具有运行时值的C＃统一容器构造函数注入

Question

I am using unity container XML config based constructor injection in my application. I need to pass some run-time values to the constructor. Is there any way to do that without doing it in code since I am using XML configs?

eg

 public Calculator(DateTime businessDate)
        {
            _businessDate = businessDate;
        }
//Calculator is instantiated using unity container and mapped in config file. 
//How to pass businessDate at run-time?

Thanks!!! in advance.

Answer 1

What you mean by XML configs ? If you are using app.config or web.config and your businessDate is stored in config file then you can use system.Configuration.ConfigurationManager class for that purpose.

<AppSetting>
<add key="businessDate" value="22/12/1786">
</AppSetting>

DateTime newdt = DateTime.ParseExact(ConfigurationManager.AppSetting["businessDate"], "dd/MM/yyyy", CultureInfo.InvariantCulture);
new Calculator(newdt);

EDIT: per your comment, you can resolve this by registering the type

// Register type
DateTime newdt = DateTime.ParseExact(ConfigurationManager.AppSetting["businessDate"], "dd/MM/yyyy", CultureInfo.InvariantCulture);

YourContainer.RegisterInstance<DateTime>("newdt", newdt); 


YourContainer.RegisterType<Calculator>(new InjectionConstructor(YourContainer.Resolve<DateTime>("newdt")));