WinForm查看SQL Server所有数据库表信息小工具

闲来无事，利用WinForm做了个查看SQL Server所有数据库表信息的小工具。

总结一下：

1、只允许运行应用程序的一个实例

/// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {          
            bool createNew;
            try
            {
                using (System.Threading.Mutex m = new System.Threading.Mutex(true, "Global\\" + Application.ProductName, out createNew))
                {
                    if (createNew)
                    {
                        Application.EnableVisualStyles();
                        Application.SetCompatibleTextRenderingDefault(false);
                        Application.Run(new Form1());
                    }
                    else
                    {
                        MessageBox.Show("Only one instance of this application is allowed!");
                    }
                }
            }
            catch
            {
                MessageBox.Show("只允许运行该应用程序的一个实例!");
            }
        }

2、给ComboBox添加项

        /// <summary>
        /// 选择项类，用于ComboBox或者ListBox添加项
        /// </summary>
        public class ListItem
        {
            public ListItem(string sid, string sname)
            {
                ID = sid;
                Name = sname;
            }
            public override string ToString()
            {
                return this.Name;
            }
            public string ID { get; set; }
            public string Name { get; set; }
        }
//使用：
            cboLoginType.Items.Add(new Comm.ListItem("0", "Windows 身份验证"));
            cboLoginType.Items.Add(new Comm.ListItem("1", "SQL Server 身份验证"));

3、窗体传值

//利用构造方法，LoginFM窗体传值给MainFM窗体

//LoginFM.cs代码:
MainFM f1 = new MainFM(txtServerName.Text.Trim());
f1.Show();

//MainFM.cs代码:
 public MainFM()
{
     InitializeComponent();            
}
public MainFM(string name)
    : this()
{
    serverName = name;
}

4、窗体伸缩时控制窗体内控件按比例自动伸缩

  public MainFM(string name)
            : this()
        {
            serverName = name;           
            SetControlWH(this);
        }
 private void MainFM_Resize(object sender, EventArgs e)
        {
            SetControl2(this);
        }
double formoldwidth;    //窗体原始宽度   
        double formoldheight;   //窗体原始高度 
        private void SetControlWH(Control c)
        {
            double scalewh;     //控件宽高比    
            formoldwidth = (double)this.Width;
            formoldheight = (double)this.Height;
            foreach (Control ctrl in c.Controls)
            {
                scalewh = (double)ctrl.Width / (double)ctrl.Height;
                ctrl.Tag = ctrl.Left + " " + ctrl.Top + " " + ctrl.Width
 + " " + scalewh.ToString() + " ";     //将控件的Left,Top,Width,宽高比放入控件的Tag内
   
                if (ctrl != null)
                    SetControlWH(ctrl);
            }
        }
        private void SetControl2(Control c)
        {
            double scalex;  //水平伸缩比   
            double scaley;  //垂直伸缩比   
            long i;
            int temppos;
            string temptag;
            double[] pos = new double[4];   
//pos数组保存当前控件的left,top,width,height    
            scalex = (double)this.Width / formoldwidth;
            scaley = (double)this.Height / formoldheight;
            foreach (Control ctrl in c.Controls)
            {
                temptag = ctrl.Tag.ToString();
                for (i = 0; i <= 3; i++)
                {
                    temppos = temptag.IndexOf(" ");
                    if (temppos > 0)
                    {
                        pos[i] = Convert.ToDouble(temptag.Substring(0, 
temppos));   //从Tag中取出参数   
                        temptag = temptag.Substring(temppos + 1);
                    }
                    else
                        pos[i] = 0;
                }
                ctrl.Left = (int)(pos[0] * scalex);
                ctrl.Top = (int)(pos[1] * scaley);
                ctrl.Width = (int)(pos[2] * scalex);
                ctrl.Height = (int)((double)ctrl.Width / pos[3]);   
//高度由宽高比算出  
                SetControl2(ctrl);
            }
        }

5、设置DataGridView行变色

 private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
        {
            for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
            {
                if (i % 2 == 0)
                {
                    this.dataGridView1.Rows[i].DefaultCellStyle.BackColor = System.Drawing.SystemColors.Info;//背景颜色
                    this.dataGridView1.Rows[i].DefaultCellStyle.ForeColor = System.Drawing.Color.Green;//字体颜色
                }
                this.dataGridView1.Rows[i].DefaultCellStyle.SelectionBackColor = System.Drawing.Color.Green;//选择行的颜色
            }
        }

