public static Expression CreateExpression(IContainerContext containerContext, ResolutionConstructor resolutionConstructor, ResolutionInfo resolutionInfo,
Expression resolutionInfoExpression, ResolutionMember[] members = null)
{
var length = resolutionConstructor.Parameters.Length;
var arguments = new Expression[length];
for (var i = 0; i < length; i++)
{
var parameter = resolutionConstructor.Parameters[i];
arguments[i] = containerContext.ResolutionStrategy.GetExpressionForResolutionTarget(parameter, resolutionInfo, resolutionInfoExpression);
}
var newExpression = Expression.New(resolutionConstructor.Constructor, arguments);
if (members == null || members.Length == 0) return newExpression;
{
var propLength = members.Length;
var propertyExpressions = new MemberBinding[propLength];
for (var i = 0; i < propLength; i++)
{
var member = members[i];
var propertyExpression = Expression.Bind(member.MemberInfo,
containerContext.ResolutionStrategy.GetExpressionForResolutionTarget(member.ResolutionTarget, resolutionInfo, resolutionInfoExpression));
propertyExpressions[i] = propertyExpression;
}
return Expression.MemberInit(newExpression, propertyExpressions);
}
}
public static CreateInstance CreateConstructorExpression(IContainerContext containerContext, ResolutionConstructor resolutionConstructor,
ResolutionMember[] members = null)
{
var strategyParameter = Expression.Constant(containerContext.ResolutionStrategy, typeof(IResolutionStrategy));
var resolutionInfoParameter = Expression.Parameter(typeof(ResolutionInfo), "resolutionInfo");
var arguments = CreateExpressionFromResolutionTargets(resolutionConstructor.Parameters, strategyParameter, resolutionInfoParameter);
var newExpression = Expression.New(resolutionConstructor.Constructor, arguments);
if (members == null || members.Length == 0)
return Expression.Lambda<CreateInstance>(newExpression, resolutionInfoParameter).Compile();
var length = members.Length;
var propertyExpressions = new MemberBinding[length];
for (var i = 0; i < length; i++)
{
var member = members[i];
var propertyExpression = Expression.Bind(member.MemberInfo,
CreateResolutionTargetExpression(member.ResolutionTarget, strategyParameter,
resolutionInfoParameter));
propertyExpressions[i] = propertyExpression;
}
var initExpression = Expression.MemberInit(newExpression, propertyExpressions);
return Expression.Lambda<CreateInstance>(initExpression, resolutionInfoParameter).Compile();
}
public object BuildInstance(ResolutionInfo resolutionInfo, TypeInformation resolveType)
{
if (this.metaInfoProvider.HasInjectionMethod || this.containerExtensionManager.HasPostBuildExtensions)
{
if (this.constructorDelegate != null && !this.isConstructorDirty) return this.ResolveType(containerContext, resolutionInfo, resolveType);
lock (this.syncObject)
{
if (this.constructorDelegate != null && !this.isConstructorDirty) return this.ResolveType(containerContext, resolutionInfo, resolveType);
ResolutionConstructor constructor;
if (!this.metaInfoProvider.TryChooseConstructor(out constructor, resolutionInfo,
this.injectionParameters))
throw new ResolutionFailedException(this.metaInfoProvider.TypeTo.FullName);
this.constructorDelegate = ExpressionDelegateFactory.CreateConstructorExpression(this.containerContext, constructor, this.GetResolutionMembers());
this.resolutionConstructor = constructor;
this.isConstructorDirty = false;
return this.ResolveType(containerContext, resolutionInfo, resolveType);
}
}
if (this.createDelegate != null && !this.isConstructorDirty) return this.createDelegate(resolutionInfo);
this.createDelegate = this.containerContext.DelegateRepository.GetOrAdd(this.registrationName, () =>
{
ResolutionConstructor constructor;
if (!this.metaInfoProvider.TryChooseConstructor(out constructor, resolutionInfo,
this.injectionParameters))
throw new ResolutionFailedException(this.metaInfoProvider.TypeTo.FullName);
var parameter = Expression.Parameter(typeof(ResolutionInfo));
this.createDelegate = Expression.Lambda<Func<ResolutionInfo, object>>(this.GetExpressionInternal(constructor, resolutionInfo, parameter), parameter).Compile();
this.resolutionConstructor = constructor;
this.isConstructorDirty = false;
return this.createDelegate;
}, this.isConstructorDirty);
return this.createDelegate(resolutionInfo);
}
public bool TryChooseConstructor(out ResolutionConstructor resolutionConstructor, ResolutionInfo resolutionInfo, InjectionParameter[] injectionParameters = null)
{
return this.TryGetBestConstructor(out resolutionConstructor, resolutionInfo, injectionParameters);
}
private bool TryGetConstructor(IEnumerable<ConstructorInformation> constructors, out ResolutionConstructor resolutionConstructor,
ResolutionInfo resolutionInfo, InjectionParameter[] injectionParameters = null)
{
var usableConstructors = this.GetUsableConstructors(constructors, resolutionInfo, injectionParameters).ToArray();
if (usableConstructors.Any())
{
resolutionConstructor = this.CreateResolutionConstructor(this.SelectBestConstructor(usableConstructors), injectionParameters);
return true;
}
resolutionConstructor = null;
return false;
}
private bool TryGetBestConstructor(out ResolutionConstructor resolutionConstructor, ResolutionInfo resolutionInfo,
InjectionParameter[] injectionParameters = null)
{
return this.TryGetConstructor(this.metaInfoCache.Constructors.Where(constructor => constructor.HasInjectionAttribute), out resolutionConstructor, resolutionInfo, injectionParameters) ||
this.TryGetConstructor(this.metaInfoCache.Constructors.Where(constructor => !constructor.HasInjectionAttribute), out resolutionConstructor, resolutionInfo, injectionParameters);
}
private Expression GetExpressionInternal(ResolutionConstructor constructor, ResolutionInfo resolutionInfo, Expression resolutionInfoExpression)
{
return ExpressionDelegateFactory.CreateExpression(this.containerContext, constructor, resolutionInfo, resolutionInfoExpression, this.GetResolutionMembers());
}
public Expression GetExpression(ResolutionInfo resolutionInfo, Expression resolutionInfoExpression, TypeInformation resolveType)
{
if (this.resolutionConstructor != null && !this.isConstructorDirty) return this.GetExpressionInternal(this.resolutionConstructor, resolutionInfo, resolutionInfoExpression);
{
lock (this.syncObject)
{
if (this.resolutionConstructor != null && !this.isConstructorDirty) return this.GetExpressionInternal(this.resolutionConstructor, resolutionInfo, resolutionInfoExpression);
{
ResolutionConstructor constructor;
if (!this.metaInfoProvider.TryChooseConstructor(out constructor, injectionParameters: this.injectionParameters))
throw new ResolutionFailedException(this.metaInfoProvider.TypeTo.FullName);
this.resolutionConstructor = constructor;
this.isConstructorDirty = false;
return this.GetExpressionInternal(constructor, resolutionInfo, resolutionInfoExpression);
}
}
}
}
