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Reflection Examples in C#
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/* | |
This example shows how to dynamically load assembly, how to create object instance, how to invoke method or how to get and set property value. | |
Create instance from assembly that is in your project References | |
*/ | |
//The following examples create instances of DateTime class from the System assembly. | |
// create instance of class DateTime | |
DateTime dateTime = (DateTime)Activator.CreateInstance(typeof(DateTime)); | |
// create instance of DateTime, use constructor with parameters (year, month, day) | |
DateTime dateTime = (DateTime)Activator.CreateInstance(typeof(DateTime), new object[] { 2008, 7, 4 }); | |
//Create instance from dynamically loaded assembly | |
//All the following examples try to access to sample class Calculator from Test.dll assembly. The calculator class can be defined like this. | |
namespace Test | |
{ | |
public class Calculator | |
{ | |
public Calculator() { ... } | |
private double _number; | |
public double Number { get { ... } set { ... } } | |
public void Clear() { ... } | |
private void DoClear() { ... } | |
public double Add(double number) { ... } | |
public static double Pi { ... } | |
public static double GetPi() { ... } | |
} | |
} | |
//Examples of using reflection to load the Test.dll assembly, to create instance of the Calculator class and to access its members (public/private, instance/static). | |
// dynamically load assembly from file Test.dll | |
Assembly testAssembly = Assembly.LoadFile(@"c:\Test.dll"); | |
// get type of class Calculator from just loaded assembly | |
Type calcType = testAssembly.GetType("Test.Calculator"); | |
// create instance of class Calculator | |
object calcInstance = Activator.CreateInstance(calcType); | |
// get info about property: public double Number | |
PropertyInfo numberPropertyInfo = calcType.GetProperty("Number"); | |
// get value of property: public double Number | |
double value = (double)numberPropertyInfo.GetValue(calcInstance, null); | |
// set value of property: public double Number | |
numberPropertyInfo.SetValue(calcInstance, 10.0, null); | |
// get info about static property: public static double Pi | |
PropertyInfo piPropertyInfo = calcType.GetProperty("Pi"); | |
// get value of static property: public static double Pi | |
double piValue = (double)piPropertyInfo.GetValue(null, null); | |
// invoke public instance method: public void Clear() | |
calcType.InvokeMember("Clear", | |
BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public, | |
null, calcInstance, null); | |
// invoke private instance method: private void DoClear() | |
calcType.InvokeMember("DoClear", | |
BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.NonPublic, | |
null, calcInstance, null); | |
// invoke public instance method: public double Add(double number) | |
double value = (double)calcType.InvokeMember("Add", | |
BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public, | |
null, calcInstance, new object[] { 20.0 }); | |
// invoke public static method: public static double GetPi() | |
double piValue = (double)calcType.InvokeMember("GetPi", | |
BindingFlags.InvokeMethod | BindingFlags.Static | BindingFlags.Public, | |
null, null, null); | |
// get value of private field: private double _number | |
double value = (double)calcType.InvokeMember("_number", | |
BindingFlags.GetField | BindingFlags.Instance | BindingFlags.NonPublic, | |
null, calcInstance, null); | |
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