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c# 名词解析

Fri, 12 Aug 2011 09:39:00 GMT

.net框架
           --框架�c�d��
           --CLR(公共语言�q�行�?
                   --CLS(公共语言规范)
                   --CTS(公用�c�d��pȝ��)
--------------------------------------------
MSIL 微��Y公共语言
JIT (实时)�~�译�?img src ="http://www.aygfsteel.com/hwpok/aggbug/356406.html" width = "1" height = "1" />

惠万�?/a> 2011-08-12 17:39 发表评论

c# dataGridView

Fri, 15 Jul 2011 08:47:00 GMT

namespace MyForm
{
    public partial class TeacherListForm : Form
    {
        private DataSet dataSet = new DataSet(); // 声名�q�初始化　dataSet
        private OracleDataAdapter dataAdapter; // 声明　dataadapter

        public TeacherListForm()
        {
            InitializeComponent();
        }

        private void TeacherListForm_Load(object sender, EventArgs e)
        {
            string sql = "SELECT ID,login_name,PASSWORD,status,name,gender,phone,email,address,grade,class,is_using,to_char(create_time,'yyyy-mm-dd hh24:mi') createTime,to_char(update_time,'yyyy-mm-dd hh24:mi') updateTime,remark FROM t_vs_student ";
            dataAdapter = new OracleDataAdapter(sql, DBHelper.connection);

            dataAdapter.Fill(dataSet, "t_vs_student");
            this.dgvTeacher.DataSource=dataSet.Tables["t_vs_student"];
        }

        private void btnColseSearchTeacher_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnSaveTeacher_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("�(zh��n)�确实要��修改保存到数据库吗�Q?/span>", "操作提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            if (result == DialogResult.OK)
            {
                OracleCommandBuilder builder = new OracleCommandBuilder(dataAdapter);
                dataAdapter.Update(dataSet, "t_vs_student");
            }
        }
    }
}

惠万�?/a> 2011-07-15 16:47 发表评论

C# ListView

Fri, 15 Jul 2011 07:54:00 GMT

private void FillListView()
        {
            string id; //id�?br />            string loginName ; // 用户�?br />            string password ; // 密码
            string status; // 状�?br />            string name; // 姓名
            string gender; // 性别
            string phone; // �?sh��)�?br />            string email; // �?sh��)子邮�g
            string address;
            string grade; // �q��
            string sClass; // 班��
            string createTime;　//  创徏旉��
            string updateTime;　//修改旉��
            string remark; // 备注

            try
            {
                // 构徏sql
                string sql = "SELECT ID,login_name,PASSWORD,status,name,gender,phone,email,address,grade,class,is_using,to_char(create_time,'yyyy-mm-dd hh24:mi') createTime,to_char(update_time,'yyyy-mm-dd hh24:mi') updateTime,remark FROM t_vs_student ";
                if (this.txtSearchName.Text.Trim() != "")
                {
                    sql += string.Format(" where name like '%{0}%'", this.txtSearchName.Text.Trim());
                }

                OracleCommand command = new OracleCommand(sql, DBHelper.connection);
                DBHelper.connection.Open();
                OracleDataReader dataReader = command.ExecuteReader();

                // 清除列表��?br />                this.lvStudent.Items.Clear();
                // ��(g��)查dataReader没有数据
                if (!dataReader.HasRows)
                {
                    MessageBox.Show("没有扑ֈ��(zh��n)�要扄��用户", "�l�果提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    while (dataReader.Read())
                    {
                        id = dataReader["id"].ToString();
                        loginName = dataReader["login_name"].ToString();
                        password = dataReader["password"].ToString();
                        status = dataReader["status"].ToString();
                        name = dataReader["name"].ToString();
                        gender = dataReader["gender"].ToString();
                        phone = dataReader["phone"].ToString();
                        email = dataReader["email"].ToString();
                        address = dataReader["address"].ToString();
                        grade = dataReader["grade"].ToString();
                        sClass = dataReader["class"].ToString();
                        createTime = dataReader["createTime"].ToString();
                        updateTime = dataReader["updateTime"].ToString();
                        remark = dataReader["remark"].ToString();

                        //loginName = (string)dataReader.Read("login_name");

                        // 创徏列表选项
                        ListViewItem lviStudent = new ListViewItem(loginName);

