turn off implicit usings to make .net462 happy

Author: stephenatsembit

.gitignore

@@ -6,3 +6,4 @@ test/DataStax.AstraDB.DataApi.IntegrationTests/obj
 test/DataStax.AstraDB.DataAPI.IntegrationTests/appsettings.sample.json
 test/DataStax.AstraDB.DataApi.UnitTests/bin
 test/DataStax.AstraDB.DataApi.UnitTests/obj
+appsettings.json

src/DataStax.AstraDB.DataApi/Admin/AstraDatabasesAdmin.cs

@@ -18,6 +18,11 @@
 using DataStax.AstraDB.DataApi.Core;
 using DataStax.AstraDB.DataApi.Core.Commands;
 using DataStax.AstraDB.DataApi.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
 
 namespace DataStax.AstraDB.DataApi.Admin;
 
@@ -45,11 +50,11 @@ public List<string> ListDatabaseNames()
         return ListDatabases().Select(db => db.Info.Name).ToList();
     }
 
-	public async Task<List<string>> ListDatabaseNamesAsync()
-	{
-		var databases = await ListDatabasesAsync().ConfigureAwait(false);
-		return databases.Select(db => db.Info.Name).ToList();
-	}
+    public async Task<List<string>> ListDatabaseNamesAsync()
+    {
+        var databases = await ListDatabasesAsync().ConfigureAwait(false);
+        return databases.Select(db => db.Info.Name).ToList();
+    }
 
     public List<DatabaseInfo> ListDatabases()
     {
@@ -64,7 +69,7 @@ public async Task<List<DatabaseInfo>> ListDatabasesAsync()
     internal async Task<List<DatabaseInfo>> ListDatabasesAsync(bool runSynchronously)
     {
         var command = CreateCommand().AddUrlPath("databases");
-        var response = await command.RunAsyncRaw<List<DatabaseInfo>>(System.Net.Http.HttpMethod.Get, runSynchronously).ConfigureAwait(false);
+        var response = await command.RunAsyncRaw<List<DatabaseInfo>>(HttpMethod.Get, runSynchronously).ConfigureAwait(false);
         return response;
     }
 
@@ -157,7 +162,7 @@ internal async Task<DatabaseInfo> GetDatabaseInfoAsync(Guid id, bool runSynchron
     {
         Guard.NotEmpty(id, nameof(id));
         var command = CreateCommand().AddUrlPath("databases").AddUrlPath(id.ToString());
-        var response = await command.RunAsyncRaw<DatabaseInfo>(System.Net.Http.HttpMethod.Get, runSynchronously).ConfigureAwait(false);
+        var response = await command.RunAsyncRaw<DatabaseInfo>(HttpMethod.Get, runSynchronously).ConfigureAwait(false);
         return response;
     }
 

src/DataStax.AstraDB.DataApi/Admin/IDatabaseAdmin.cs

@@ -16,6 +16,8 @@
 
 using DataStax.AstraDB.DataApi.Core;
 using DataStax.AstraDB.DataApi.Core.Results;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 
 namespace DataStax.AstraDB.DataApi.Admin;
 

src/DataStax.AstraDB.DataApi/Collections/Collection.cs

@@ -17,7 +17,9 @@
 using DataStax.AstraDB.DataApi.Core;
 using DataStax.AstraDB.DataApi.Core.Commands;
 using DataStax.AstraDB.DataApi.Utils;
+using System;
 using System.Text.Json.Serialization;
+using System.Threading.Tasks;
 
 namespace DataStax.AstraDB.DataApi.Collections;
 

src/DataStax.AstraDB.DataApi/Core/ApiData.cs

@@ -15,6 +15,7 @@
  */
 
 using DataStax.AstraDB.DataApi.Collections;
+using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 namespace DataStax.AstraDB.DataApi.Core;

src/DataStax.AstraDB.DataApi/Core/ApiResponse.cs

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 namespace DataStax.AstraDB.DataApi.Core;

src/DataStax.AstraDB.DataApi/Core/ApiVector.cs

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+using System;
+using System.Linq;
+
 namespace DataStax.AstraDB.DataApi.Core;
 
 //TODO: placeholder

src/DataStax.AstraDB.DataApi/Core/CommandOptions.cs

@@ -15,6 +15,7 @@
  */
 
 using DataStax.AstraDB.DataApi.Utils;
+using System.Linq;
 
 namespace DataStax.AstraDB.DataApi.Core;
 

src/DataStax.AstraDB.DataApi/Core/Commands/Command.cs

@@ -15,10 +15,14 @@
  */
 
 using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Text;
 using System.Text.Json;
+using System.Threading.Tasks;
 
 namespace DataStax.AstraDB.DataApi.Core.Commands;
 
@@ -29,7 +33,7 @@ public class Command
     private readonly DataApiClient _client;
     private readonly CommandUrlBuilder _urlBuilder;
     private readonly string _name;
-    private List<String> _urlPaths = new();
+    private List<string> _urlPaths = new();
 
     internal object Payload { get; set; }
     internal string UrlPostfix { get; set; }

src/DataStax.AstraDB.DataApi/Core/Database.cs

@@ -17,6 +17,7 @@
 using DataStax.AstraDB.DataApi.Collections;
 using DataStax.AstraDB.DataApi.Core.Commands;
 using DataStax.AstraDB.DataApi.Utils;
+using System.Threading.Tasks;
 
 namespace DataStax.AstraDB.DataApi.Core;