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# 使用 IAM 身分驗證搭配 Gremlin .NET 連線至 Amazon Neptune 資料庫
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## 概觀
<a name="gremlin-dotnet-iam-auth-overview"></a>

 本指南示範如何使用 Gremlin .NET 驅動程式、Signature Version 4 身分驗證和適用於 .NET v3 的 AWS SDK，以啟用 IAM 身分驗證連線至 Amazon Neptune 資料庫。

## 建立基本連線
<a name="gremlin-dotnet-iam-auth-basic-connection"></a>

 若要與 Gremlin .NET 連線，請使用自訂程式庫 [https://github.com/aws/amazon-neptune-gremlin-dotnet-sigv4 ](https://github.com/aws/amazon-neptune-gremlin-dotnet-sigv4)中的`SigV4RequestSigner`來源檔案。範例專案設定位於 https：//[https://github.com/aws/amazon-neptune-gremlin-dotnet-sigv4/tree/main/example](https://github.com/aws/amazon-neptune-gremlin-dotnet-sigv4/tree/main/example)。

專案檔案：

```
<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp8.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include="../src/SigV4RequestSigner.cs" Link="SigV4RequestSigner.cs" />
    <PackageReference Include="AWSSDK.Core" Version="3.7.402.24" />
    <PackageReference Include="gremlin.net" Version="3.7.3" />
  </ItemGroup>

</Project>
```

範例程式：

```
using System;
using System.Collections.Generic;
using System.Net.WebSockets;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using Gremlin.Net;
using Gremlin.Net.Driver;
using Gremlin.Net.Driver.Remote;
using Gremlin.Net.Process;
using Gremlin.Net.Process.Traversal;
using Gremlin.Net.Structure;
using static Gremlin.Net.Process.Traversal.AnonymousTraversalSource;
using static Gremlin.Net.Process.Traversal.__;
using static Gremlin.Net.Process.Traversal.P;
using static Gremlin.Net.Process.Traversal.Order;
using static Gremlin.Net.Process.Traversal.Operator;
using static Gremlin.Net.Process.Traversal.Pop;
using static Gremlin.Net.Process.Traversal.Scope;
using static Gremlin.Net.Process.Traversal.TextP;
using static Gremlin.Net.Process.Traversal.Column;
using static Gremlin.Net.Process.Traversal.Direction;
using static Gremlin.Net.Process.Traversal.T;
using Amazon.Runtime.CredentialManagement;
using Amazon.Runtime;
using Amazon;
using Amazon.Util;
using Amazon.Neptune.Gremlin.Driver;

namespace NeptuneExample
{
    class Program
    {
        static void Main(string[] args)
        {
            /*
                Include your Neptune endpoint and port below.
            */
            var neptune_host = "neptune-endpoint"; // ex: mycluster.cluster.us-east-1.neptune.amazonaws.com
            var neptune_port = 8182;

            var gremlinServer = new GremlinServer(neptune_host, neptune_port);
            var gremlinClient = new GremlinClient(gremlinServer, webSocketConfiguration: new SigV4RequestSigner().signRequest(neptune_host, neptune_port));
            var remoteConnection = new DriverRemoteConnection(gremlinClient);
            var g = Traversal().WithRemote(remoteConnection);

            /* Example code to pull the first 5 vertices in a graph. */
            Console.WriteLine("Get List of Node Labels:");
            Int32 limitValue = 5;
            var output = g.V().Limit<Vertex>(limitValue).ToList();
            foreach(var item in output) {
                Console.WriteLine(item);
            }
        }
    }
}
```