幻想魚的幻想空間

Main Function

namespace ConsoleGenericsAssumption
{
    class Program
    {
        static void Main(string[] args)
        {
            GenericTypeResolverTest v = new GenericTypeResolverTest("Hello Alam");
            //v.Value = "Hello ALam";
            v.ShowInConsole();
            // -----same result, differnet implementation---
            Console.WriteLine("-----same result, differnet implementation---");
            string showString = v.ToString();
            Console.WriteLine("{0}", showString);
            Console.ReadLine();

            // generic for string
            string ValueString = "Hello Yaya";
            ValueString.ShowInConsole();

            // generic for int
            int ValueInt = 12345;
            ValueInt.ShowInConsole();
        }
    }
}

Another class

    public class GenericTypeResolverTest
    {
        public string Value { get; set; }

        public GenericTypeResolverTest() { }
        public GenericTypeResolverTest(string value)
        {
            Value = value;
        }
        public override string ToString()
        {
            return Value.ToString();
        }
    }

    public static class GenericTypeResolverMethodTest
    {
        public static void ShowInConsole(this T obj)
        {
            Console.WriteLine(obj.ToString());
            Console.ReadLine();
        }
    }

static void Main(string[] args)
        {
            // [] is specific type and fixed length.
            // It is a data structure.
            String[] arr = new string[] {"Hi", "I", "am", "ALam"};
            ShowMessage(arr);

            // List is specific type and unbounded length. 
            // namespace is System.Collection.Generic
            List list = new List();
            list.Add("Hi");
            list.Add("I");
            list.Add("am");
            list.Add("Alam");
            ShowMessage(list);

            // ArrayList is any type and undounded length.
            // namespace is System.Collection
            ArrayList arraylist = new ArrayList();
            arraylist.Add("Hi");
            arraylist.Add("I");
            arraylist.Add("am");
            arraylist.Add("Alam");
            arraylist.Add(12345); // when we call the ShowMessage, it will be wrong.
            ShowMessage(arraylist);
        }

        private static void ShowMessage(string[] temp)
        {
            foreach (string aaa in temp)
            {
                Console.WriteLine("{0}", aaa);
            }
            Console.ReadLine();
        }

        private static void ShowMessage(List temp)
        {
            foreach (string aaa in temp)
            {
                Console.WriteLine("{0}", aaa);
            }
            Console.ReadLine();
            }

        private static void ShowMessage(ArrayList temp)
        {
            foreach (string aaa in temp)
            {
                Console.WriteLine("{0}", aaa);
            }
            Console.ReadLine();
        }
    }

// to associates a stored procedure which user defined in the database.
// Must write it before func.
[global::System.Data.Linq.Mapping.FunctionAttribute(Name ="stored procedure name")]
// Undertake on a code, we make a func. let user to access the stored procedure.
// When SP exist input variables, you must use "Linq.Mapping.ParameterAttribute" to 
// select the variable in DB and use "System.Nullable" to set 
// what variable you wnat to assign in code.
public int storedProcedureForC#Class(
[global::System.Data.Linq.Mapping.ParameterAttribute(Name:"inputVarName", 
DbType="inputVarType"] System.Nullable varInC#)
{
// Execute the stored procedure.
IExecuteResult objectForSP = this.ExecuteMethodCall(this, (
(MethodInfo)(MethodInfo.GetCurrentMethod())), varInC#);
return ((int)(result.ReturnValue));
}

So........We know "as" is a powerful method that perform certain types of conversions between compatible reference types. for example:

// ...... //
Array[] = dataTable;
// ....do something for dataTable.//
const string = "ALamTest";
Session[ALamTest] = dataTable;

//....do another something...//

Array[] getTable = Session[AlamTest] as Array[]

When we use Session Mechanism, "as" is a useful method let us to redesign the object which is taken out from the session.

This is a new Characteristic in C#3.0

namespace ConsoleUseExtensionMethod
{
    public static class TestExtensionConsumer
    {
        public static void Main()
        {
            var s = "AlamInGamania";
            // Extension Method
            Console.WriteLine(s.WordCount());
            Console.WriteLine("{0}{1}","效果同上",WordCount(s));
            Console.ReadLine();
        }

        ///summary
        /// NonGenerics and must use static class
        ///summary
        ///<input> the input type is that want to extend </input>
        ///<return>the length of string</return>
        public static int WordCount(this string v)
        {
            return v.Length;  // Please "Note" Input parameter that The keyword "this".
        }
    }

}

If Type Built-in Functions has a same name with your func. name, C# 3.0 compiler will execute Built-in Function.