Hotel management system-winform-C#-three-layer mode (1: user operation page of the presentation layer)_html/css_WEB-ITnose

I have always wanted to try a three-tier architecture. But I haven't done it yet, subconsciously I always feel that I am not strong enough. What is something as high-end as a three-tier architecture, something that a simpleton like me can get?

This time I finally mustered up the courage to do it slowly. The most I can do is spend more time checking Baidu, right?

First of all, give yourself a refresher on the three-tier architecture:

What is three-tier? Three-tier architecture (3-tier architecture) The three-tier architecture in the usual sense divides the entire business application into: presentation layer (Presentation layer), business logic layer (Business Logic Layer), and data access layer (Data access layer). The purpose of distinguishing levels is the idea of ​​"high cohesion and low coupling". In software architecture design, the hierarchical structure is the most common and important structure. The layered structure recommended by Microsoft is generally divided into three layers, from bottom to top: data access layer, business logic layer (also called domain layer), and presentation layer.

This is how I understand it: the presentation layer is almost the interface we see = event

The logic layer is almost the way we implement events = method

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　= SQL statement for adding, deleting, checking and modifying the database

Let me try to build a hotel management system.

Step one:

As a high-end hotel management system. So this is not something that anyone who wants to see can see or operate. We need to make a landing page. Outsiders? Haha, let’s verify it first!

The login page interface is ready. The rest is the operation page;

I am also bold about the presentation layer. I made a UI

and wanted to call different interactive pages through extensions.

The following is the main code of the UI:

 1   /// <summary> 2         /// 菜?????展? 3         ///  4         /// </summary> 5         /// <param name="sender"></param> 6         /// <param name="e"></param> 7         private void pictureBox1_Click(object sender, EventArgs e) 8         { 9             if (pictureBox1.Location.X < 0)10             {11                 this.pictureBox1.Location = new System.Drawing.Point(210, 48);12                 this.tabControl1.Location = new System.Drawing.Point(221, 48);13                 this.tabControl1.Size -= new Size(209, 0);14                 this.treeView1.Visible = true;15                 //this.pictureBox1.AccessibleDescription = "??菜?";16             }17             else18             {19                 this.pictureBox1.Location = new System.Drawing.Point(-10, 48);20                 this.tabControl1.Location = new System.Drawing.Point(12, 48);21                 this.tabControl1.Size += new Size(209,0); 22                 this.treeView1.Visible = false;23             }24         }

 1  /// <summary> 2         /// 工具?-?算器 3         /// </summary> 4         /// <param name="sender"></param> 5         /// <param name="e"></param> 6         private void ?算器ToolStripMenuItem_Click(object sender, EventArgs e) 7         { 8             Thread t0 = new Thread(BlackCatHotelManagerBLL.HotelManager.calc); 9             t0.Start();10         }11         //private System.Object lockThis = new System.Object();12         13 14         /// <summary>15         /// 工具?-?事本16         /// </summary>17         /// <param name="sender"></param>18         /// <param name="e"></param>19         private void ?事本ToolStripMenuItem_Click(object sender, EventArgs e)20         {21             Thread t1 = new Thread(BlackCatHotelManagerBLL.HotelManager.notepad);22             t1.Start();23         }

to be continued. . .