Question

public class Account
{
}
public class SpecificationBase<T>
{
}
public class AccountSearch : SpecificationBase<Account>
{
}
public class SearchBase<T> where T : SpecificationBase<T>
{
}
public class Start
{
    public Start()
    {
        new SearchBase<AccountSearch>();
    }
}

错误：类型“AccountSearch”不能在通用类型或方法“T”中用作类型参数“SearchBase<T>”。没有从“AccountSearch”到“SpecificationBase<AccountSearch>”
的隐式引用转换

Answer 1

虽然其他答案事实上是正确的并且会使问题消失，但我认为您正在寻找的是以下内容：

public class Account
{
}
public class SpecificationBase<T>
{
}
public class AccountSearch : SpecificationBase<Account>
{
}
public class SearchBase<T, TModel> where T : SpecificationBase<TModel>
{
}
public class Start
{
    public Start()
    {
        new SearchBase<AccountSearch, Account>();
    }
}

Answer 2

错误是自我解释的。将限制更改为具体类型以执行有效转换：

public class Account
{
}
public class SpecificationBase<T>
{
}
public class AccountSearch : SpecificationBase<Account>
{
}
public class SearchBase<T> where T : SpecificationBase<Account>
{
}
public class Start
{
    public Start()
    {
        new SearchBase<AccountSearch>();
    }
}

}

不能在泛型类型或方法

2 个答案: