public static AdoProviderMetadata GetMetadata(Type connectionType)
{
var adoProviderMetadataItemsCopy = adoProviderMetadataItems;
for (var index = 0; index < adoProviderMetadataItemsCopy.Length; index++)
{
var adoProvideMetadata = adoProviderMetadataItemsCopy[index];
if (ReferenceEquals(adoProvideMetadata.connectionType, connectionType))
{
return(adoProvideMetadata);
}
}
var newAdoProviderMetadataItems = new AdoProviderMetadata[adoProviderMetadataItemsCopy.Length + 1];
Array.Copy(adoProviderMetadataItemsCopy, 0, newAdoProviderMetadataItems, 1, adoProviderMetadataItemsCopy.Length);
newAdoProviderMetadataItems[0] = new AdoProviderMetadata(connectionType);
adoProviderMetadataItems = newAdoProviderMetadataItems;
return(newAdoProviderMetadataItems[0]);
}
internal static DataReaderDeserializer Create(Type connectionType, Type type, string[] columnNames, Type[] columnTypes)
{
var adoProviderMetadata = AdoProviderMetadata.GetMetadata(connectionType);
var dataReaderMetadata = adoProviderMetadata.DataReaderMetadata;
var moduleBuilder = DynamicAssembly.GetExistingDynamicAssemblyOrCreateNew(type.Assembly);
var enumeratorType = typeof(IEnumerator <>).MakeGenericType(type);
var enumerableType = typeof(IEnumerable <>).MakeGenericType(type);
var dataReaderDeserializerType = typeof(DataReaderDeserializer);
var typeName = DynamicAssembly.GetUniqueTypeName("DbMap.Runtime." + type.Name + nameof(DataReaderDeserializer));
var typeBuilder = moduleBuilder.DefineType(typeName, TypeAttributes.Sealed, dataReaderDeserializerType, new[] { enumeratorType, enumerableType });
var fieldMap = new FieldMap(typeBuilder);
// Fields
var readerField = typeBuilder.DefineField("reader", DbDataReaderType, FieldAttributes.Private);
var commandField = typeBuilder.DefineField("command", typeof(DbCommand), FieldAttributes.Private);
// .ctor()
{
var constructor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Type.EmptyTypes);
var il = constructor.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, typeof(object).GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Ret);
}
// .ctor(DbCommand, DbDataReader)
var dataReaderDeserializerConstructor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, DeserializeAllParameters);
{
var il = dataReaderDeserializerConstructor.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, typeof(object).GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Stfld, commandField);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_2);
il.Emit(OpCodes.Stfld, readerField);
il.Emit(OpCodes.Ret);
}
// Reset()
{
var method = typeBuilder.DefineMethod("Reset", MethodAttributes.Public | MethodAttributes.Virtual);
var il = method.GetILGenerator();
il.ThrowException(typeof(NotSupportedException));
il.Emit(OpCodes.Ret);
}
// Dispose()
{
var method = typeBuilder.DefineMethod("Dispose", MethodAttributes.Public | MethodAttributes.Virtual);
var il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, readerField);
il.Emit(OpCodes.Call, dataReaderMetadata.DisposeMethod);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, commandField);
il.Emit(OpCodes.Call, DbCommandMetadata.Dispose);
il.Emit(OpCodes.Ret);
}
// MoveNext()
{
var method = typeBuilder.DefineMethod("MoveNext", MethodAttributes.Public | MethodAttributes.Virtual, typeof(bool), Type.EmptyTypes);
var il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, readerField);
il.Emit(OpCodes.Call, dataReaderMetadata.ReadMethod);
il.Emit(OpCodes.Ret);
}
// TReturn Deserialize<TReturn>(DBDataReader)
var deserializeMethod = typeBuilder.DefineMethod(nameof(DataReaderDeserializer.Deserialize), MethodAttributes.Public | MethodAttributes.Virtual);
{
var returnTypeParameter = deserializeMethod.DefineGenericParameters("TReturn")[0];
deserializeMethod.SetReturnType(returnTypeParameter);
deserializeMethod.SetParameters(DbDataReaderTypeArray);
var il = deserializeMethod.GetILGenerator();
EmitDeserializeType(dataReaderMetadata, fieldMap, il, type, columnNames, columnTypes);
il.Emit(OpCodes.Ret);
}
// IEnumerable<TReturn> DeserializeAll<TReturn>(DbCommand, DbDataReader)
{
var deserializeAllMethod = typeBuilder.DefineMethod(nameof(DataReaderDeserializer.DeserializeAll), MethodAttributes.Public | MethodAttributes.Virtual);
var returnTypeParameter = deserializeAllMethod.DefineGenericParameters("TReturn")[0];
deserializeAllMethod.SetReturnType(typeof(IEnumerable <>).MakeGenericType(returnTypeParameter));
deserializeAllMethod.SetParameters(DeserializeAllParameters);
var il = deserializeAllMethod.GetILGenerator();
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ldarg_2);
il.Emit(OpCodes.Newobj, dataReaderDeserializerConstructor);
il.Emit(OpCodes.Ret);
}
// TReturn Current { get; }
{
var property = typeBuilder.DefineProperty("Current", PropertyAttributes.None, type, Type.EmptyTypes);
var propertyGet = typeBuilder.DefineMethod("get_Current", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual, type, Type.EmptyTypes);
var il = propertyGet.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, readerField);
il.Emit(OpCodes.Call, deserializeMethod.MakeGenericMethod(type));
il.Emit(OpCodes.Ret);
property.SetGetMethod(propertyGet);
}
// object Current { get; }
{
var property = typeBuilder.DefineProperty("Current", PropertyAttributes.HasDefault, typeof(object), Type.EmptyTypes);
var propertyGet = typeBuilder.DefineMethod("get_Current", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual, typeof(object), Type.EmptyTypes);
var il = propertyGet.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, readerField);
il.Emit(OpCodes.Call, deserializeMethod.MakeGenericMethod(type));
il.Emit(OpCodes.Castclass, typeof(object));
il.Emit(OpCodes.Ret);
property.SetGetMethod(propertyGet);
}
// IEnumerator<TReturn> GetEnumerator()
{
var method = typeBuilder.DefineMethod("GetEnumerator", MethodAttributes.Public | MethodAttributes.Virtual, enumeratorType, Type.EmptyTypes);
var il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ret);
}
// IEnumerator GetEnumerator()
{
var method = typeBuilder.DefineMethod("GetEnumerator", MethodAttributes.Public | MethodAttributes.Virtual, typeof(IEnumerator), Type.EmptyTypes);
var il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, typeof(IEnumerator));
il.Emit(OpCodes.Ret);
}
return((DataReaderDeserializer)Activator.CreateInstance(typeBuilder.CreateTypeInfo()));
}
