/// <summary>
/// Gets or sets the <see typeparamref="TFieldType"/> with the specified context.
/// </summary>
/// <value>
/// The <see typeparamref="TFieldType"/>.
/// </value>
/// <param name="context">The context.</param>
/// <returns></returns>
public TFieldType this[IAdviceContextTarget context]
{
get
{
var introducedField = GetIntroducedField(context.TargetType, context.TargetName);
return((TFieldType)introducedField.GetValue(context.Target));
}
set
{
var introducedField = GetIntroducedField(context.TargetType, context.TargetName);
introducedField.SetValue(context.Target, value);
}
}
/// <summary>
/// Gets the introduced field.
/// Since the attribute may be at assembly level, the advised type is given as parameter
/// A cache is kept, by target type.
/// </summary>
/// <param name="context">The context.</param>
/// <returns></returns>
protected FieldInfo GetIntroducedField(IAdviceContextTarget context)
{
var targetType = context.TargetType;
// this is where the advice is applied (method, property, event). For shared events this is instance-wide, so unrelated to any target
var targetName = IsShared ? null : context.TargetName;
var fieldInfos = GetIntroducedFieldsRegistry(context);
lock (fieldInfos)
{
//var key = Tuple.Create(targetType, targetName);
var key = new IntroducedFieldsRegistry.Key(_ownerAdvice.GetType(), _ownerMemberInfo, targetName);
if (fieldInfos.Fields.TryGetValue(key, out var introducedField))
{
return(introducedField);
}
fieldInfos.Fields[key] = introducedField = Invocation.FindIntroducedField(_ownerAdvice, _ownerMemberInfo, targetType, targetName);
return(introducedField);
}
}
/// <summary>
/// Gets the field infos registry. It is shared per instance because of shared introduced fields
/// </summary>
/// <param name="context">The context.</param>
/// <returns></returns>
#pragma warning disable 618
private IntroducedFieldsRegistry GetIntroducedFieldsRegistry(IAdviceContextTarget context)
{
var contextTargetType = context.TargetType;
var registryField = GetRegistryField(contextTargetType);
var registry = (IntroducedFieldsRegistry)registryField.GetValue(context.Target);
if (registry is null)
{
lock (FieldInfosLock)
{
registry = (IntroducedFieldsRegistry)registryField.GetValue(context.Target);
if (registry is null)
{
registry = new IntroducedFieldsRegistry();
registryField.SetValue(context.Target, registry);
}
}
}
return(registry);
}
