private Expression BuildParameter(IDependency parameterDependency, Type parameterType, Expression argument,
IDependencyScope scope)
{
if (parameterDependency == null) return Expression.Default(parameterType);
switch (parameterDependency.Lifetime)
{
case DependencyLifetime.Scoped:
case DependencyLifetime.Transient:
var dependencyConstant = Expression.Constant(parameterDependency);
// ReSharper disable AssignNullToNotNullAttribute
var getInstanceMethod = parameterDependency.GetType().GetMethod(nameof(IDependency.GetInstance));
var parameterInstanceCall = Expression.Call(
dependencyConstant, getInstanceMethod,
Expression.Constant(parameterType), argument);
// ReSharper restore AssignNullToNotNullAttribute
return Expression.Convert(parameterInstanceCall, parameterType);
case DependencyLifetime.Singleton:
var parameterConstant = parameterDependency.GetInstance(parameterType, scope);
return Expression.Constant(parameterConstant);
}
throw Error.InvalidDependencyLifetime();
}
private static Expression BuildParameter(
IDependency parameterDependency,
Type parameterType,
IServiceProvider services,
Expression servicesArgument)
{
if (parameterDependency.Lifetime == DependencyLifetime.Singleton)
{
var instance = parameterDependency.GetInstance(parameterType, services);
return(Expression.Constant(instance));
}
var dependency = Expression.Constant(parameterDependency);
var parameterCall = Expression.Call(dependency, GetInstanceMethod,
Expression.Constant(parameterType),
servicesArgument);
return(Expression.Convert(parameterCall, parameterType));
}