C#中如何定义内存表绑定DataGrid的简单实例

zoukankan html css js c++ java

C#中如何定义内存表绑定DataGrid的简单实例

实例代码如下：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

namespace ListViewDemo
...{
    /**//// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class DemoForm : System.Windows.Forms.Form
    ...{
        private System.Windows.Forms.ListView lvw;
        private System.Windows.Forms.ImageList ilsLargeIcons;
        private System.Windows.Forms.ImageList ilsSmallIcons;
        private System.Windows.Forms.ComboBox cboView;
        private System.Windows.Forms.ColumnHeader columnHeader1;
        private System.Windows.Forms.ColumnHeader columnHeader2;
        private System.Windows.Forms.ColumnHeader columnHeader3;
        private System.Windows.Forms.ColumnHeader columnHeader4;
        private System.Windows.Forms.ColumnHeader columnHeader5;
        private System.Windows.Forms.ColumnHeader columnHeader6;
        private System.ComponentModel.IContainer components;
        private System.Windows.Forms.Button btnUse;
        private System.Windows.Forms.Button btnLeave;

        private ListViewItem itmX;
        private System.Windows.Forms.Button btnStat;
        const int MoneyPerHour=2;

        public DemoForm()
        ...{
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /**//// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        ...{
            if( disposing )
            ...{
                if (components != null)
                ...{
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        ...{
            Application.Run(new DemoForm());
        }

        private void DemoForm_Load(object sender, System.EventArgs e)
        ...{
            lvw.SmallImageList=ilsSmallIcons;
            for (int i=1;i<=30;i++)
            ...{
                itmX=lvw.Items.Add(i.ToString(),0);  //Add方法返回新增的ListViewItem对象
                itmX.SubItems.Add("未使用");
                itmX.SubItems.Add("");
                itmX.SubItems.Add("");
                itmX.SubItems.Add("");
                itmX.SubItems.Add("");

            }

            cboView.SelectedIndex=1;
        }

        private void cboView_SelectedIndexChanged(object sender, System.EventArgs e)
        ...{
            lvw.View=(View)cboView.SelectedIndex;
        }

        private void btnUse_Click(object sender, System.EventArgs e)
        ...{
            if (lvw.SelectedItems.Count>0)
            ...{
                itmX=lvw.SelectedItems[0];
                if (MessageBox.Show("确定使用" + itmX.Text + "号计算机吗？","提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Question)==DialogResult.OK)
                ...{
                    itmX.SubItems[2].Text=DateTime.Now.ToString();
                    itmX.SubItems[1].Text="使用中";
                    itmX.ImageIndex=1;
                    itmX.SubItems[3].Text="";
                    itmX.SubItems[4].Text="";
                    itmX.SubItems[5].Text="";
                    lvw_SelectedIndexChanged(lvw,EventArgs.Empty);
                }
            }
        }

        private void btnLeave_Click(object sender, System.EventArgs e)
        ...{
            if (lvw.SelectedItems.Count>0)
            ...{
                itmX=lvw.SelectedItems[0];
                if (MessageBox.Show("确定不再使用" + itmX.Text + "号计算机吗？","提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Question)==DialogResult.OK)
                ...{
                    itmX.SubItems[3].Text=DateTime.Now.ToString();
                    itmX.SubItems[1].Text="未使用";
                    itmX.ImageIndex=0;
                    TimeSpan ts=DateTime.Now-DateTime.Parse(itmX.SubItems[2].Text);
                    itmX.SubItems[4].Text=ts.Hours + "小时" + ts.Minutes + "分";

                    int hours=ts.Hours;
                    if (ts.Minutes>0) hours++;//不足一小时按一小时计算

                    itmX.SubItems[5].Text=hours*MoneyPerHour + "元";

                    lvw_SelectedIndexChanged(lvw,EventArgs.Empty);
                    SqlConnection cn=DBOperate.GetConnection();
                    try
                    ...{
                        cn.Open();
                        SqlCommand cmd=new SqlCommand("Insert into UsingDetails Values(@ComputerNo, @StartTime, @EndTime, @TotalMoney)",cn);
                        cmd.Parameters.Add("@ComputerNo",int.Parse(itmX.Text));
                        cmd.Parameters.Add("@StartTime",DateTime.Parse(itmX.SubItems[2].Text));
                        cmd.Parameters.Add("@EndTime",DateTime.Now);
                        cmd.Parameters.Add("@TotalMoney",(decimal)(hours*MoneyPerHour));
                        cmd.ExecuteNonQuery();
                    }
                    finally
                    ...{
                        cn.Close();
                    }
                }
            }
        }

        private void btnStat_Click(object sender, System.EventArgs e)
        ...{
            StatForm frmStat=new StatForm();
            frmStat.ShowDialog();
        }

        private void lvw_SelectedIndexChanged(object sender, System.EventArgs e)
        ...{
            if (lvw.SelectedItems.Count>0)
            ...{
                if (lvw.SelectedItems[0].ImageIndex==0)
                ...{
                    btnUse.Enabled=true;
                    btnLeave.Enabled=false;
                }
                else
                ...{
                    btnUse.Enabled=false;
                    btnLeave.Enabled=true;
                }
            }
        }
    }
}

这个实例基本上包含了ListView常用方法和属性，最主要的就是要明白ListView中包含的都是ListViewItem对象。

查看全文

相关阅读:
vue-指令
 VueMusic-14搜索实现
 VueMusic-13歌手列表
 VueMusic-12歌词滚动
 VueMusic-11播放-歌词适配
 VueMusic-10.播放-歌词加载
 VueMusic-9.播放-播放功能
 VueMusic-8更多-下拉刷新
 VueMusic-7更多-数据适配
 VueMusic-6首页-热门榜单

原文地址：https://www.cnblogs.com/chenbg2001/p/1351887.html