Use treeview tree menu bar (recursively call database to create menu automatically)

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When doing industrial control PC project , When the project is too big , There are a lot of subdivision processes , The number of pages that need to be managed will also increase a lot , You can use .NET Control TreeView Page switch management , And realize TreeView Between the mutual switch .Intouch and Wonderware You can import and use TreeView Control .

When doing industrial control PC project , When the project is too big , There are a lot of subdivision processes , The number of pages that need to be managed will also increase a lot , You can use .NET Control TreeView Page switch management , And realize TreeView Between the mutual switch .Intouch and Wonderware You can import and use TreeView Control .

One 、 Use VS Development TreeView Control

Create a control project solution

Drag one TreeView Control , You can simply edit nodes

Tag It's data that needs to be passed out

Two 、 What happened

At the end of the project , The other party will put forward a lot of improvement needs , At this point, if there are too many TreeView Control , Every time we improve , For the upper computer system, it needs to import again , There's too much repetition , Too complicated .

Solution ： Create menu table in database , The menu bar is automatically generated when the project is running

3、 ... and 、 Create database

Create database tables ,MenuId It's the menu number ,MenuName by TreeView The name of the page displayed ,MenuCode by Tag,ParentId This node is the root of the node

Four 、 Write code and generate it automatically

According to the two-tier architecture

 

  Entity class TreeViewNode

1 public class TreeViewNode 2  { 3   public int MenuId { get; set; } 4  5   public string MenuName { get; set; } 6  7   public string MenuCode { get; set; } 8  9   public string ParentId { get; set; }10  }

Service layer ：MenuService

1   /// <summary> 2   ///  Get all the menu items  3   /// </summary> 4   /// <returns></returns> 5   public List<TreeViewNode> GetAllMenu() 6   { 7    string sql = "select MenuId,MenuName,MenuCode,ParentId from MenuList"; 8    List<TreeViewNode> nodeList = new List<TreeViewNode>(); 9    SqlDataReader objRead = SQLHelper.GetReader(sql);10    while (objRead.Read())11    {12     nodeList.Add(new TreeViewNode()13     {14      MenuId = Convert.ToInt32(objRead["MenuId"]),15      MenuName = objRead["MenuName"].ToString(),16      MenuCode = objRead["MenuCode"].ToString(),17      ParentId = objRead["ParentId"].ToString()18     });19    }20    objRead.Close();21    return nodeList;22   }

TreeViewMenu Control ：

1 public partial class TreeViewMenu: UserControl 2  { 3   public TreeViewMenu() 4   { 5    InitializeComponent(); 6    Lo.........