[2008/07/01]code

using System; using System.Collections.Generic; using System.Web; using System.Web.UI.WebControls; public class TreeViewState { public void SaveTreeView(TreeView treeView, string key) { List<bool?> list = new List<bool?>(); SaveTreeViewExpandedState(treeView.Nodes, list); HttpContext.Current.Session[key + treeView.ID] = list; } private int RestoreTreeViewIndex; public void RestoreTreeView(TreeView treeView, string key) { RestoreTreeViewIndex = 0; RestoreTreeViewExpandedState(treeView.Nodes, (List<bool?>)HttpContext.Current.Session[key + treeView.ID] ?? new List<bool?>()); } private void SaveTreeViewExpandedState(TreeNodeCollection nodes, List<bool?> list) { foreach (TreeNode node in nodes) { list.Add(node.Expanded); if (node.ChildNodes.Count > 0) { SaveTreeViewExpandedState(node.ChildNodes, list); } } } private void RestoreTreeViewExpandedState(TreeNodeCollection nodes, List<bool?> list) { foreach (TreeNode node in nodes) { if (RestoreTreeViewIndex >= list.Count) break; node.Expanded = list[RestoreTreeViewIndex++]; if (node.ChildNodes.Count > 0) { RestoreTreeViewExpandedState(node.ChildNodes, list); } } } }

using System; using System.Collections.Generic; using System.Text; namespace GenericImplementation { class SavingsBank { protected string name; protected int age; private const float MIN_AMT_LMT = 10000; private float accBalance; public SavingsBank(string AccName, int age, string opType, float balanceAmt) { this.Name = AccName; this.Age = age; if (opType.ToLower().Equals("credit")) { this.DoCredit(balanceAmt); } else { this.DoDebit(balanceAmt); } } public string Name { get { return name; } set { name = value; } } public int Age { get { return age; } set { age = value; } } public float TotalBalance { get { return accBalance; } set { accBalance = value; } } public void DoCredit(float credBal) { TotalBalance = TotalBalance + credBal; } public void DoDebit(float debBal) { if (TotalBalance - debBal > MIN_AMT_LMT) { TotalBalance = TotalBalance - debBal; } else { throw new Exception("Balance should not be less than minimum amount " + MIN_AMT_LMT.ToString()); } } public override string ToString() { return " Account name :" + this.Name + " Age:" + this.age.ToString() + " Balance : " + this.TotalBalance.ToString(); } } }

using System; using System.Collections.Generic; using System.Text; namespace GenericImplementation { class CurrentBank { protected string name; protected int age; private float accBalance; private const float MIN_AMT_LMT = 20000; public CurrentBank(string AccName, int age,string opType,float balanceAmt) { this.Name = AccName; this.Age = age; if (opType.ToLower().Equals("credit")) { this.DoCredit(balanceAmt); } else { this.DoDebit(balanceAmt); } } public string Name { get { return name; } set { name = value; } } public float GetCreditLimit { get { return MIN_AMT_LMT; } } public int Age { get { return age; } set { age = value; } } public float TotalBalance { get { return accBalance; } set { accBalance = value; } } public void DoCredit(float credBal) { TotalBalance = TotalBalance + credBal; } public void DoDebit(float debBal) { if (TotalBalance - debBal > MIN_AMT_LMT) { TotalBalance = TotalBalance - debBal; } else { throw new Exception("Balance should not be less than minimum amount " + MIN_AMT_LMT.ToString()); } } public override string ToString() { return " Account name :" +this.Name + " Age:" +this.age.ToString() + " Balance : " + this.TotalBalance.ToString(); } } }

using System; using System.Collections; using System.Collections.Generic; using System.Text; namespace GenericImplementation { class GenericBankCollection<AccountType> : CollectionBase { public void Add(AccountType GenericObject) { InnerList.Add(GenericObject); } public void Remove(int index) { InnerList.RemoveAt(index); } public AccountType Item(int index) { return (AccountType)InnerList[index]; } } }

using System; using System.Collections.Generic; using System.Text; namespace GenericImplementation { class Program { static void Main(string[] args) { GenericBankCollection<SavingsBank> sbAccs = new GenericBankCollection<SavingsBank>(); sbAccs.Add(new SavingsBank("Sriram",34,"credit",1000)); sbAccs.Add(new SavingsBank("Saik",30,"debit",1000)); GenericBankCollection<CurrentBank> curAccs = new GenericBankCollection<CurrentBank>(); curAccs.Add(new CurrentBank("Mohan", 34, "credit", 1000)); curAccs.Add(new CurrentBank("Krishna", 30, "credit", 1000)); System.Console.WriteLine("Savings Accounts"); System.Console.WriteLine("========="); foreach (SavingsBank savingsBank in sbAccs) { System.Console.WriteLine(savingsBank.ToString()); } System.Console.WriteLine("Current Accounts"); System.Console.WriteLine("========="); foreach (CurrentBank CurrentBank in curAccs) { System.Console.WriteLine(CurrentBank.ToString()); } System.Console.ReadLine(); } } }

