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2010-05-26T15:31:53Z

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==Analyze method parameters using reflection==

<source lang="csharp">using System;
using System.Reflection;

class MyClass {
public MyClass(int i, int j) {
}

public int sum() {
return 0;
}

public bool isBetween(int i) {
return false;
}

public void set(int a, int b) {
}

public void set(double a, double b) {
}

public void show() {
Console.WriteLine("show");
}
}

class MainClass {
public static void Main() {
Type t = typeof(MyClass);

Console.WriteLine("Analyzing methods in " + t.Name);
Console.WriteLine();

Console.WriteLine("Methods supported: ");

MethodInfo[] mi = t.GetMethods();

// Display methods supported by MyClass.
foreach(MethodInfo m in mi) {
// Display return type and name.
Console.Write(" " + m.ReturnType.Name +
" " + m.Name + "(");

// Display parameters.
ParameterInfo[] pi = m.GetParameters();

for(int i=0; i < pi.Length; i++) {
Console.Write(pi[i].ParameterType.Name +
" " + pi[i].Name);
if(i+1 < pi.Length) Console.Write(", ");
}

Console.WriteLine(")");

Console.WriteLine();
}
}
}</source>
<pre class=codeResult>Analyzing methods in MyClass
Methods supported:
Int32 sum()
Boolean isBetween(Int32 i)
Void set(Int32 a, Int32 b)
Void set(Double a, Double b)
Void show()
Type GetType()
String ToString()
Boolean Equals(Object obj)
Int32 GetHashCode()</pre>

==Generic parameter information==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
public class MainClass
{
public static void Main()
{
PrintTypeParams(typeof(List<>));
PrintTypeParams(typeof(List<int>));
PrintTypeParams(typeof(Nullable<>));
}
private static void PrintTypeParams(Type t)
{
Console.WriteLine(t.FullName);
foreach (Type ty in t.GetGenericArguments())
{
Console.WriteLine(ty.FullName);
Console.WriteLine(ty.IsGenericParameter);
if (ty.IsGenericParameter)
{
Type[] constraints = ty.GetGenericParameterConstraints();
foreach (Type c in constraints)
Console.WriteLine(c.FullName);
}
}
}
}</source>
<pre class=codeResult>System.Collections.Generic.List`1
True
System.Collections.Generic.List`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicK
eyToken=b77a5c561934e089]]
System.Int32
False
System.Nullable`1
True
System.ValueType</pre>

==Invoke method with parameter type int==

<source lang="csharp">using System;
using System.Reflection;

class MyClass {
public MyClass(int i) {
Console.WriteLine("Constructing MyClass(int). ");
}

public MyClass(int i, int j) {
Console.WriteLine("Constructing MyClass(int, int). ");
}

public int sum() {
return 0;
}

public bool isBetween(int i) {
return false;
}

public void set(int a, int b) {
Console.Write("Inside set(int, int). ");
}

public void set(double a, double b) {
Console.Write("Inside set(double, double). ");
}

public void show() {
Console.WriteLine("Values");
}
}

class MainClass {
public static void Main() {
Type t = typeof(MyClass);
int x;
// Find matching constructor.
ConstructorInfo[] ci = t.GetConstructors();

for(x=0; x < ci.Length; x++) {
ParameterInfo[] pi = ci[x].GetParameters();
if(pi.Length == 2) break;
}

if(x == ci.Length) {
Console.WriteLine("No matching constructor found.");
return;
}
else
Console.WriteLine("Two-parameter constructor found.\n");

// Construct the object.
object[] consargs = new object[2];
consargs[0] = 10;
consargs[1] = 20;
object reflectOb = ci[x].Invoke(consargs);
}
}</source>
<pre class=codeResult>Two-parameter constructor found.
Constructing MyClass(int, int).</pre>

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Csharp/CSharp Tutorial/Reflection/Parameter - История изменений

в 15:31, 26 мая 2010

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