GeoIP2.DatabaseReader.Execute[T](String ipStr, String type, Boolean throwOnNullResponse)
   at MaxMind.GeoIP2.DatabaseReader.Country(String ipAddress)
   at GeoIP2CountryPlugin.GeoIP2CountryPlugin.GeoIPIdentifier(RegisteredIdentifierArgs argument)

Any idea how to fix this error in the above code?

• Thanks!

No Async support in DatabaseReader?

I'm adding GeoIP2 (city database) lookup support in asp.net webapi, but don't see any async methods? Async is a much more efficient programming paradigm for server environments, so how come there is no async support?

Separate local database and Web API in different DLLs

We are using your cool GeoLite2 databases in our Open Source RTS game engine recreation project @OpenRA since version 1 of your .NET API:

• OpenRA/OpenRA#6902
• OpenRA/OpenRA#4666
• OpenRA/OpenRA#3647

Thanks for that already!

We now depend on Newtonsoft.Json.dll and RestSharp.dll although we don't use any JSON or REST anywhere in the game. It is just a hard dependency of your GeoIP2 library. Therefore I suggest to separate the local database parsing and the Web API into separate DLLs of the same project so we and others can avoid unnecessary dependencies.

DatabaseReader overload that takes a stream and mapping mode.

I have been storing my geoip database in azure blob storage and passing a stream of that database file to the database reader. However, I just realized that all my calls to the database are slow... And the default mode is MemoryMapped instead of in memory. Can you please add an overload that allows me to load the entire database in memory.

Databasereader Not enough storage not solved

I downloaded the latest version and although some of the code has been changed, when I create a new reader on every client request it still throws this exception. I understand that you advise to use only 1 instance, but in a WEB API environment (which is stateless) it is not advisable to share instances. In a WEB API environment I would strongly suggest to move to an MS SQL Database and use Entity Framework to solve the memory issue. I will export the Maxmind csv to my SQL DB and work from there. Hopefully the GEOIP2 sees an update in the future to be more WEB API compatible.

Cache the database

Hi,

Is there any suggested practice to cache the database (the one I'm using is GeoIP2-Country.mmdb)?

What I would like to do is, when my web applications launch, I cache the database so that for every coming requests, I can look up the cache directly instead of instantiate DatabaseReader every time. And if there's updated database, I can overwrite the old one while my applications are still running.

Would that be possible? Thanks.

Inconsistent ToString output

CountryResponse starts as Country [...

GeoIP2-dotnet/GeoIP2/Responses/AbstractCountryResponse.cs

Line 84 in 4e56dc9

return "Country ["

CityResponse starts as CityResponse [...

GeoIP2-dotnet/GeoIP2/Responses/AbstractCityResponse.cs

Line 105 in 4e56dc9

return this.GetType().Name + " ["

one uses type name, one doesn't. No big deal though.

Load all databases (City, Country, ASN) on startup

I am currently trying to implement a backend service which in the end should be able to do IP lookups with the three databases "City", "Country" and "ASN".

For performance reasons, I'd like to initiate the DatabaseReader on startup and then utilize it whenever I want to do a Query, so that the DB-File does not need to be accessed for every lookup.

To do so, I tried to add this to "Program.cs":
builder.Services.AddSingleton(maxmindASN => new DatabaseReader("GeoLite2-ASN.mmdb"));

This works and I'm able to query data. However, when I want to add the "City" and "Country" databases, I am unable to register them the same way, as only one of the 3 DBs is initiated.

Is there any recommended way on how to initiate the 3 DBs in the same application on startup, so that they can be shared?

Thanks in advance!

Can't install nuget package

I can't seem to get the nuget package to install. The Solution is .net 4.5. Any ideas?

Added file 'packages.config'.
Successfully added 'Newtonsoft.Json 7.0.1' to newproject.
For adding package 'Newtonsoft.Json 7.0.1' to project 'newproject' that targets 'net45',
>> PowerShell scripts are being executed from 'tools' (not framework-specific)
Executing script file 'C:\Blah\packages\Newtonsoft.Json.7.0.1\tools\install.ps1'.
Adding 'MaxMind.Db 1.2.0' to newproject.
For adding package 'MaxMind.Db 1.2.0' to project 'newproject' that targets 'net45',
>> Assembly references are being added from 'lib\net40'
Added reference 'MaxMind.Db' to project 'newproject'
Added file 'packages.config'.
Successfully added 'MaxMind.Db 1.2.0' to newproject.
Adding 'Microsoft.Bcl.Async 1.0.168' to newproject.
For adding package 'Microsoft.Bcl.Async 1.0.168' to project 'newproject' that targets 'net45',
>> Assembly references are being added from 'lib\net40'
Install failed. Rolling back...
System call failed. (Exception from HRESULT: 0x80010100 (RPC_E_SYS_CALL_FAILED))

Does not support DNX project

MaxMind.GeoIP2 package currently can't be used in ASP.NET 5 vNext project. This is the output after installing it to a fresh new project:

NU1002  The dependency MaxMind.Db 1.2.0 in project WebApplication1 does not support framework DNXCore,Version=v5.0. WebApplication1 D:\Desktop\WebApplication1\src\WebApplication1\project.json 1   
NU1002  The dependency MaxMind.GeoIP2 2.5.0 in project WebApplication1 does not support framework DNXCore,Version=v5.0. WebApplication1 D:\Desktop\WebApplication1\src\WebApplication1\project.json 11  
NU1002  The dependency MaxMind.GeoIP2 2.5.0 in project WebApplication1 does not support framework DNX,Version=v4.5.1.   WebApplication1 D:\Desktop\WebApplication1\src\WebApplication1\project.json 11  

async/await version

Hi,

Please add a non-blocking async/await version, so we can call it this way:

var client = new WebServiceClient(42, "abcdef12345");
var omni = await client.OmniAsync("128.101.101.101");

It's very important for programs that using .NET 4.5 or a later version.

Installation doesn't work

Running PowerShell 7, and 5.1
NuGet repo is set to api.nuget.org/v3

install-package MaxMind.GeoIP2 gives errors:
`Install-Package : The current environment doesn't have a solution open.
At line:1 char:1

• Install-Package MaxMind.GeoIP2

•   + CategoryInfo          : InvalidOperation: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetNoActiveSolution,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand`
  
  

Downloading the nupkg and installing doesn't work either. The nupgk site lists v2 api endpoint, and using v3 I can't find nor install the package.

Documentation confusion about multi-threading City calls

In the documentation at http://maxmind.github.io/GeoIP2-dotnet/, under the "City Service (Sync)" section, it states this:

This creates a WebServiceClient object that can be reused across requests.

But the example shows this code sample:

using (var client = new WebServiceClient(42, "license_key"))

That obviously does not create a reusable WebServiceClient object, as it is disposed of at the end of the using statement, so what does the comment mean that it can be "reused across requests"?

We were interested in creating one WebServiceClient object and using that to convert all IPs to geo, but we're assuming one WebServiceClient can't handle multiple threads using one object to check IPs, correct?