/// <summary>
/// Create call expression for delegate
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="activationConfiguration"></param>
/// <param name="activationDelegate"></param>
/// <returns></returns>
protected virtual IActivationExpressionResult CreateCallExpression(IInjectionScope scope, IActivationExpressionRequest request, TypeActivationConfiguration activationConfiguration, ActivationStrategyDelegate activationDelegate)
{
return(ExpressionUtilities.CreateExpressionForDelegate(activationDelegate, activationConfiguration.ExternallyOwned,
scope, request));
}
private Expression CreateLocateExpression(ParameterInfo parameter, IInjectionScope scope, IActivationExpressionRequest request, TypeActivationConfiguration activationConfiguration)
{
var parameterInfo = FindParameterInfoExpression(parameter, activationConfiguration);
if (parameterInfo?.ExportFunc is Delegate)
{
var newRequest = request.NewRequest(parameter.ParameterType, activationConfiguration.ActivationStrategy,
activationConfiguration.ActivationType, RequestType.ConstructorParameter, parameter, true);
var delegateValue = (Delegate)parameterInfo.ExportFunc;
var expressionCall = ExpressionUtilities.CreateExpressionForDelegate(delegateValue,
activationConfiguration.ExternallyOwned, scope, newRequest);
var standardParameters = delegateValue.GetMethodInfo()
.GetParameters()
.All(p =>
{
if (p.ParameterType == typeof(IExportLocatorScope))
{
return(true);
}
if (p.ParameterType == typeof(IDisposalScope))
{
return(true);
}
if (p.ParameterType == typeof(IInjectionContext))
{
return(true);
}
return(true);
});
if (standardParameters)
{
return(expressionCall.Expression);
}
newRequest = request.NewRequest(parameter.ParameterType, activationConfiguration.ActivationStrategy,
activationConfiguration.ActivationType, RequestType.ConstructorParameter, parameter, true);
var compiledDelegate = request.Services.Compiler.CompileDelegate(scope, expressionCall);
expressionCall =
ExpressionUtilities.CreateExpressionForDelegate(compiledDelegate, false, scope, newRequest);
return(expressionCall.Expression);
}
var closedMethod = DynamicLocateMethodInfo.MakeGenericMethod(parameter.ParameterType);
return(Expression.Call(Expression.Constant(this),
closedMethod,
request.Constants.ScopeParameter,
request.Constants.RootDisposalScope,
request.Constants.InjectionContextParameter,
Expression.Constant(parameter.Name.ToLowerInvariant()),
Expression.Constant(true),
Expression.Constant(false),
Expression.Default(parameter.ParameterType)));
}
