Csharp/C Sharp/Reflection/ConstructorInfo

Call GetConstructor to get the constructor

<source lang="csharp"> using System; using System.Text; using System.Reflection; class MainClass {

   public static StringBuilder CreateStringBuilder()
   {
       Type type = typeof(StringBuilder);
       Type[] argTypes = new Type[] { typeof(System.String), typeof(System.Int32) };
       ConstructorInfo cInfo = type.GetConstructor(argTypes);
       object[] argVals = new object[] { "Some string", 30 };
       StringBuilder sb = (StringBuilder)cInfo.Invoke(argVals);
       return sb;
   }

}

</source>

Get parameter information by using ConstructorInfo and ParameterInfo

<source lang="csharp"> using System; using System.Collections; using System.Reflection; public class MainClass{

   public static void Main() {
       Assembly LoadedAsm = Assembly.LoadFrom("yourName");
       Console.WriteLine(LoadedAsm.FullName);
       Type[] LoadedTypes = LoadedAsm.GetTypes();
       if (LoadedTypes.Length == 0) {
           Console.WriteLine("\tNo Types!");
       } else {
           Console.WriteLine("\tFound Types:");
           foreach (Type t in LoadedTypes) {
               if (t.IsPublic && !t.IsEnum && !t.IsValueType) {
                   Console.WriteLine("Type: {0}", t.FullName);
                   PrintConstructorInfo(t);
               }
           }
       }
   }
   private static  void PrintConstructorInfo(Type t) {
       ConstructorInfo[] ctors = t.GetConstructors();
       foreach (ConstructorInfo c in ctors) {
           ParameterInfo[] pList = c.GetParameters();
           if (pList.Length == 0) {
               if (c.IsStatic)
                   Console.WriteLine("\tFound static Constructor.");
               else
                   Console.WriteLine("\tFound default consructor.");
           } else {
               Console.WriteLine("\tConstructor:");
               foreach (ParameterInfo p in pList) {
                   Console.WriteLine("\t\t{0} {1}", p.ParameterType.FullName,p.Name);
               }
           }
       }
   }

}

</source>

Invoke in Constructor through ConstructorInfo

<source lang="csharp">

using System; using System.Text; using System.Reflection; class MainClass {

   public static void Main() {
       Type type = typeof(StringBuilder);
       Type[] argTypes = new Type[] { typeof(System.String), typeof(System.Int32) };
       ConstructorInfo cInfo = type.GetConstructor(argTypes);
       object[] argVals = new object[] { "Some string", 30 };
       StringBuilder sb = (StringBuilder)cInfo.Invoke(argVals);
       Console.WriteLine(sb.ToString());
       
   }

}

      </source>