/// <summary>
/// Applies null check and disposal scope tracking logic to an expression
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="expression"></param>
/// <param name="allowDisposableTracking"></param>
/// <returns></returns>
public static Expression ApplyNullCheckAndAddDisposal(IInjectionScope scope, IActivationExpressionRequest request, Expression expression, bool allowDisposableTracking)
{
if (expression.Type != request.ActivationType &&
!ReflectionService.CheckTypeIsBasedOnAnotherType(expression.Type, request.ActivationType))
{
expression = Expression.Convert(expression, request.ActivationType);
}
if (!allowDisposableTracking)
{
if (request.DefaultValue != null)
{
var method = typeof(ExpressionUtilities).GetRuntimeMethods()
.FirstOrDefault(m => m.Name == "ValueOrDefault");
var closedMethod = method.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, expression, Expression.Constant(request.DefaultValue.DefaultValue, request.ActivationType)));
}
if (!scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull &&
request.IsRequired)
{
var closedMethod = CheckForNullMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
Expression.Constant(request.GetStaticInjectionContext()),
expression));
}
return(expression);
}
if (request.DefaultValue != null)
{
var method = typeof(ExpressionUtilities).GetRuntimeMethods()
.FirstOrDefault(m => m.Name == "AddToDisposableScopeOrDefault");
var closedMethod = method.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, request.DisposalScopeExpression, expression, Expression.Constant(request.DefaultValue.DefaultValue, request.ActivationType)));
}
if (scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull ||
!request.IsRequired)
{
var closedMethod = AddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, request.DisposalScopeExpression, expression));
}
else
{
var closedMethod = CheckForNullAndAddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
request.DisposalScopeExpression,
Expression.Constant(request.GetStaticInjectionContext()), expression));
}
}
/// <summary>
/// Applies null check and disposal scope tracking logic to an expression
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="expression"></param>
/// <param name="allowDisposableTracking"></param>
/// <returns></returns>
public static Expression ApplyNullCheckAndAddDisposal(IInjectionScope scope, IActivationExpressionRequest request, Expression expression, bool allowDisposableTracking)
{
if (expression.Type != request.ActivationType &&
!ReflectionService.CheckTypeIsBasedOnAnotherType(expression.Type, request.ActivationType))
{
expression = Expression.Convert(expression, request.ActivationType);
}
if (!allowDisposableTracking)
{
if (!scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull)
{
var closedMethod = CheckForNullMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
Expression.Constant(request.GetStaticInjectionContext()),
expression));
}
}
else
{
if (scope.ScopeConfiguration.Behaviors.AllowInstanceAndFactoryToReturnNull)
{
var closedMethod = AddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod, request.DisposalScopeExpression, expression));
}
else
{
var closedMethod =
CheckForNullAndAddToDisposalScopeMethodInfo.MakeGenericMethod(request.ActivationType);
return(Expression.Call(closedMethod,
request.DisposalScopeExpression,
Expression.Constant(request.GetStaticInjectionContext()), expression));
}
}
return(expression);
}