Standardise API on all platforms.

Author: bgrainger

src/MySqlConnector/MySqlClient/MySqlDataReader.cs

@@ -238,19 +238,11 @@ public override void Close()
 		}
 #endif
 
-#if NETSTANDARD1_3 || NETSTANDARD2_0
 		public ReadOnlyCollection<DbColumn> GetColumnSchema()
-#else
-		public ReadOnlyCollection<MySqlDbColumn> GetColumnSchema()
-#endif
 		{
 			return GetResultSet().ColumnDefinitions
-				.Select((c, n) => new MySqlDbColumn(n, c, GetFieldType(n), GetDataTypeName(n)))
-#if NETSTANDARD1_3 || NETSTANDARD2_0
-				.Cast<DbColumn>()
-#endif
-				.ToList()
-				.AsReadOnly();
+				.Select((c, n) => (DbColumn) new MySqlDbColumn(n, c, GetFieldType(n), GetDataTypeName(n)))
+				.ToList().AsReadOnly();
 		}
 
 		public override T GetFieldValue<T>(int ordinal)

src/MySqlConnector/MySqlClient/MySqlDbColumn.cs

@@ -1,13 +1,42 @@
 using System;
-using System.Data.Common;
 using MySql.Data.Serialization;
 
-namespace MySql.Data.MySqlClient
+#if !NETSTANDARD1_3 && !NETSTANDARD2_0
+namespace System.Data.Common
 {
-	public sealed class MySqlDbColumn
-#if NETSTANDARD1_3 || NETSTANDARD2_0
-		: DbColumn
+	public abstract class DbColumn
+	{
+		public bool? AllowDBNull { get; protected set; }
+		public string BaseCatalogName { get; protected set; }
+		public string BaseColumnName { get; protected set; }
+		public string BaseSchemaName { get; protected set; }
+		public string BaseServerName { get; protected set; }
+		public string BaseTableName { get; protected set; }
+		public string ColumnName { get; protected set; }
+		public int? ColumnOrdinal { get; protected set; }
+		public int? ColumnSize { get; protected set; }
+		public bool? IsAliased { get; protected set; }
+		public bool? IsAutoIncrement { get; protected set; }
+		public bool? IsExpression { get; protected set; }
+		public bool? IsHidden { get; protected set; }
+		public bool? IsIdentity { get; protected set; }
+		public bool? IsKey { get; protected set; }
+		public bool? IsLong { get; protected set; }
+		public bool? IsReadOnly { get; protected set; }
+		public bool? IsUnique { get; protected set; }
+		public int? NumericPrecision { get; protected set; }
+		public int? NumericScale { get; protected set; }
+		public string UdtAssemblyQualifiedName { get; protected set; }
+		public Type DataType { get; protected set; }
+		public string DataTypeName { get; protected set; }
+		public virtual object this[string property] => null;
+	}
+}
 #endif
+
+namespace MySql.Data.MySqlClient
+{
+	public sealed class MySqlDbColumn : System.Data.Common.DbColumn
 	{
 		internal MySqlDbColumn(int ordinal, ColumnDefinitionPayload column, Type type, string dataTypeName)
 		{
@@ -47,30 +76,5 @@ internal MySqlDbColumn(int ordinal, ColumnDefinitionPayload column, Type type, s
 		}
 
 		public int ProviderType { get; }
-
-#if !NETSTANDARD1_3 && !NETSTANDARD2_0
-		public bool? AllowDBNull { get; }
-		public string BaseCatalogName { get; }
-		public string BaseColumnName { get; }
-		public string BaseSchemaName { get; }
-		public string BaseTableName { get; }
-		public string ColumnName { get; }
-		public int? ColumnOrdinal { get; }
-		public int? ColumnSize { get; }
-		public Type DataType { get; }
-		public string DataTypeName { get; }
-		public bool? IsAliased { get; }
-		public bool? IsAutoIncrement { get; }
-		public bool? IsExpression { get; }
-		public bool? IsHidden { get; }
-		public bool? IsIdentity { get; }
-		public bool? IsKey { get; }
-		public bool? IsLong { get; }
-		public bool? IsReadOnly { get; }
-		public bool? IsUnique { get; }
-		public int? NumericPrecision { get; }
-		public int? NumericScale { get; }
-		public string UdtAssemblyQualifiedName { get; }
-#endif
 	}
 }