frmkdmanage.cs

一个好的系统 对初学者很有用啊 来看看啊

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

namespace ExamCenter.FormTier
{
    public partial　class FrmKdManage : System.Windows.Forms.Form
    {
        private System.Windows.Forms.DataGrid dgUsers;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        //用户数据集
        private DataSet dsUser;
        private DataTable dtUser;

        private enum BtnClick { AddClick, DelClick, EditClick, SaveClick };
        private BtnClick btnClick = BtnClick.SaveClick;

        private DataRow drCurrent;
        public FrmKdManage()
        {
            InitializeComponent();
            MakeBind();
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        private void groupBox2_Enter(object sender, EventArgs e)
        {

        }

        private void FrmKdManage_Load(object sender, EventArgs e)
        {

        }
        private void MakeBind()
        {
            //方法：private void MakeBind()
            //参数：空
            //功能：1.返回所有的用户数据集dsUser
            //      2.将窗体的dgUsers与返回的数据集dsUser绑定
            //	    3.给滚动条UserScroller的属性DtSet赋值
            //返回：空

            //事例化业务逻辑类
            UserBLC userBlc = new UserBLC();
            //以数据集的形式返回用户表
            this.dsUser = userBlc.GetAllUser();
            this.dtUser = this.dsUser.Tables[0];


            //将窗体数据网格dgUsers与用户表绑定
            this.dgUsers.DataSource = this.dtUser;
            //给角色表临时添加一编号列
            DataColumn dcCurrent = new DataColumn("Current", typeof(int));
            this.dtUser.Columns.Add(dcCurrent);
            //给角色表编号列赋值
            int count = 1;
            foreach (DataRow row in this.dtUser.Rows)
            {
                row["Current"] = count++;
            }
            //设置窗体数据网格表现风格
            DataGridTableStyle dgStyle = new DataGridTableStyle();
            dgStyle.MappingName = this.dsUser.Tables[0].TableName;

            DataGridColumnStyle intCount =
                new DataGridTextBoxColumn();
            intCount.MappingName = "Current";
            intCount.HeaderText = "  用户编号";
            intCount.Width = 75;
            dgStyle.GridColumnStyles.Add(intCount);

            DataGridColumnStyle ename = new DataGridTextBoxColumn();
            ename.MappingName = "userename";
            ename.HeaderText = "  用户英文名";
            ename.Width = 105;
            dgStyle.GridColumnStyles.Add(ename);

            DataGridColumnStyle cname = new DataGridTextBoxColumn();
            cname.MappingName = "usercname";
            cname.HeaderText = "  用户中文名";
            cname.Width = 105;
            dgStyle.GridColumnStyles.Add(cname);


            DataGridColumnStyle password = new DataGridTextBoxColumn();
            password.MappingName = "password";
            password.HeaderText = "        密码";
            password.Width = 163;
            dgStyle.GridColumnStyles.Add(password);

            this.dgUsers.TableStyles.Add(dgStyle);
            this.txtPassword.Enabled = false;
            this.txtUserCname.Enabled = false;
            this.txtUserEname.Enabled = false;
            this.btnAddUser.Enabled = true;
            this.btnDelUser.Enabled = true;
            this.btnEdit.Enabled = true;
            //this.btnAssignRole.Enabled = true;
            this.btnSave.Enabled = false;
            this.btnClick = BtnClick.SaveClick;
            //默认显示第一行
            if (this.dtUser.Rows.Count > 0)
            {
                this.txtPassword.Text = this.dtUser.Rows[0]["password"].ToString();
                this.txtUserCname.Text = this.dtUser.Rows[0]["usercname"].ToString();
                this.txtUserEname.Text = this.dtUser.Rows[0]["userename"].ToString();
            }
            this.dgUsers.Enabled = true;
        }

