C# TreeView從資料庫繫結資料
阿新 • • 發佈:2019-01-29
封裝成一個函式,方便直接呼叫
//繫結TrreView private void InitModuleTree(DataTable dt) { //清空treeview上所有節點 this.tree_Role.Nodes.Clear(); int[] gen = new int[dt.Rows.Count]; //用於儲存父節點Tag int[] zi = new int[dt.Rows.Count]; //用於儲存子節點Tag for (int i = 0; i < gen.Length; i++) { string zhi=dt.Rows[i][3].ToString();//獲取節點Tag值 eg:1-2 if (zhi.Length>1) //表示是子節點 eg:1-2 { gen[i] = int.Parse(zhi.Substring(0, zhi.IndexOf('-'))); zi[i] = int.Parse(zhi.Substring(zhi.IndexOf('-') + 1)); } else //表示是根節點 eg:2 { //將所有父節點加到treeview上 zi[i] =int.Parse(zhi); TreeNode nodeParent = new TreeNode(); nodeParent.Tag = (zi[i]).ToString(); nodeParent.Text = dt.Rows[i][1].ToString(); tree_Role.Nodes.Add(nodeParent); } } bindChildNote(dt,gen,zi); }
//繫結子節點 private void bindChildNote(DataTable dt, int[] gen, int[] zi) { for (int i = 0; i < gen.Length; i++) { if (gen[i] != 0 && zi[i] != 0) //便利所有節點,找到所有子節點 { TreeNode childNode = new TreeNode(); foreach (TreeNode item in tree_Role.Nodes) //便歷treeview上所有父節點 { if (item.Tag.ToString() == gen[i].ToString()) //找到當前子節點的父節點 { childNode.Tag = zi[i].ToString(); childNode.Text = dt.Rows[i][1].ToString(); item.Nodes.Add(childNode); } } } } tree_Role.ExpandAll(); //展開整棵樹 }
資料庫結構:
最終結果:
引用程式碼:
namespace TreeeeeeeeeeeView { public partial class Treeeeeeeeeee : Form { public Treeeeeeeeeee() { InitializeComponent(); //從資料庫獲取資料,得到結果為DataTable SystemManager.Dao.RolePower dao = new SystemManager.Dao.RolePower(); DataSet ds = CommonLib.Dao.CompressUtil.DeCompress(dao.getSystemModule()); DataTable dt = ds.Tables[0]; InitModuleTree(dt); } //繫結TrreView private void InitModuleTree(DataTable dt) { //清空treeview上所有節點 this.tree_Role.Nodes.Clear(); int[] gen = new int[dt.Rows.Count]; //用於儲存父節點Tag int[] zi = new int[dt.Rows.Count]; //用於儲存子節點Tag for (int i = 0; i < gen.Length; i++) { string zhi=dt.Rows[i][3].ToString();//獲取節點Tag值 eg:1-2 if (zhi.Length>1) //表示是子節點 eg:1-2 { gen[i] = int.Parse(zhi.Substring(0, zhi.IndexOf('-'))); zi[i] = int.Parse(zhi.Substring(zhi.IndexOf('-') + 1)); } else //表示是根節點 eg:2 { //將所有父節點加到treeview上 zi[i] =int.Parse(zhi); TreeNode nodeParent = new TreeNode(); nodeParent.Tag = (zi[i]).ToString(); nodeParent.Text = dt.Rows[i][1].ToString(); tree_Role.Nodes.Add(nodeParent); } } bindChildNote(dt,gen,zi); } //繫結子節點 private void bindChildNote(DataTable dt, int[] gen, int[] zi) { for (int i = 0; i < gen.Length; i++) { if (gen[i] != 0 && zi[i] != 0) //便利所有節點,找到所有子節點 { TreeNode childNode = new TreeNode(); foreach (TreeNode item in tree_Role.Nodes) //便歷treeview上所有父節點 { if (item.Tag.ToString() == gen[i].ToString()) //找到當前子節點的父節點 { childNode.Tag = zi[i].ToString(); childNode.Text = dt.Rows[i][1].ToString(); item.Nodes.Add(childNode); } } } } tree_Role.ExpandAll(); //展開整棵樹 } } }