/// <inheritdoc />
public bool TryBuildExpression(IBuildContext buildContext, ILifetime lifetime, out Expression expression, out Exception error)
{
if (buildContext == null)
{
throw new ArgumentNullException(nameof(buildContext));
}
try
{
var autoWiringStrategy = _autowiringStrategy ?? buildContext.AutowiringStrategy;
var typeDescriptor = _createInstanceExpression.Type.Descriptor();
expression = ReplaceTypes(buildContext, _createInstanceExpression, _typesMap);
var thisVar = Expression.Variable(expression.Type);
var initializeExpressions =
GetInitializers(buildContext.Container, autoWiringStrategy, typeDescriptor)
.Select(initializer => (Expression)Expression.Call(thisVar, initializer.Info, initializer.GetParametersExpressions(buildContext)))
.Concat(_initializeInstanceExpressions.Select(statementExpression => ReplaceTypes(buildContext, statementExpression, _typesMap)))
.ToArray();
if (initializeExpressions.Length > 0)
{
expression = Expression.Block(
new[] { thisVar },
Expression.Assign(thisVar, expression),
Expression.Block(initializeExpressions),
thisVar
);
}
var visitor = new DependencyInjectionExpressionVisitor(buildContext, thisVar);
expression = visitor.Visit(expression) ?? expression;
expression = buildContext.FinalizeExpression(expression, lifetime);
error = default(Exception);
return(true);
}
catch (BuildExpressionException ex)
{
error = ex;
expression = default(Expression);
return(false);
}
}
