.net C# 反射技术使用例子

获得实例的方法
1.获得同一程序集内的类型的实例。 

无参数构造函数
Type t = Type.GetType("AppCode.Employe");

if (t == null)
{
textBox1.Text = "Create Type Error";
return;
}

object emp = t.Assembly.CreateInstance("AppCode.Employe");

if (emp == null)
{
textBox1.Text = "Create Instance Error";
return;
}

StringBuilder sb = new StringBuilder();
sb.AppendLine("Type:" + t.FullName);
sb.AppendLine("Context:");
sb.AppendLine(emp.ToString());

textBox1.Text = sb.ToString();
 

有参数构造函数
Type t = Type.GetType("AppCode.Employe");

if (t == null)
{
textBox1.Text = "Create Type Error";
return;
}

//构造函数参数列表如下
//public Employe(string userid, string username, int age)

//生成参数类型数组
Type ts = new Type { typeof(System.String),typeof(System.String), typeof(System.Int16) };

//获得构造函数
ConstructorInfo mi = t.GetConstructor(ts);

if (mi == null)
{
textBox1.Text = "Create ConstructorInfo Error";
return;
}

//生成参数值数组
object ps=new object;
ps[0] = "420106780911326";
ps = "wesker";
ps = 36;

object emp=mi.Invoke(ps);

StringBuilder sb = new StringBuilder();
sb.AppendLine("Type:" + t.FullName);
sb.AppendLine("Context:");
sb.AppendLine(emp.ToString());

textBox1.Text = sb.ToString();
2.获得不同程序集内的类型的实例。
比如当前窗体程序要通过反射获得一个名为"compenent1"（文件名为compenent1.dll）的程序集中的类型的实例。

无参数构造函数
Type t = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "\\compenent1.dll").
GetType("compenent1.User");

if (t == null)
{
textBox1.Text = "Create Type Error";
return;
}

object user = t.Assembly.CreateInstance("compenent1.User");

if (user == null)
{
textBox1.Text = "Create Instance Error";
return;
}

StringBuilder sb = new StringBuilder();
sb.AppendLine("Type:" + t.FullName);
sb.AppendLine("Context:");
sb.AppendLine(user.ToString());

textBox1.Text = sb.ToString();
 

有参数的构造函数
Type t = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "\\compenent1.dll").
GetType("compenent1.User");

if (t == null)
{
textBox1.Text = "Create Type Error";
return;
}

//构造函数参数列表如下
//public Employe(string userid, string username, int age)

Type ts = new Type { typeof(System.String), typeof(System.String), typeof(System.Int16) };

ConstructorInfo mi = t.GetConstructor(ts);

if (mi == null)
{
textBox1.Text = "Create ConstructorInfo Error";
return;
}

object ps = new object;
ps[0] = "420106780911326";
ps = "wesker";
ps = 36;

object user = mi.Invoke(ps);

StringBuilder sb = new StringBuilder();
sb.AppendLine("Type:" + t.FullName);
sb.AppendLine("Context:");
sb.AppendLine(user.ToString());

textBox1.Text = sb.ToString();
3.使用反射调用方法

Type t = Type.GetType("AppCode.Employe");

if (t == null)
{
textBox1.Text = "Create Type Error";
return;
}

object emp = t.Assembly.CreateInstance("AppCode.Employe");

if (em