c# 在运行时创建未知的泛型类型

因此，我有一个泛型类，它可能需要在其自己的方法内使用不同类型的泛型创建自身的实例，其类型是通过反射获得的。

这很重要，因为这个存储库映射T到数据库表 [这是我正在写的 ORMish] 并且如果代表的类T有一个代表另一个表的集合，我需要能够实例化它并将其传递到存储库 [ala Inception]。
我提供该方法是为了更容易发现问题。

private PropertiesAttributesAndRelatedClasses GetPropertyAndAttributesCollection() 
{
  // Returns a List of PropertyAndAttributes

  var type = typeof(T);
  //For type T return an array of PropertyInfo

  PropertiesAttributesAndRelatedClasses PAA = new PropertiesAttributesAndRelatedClasses();
  //Get our container ready

  //Let's loop through all the properties.
  PropertyAndAttributes _paa;
  foreach(PropertyInfo Property in type.GetProperties())
  {
    //Create a new instance each time.
    _paa = new PropertyAndAttributes();

    //Adds the property and generates an internal collection of attributes for it too
    _paa.AddProperty(Property);

    bool MapPropertyAndAttribute = true;
    //This is a class we need to map to another table
    if (Property.PropertyType.Namespace == "System.Collections.Generic")
    {
      PAA.AddRelatedClass(Property);
      //var x = Activator.CreateInstance("GenericRepository", Property.GetType().ToString());
    }
    else 
    {
      foreach(var attr in _paa.Attrs) 
      {
        if (attr is IgnoreProperty)
        {
          //If we find this attribute it is an override and we ignore this property.
          MapPropertyAndAttribute = false;
          break;
        }
      }
    }
    //Add this to the list.
    if (MapPropertyAndAttribute) PAA.AddPaa(_paa);
  }
  return PAA;
}

所以给出GenericRepository<T>，我想做一个GenericRepository<string type obtained via reflection from the Property>我该怎么做？ 我需要用有效的东西替换的行是：

//var x = Activator.CreateInstance("GenericRepository", Property.GetType().ToString());

Thanks.

我想你正在寻找MakeGenericType method:

// Assuming that Property.PropertyType is something like List<T>
Type elementType = Property.PropertyType.GetGenericArguments()[0];
Type repositoryType = typeof(GenericRepository<>).MakeGenericType(elementType);
var repository = Activator.CreateInstance(repositoryType);