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CSharp Type 类型反射调用

引子

Type 关键字

CSharp 中所有的类型都是 Type

获取 Type 的方法有三种

  1. 使用 typeof 运算符
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Type t = typeof(int);
  1. 使用 getType() 方法
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int i;
Type t = i.GetType();
  1. 使用Type类的静态方法 GetType()
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Type t =Type.GetType("System.Double");

Type的属性

属性名 属性含义 扩展
Name 类型名 MyTestType
FullName 类型的完全限定名,包括命名空间 ConsoleApp1.MyTestType
Namespace 类型的命名空间 ConsoleApp1
BaseType 直接父类类型 ConsoleApp1.MyTestParent
UnderlyingSystemType 映射类型 ConsoleApp1.MyTestType

Type的主要方法

方法名 方法含义 入口参数 返回值 扩展
GetFields 获取所有公共字段。 - FieldInfo[] public int Size;
GetField 此方法用于搜索具有指定名称的公共字段。 string FieldInfo -
GetProperties 获取所有公共属性 (get/set) - PropertyInfo[] public int Pos { get; set; }
GetPropertie 此方法用于搜索具有指定名称的公共属性 (get/set) string PropertyInfo -
GetMethods 获取所有公共方法[包含(get/set)] - MethodInfo[] 包含Get/Set方法 如 get_Pos/set_Pos
GetMethod 此方法用于搜索具有指定名称的公共方法[包含get/set] string MethodInfo -
GetMembers 获取所有公共成员 - MemberInfo[] 包含Field / Propertie / Method
GetMember 此方法用于搜索具有指定名称的公共成员 string MemberInfo -

Type 反射调用

1. FiledInfo

使用 GetValue/SetValue

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public static void Test()
{
Type myTestType = typeof(MyTestType);
Object myTestInstance = new MyTestType();

FieldInfo fieldInfo1 = myTestType.GetField("Size");

object f1 = fieldInfo1.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Size:" + f1);

fieldInfo1.SetValue(myTestInstance, 10);

object f2 = fieldInfo1.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Size:" + f2);
}

2. PropertyInfo

使用 GetValue/SetValue

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public static void Test()
{
Type myTestType = typeof(MyTestType);
Object myTestInstance = new MyTestType();

PropertyInfo propertyInfo = myTestType.GetProperty("Pos");

object p1 = propertyInfo.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Pos:"+ p1);

propertyInfo.SetValue(myTestInstance, 10);

object p2 = propertyInfo.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Pos:" + p2);
}

PropertyInfoSetValue 实际调用的是 set_XXX 方法
PropertyInfoGetValue 实际调用的是 get_XXX 方法

在一个类中如果定义了一个属性 XXX(PosParent) , 就不能再定义 get_XXX(get_PosParent)/set_XXX(set_PosParent)

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public  class MyTestParent
{
public int SizeParent;
private int posParent;
public int PosParent { get => posParent; set => posParent = value; }

public int mRotationParent;

public int get_PosParent()
{
return posParent;
}
public void set_PosParent(int v)
{
posParent = v;
}
}

编译器会报错

3. MethodInfo

使用 Invoke

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public static void Test()
{
Type myTestType = typeof(MyTestType);
Object myTestInstance = new MyTestType();

MethodInfo getRotaionMethod = myTestType.GetMethod("GetRotation");
MethodInfo setRotationMethod = myTestType.GetMethod("SetRotation");

object getRotationRet1 = getRotaionMethod.Invoke(myTestInstance,new object[0]);
Console.WriteLine("myTestInstance.MethodInfo GetRotation:" + getRotationRet1);

setRotationMethod.Invoke(myTestInstance, new object[1]{10});

object getRotationRet2 = getRotaionMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo GetRotation:" + getRotationRet2);
}

4. MethodInfo Get/Set

使用 Invoke

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public static void Test()
{
Type myTestType = typeof(MyTestType);
Object myTestInstance = new MyTestType();

MethodInfo getPosParentMethod = myTestType.GetMethod("get_PosParent");
MethodInfo setPosParentMethod = myTestType.GetMethod("set_PosParent");

object getPosParentRet1 = getPosParentMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo PosParent:" + getPosParentRet1);

setPosParentMethod.Invoke(myTestInstance, new object[1] { 10 });

object getPosParentRet2 = getPosParentMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo PosParent:" + getPosParentRet2);
}

例子代码

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using System;
using System.Reflection;
using System.Text;

namespace ConsoleApp1
{
public class MyTestParent
{
public int SizeParent;//FieldInfo 父类子类都可以获取,只要是public
private int posParent;//FieldInfo private 无法获取
public int PosParent { get => posParent; set => posParent = value; }// PropertyInfo get_PosParent,set_PosParent

public int mRotationParent;//FieldInfo 父类子类都可以获取,只要是public

//public int get_PosParent()
//{
// return posParent;
//}
//public void set_PosParent(int v)
//{
// posParent = v;
//}

public virtual void SetRotationParent(int r)// memberInfo SetRotationParent
{
mRotationParent = r;
}
public virtual int GetRotationParent()// memberInfo GetRotationParent
{
return mRotationParent;
}
public override string ToString()
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("\nSizeParent:");
stringBuilder.Append(SizeParent);
stringBuilder.Append("\nPosParent:");
stringBuilder.Append(PosParent);
stringBuilder.Append("\nRotationParent");
stringBuilder.Append(mRotationParent);

return stringBuilder.ToString();
}
}

public class MyTestType:MyTestParent
{
#region 使用字段访问
public int Size;//FieldInfo public 可以获取
#endregion

#region 使用系统提供的Get/Set 设置访问属性
public int Pos { get; set; }// PropertyInfo get_Pos,set_Pos
#endregion

#region 使用自定义方法 设置属性
private int mRotation;//FieldInfo private 获取不到

public void SetRotation(int r) // memberInfo SetRotation
{
mRotation = r;
}
public int GetRotation() // memberInfo GetRotation
{
return mRotation;
}
#endregion

public override string ToString()
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("base.ToString:");
stringBuilder.Append(base.ToString());
stringBuilder.Append("\nSize:");
stringBuilder.Append(Size);
stringBuilder.Append("\nPos:");
stringBuilder.Append(Pos);
stringBuilder.Append("\nRotation");
stringBuilder.Append(mRotation);

return stringBuilder.ToString();
}
}
public class TypeTest
{
public static void Test()
{
//Type类型
Type myTestType = typeof(MyTestType);

//一个不明类型的实例
Object myTestInstance = new MyTestType();

//如何使用这个实例访问 对象属性

Console.WriteLine("myTestType.Name:" + myTestType.Name);
Console.WriteLine("myTestType.FullName:" + myTestType.FullName);
Console.WriteLine("myTestType.Namespace:" + myTestType.Namespace);
Console.WriteLine("myTestType.BaseType:" + myTestType.BaseType);
Console.WriteLine("myTestType.UnderlyingSystemType:" + myTestType.UnderlyingSystemType);

Console.WriteLine("=========fieldInfos=========");
FieldInfo[] fieldInfos = myTestType.GetFields();
for (int i = 0,length = fieldInfos.Length; i < length; i++)
{
FieldInfo fieldInfo = fieldInfos[i];
Console.WriteLine(fieldInfo);
}
Console.WriteLine("==================");

Console.WriteLine("=======FieldInfo Test===========");
FieldInfo fieldInfo1 = myTestType.GetField("Size");
object f1 = fieldInfo1.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Size:" + f1);
fieldInfo1.SetValue(myTestInstance, 10);
object f2 = fieldInfo1.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Size:" + f2);
Console.WriteLine("==================");


Console.WriteLine("=========memberInfos=========");
MemberInfo[] memberInfos = myTestType.GetMembers();
for (int i = 0, length = memberInfos.Length; i < length; i++)
{
MemberInfo fieldInfo = memberInfos[i];
Console.WriteLine(fieldInfo);
}
Console.WriteLine("==================");

Console.WriteLine("=========propertyInfos=========");
PropertyInfo[] propertyInfos = myTestType.GetProperties();
for (int i = 0, length = propertyInfos.Length; i < length; i++)
{
PropertyInfo fieldInfo = propertyInfos[i];
Console.WriteLine(fieldInfo);
}

Console.WriteLine("==================");

Console.WriteLine("=======PropertyInfo Invoke===========");
PropertyInfo propertyInfo = myTestType.GetProperty("Pos");

object p1 = propertyInfo.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Pos:"+ p1);
propertyInfo.SetValue(myTestInstance, 10);
object p2 = propertyInfo.GetValue(myTestInstance);
Console.WriteLine("myTestInstance.Pos:" + p2);
Console.WriteLine("==================");

Console.WriteLine("=========methodInfos=========");
MethodInfo[] methodInfos = myTestType.GetMethods();
for (int i = 0, length = methodInfos.Length; i < length; i++)
{
MethodInfo fieldInfo = methodInfos[i];
Console.WriteLine(fieldInfo);
}
Console.WriteLine("==================");

Console.WriteLine("=======MethodInfo Invoke===========");
MethodInfo getRotaionMethod = myTestType.GetMethod("GetRotation");
MethodInfo setRotationMethod = myTestType.GetMethod("SetRotation");

object getRotationRet1 = getRotaionMethod.Invoke(myTestInstance,new object[0]);
Console.WriteLine("myTestInstance.MethodInfo GetRotation:" + getRotationRet1);

setRotationMethod.Invoke(myTestInstance, new object[1]{10});

object getRotationRet2 = getRotaionMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo GetRotation:" + getRotationRet2);


Console.WriteLine("==================");

Console.WriteLine("=======MethodInfo Get/Set Invoke===========");
MethodInfo getPosParentMethod = myTestType.GetMethod("get_PosParent");
MethodInfo setPosParentMethod = myTestType.GetMethod("set_PosParent");

object getPosParentRet1 = getPosParentMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo PosParent:" + getPosParentRet1);

setPosParentMethod.Invoke(myTestInstance, new object[1] { 10 });

object getPosParentRet2 = getPosParentMethod.Invoke(myTestInstance, new object[0]);
Console.WriteLine("myTestInstance.MethodInfo PosParent:" + getPosParentRet2);

Console.WriteLine("==================");

Console.WriteLine("myTestInstance:" + myTestInstance);


}
}
}

执行结果

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