C# 从泛型超类定义获取正确的子类方法
如何在多个子类中实现在超类中定义的泛型方法? 我需要根据调用子类实例的类型确定正确的子类方法:C# 从泛型超类定义获取正确的子类方法,c#,generics,inheritance,C#,Generics,Inheritance,如何在多个子类中实现在超类中定义的泛型方法? 我需要根据调用子类实例的类型确定正确的子类方法: var someClassObj = new SubClass(); var = someClassObj.BuildList(v1, v2); public abstract class SomeBase { public List<T> BuildList<T>(int v1, int v2) { var results = new Lis
var someClassObj = new SubClass();
var = someClassObj.BuildList(v1, v2);
public abstract class SomeBase
{
public List<T> BuildList<T>(int v1, int v2)
{
var results = new List<T>();
for (int i = v1; i < v2; i++)
{
results.Add(AddItem<T>());
}
return results;
}
protected abstract T AddItem<T>();
}
public class SubClass : SomeBase
{
protected override BusinessThing AddItem<T>()
{
var entity = new BusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return entity;
}
}
public class BusinessThing
{
public string Name1 { get; set; }
public string Name2 { get; set; }
public string Name3 { get; set; }
}
var someClassObj=新的子类();
var=someClassObj.BuildList(v1,v2);
公共抽象类库
{
公共列表构建列表(intv1,intv2)
{
var results=新列表();
对于(int i=v1;i
上述未生成:重写方法“T SomeBase.AddItem()”时无法更改返回类型。您将使基类成为泛型而不是其方法:
public abstract class SomeBase<T>
{
public List<T> BuildList(int v1, int v2)
{
var results = new List<T>();
for (int i = v1; i < v2; i++)
{
results.Add(AddItem());
}
return results;
}
protected abstract T AddItem();
}
public class SubClass : SomeBase<BusinessThing>
{
protected override BusinessThing AddItem()
{
var entity = new BusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return entity;
}
}
公共抽象类SomeBase
{
公共列表构建列表(intv1,intv2)
{
var results=新列表();
对于(int i=v1;i
您可以将基类设置为泛型,而不是其方法:
public abstract class SomeBase<T>
{
public List<T> BuildList(int v1, int v2)
{
var results = new List<T>();
for (int i = v1; i < v2; i++)
{
results.Add(AddItem());
}
return results;
}
protected abstract T AddItem();
}
public class SubClass : SomeBase<BusinessThing>
{
protected override BusinessThing AddItem()
{
var entity = new BusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return entity;
}
}
公共抽象类SomeBase
{
公共列表构建列表(intv1,intv2)
{
var results=新列表();
对于(int i=v1;i
如果您不想像Daniel建议的那样拥有泛型类,您还可以告诉编译器t在使用where
子句限制泛型类型:
public abstract class SomeBase
{
public List<T> BuildList<T>(int v1, int v2) where T: BusinessThing
{
var results = new List<T>();
for (int i = v1; i < v2; i++)
{
results.Add(AddItem<T>());
}
return results;
}
protected abstract T AddItem<T>() where T:BusinessThing;
}
public class SubClass : SomeBase
{
protected override T AddItem<T>()
{
var entity = new BusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return (T)entity;
}
}
公共抽象类SomeBase
{
公共列表构建列表(intv1,intv2),其中T:BusinessThing
{
var results=新列表();
对于(int i=v1;i
然后按如下方式使用:
var someClassObj = new SubClass();
var list = someClassObj.BuildList<BusinessThing>(5, 7);
var someClassObj=新的子类();
var list=someClassObj.BuildList(5,7);
这还允许您使用派生的ConcreteBusinessThing类,该类派生自BusinessThing,该类还应使用:
public class SubClass : SomeBase
{
protected override T AddItem<T>()
{
var entity = new ConcreteBusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return (T)(object)entity; // ugly cast but is always ok
}
}
公共类子类:SomeBase
{
受保护的覆盖T AddItem()
{
var entity=new-ConcreteBusinessThing();
entity.Name1=“1”;
entity.Name2=“2”;
entity.Name3=“3”;
return(T)(object)entity;//难看的cast,但总是ok
}
}
并称之为:
var someClassObj = new SubClass();
var list = someClassObj.BuildList<ConcreteBusinessThing>(5, 7);
var someClassObj=新的子类();
var list=someClassObj.BuildList(5,7);
如果您不想像Daniel建议的那样拥有泛型类,您还可以告诉编译器t在使用where
子句限制泛型类型:
public abstract class SomeBase
{
public List<T> BuildList<T>(int v1, int v2) where T: BusinessThing
{
var results = new List<T>();
for (int i = v1; i < v2; i++)
{
results.Add(AddItem<T>());
}
return results;
}
protected abstract T AddItem<T>() where T:BusinessThing;
}
public class SubClass : SomeBase
{
protected override T AddItem<T>()
{
var entity = new BusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return (T)entity;
}
}
公共抽象类SomeBase
{
公共列表构建列表(intv1,intv2),其中T:BusinessThing
{
var results=新列表();
对于(int i=v1;i
然后按如下方式使用:
var someClassObj = new SubClass();
var list = someClassObj.BuildList<BusinessThing>(5, 7);
var someClassObj=新的子类();
var list=someClassObj.BuildList(5,7);
这还允许您使用派生的ConcreteBusinessThing类,该类派生自BusinessThing,该类还应使用:
public class SubClass : SomeBase
{
protected override T AddItem<T>()
{
var entity = new ConcreteBusinessThing();
entity.Name1 = "1";
entity.Name2 = "2";
entity.Name3 = "3";
return (T)(object)entity; // ugly cast but is always ok
}
}
公共类子类:SomeBase
{
受保护的覆盖T AddItem()
{
var entity=new-ConcreteBusinessThing();
entity.Name1=“1”;
entity.Name2=“2”;
entity.Name3=“3”;
return(T)(object)entity;//难看的cast,但总是ok
}
}
并称之为:
var someClassObj = new SubClass();
var list = someClassObj.BuildList<ConcreteBusinessThing>(5, 7);
var someClassObj=新的子类();
var list=someClassObj.BuildList(5,7);
您是否尝试过ClassObj.BuildList(v1,v2);?您是否尝试过ClassObj.BuildList(v1,v2);?