我面臨著一個(gè)場(chǎng)景，我需要?jiǎng)?chuàng)建N個(gè)對(duì)象的實(shí)例（實(shí)現(xiàn)一個(gè)接口）并從中調(diào)用一個(gè)方法，該方法的參數(shù)在實(shí)現(xiàn)該接口的每個(gè)類中可以有所不同，就像這樣：//Definitionclass BaseOutput{ public string Result {get; set;}}class BaseParam{ public string Name {get; set;}}class CarParam : BaseParam{ public string Wheels {get; set;}}class AirPlaneParam : BaseParam{ public string Engines {get; set;}}interface Vehicle{ IEnumerable<BaseOutput> Run(IEnumerable<BaseParam> parameters, object anotherVal);}//Implementationclass Car : Vehicle{ //Here the parameters type must be restricted to be only of type IEnumerable<CarParam> public IEnumerable<BaseOutput> Run(IEnumerable<BaseParam> parameters, object anotherVal) { //Do something specific to the Car }}class AirPlane : Vehicle{ //Here the parameters type must be restricted to be only of type IEnumerable<AirPlaneParam> public IEnumerable<BaseOutput> Run(IEnumerable<BaseParam> parameters, object anotherVal) { //Do something specific to the AirPlane }}需要該限制來防止在每個(gè)類的特定屬性的具體使用上出現(xiàn)任何問題。
2 回答
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TA貢獻(xiàn)1829條經(jīng)驗(yàn) 獲得超6個(gè)贊
您可以使參數(shù)類型為generic。
interface Vehicle<in TParam> where TParam : BaseParam
{
IEnumerable<BaseOutput> Run(IEnumerable<TParam> parameters,
object anotherVal);
}
//Implementation
class Car : Vehicle<CarParam>
{
public IEnumerable<BaseOutput> Run(IEnumerable<CarParam> parameters, object anotherVal)
{
//Do something specific to the Car
}
}
class AirPlane : Vehicle<AirPlaneParam>
{
public IEnumerable<BaseOutput> Run(IEnumerable<AirPlaneParam> parameters, object anotherVal)
{
//Do something specific to the AirPlane
}
}
這將限制您可以傳遞的內(nèi)容：
new Car().Run(new CarParam[0], new object()); // allowed
new Car().Run(new BaseParam[0], new object()); // compile-time error
new Car().Run(new AirPlaneParam[0], new object()); // compile-time error
您會(huì)發(fā)現(xiàn)困難的地方是，您是否需要在不知道其通用類型的情況下代表一堆車輛：
var vehicles = new List<Vehicle<BaseParam>>();
vehicles.Add(new Car()); // compile-time exception.
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