                        // �q�个��g��要用��L(f��ng)��Q�但是对�E�序员有�?br />                        //lviStudent.Tag = id;

                        // ��d��一�?br />                        this.lvStudent.Items.Add(lviStudent);

                        //　��d��行数�?br />                        lviStudent.SubItems.AddRange(new string[] {name, gender, phone, email, address, grade, sClass,createTime,updateTime,remark});
                    }
                    dataReader.Close();
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                DBHelper.connection.Close();
            }

        }

惠万�?/a> 2011-07-15 15:54 发表评论

Thu, 14 Jul 2011 16:59:00 GMT

建立�q�接分�ؓ(f��)六步�Q?br />1.定义�q�接字符�Ԍ��oracle 的连接字�W�串为：(x��)

private static string connString = "Data Source=192.168.1.130:1521/mydata;Persist Security Info=True;User ID=em_test;Password=test123;Unicode=True";

2.�Ҏ(gu��)��q�接字符串成�q�接
3.打开�q�接
4.实例命��o(h��)对象
5.操作
6.关闭�q�接

看一个例子：(x��)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OracleClient;

namespace OpenCloseDB
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OracleConnection connection = null;
            int num = 0;
            string message = "";
            String sql = "select count(*) from ex_user";
            try
            {
                string connString = "Data Source=mydata;Persist Security Info=True;User ID=test;Password=huikk123;Unicode=True";

                // 创徏connection对象
                connection = new OracleConnection(connString);

                // 打开�q�接
                connection.Open();
                OracleCommand command = new OracleCommand(sql, connection);
                num = int.Parse(command.ExecuteScalar().ToString());
                message = string.Format("共有{0}条用户信�?", num);
                MessageBox.Show(message);
            }
            catch (Exception ex)
            {

                MessageBox.Show("出现异常"+ex.Message);
            }
            finally
            {
                if (connection != null)
                {
                    connection.Close();
                }
            }
        }
    }
}

惠万�?/a> 2011-07-15 00:59 发表评论

Wed, 13 Jul 2011 06:36:00 GMT

c#在java的基��上有很大的进�?
partial关键字的加入��是一个具体的体现.
partial允许把一个一个类的代码定义在多个文�g�?
�q�个�Ҏ(gu��)��在winform�~�辑里体现的淋漓��致.

比如:form文�g,用户自己的事�?�{�代码放在一�c�里,而由ide生成的代码放在另一个文仉��.
�q�样做的好外�?用户只关�?j��)自��p��兛_��(j��)的部�?

c#�q�行�E�序

Application.Run(new UserLogin());

c#退出窗体程�?br />

Application.Exit();

惠万�?/a> 2011-07-13 14:36 发表评论

Tue, 12 Jul 2011 17:25:00 GMT

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HelloACCP
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1 = 1;
            int num2 = 2;
            Console.WriteLine("�W�一个数是{0},�W�二个数是{1}.",num1,num2);
            swap(ref num1, ref num2);
            Console.WriteLine("�W�一个数是{0},�W�二个数是{1}.", num1, num2);
            Console.ReadLine();
        }

        private static void swap(ref int num1, ref int num2)
        {
            int temp = num1;
            num1 = num2;
            num2 = temp;
        }
    }
}
在java�?是做不到�q�样�?br />

惠万�?/a> 2011-07-13 01:25 发表评论

C# 事�g

Sat, 13 Mar 2010 00:44:00 GMT

/*
* �?nbsp;SharpDevelop 创徏�?br /> * 用户: huy
* 日期: 2010-3-13
* 旉��: 7:35
*/

using System;
using System.Threading;
class Publisher//出版�C?/span>
{
    public delegate void Publish();//声明事�g所需代理
    public event Publish OnPublish;//事�g代理

    public void issue()//触发事�g的方�?/span>
    {
        if(OnPublish != null)
        {
            Console.WriteLine("发行刊物!");
            OnPublish();
        }
    }
}

class Subscriber//订阅�?/span>
{
    public void Receiver()//在事件订阅者中定义事�g处理�E�序
    {
        Console.WriteLine("刊物已经收到!");
    }
}

class Story
{
    static void Main()
    {
        Publisher publisher = new Publisher();
        Subscriber subscriber = new Subscriber();
        publisher.OnPublish += new Publisher.Publish(subscriber.Receiver);
        publisher.issue();
        Thread.Sleep(5000);
    }
}

