/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected virtual Expression CreateReadShadowValueExpression(
[CanBeNull] ParameterExpression parameter,
[NotNull] IPropertyBase property)
=> Expression.Call(
parameter,
InternalEntityEntry.ReadShadowValueMethod.MakeGenericMethod(property.ClrType),
Expression.Constant(property.GetShadowIndex()));
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override Expression CreateReadShadowValueExpression(
ParameterExpression parameter, IPropertyBase property)
=> Expression.Convert(
Expression.Call(
parameter,
ValueBuffer.GetValueMethod,
Expression.Constant(property.GetShadowIndex())),
property.ClrType);
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected override void WritePropertyValue(IPropertyBase propertyBase, object value)
{
if (!propertyBase.IsShadowProperty)
{
base.WritePropertyValue(propertyBase, value);
}
else
{
_shadowValues[propertyBase.GetShadowIndex()] = value;
}
}
private static Func <InternalEntityEntry, TProperty> CreateCurrentValueGetter <TProperty>(
IPropertyBase propertyBase, bool useStoreGeneratedValues)
{
var entityClrType = propertyBase.DeclaringType.ClrType;
var entryParameter = Expression.Parameter(typeof(InternalEntityEntry), "entry");
var shadowIndex = propertyBase.GetShadowIndex();
Expression currentValueExpression;
if (shadowIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadShadowValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(shadowIndex));
}
else
{
var convertedExpression = Expression.Convert(
Expression.Property(entryParameter, "Entity"),
entityClrType);
currentValueExpression = Expression.MakeMemberAccess(
convertedExpression,
propertyBase.GetMemberInfo(forConstruction: false, forSet: false));
if (currentValueExpression.Type != typeof(TProperty))
{
currentValueExpression = Expression.Convert(currentValueExpression, typeof(TProperty));
}
}
var storeGeneratedIndex = propertyBase.GetStoreGeneratedIndex();
if (useStoreGeneratedValues &&
storeGeneratedIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadStoreGeneratedValueMethod.MakeGenericMethod(typeof(TProperty)),
currentValueExpression,
Expression.Constant(storeGeneratedIndex));
}
return(Expression.Lambda <Func <InternalEntityEntry, TProperty> >(
currentValueExpression,
entryParameter)
.Compile());
}
private static Func <IUpdateEntry, TProperty> CreateCurrentValueGetter <TProperty>(
IPropertyBase propertyBase,
bool useStoreGeneratedValues)
{
var entityClrType = propertyBase.DeclaringType.ClrType;
var updateParameter = Expression.Parameter(typeof(IUpdateEntry), "entry");
var entryParameter = Expression.Convert(updateParameter, typeof(InternalEntityEntry));
var shadowIndex = propertyBase.GetShadowIndex();
Expression currentValueExpression;
if (shadowIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadShadowValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(shadowIndex));
}
else
{
var convertedExpression = Expression.Convert(
Expression.Property(entryParameter, "Entity"),
entityClrType);
var memberInfo = propertyBase.GetMemberInfo(forMaterialization: false, forSet: false);
currentValueExpression = PropertyBase.CreateMemberAccess(propertyBase, convertedExpression, memberInfo);
if (currentValueExpression.Type != typeof(TProperty))
{
currentValueExpression = Expression.Condition(
currentValueExpression.MakeHasDefaultValue(propertyBase),
Expression.Constant(default(TProperty), typeof(TProperty)),
Expression.Convert(currentValueExpression, typeof(TProperty)));
}
}
var storeGeneratedIndex = propertyBase.GetStoreGeneratedIndex();
if (storeGeneratedIndex >= 0)
{
if (useStoreGeneratedValues)
{
currentValueExpression = Expression.Condition(
Expression.Equal(
currentValueExpression,
Expression.Constant(default(TProperty), typeof(TProperty))),
Expression.Call(
entryParameter,
InternalEntityEntry.ReadStoreGeneratedValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(storeGeneratedIndex)),
