c# - 动态确定不同类的函数返回类型？

Question

public <return_type> getclass(string company)
{
    switch (company)
    {
        case "cmp1": Classcmp1 temp = new Classcmp1(); return temp ;
        case "cmp2": Classcmp2 temp = new Classcmp2(); return temp ;
        case "cmp3": Classcmp3 temp = new Classcmp3(); return temp ; 
    }
}

如果classcmp1、classcmp2、classcmp3是三个public类，这个函数的返回类型应该是什么？如何动态确定？

Answer 1

你总是可以返回一个对象，因为所有的类都继承自对象:

public object getclass(string Company)
{
    switch (Company)
    {
        case "cmp1": classcmp1 temp = new classcmp1(); return temp ;
        case "cmp2": classcmp2 temp = new classcmp2(); return temp ;
        case "cmp3": classcmp3 temp = new classcmp3(); return temp ; 
    }
}

否则您可以构建一个类，您的三个类将从该类继承:

public class classcmp { }
public class classcmp1 : classcmp {}
public class classcmp2 : classcmp {}
public class classcmp3 : classcmp {}

public classcmp getclass(string Company)
{
    switch (Company)
    {
        case "cmp1": classcmp1 temp = new classcmp1(); return temp ;
        case "cmp2": classcmp2 temp = new classcmp2(); return temp ;
        case "cmp3": classcmp3 temp = new classcmp3(); return temp ; 
    }
}

否则，您可以构建一个界面:

public interface Iclasscmp { }
public class classcmp1 : Iclasscmp {}
public class classcmp2 : Iclasscmp {}
public class classcmp3 : Iclasscmp {}

public Iclasscmp getclass(string Company)
{
    switch (Company)
    {
        case "cmp1": classcmp1 temp = new classcmp1(); return temp ;
        case "cmp2": classcmp2 temp = new classcmp2(); return temp ;
        case "cmp3": classcmp3 temp = new classcmp3(); return temp ; 
    }
}

您所做的选择将影响程序的架构。由于没有更多关于您将需要的类的使用信息，因此很难为您提供更多帮助。