6、让TreeView的节点不管有没子节点都默认“+”号：

  private void InitTreeList(DataTable dataTable)
        {
            this.treeView1.ImageIndex = 0;
            TreeNode root = new TreeNode(serverName, 0, 0);
            foreach (System.Data.DataRow row in dataTable.Rows)
            {
                TreeNode node = new TreeNode(row["name"].ToString(),1,1);
                node.Tag = row["name"].ToString();
                //以下生成一个子节点以让节点显示“+”号
                TreeNode n = new TreeNode("n");
                node.Nodes.Add(n);
                root.Nodes.Add(node);
            }
            this.treeView1.Nodes.Add(root);
            this.treeView1.Nodes[0].Expand();
        }
//选择节点时再生成子节点数据 
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
           //其它代码.....
                //点击“+”号生成节点数据时先删除原先的子节点
                if (this.treeView1.SelectedNode.Nodes.Count > 0)
                {
                    this.treeView1.SelectedNode.Nodes.Clear();
                }
           //其它代码.....
       }

7、设置TreeView点击节点前面“+”、“-”号自动选择相应节点

 private void treeView1_AfterExpand(object sender, TreeViewEventArgs e)
        {
            SetSelectNode(e.Node);           
        }
        private void treeView1_AfterCollapse(object sender, TreeViewEventArgs e)
        {
            SetSelectNode(e.Node);   
        }
        private void SetSelectNode(TreeNode tn)
        {
            if (tn == null)
                return;
            if (tn.Tag == null)
                return;
            treeView1.SelectedNode = tn;
        }

8、窗体监听热键

    private void MainFM_Activated(object sender, EventArgs e)
        {       
           HotKey.RegisterHotKey(Handle, 100, HotKey.KeyModifiers.None, Keys.F5);
        }
        private void MainFM_Leave(object sender, EventArgs e)
        {
            HotKey.UnRegisterHotKey(Handle, 100);
        }
        /// <summary>
        /// 监视Windows消息，重载WndProc方法，用于实现热键响应
        /// </summary>
        /// <param name="m"></param>
        protected override void WndProc(ref Message m)
        {
            const int WM_HOTKEY = 0x0312;
            switch (m.Msg)
            {
                case WM_HOTKEY:
                    switch (m.WParam.ToInt32())
                    {
                        case 100:
                            //这里快捷键响应代码                          
                            //......
                            break;
                    }
                    break;
            }
            base.WndProc(ref m);
        }

9、点击窗体右上角“关闭”按钮时最小化并托盘提示信息

/*
(1)在窗体设计界面添加一个NotifyIcon控件notifyIcon1，添加一个ContextMenuStrip控件contextMenuStrip1；
(2)设置notifyIcon1的ContextMenuStrip属性为contextMenuStrip1、为Icon属性添加一个图标文件；
(3)在contextMenuStrip1的Items属性中添加两个菜单选项toolStripMenuItem_Show和toolStripMenuItem_Exit，名称分别为“打开”和“退出”；
下面为事件
*/
 //点击窗体右上角“关闭”按钮时最小化并托盘提示信息
        private void MainFM_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true; // 取消关闭窗体
            this.Hide();
            this.notifyIcon1.Visible = true;//显示托盘图标
            this.notifyIcon1.Text = "打开程序";
            notifyIcon1.ShowBalloonTip(3000, "程序最小化提示", "程序已经缩小到托盘，打开窗口请双击图标即可。", ToolTipIcon.Info);
        }
        //双击打开程序
        private void notifyIcon1_DoubleClick(object sender, EventArgs e)
        {
            ShowForm();
        }
        //右键点击“打开”打开程序
        private void toolStripMenuItem_Show_Click(object sender, EventArgs e)
        {
            ShowForm();
        }
        //右键点击“退出”退出程序
        private void toolStripMenuItem_Exit_Click(object sender, EventArgs e)
        {
            this.ShowInTaskbar = false;
            Application.Exit();
        }
        private void ShowForm()
        {
            this.Show();
            if (this.WindowState == FormWindowState.Minimized)
                this.WindowState = FormWindowState.Normal;
            this.Activate();
        }