currentValueExpression);
}
currentValueExpression = Expression.Condition(
Expression.Equal(
currentValueExpression,
Expression.Constant(default(TProperty), typeof(TProperty))),
Expression.Call(
entryParameter,
InternalEntityEntry.ReadTemporaryValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(storeGeneratedIndex)),
currentValueExpression);
}
return(Expression.Lambda <Func <IUpdateEntry, TProperty> >(
currentValueExpression,
updateParameter)
.Compile());
}
/// <summary> /// This API supports the Entity Framework Core infrastructure and is not intended to be used /// directly from your code. This API may change or be removed in future releases. /// </summary> protected override int GetPropertyIndex(IPropertyBase propertyBase) => propertyBase.GetShadowIndex();
/// <summary> /// This API supports the Entity Framework Core infrastructure and is not intended to be used /// directly from your code. This API may change or be removed in future releases. /// </summary> protected override void WritePropertyValue(IPropertyBase propertyBase, object value) => _propertyValues[propertyBase.GetShadowIndex()] = value;
/// <summary> /// This API supports the Entity Framework Core infrastructure and is not intended to be used /// directly from your code. This API may change or be removed in future releases. /// </summary> protected override object ReadPropertyValue(IPropertyBase propertyBase) => _propertyValues[propertyBase.GetShadowIndex()];
private static Func <InternalEntityEntry, TProperty> CreateCurrentValueGetter <TProperty>(
IPropertyBase propertyBase, bool useStoreGeneratedValues)
{
var entityClrType = propertyBase.DeclaringType.ClrType;
var entryParameter = Expression.Parameter(typeof(InternalEntityEntry), "entry");
var shadowIndex = propertyBase.GetShadowIndex();
Expression currentValueExpression;
if (shadowIndex >= 0)
{
currentValueExpression = Expression.Call(
entryParameter,
InternalEntityEntry.ReadShadowValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(shadowIndex));
}
else
{
var convertedExpression = Expression.Convert(
Expression.Property(entryParameter, "Entity"),
entityClrType);
currentValueExpression = CreateMemberAccess(
convertedExpression,
propertyBase.GetMemberInfo(forMaterialization: false, forSet: false));
if (currentValueExpression.Type != typeof(TProperty))
{
currentValueExpression = Expression.Convert(currentValueExpression, typeof(TProperty));
}
}
var storeGeneratedIndex = propertyBase.GetStoreGeneratedIndex();
if (storeGeneratedIndex >= 0)
{
if (useStoreGeneratedValues)
{
currentValueExpression = Expression.Condition(
Expression.Equal(
currentValueExpression,
Expression.Constant(default(TProperty), typeof(TProperty))),
Expression.Call(
entryParameter,
InternalEntityEntry.ReadStoreGeneratedValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(storeGeneratedIndex)),
currentValueExpression);
}
currentValueExpression = Expression.Condition(
Expression.Equal(
currentValueExpression,
Expression.Constant(default(TProperty), typeof(TProperty))),
Expression.Call(
entryParameter,
InternalEntityEntry.ReadTemporaryValueMethod.MakeGenericMethod(typeof(TProperty)),
Expression.Constant(storeGeneratedIndex)),
currentValueExpression);
}
return(Expression.Lambda <Func <InternalEntityEntry, TProperty> >(
currentValueExpression,
entryParameter)
.Compile());
Expression CreateMemberAccess(Expression parameter, MemberInfo memberInfo)
{
return(propertyBase?.IsIndexerProperty() == true
? Expression.MakeIndex(
parameter, (PropertyInfo)memberInfo, new List <Expression>() { Expression.Constant(propertyBase.Name) })
: (Expression)Expression.MakeMemberAccess(parameter, memberInfo));
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected override object ReadPropertyValue(IPropertyBase propertyBase)
=> !propertyBase.IsShadowProperty
? base.ReadPropertyValue(propertyBase)
: _shadowValues[propertyBase.GetShadowIndex()];