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

        private void btnAddKd_Click(object sender, EventArgs e)
        {
            this.dgUsers.Enabled = false;
            //添加用户
            this.btnClick = BtnClick.AddClick;
            this.btnAddUser.Enabled = false;
            this.btnDelUser.Enabled = false;
            this.btnEdit.Enabled = false;
            //this.btnAssignRole.Enabled = false;
            this.btnSave.Enabled = true;

            this.drCurrent = this.dtUser.NewRow();
            this.drCurrent["password"] = "";
            this.drCurrent["usercname"] = "";
            this.drCurrent["userename"] = "";
            this.dtUser.Rows.Add(this.drCurrent);

            this.txtPassword.Text = "";
            this.txtUserCname.Text = "";
            this.txtUserEname.Text = "";
            this.txtPassword.Enabled = true;
            this.txtUserCname.Enabled = true;
            this.txtUserEname.Enabled = true;


            this.dgUsers.Refresh();
        }

        private void btnEditKd_Click(object sender, EventArgs e)
        {
            //编辑用户
            if (this.dgUsers.VisibleRowCount == 0)
                return;
            this.dgUsers.Enabled = false;
            this.btnClick = BtnClick.EditClick;
            this.btnAddUser.Enabled = false;
            this.btnDelUser.Enabled = false;
            this.btnEdit.Enabled = false;
            //this.btnAssignRole.Enabled = false;
            this.btnSave.Enabled = true;

            BindingManagerBase bm;
            bm = this.BindingContext[this.dtUser];
            this.drCurrent = this.dtUser.Rows[bm.Position];
            this.drCurrent["userename"] = "";

            //			this.txtPassword.Enabled = true;
            this.txtUserCname.Enabled = true;
            this.txtUserEname.Enabled = true;	
        }

        private void btnDelKd_Click(object sender, EventArgs e)
        {
            if (this.dgUsers.VisibleRowCount == 0)
                return;
            this.dgUsers.Enabled = false;
            this.btnClick = BtnClick.DelClick;
            this.btnAddUser.Enabled = false;
            this.btnDelUser.Enabled = false;
            this.btnEdit.Enabled = false;
            //this.btnAssignRole.Enabled = false;
            this.btnSave.Enabled = true;

            BindingManagerBase bm;
            bm = this.BindingContext[this.dtUser];
            this.drCurrent = this.dtUser.Rows[bm.Position];
        }

        private void btnSaveKd_Click(object sender, EventArgs e)
        {
            if (this.btnClick == BtnClick.AddClick)
            {
                foreach (DataRow dr in this.dtUser.Rows)
                {
                    if (dr["userename"].ToString().Equals(this.txtUserEname.Text))
                    {
                        MessageBox.Show("此用户英文名在数据库中已存在，请输入另外一个英文名", "警告");
                        this.txtUserEname.Text = "";
                        this.txtUserCname.Text = "";
                        this.txtPassword.Text = "";
                        return;
                    }
                }
                this.drCurrent["password"] = new UserBLC().EncryptPassword(this.txtPassword.Text);
                this.drCurrent["usercname"] = this.txtUserCname.Text;
                this.drCurrent["userename"] = this.txtUserEname.Text;

            }
            if (this.btnClick == BtnClick.EditClick)
            {
                foreach (DataRow dr in this.dtUser.Rows)
                {
                    if (dr["userename"].ToString().Equals(this.txtUserEname.Text))
                    {
                        MessageBox.Show("此用户英文名在数据库中已存在，请输入另外一个英文名", "警告");
                        this.txtUserEname.Text = "";
                        return;
                    }
                }
                this.drCurrent["usercname"] = this.txtUserCname.Text;
                this.drCurrent["userename"] = this.txtUserEname.Text;
            }
            if (this.btnClick == BtnClick.DelClick)
            {
                //设置弹出对话框的模式
                string message = "你真要删除" + "“ " + this.drCurrent["usercname"].ToString() + " ”" + "这个用户吗？ 取消这个操作？";
                string caption = "删除警告                                                                         ";
                MessageBoxButtons buttons = MessageBoxButtons.YesNo;
                DialogResult result;

                //显示对话框
                result = MessageBox.Show(this, message, caption, buttons,
                    MessageBoxIcon.Question, MessageBoxDefaultButton.Button1,
                    MessageBoxOptions.RightAlign);
                //确定删除
                if (result == DialogResult.Yes)
                {
                    //删除选定用户
                    this.drCurrent.Delete();
                }
            }
            //更新数据源
            UserBLC userBlc = new UserBLC();
            userBlc.UpdateUser(this.dsUser);
            //清除存在的数据网格风格
            DataGridTableStyle existingTableStyle = this.dgUsers.TableStyles[0];
            this.dgUsers.TableStyles.Remove(existingTableStyle);
            //重新绑定
            MakeBind();
        }

  
    }
}