Assembly assembly1 = Assembly.Load("SqlServerDB");//方式一：這個DLL文件要在啟動項目下
string filePath = Environment.CurrentDirectory + "";
Assembly assembly2 = Assembly.LoadFile(filePath + @"\SqlServerDB.dll");//方式二：完整路徑
Assembly assembly3 = Assembly.LoadFrom(filePath + @"\SqlServerDB.dll");//方式三：完整路徑
Assembly assembly4 = Assembly.LoadFrom(@"SqlServerDB.dll");//方式三：完整路徑

foreach (var item in assembly4.GetTypes())//查找所有的類型,就是有多少個類
{
    Console.WriteLine(item.Name);
}

Type type = assembly4.GetType("SqlServerDB.ReflectionTest");//在ReflectionTest類中調用
foreach (var ctor in type.GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public))
{
    Console.WriteLine($"構造方法：{ctor.Name}");
    foreach (var param in ctor.GetParameters())
    {
        Console.WriteLine($"構造方法的參數：{param.ParameterType}");
    }
}
//【3】實例化
//ReflectionTest reflectionTest = new ReflectionTest();//這種實例化是知道具體類型--靜態

//object objTest = Activator.CreateInstance(type);//動態實例化--調用我們的構造方法
object objTest1 = Activator.CreateInstance(type, new object[] { "string" });//動態實例化--調用我們的有參數構造方法

//調用私有構造函數
//ReflectionTest reflectionTest = new ReflectionTest();  //普通調用
object objTest2 = Activator.CreateInstance(type, true);

object objTest2 = Activator.CreateInstance(type, true);
//調用普通方法
ReflectionTest reflectionTest = objTest2 as ReflectionTest;//as轉換的好處，它不報錯，類型不對的話就返回null
reflectionTest.Show1();

//調用私有方法
var method = type.GetMethod("Show2", BindingFlags.Instance | BindingFlags.NonPublic);
method.Invoke(objTest2, new object[] { });

//泛型無參數
var method3 = type.GetMethod("Show3");//查找指定方法
var genericMethod = method3.MakeGenericMethod(new Type[] { typeof(int) });//指定泛型參數類型T
genericMethod.Invoke(objTest2, new object[] { });

//泛型有參數
var method4 = type.GetMethod("Show4");//查找指定方法
var genericMethod4 = method4.MakeGenericMethod(new Type[] { typeof(string) });//指定泛型參數類型T
genericMethod4.Invoke(objTest2, new object[] { 123, "泛型string參數" });

    /// <summary>
    /// 反射測試類
    /// </summary>
   public class ReflectionTest
    {
        //私有構造函數
        private ReflectionTest()
        {
            Console.WriteLine("這是私有無參數構造方法");
        }

        //普通構造函數
        //public ReflectionTest()
        //{
        //    Console.WriteLine("這是無參數構造方法");
        //}

        public ReflectionTest(string name)
        {
            Console.WriteLine($"這是有參數構造方法+參數值是：{name}");
        }

        public void Show1()
        {
            Console.WriteLine("調用普通方法", this.GetType());
        }

        private void Show2()
        {
            Console.WriteLine("調用私有方法",this.GetType());
        }


        public void Show3<T>()
        {
            Console.WriteLine("調用無參數泛型方法", this.GetType());
        }

        public void Show4<T>(int id,string name)
        {
            Console.WriteLine($"調用有參數泛型方法，參數是{id}，{name}", this.GetType());
        }
    }

Assembly assembly = Assembly.LoadFrom(@"SqlServerDB.dll");

Type type = assembly.GetType("SqlServerDB.GenericClass`2").MakeGenericType(typeof(int), typeof(string));//一定給定具體類型參數

object objTest2 = Activator.CreateInstance(type);
var method = type.GetMethod("GenericMethod").MakeGenericMethod(typeof(int));
method.Invoke(objTest2, new object[] { });

public class GenericClass<T,W>
{
    public void GenericMethod<TType>()
    {
        Console.WriteLine("泛型類調用+泛型方法");
    }
}

Assembly assembly2 = Assembly.LoadFrom("SqlServerDB.dll");

Type type2 = assembly2.GetType("SqlServerDB.PropertyClass");

object obj = Activator.CreateInstance(type2);
foreach (var property in type2.GetProperties())
{
    Console.WriteLine(property.Name);
    //給屬性設置值
    if (property.Name.Equals("Id"))
    {
        property.SetValue(obj, 1);
    }
    else if (property.Name.Equals("Name"))
    {
        property.SetValue(obj, "學習編程");
    }
    else if (property.Name.Equals("Phone"))
    {
        property.SetValue(obj, "123459789");
    }
    //獲取屬性值
    Console.WriteLine(property.GetValue(obj));
}

public class PropertyClass
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Phone { get; set; }
}