Improve the Codes of Az.Accounts with Reference to Copilot (#27653)

Author: msJinLei

src/Accounts/Accounts/Account/ConnectAzureRmAccount.cs

@@ -17,6 +17,7 @@
 using Microsoft.Azure.Commands.Common.Authentication;
 using Microsoft.Azure.Commands.Common.Authentication.Abstractions;
 using Microsoft.Azure.Commands.Common.Authentication.Abstractions.Core;
+using Microsoft.Azure.Commands.Common.Authentication.Abstractions.Interfaces;
 using Microsoft.Azure.Commands.Common.Authentication.Abstractions.Models;
 using Microsoft.Azure.Commands.Common.Authentication.Config.Models;
 using Microsoft.Azure.Commands.Common.Authentication.Factories;
@@ -517,8 +518,7 @@ public override void ExecuteCmdlet()
                     return;
                 }
 
-                IHttpOperationsFactory httpClientFactory = null;
-                AzureSession.Instance.TryGetComponent(HttpClientOperationsFactory.Name, out httpClientFactory);
+                AzureSession.Instance.TryGetComponent(HttpClientOperationsFactory.Name, out IHttpOperationsFactory httpClientFactory);
 
                 SetContextWithOverwritePrompt((localProfile, profileClient, name) =>
                 {

src/Accounts/Accounts/CommonModule/EnvironmentExtensions.cs

@@ -342,7 +342,7 @@ internal static void CheckAndEnqueue<T>(this ConcurrentQueue<T> queue,  T item)
 
         internal static bool TryDequeueIfNotNull<T>(this ConcurrentQueue<T> queue, out T result)
         {
-            result = default(T);
+            result = default;
             if (null == queue)
             {
                 return false;

src/Accounts/Accounts/Token/GetAzureRmAccessToken.cs

@@ -19,6 +19,7 @@
 using Microsoft.Azure.Commands.ResourceManager.Common;
 using Microsoft.Azure.Commands.ResourceManager.Common.ArgumentCompleters;
 using Microsoft.Azure.PowerShell.Authenticators;
+using Microsoft.WindowsAzure.Commands.Common.CustomAttributes;
 using Microsoft.WindowsAzure.Commands.Utilities.Common;
 
 using System;
@@ -126,7 +127,7 @@ public override void ExecuteCmdlet()
                 UserId = accessToken.UserId,
             };
             result.ExpiresOn = (accessToken as MsalAccessToken)?.ExpiresOn ?? result.ExpiresOn;
-            if(result.ExpiresOn == default(DateTimeOffset))
+            if (result.ExpiresOn == default)
             {
                 try
                 {

src/Accounts/Authentication.ResourceManager/AzureRmProfile.cs

@@ -174,7 +174,7 @@ private void Load(IFileProvider provider)
 
         bool SafeDeserializeObject<T>(string serialization, out T result, JsonConverter converter = null)
         {
-            result = default(T);
+            result = default;
             bool success = false;
             try
             {
@@ -207,8 +207,7 @@ private void Initialize(AzureRmProfile profile)
                     EnvironmentTable[environment.Key] = environment.Value;
                 }
 
-                AzKeyStore keystore = null;
-                AzureSession.Instance.TryGetComponent(AzKeyStore.Name, out keystore);
+                AzureSession.Instance.TryGetComponent(AzKeyStore.Name, out AzKeyStore keystore);
 
                 foreach (var context in profile.Contexts)
                 {
@@ -249,8 +248,7 @@ private void LoadImpl(string contents)
         /// </summary>
         public AzureRmProfile RefillCredentialsFromKeyStore()
         {
-            AzKeyStore keystore = null;
-            AzureSession.Instance.TryGetComponent(AzKeyStore.Name, out keystore);
+            AzureSession.Instance.TryGetComponent(AzKeyStore.Name, out AzKeyStore keystore);
             AzureRmProfile ret = this.DeepCopy();
             if (keystore != null)
             {