Unity容器在解析打开的泛型类型时引发ResolutionFailedException
本文关键字:泛型类型 ResolutionFailedException Unity | 更新日期: 2023-09-27 18:20:04
我正在使用Unity2.0,并尝试解析一个开放的泛型类型。类别定义如下:
public interface IRepository<T>
{
void Add(T t);
void Delete(T t);
void Save();
}
public class SQLRepository<T> : IRepository<T>
{
#region IRepository<T> Members
public void Add(T t)
{
Console.WriteLine("SQLRepository.Add()");
}
public void Delete(T t)
{
Console.WriteLine("SQLRepository.Delete()");
}
public void Save()
{
Console.WriteLine("SQLRepository.Save()");
}
#endregion
}
配置文件如下:
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<namespace name="UnityTry"/>
<assembly name="UnityTry"/>
<container>
<register type="IRepository[]" mapTo="SQLRepository[]" name="SQLRepo" />
</container>
</unity>
解析IRepository的代码:
IUnityContainer container = new UnityContainer();
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Containers.Default.Configure(container);
IRepository<string> rep = container.Resolve<IRepository<string>>();
rep.Add("World");
当我运行代码时,ResolutionFailedException将在第行引发:
IRepository<string> rep = container.Resolve<IRepository<string>>();
异常消息为:
Exception is: InvalidOperationException - The current type, UnityTry.IRepository`1 [System.String], is an interface and cannot be constructed. Are you missing a type mapping?
有人知道我做错了什么吗?
打开的泛型使用名称"SQLRepo"向映射注册,但解析后不会提供名称,因此Unity无法找到映射。尝试按名称解析:
IRepository<string> rep = container.Resolve<IRepository<string>>("SQLRepo");