C#とWindows 11を使って特定の環境変数を持つAzure VMを作成するには、以下の手順に従う必要がある：

1.パッケージ・マネージャー・コンソールで以下のコマンドを実行して、Azure Management Libraries for .NETをインストールする：
``` 
Install-Package Microsoft.Azure.Management.Fluent
```
2.Azure Active Directory（AD）アプリを作成し、必要な権限を付与して認証を設定します。これは、AzureポータルまたはAzure CLIで行うことができます。アプリをセットアップした後、テナントID、クライアントID、クライアントシークレットを取得します。

3.Visual Studio で C# コンソールアプリケーションを作成し、以下の名前空間を追加します：
``` 
using Microsoft.Azure.Management.Compute.Fluent;
using Microsoft.Azure.Management.Compute.Fluent.Models;
using Microsoft.Azure.Management.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent.Authentication;
using Microsoft.Azure.Management.ResourceManager.Fluent.Core;
using System;
```
4.以下のコードを追加して、特定の環境変数を持つ Windows 11 VM を作成する：
``` 
public static async Task Main(string[] args)
{
    // Fill in your Azure AD app credentials
    var clientId = "YOUR_CLIENT_ID";
    var clientSecret = "YOUR_CLIENT_SECRET";
    var tenantId = "YOUR_TENANT_ID";
    var subscriptionId = "YOUR_SUBSCRIPTION_ID";

    // Authenticate with Azure
    var credentials = new AzureCredentials(new ServicePrincipalLoginInformation
    {
        ClientId = clientId,
        ClientSecret = clientSecret
    }, tenantId, AzureEnvironment.AzureGlobalCloud);

    // Initialize the Azure management client
    var azure = Azure.Authenticate(credentials).WithSubscription(subscriptionId);

    // Set up the VM configuration
    var groupName = "yourResourceGroup";
    var vmName = "yourVmName";
    var location = Region.USWest;

    // Create or update the resource group
    var resourceGroup = await azure.ResourceGroups.Define(groupName)
        .WithRegion(location)
        .CreateAsync();

    // Define the VM
    var vm = await azure.VirtualMachines.Define(vmName)
        .WithRegion(location)
        .WithExistingResourceGroup(resourceGroup)
        .WithNewPrimaryNetwork("10.0.0.0/28")
        .WithPrimaryPrivateIPAddressDynamic()
        .WithNewPrimaryPublicIPAddress("yourPublicIP")
        .WithPopularWindowsImage(KnownWindowsVirtualMachineImage.Windows11Pro)
        .WithAdminUsername("yourAdminUsername")
        .WithAdminPassword("yourAdminPassword")
        .WithSize(VirtualMachineSizeTypes.StandardD2sV3)
        .DefineNewExtension("CustomScriptExtension")
            .WithPublisher("Microsoft.Compute")
            .WithType("CustomScriptExtension")
            .WithVersion("1.10")
            .WithMinorVersionAutoUpgrade()
            .WithPublicSetting("fileUris", new List<string> { "https://yourScriptUrl/set-environment-variables.ps1" })
            .WithPublicSetting("commandToExecute", "powershell -ExecutionPolicy Unrestricted -File set-environment-variables.ps1")
            .Attach()
        .CreateAsync();

    Console.WriteLine("VM created!");
}
```
5.プレースホルダーを実際の Azure 認証情報およびその他の詳細情報に置き換えます。また、https://yourScriptUrl/set-environment-variables.ps1 を、環境変数を設定する PowerShell スクリプトの実際の URL に置き換える必要があります。

6.set-environment-variables.ps1 という名前の PowerShell スクリプトを作成し、一般にアクセス可能な場所にアップロードします。このスクリプトは、次のように目的の環境変数を設定します：
```
[System.Environment]::SetEnvironmentVariable("VAR_NAME1", "VAR_VALUE1", [System.EnvironmentVariableTarget]::Machine)
[System.Environment]::SetEnvironmentVariable("VAR_NAME2", "VAR_VALUE2", [System.EnvironmentVariableTarget]::Machine)
# Add more environment variables as needed

# Restart the VM to apply the environment variables
Restart-Computer -Force
```
VAR_NAME1、VAR_VALUE1、VAR_NAME2、およびVAR_VALUE2を、希望の環境変数名と値に置き換えます。必要に応じてさらに行を追加し、追加の環境変数を設定する。

このスクリプトは、マシン・レベルで環境変数を設定する。特定のユーザーに設定したい場合は、[System.EnvironmentVariableTarget]::Machineを[System.EnvironmentVariableTarget]::Userに置き換えてください。

これらの手順を完了すると、C# コンソール・アプリケーションは、指定された環境変数を持つ Azure VM を作成します。VMのオペレーティングシステムはWindows 11になります。Windows 11 イメージがまだ利用可能でない場合は、コード内の KnownWindowsVirtualMachineImage 列挙を更新する必要があるかもしれないことに注意してください。この場合、Windows Server イメージを使用し、手動で Windows 11 にアップグレードします。
To create an Azure VM with specific environment variables using C# and Windows 11, you need to follow these steps:

1. Install the Azure Management Libraries for .NET by running the following command in the Package Manager Console:
``` 
Install-Package Microsoft.Azure.Management.Fluent
``` 
2. Set up authentication by creating an Azure Active Directory (AD) app and granting it the required permissions. You can do this via the Azure portal or with the Azure CLI. Get the Tenant ID, Client ID, and Client Secret after setting up the app.

3. Create a C# console application in Visual Studio and add the following namespaces:
``` 
using Microsoft.Azure.Management.Compute.Fluent;
using Microsoft.Azure.Management.Compute.Fluent.Models;
using Microsoft.Azure.Management.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent;
using Microsoft.Azure.Management.ResourceManager.Fluent.Authentication;
using Microsoft.Azure.Management.ResourceManager.Fluent.Core;
using System;
``` 
4. Add the following code to create a Windows 11 VM with the specific environment variables:
``` 
public static async Task Main(string[] args)
{
    // Fill in your Azure AD app credentials
    var clientId = "YOUR_CLIENT_ID";
    var clientSecret = "YOUR_CLIENT_SECRET";
    var tenantId = "YOUR_TENANT_ID";
    var subscriptionId = "YOUR_SUBSCRIPTION_ID";

    // Authenticate with Azure
    var credentials = new AzureCredentials(new ServicePrincipalLoginInformation
    {
        ClientId = clientId,
        ClientSecret = clientSecret
    }, tenantId, AzureEnvironment.AzureGlobalCloud);

    // Initialize the Azure management client
    var azure = Azure.Authenticate(credentials).WithSubscription(subscriptionId);

    // Set up the VM configuration
    var groupName = "yourResourceGroup";
    var vmName = "yourVmName";
    var location = Region.USWest;

    // Create or update the resource group
    var resourceGroup = await azure.ResourceGroups.Define(groupName)
        .WithRegion(location)
        .CreateAsync();

    // Define the VM
    var vm = await azure.VirtualMachines.Define(vmName)
        .WithRegion(location)
        .WithExistingResourceGroup(resourceGroup)
        .WithNewPrimaryNetwork("10.0.0.0/28")
        .WithPrimaryPrivateIPAddressDynamic()
        .WithNewPrimaryPublicIPAddress("yourPublicIP")
        .WithPopularWindowsImage(KnownWindowsVirtualMachineImage.Windows11Pro)
        .WithAdminUsername("yourAdminUsername")
        .WithAdminPassword("yourAdminPassword")
        .WithSize(VirtualMachineSizeTypes.StandardD2sV3)
        .DefineNewExtension("CustomScriptExtension")
            .WithPublisher("Microsoft.Compute")
            .WithType("CustomScriptExtension")
            .WithVersion("1.10")
            .WithMinorVersionAutoUpgrade()
            .WithPublicSetting("fileUris", new List<string> { "https://yourScriptUrl/set-environment-variables.ps1" })
            .WithPublicSetting("commandToExecute", "powershell -ExecutionPolicy Unrestricted -File set-environment-variables.ps1")
            .Attach()
        .CreateAsync();

    Console.WriteLine("VM created!");
}
``` 
5. Replace placeholders with your actual Azure credentials and other details. You will also need to replace https://yourScriptUrl/set-environment-variables.ps1 with the actual URL of your PowerShell script that sets the environment variables.

6. Create a PowerShell script named set-environment-variables.ps1 and upload it to a publicly accessible location. The script should set your desired environment variables, like this:
```
[System.Environment]::SetEnvironmentVariable("VAR_NAME1", "VAR_VALUE1", [System.EnvironmentVariableTarget]::Machine)
[System.Environment]::SetEnvironmentVariable("VAR_NAME2", "VAR_VALUE2", [System.EnvironmentVariableTarget]::Machine)
# Add more environment variables as needed

# Restart the VM to apply the environment variables
Restart-Computer -Force
```
Replace VAR_NAME1, VAR_VALUE1, VAR_NAME2, and VAR_VALUE2 with your desired environment variable names and values. Add more lines as needed to set additional environment variables.

This script sets the environment variables at the machine level, which means they will be available for all users. If you want to set them for a specific user, replace [System.EnvironmentVariableTarget]::Machine with [System.EnvironmentVariableTarget]::User.

After completing these steps, your C# console application will create an Azure VM with the specified environment variables. The VM will have Windows 11 as its operating system. Note that you may need to update the KnownWindowsVirtualMachineImage enumeration in the code if the Windows 11 image is not yet available. In this case, use a Windows Server image and manually upgrade to Windows 11.