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only_endure
大宋提刑官 Recite MSDN classic code :)
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发表于：2008-07-01 16:35:415楼得分:0

Using IComparable and IComparer to compare objects
IComparable

C# code

public class Person : IComparable 

{

    public Person() { } 

    // private fields 

    private string _FirstName;

    private string _LastName; 

    private int _Age;

    public Person(string FirstName, string LastName, int Age)

    {

        this.FirstName = FirstName; 

        this.LastName = LastName;

        this.Age = Age;

    }

    //Properties

    public string FirstName

    {

        get { return _FirstName; } 

        set { _FirstName = value; }

    }

    public string LastName

    {

        get { return _LastName; } 

        set { _LastName = value; }

    }

    public int Age 

    {

        get { return _Age; }

        set { _Age = value; } 

    }

    //Interface method

    public int CompareTo(object o)

    {

        Person Temp = (Person)o; 

        if (this.Age < Temp.Age)

        {

            return 1;

        } 

        if (this.Age > Temp.Age) 

        { 

            return -1;

        }

        else 

        {

            return 0;

        }

    }

}

C# code

public class Room 

{

    protected ArrayList oList;

    public Room() 

    {

        oList = new ArrayList(); 

    }

    //Indexer

    public Person this[int index] 

    {

        get { return (Person)oList[index]; }

        set { oList[index] = value; } 

    }

    //Properties

    public int Count 

    {

        get { return oList.Count; }

    }

    //Methods

    public void AddNewPerson(Person o) 

    {

        oList.Add(o);

    }

    public void SortByAge()

    {

        oList.Sort();

    }

    public void ReverseByAge()

    {

        oList.Reverse(); 

    }

}

C# code

class Program

{

    public static void Main(string[] args)

    {

        Console.WriteLine("Hello World!"); 

        // TODO: Implement Functionality Here

        Person me = new Person("Bejaoui","Bechir",29); 

        Person myFather = new Person("Bejaoui","Massinissa",65);

        Person myGrandFather = new Person("Bejaoui","Shishaq",95);

        //Add some persons to the room

        Room LivingRoom = new Room(); 

        LivingRoom.AddNewPerson(me); 

        LivingRoom.AddNewPerson(myFather); 

        LivingRoom.AddNewPerson(myGrandFather);

        LivingRoom.SortByAge();

        for(int i = 0; i<LivingRoom.Count;i++)

        {

            Console.WriteLine( "First name : " + LivingRoom[i].FirstName + Environment.NewLine ); 

            Console.WriteLine( "Last name : " + LivingRoom[i].LastName + Environment.NewLine ); 

            Console.WriteLine( "Age : " + LivingRoom[i].Age + Environment.NewLine );

        }

        Console.WriteLine("*** After reversing according to age ***" + Environment.NewLine);

        LivingRoom.ReverseByAge();

        for(int i = 0; i<LivingRoom.Count;i++) 

        {

            Console.WriteLine( "First name : " + LivingRoom[i].FirstName + Environment.NewLine ); 

            Console.WriteLine( "Last name : " + LivingRoom[i].LastName + Environment.NewLine );

            Console.WriteLine( "Age : " + LivingRoom[i].Age + Environment.NewLine );

        }

        Console.WriteLine("Done");

        Console.Write("Press any key to continue . . . ");

        Console.ReadKey(true); Console.Beep(); 

    }

}

修改删除举报引用回复

/*Given this design of person type: */ public class Person { public Person() { } // private fields private string _FirstName; private string _LastName; private int _Age; public Person(string FirstName, string LastName, int Age) { this.FirstName = FirstName; this.LastName = LastName; this.Age = Age; } //Properties public string FirstName { get { return _FirstName; } set { _FirstName = value; } } public string LastName { get { return _LastName; } set { _LastName = value; } } public int Age { get { return _Age; } set { _Age = value; } } }

Say that we want to sort objects person by name now. First we ought to define a kind for comparer object that implements the IComparer interface: /// <summary> /// CompareByName is an object that enables us compare /// two person objects, it implements the IComprer interface. /// </summary> public class CompareByName : IComparer { public CompareByName() { } //Implementing the Compare method public int Compare(object object1, object object2) { Person Temp1 = (Person)object1; Person Temp2 = (Person)object2; return string.Compare(Temp1.FirstName, Temp2.FirstName); } }

Then we implement the Room container as follow: public class Room { protected ArrayList oList; public Room() { oList = new ArrayList(); } //Indexer public Person this[int index] { get { return (Person)oList[index]; } set { oList[index] = value; } } //Properties public int Count { get { return oList.Count; } } //Methods public void AddNewPerson(Person o) { oList.Add(o); } public void SortByAge() { CompareByName Comparer = new CompareByName(); oList.Sort(Comparer); } public void ReverseByAge() { oList.Reverse(); } }