惠万�?/a> 2010-03-13 08:44 发表评论

C# 委托

Sat, 06 Mar 2010 15:42:00 GMT

/*
* �?nbsp;SharpDevelop 创徏�?br /> * 用户: huy
* 日期: 2010-3-6
* 旉��: 23:30
*/

using System;
using System.Threading;
delegate void EatDelegate(string food);
class MyDelegate
{
    static void zsEat(string food)
    {
        Console.WriteLine("张三"+food);
    }

    static void Main()
    {
        EatDelegate zs = new EatDelegate(zsEat);
        zs("西瓜");
        Thread.Sleep(5000);
    }
}

当我们需要把�Ҏ(gu��)��做�ؓ(f��)参数传递给其他�Ҏ(gu��)��的时候，��需要��用委托�?/p>

因�ؓ(f��)有时候，我们要操作的对象�Q�不是针�Ҏ(gu��)��据进行的�Q�而是针对某个�Ҏ(gu��)��q�行的操作�?/p>

我们�q�是来以代码入手

Code
using System;
namespace gosoa.com.cn
{
    public class test
    {
        public delegate string GetAString();
        public static void Main()
        {
            int x=10;
            GetAString firstString=new GetAString(x.ToString);
            Console.WriteLine(firstString());
            //上句和下面这句类伹{�?br />             //Console.WriteLine(x.ToString());
        }
    }
}

在上例中�Q�public delegate string GetAString(); ��是声明�?ji��n)一个委�?delegate)�Q�其语法和方法的定义�c�M��Q�只是没有方法体�Q�前面要加上关键�?delegate 。定义一个委托，基本上是定义一个新�c�，所以，可以在�Q何定义类的地方，定义委托�?/p>

注意�Q�在C#中，委托��L��自带一个有参数的构造函敎ͼ��q�就是�ؓ(f��)什么在上例中，GetAString firstString=new GetAString(x.ToString); 通过�q�句初始化一个新的delegate的时候，�l�传递了(ji��n)一个x.ToString �Ҏ(gu��)��。但�Q�在定义delegate的时候，却没有定义参数�?/p>

在看另一个例子之前，我们先来�?ji��n)解下匿名方法�?/p>

匿名�Ҏ(gu��)��的��用，我们看个例子

Code
using System;
namespace gosoa.com.cn
{
    public class test
    {
        delegate string GetUrl(string val);
        static void Main(string [] args)
        {
            string domin="asaadsad";
            GetUrl url=delegate(string param)
            {
                 param="http://"+param;
                 return param;
            };
            Console.WriteLine(url(domin));
        }
    }
}

本文来自CSDN博客�Q��{载请标明出处�Q�http://blog.csdn.net/sendling/archive/2009/03/02/3948561.aspx

惠万�?/a> 2010-03-06 23:42 发表评论

Sat, 06 Mar 2010 14:23:00 GMT

.索引器的索引��g��受限为整�?br /> .索引器允�?d��ng)R��?br /> .索引器不是一个变�?br />

/*
* �?nbsp;SharpDevelop 创徏�?br /> * 用户: huy
* 日期: 2010-2-28
* 旉��: 0:20
*/

using System;
using System.Threading;

public class Test
{
    private string name;
    private int age;

    public string Name
    {
        get{return name;}
        set{name = value;}
    }

    public int Age
    {
        get{return age;}
        set{age = value;}
    }
    public static void Main()
    {
        Test test = new Test();
        test.Name = "huyvanpull";
        test.Age = 25;

        Console.WriteLine(test.Name + ";  " + test.Age);
        Thread.Sleep(5000);
    }
}

惠万�?/a> 2010-03-06 22:23 发表评论

C# helloWorld

Tue, 02 Mar 2010 04:40:00 GMT

/*
* �?nbsp;SharpDevelop 创徏�?br /> * 用户: Administrator
* 日期: 2010-3-2
* 旉��: 12:30
*
* 如果你想要更改该模板�Q�那么请使用“工具 | 选项 | �~�辑 | �~�辑标准标题”�?br /> */
using System;
using System.Threading;
public class test
{
     public static void Main()
     {
         Console.WriteLine("Hello World!");
         Thread.Sleep(3000);
     }
}

惠万�?/a> 2010-03-02 12:40 发表评论