reflection

问题 var a = new obj(); var property = a.GetType().GetProperty("DB").GetValue(a,null) as testObject; does this mean that the variable property hold a reference to the the same object that i got in object a , or a new testObject was made that holds the same values? if this means creating a new object, then how can i get the reference to that property/backing field using reflection? 回答1: property now holds a referece to whatever is in a 's DB property. I'm not sure though what happens when you call

问题 I imagine everyone has seen code like: public void Server2ClientEnumConvert( ServerEnum server) { switch(server) { case ServerEnum.One: return ClientEnum.ABC //And so on. Instead of this badness we could do somthing like: public enum ServerEnum { [Enum2Enum(ClientEnum.ABC)] One, } Now we can use reflection to rip through ServerEnum and get the conversion mappings from the enum declaration itself. The problem I am having here is in the declaration of the Enum2Enum attribute. This works but

问题 Is there a way to dynamically instantiate a Scala case class having one or more default parameters specified? I'm looking for the dynamic (reflection-based) equivalent of this: case class Foo( name:String, age:Int = 21 ) val z = Foo("John") Right now if I try this I get an exception: val const = Class.forName("Foo").getConstructors()(0) val args = Array("John").asInstanceOf[Array[AnyRef]] const.newInstance(args:_*) If I add a value for age in my parameter array, no problem. 回答1: Argument with

问题 Is there a way to dynamically instantiate a Scala case class having one or more default parameters specified? I'm looking for the dynamic (reflection-based) equivalent of this: case class Foo( name:String, age:Int = 21 ) val z = Foo("John") Right now if I try this I get an exception: val const = Class.forName("Foo").getConstructors()(0) val args = Array("John").asInstanceOf[Array[AnyRef]] const.newInstance(args:_*) If I add a value for age in my parameter array, no problem. 回答1: Argument with

问题 I'm just trying make the same expression like below using Linq.Expression: Expression<Func<Organization, bool>> expression = @org => @org.OrganizationFields.Any(a => a.CustomField.Name == field.Name && values.Contains(a.Value)); In this example above I have an entity called Organization and it has a property called OrganizationsFields as IEnumerable and I want to find any occurrence that match with Any parameter expression. I just using the code below to generate expression dynamically:

问题 I have a code which is similar to the following package main import "fmt" func PrintThis(arg string) { fmt.Printf("I'm printing %s", arg) } func PrintThisAndThat(arg1, arg2 string) { fmt.Printf("Now printing %s and %s", arg1, arg2) } func Invoke(fn interface{}, args ...string) { //fn(args...) } func main() { Invoke(PrintThis, "foo") Invoke(PrintThisAndThat, "foo", "bar") } This is not the actual production code, but this is a simplified version. Question :- If I uncomment the line //fn(args..

问题 I have come across something pretty complex. I would be obliged if anyone can help. 1) I have to create a List<> of unknown type at compile time. That I have already achieved. Type customList = typeof(List<>).MakeGenericType(tempType); object objectList = (List<object>)Activator.CreateInstance(customList); "temptype" is the custom type thats been already fetched. 2) Now I have PropertyInfo object which is that list from which I have to copy all items to the the instance that I have just

问题 I have come across something pretty complex. I would be obliged if anyone can help. 1) I have to create a List<> of unknown type at compile time. That I have already achieved. Type customList = typeof(List<>).MakeGenericType(tempType); object objectList = (List<object>)Activator.CreateInstance(customList); "temptype" is the custom type thats been already fetched. 2) Now I have PropertyInfo object which is that list from which I have to copy all items to the the instance that I have just

问题 I have a collection of object in lst of type DataResponse and what I would like to do is sum up all the properties that are int and decimal of this collection and assign the result of each property to another object DataContainerResponse that has the same exact property names(and types) as the those that are being summed up. I can do this manually by typing out each property by hand and do a .Sum(s=>s.<propertyname> . But that so 90s. Below is my fruitless attempt to juice it out. Frankly, I

问题 I have a collection of object in lst of type DataResponse and what I would like to do is sum up all the properties that are int and decimal of this collection and assign the result of each property to another object DataContainerResponse that has the same exact property names(and types) as the those that are being summed up. I can do this manually by typing out each property by hand and do a .Sum(s=>s.<propertyname> . But that so 90s. Below is my fruitless attempt to juice it out. Frankly, I