反射创建类实例

[皇姑雪糕]

我使用工厂模式创建了若干方法例如

public ClassFactory
{
public ReturnClass Create(ClassA a) {....}
public ReturnClass Create(ClassB b) {....}
}

我只有在运行时才能得到ClassA或者是ClassB的类名的字符串形式，现在我有如下代码

ClassFactory cf = new ClassFactory();
string paramName = GetParamName(); //paramName 就是“ClassA”或者“ClassB”

//.....这段不会写啊
//得到ClassA或ClassB的实例a

ReturnClass rc = cf.Create(a);

[qxyywy]

/// <summary>
    /// This class is implemented following the Abstract Factory pattern to create the BLL implementation
    /// specified from the configuration file
    /// </summary>
    public sealed class DataAccess
    {

        // Look up the BLL implementation we should be using
        private static readonly string path = "*****.BLL";
        private static readonly Assembly bllAssembly = null;

        static DataAccess()
        {
            bllAssembly = Assembly.Load(path);
        }

        private DataAccess() { }

        /// <summary>
        /// 创建业务逻辑对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static T GetBll<T>()
        {
            Type type = typeof(T);
            return (T)bllAssembly.CreateInstance(type.Namespace.Replace("IBLL", "BLL") + "." + type.Name.Substring(1));
        }
    }

[bdmh]

http://hi.baidu.com/%B3%BE%CA%C0%D2%BB%E5%D0%D2%A3/blog/item/fda82339878bfa3d97ddd8c0.html

[Caney]

object result = null;
Type type = Type.GetType(className);
result = Activator.CreateInstance(type);