Use `DbConnectionStringBuilder` instead of its OleDb equivalent.

Introduce some helper extension methods to access well defined OleDb properties, that `DbConnectionStringBuilder` knows nothing about.

src/EFCore.Jet/Migrations/JetMigrationsSqlGenerator.cs

@@ -3,7 +3,6 @@
 using System;
 using System.Collections.Generic;
 using System.Data.Jet;
-using System.Data.OleDb;
 using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -454,10 +453,14 @@ namespace EntityFrameworkCore.Jet.Migrations
             Check.NotNull(operation, nameof(operation));
             Check.NotNull(builder, nameof(builder));
 
-            var connectionStringBuilder = new OleDbConnectionStringBuilder(_options.ConnectionString);
-            var provider = string.IsNullOrEmpty(connectionStringBuilder.Provider)
-                ? JetConfiguration.OleDbDefaultProvider
-                : connectionStringBuilder.Provider;
+            var connectionStringBuilder = JetProviderFactory.Instance.CreateConnectionStringBuilder();
+            connectionStringBuilder.ConnectionString = _options.ConnectionString;
+
+            var provider = connectionStringBuilder.GetProvider();
+            if (string.IsNullOrEmpty(provider))
+            {
+                provider = JetConfiguration.OleDbDefaultProvider;
+            }
             
             builder
                 .Append("CREATE DATABASE ")

src/System.Data.Jet/DbConnectionStringBuilderExtensions.cs

@@ -0,0 +1,17 @@
+using System.Data.Common;
+
+namespace System.Data.Jet
+{
+    public static class DbConnectionStringBuilderExtensions
+    {
+        private const string ProviderKey = "Provider";
+
+        public static string GetProvider(this DbConnectionStringBuilder source)
+            => source.TryGetValue(ProviderKey, out var providerName)
+                ? providerName as string
+                : null;
+
+        public static void SetProvider(this DbConnectionStringBuilder source, string value)
+            => source[ProviderKey] = value;
+    }
+}

src/System.Data.Jet/JetProviderFactory.cs

@@ -66,9 +66,7 @@ namespace System.Data.Jet
         /// </returns>
         public override DbConnectionStringBuilder CreateConnectionStringBuilder()
         {
-            OleDbConnectionStringBuilder oleDbConnectionStringBuilder = new OleDbConnectionStringBuilder();
-            
-            return oleDbConnectionStringBuilder;
+            return new OleDbConnectionStringBuilder();
         }
 
         /// <summary>

src/System.Data.Jet/System.Data.Jet.csproj

@@ -97,6 +97,7 @@
     <Compile Include="LogHelper.cs" />
     <Compile Include="Messages.cs" />
     <Compile Include="OleDbColumnFlagEnum.cs" />
+    <Compile Include="DbConnectionStringBuilderExtensions.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Properties\Resources.Designer.cs" />
     <Compile Include="XmlObjectSerializer.cs" />