{"id":59373,"date":"2024-10-12T21:33:16","date_gmt":"2024-10-12T13:33:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/59373\/"},"modified":"2024-10-12T21:33:16","modified_gmt":"2024-10-12T13:33:16","slug":"asp-net%e4%b8%8b%e7%9a%84treeview%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e7%b6%81%e5%ae%9a%ef%bc%9f-treeview-%e7%b6%81%e5%ae%9a%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/59373\/","title":{"rendered":"ASP.NET\u4e0b\u7684TreeView\u5982\u4f55\u5be6\u73fe\u6578\u64da\u5eab\u7684\u7d81\u5b9a\uff1f (treeview \u7d81\u5b9a\u6578\u64da\u5eab)"},"content":{"rendered":"

ASP.NET\u4e0b\u7684TreeView\u5982\u4f55\u5be6\u73fe\u6578\u64da\u5eab\u7684\u7d81\u5b9a\uff1f<\/h1>\n

\u5728\u73fe\u4ee3Web\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6a39\u72c0\u8996\u5716\uff08TreeView\uff09\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u7528\u6236\u754c\u9762\u7d44\u4ef6\uff0c\u7279\u5225\u9069\u5408\u7528\u65bc\u986f\u793a\u5c64\u6b21\u7d50\u69cb\u7684\u6578\u64da\u3002ASP.NET\u63d0\u4f9b\u4e86\u5f37\u5927\u7684TreeView\u63a7\u4ef6\uff0c\u80fd\u5920\u8f15\u9b06\u5730\u5c07\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u7d81\u5b9a\u5230\u6a39\u72c0\u7d50\u69cb\u4e2d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728ASP.NET\u4e2d\u5be6\u73feTreeView\u7684\u6578\u64da\u5eab\u7d81\u5b9a\uff0c\u4e26\u63d0\u4f9b\u5177\u9ad4\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

TreeView\u63a7\u4ef6\u6982\u8ff0<\/h2>\n

ASP.NET\u7684TreeView\u63a7\u4ef6\u662f\u4e00\u500b\u7528\u65bc\u986f\u793a\u6a39\u72c0\u7d50\u69cb\u7684\u63a7\u4ef6\uff0c\u901a\u5e38\u7528\u65bc\u5c0e\u822a\u6216\u986f\u793a\u5c64\u6b21\u7d50\u69cb\u7684\u6578\u64da\u3002\u5b83\u652f\u6301\u591a\u7a2e\u5c6c\u6027\u548c\u4e8b\u4ef6\uff0c\u5141\u8a31\u958b\u767c\u8005\u81ea\u5b9a\u7fa9\u5176\u5916\u89c0\u548c\u884c\u70ba\u3002TreeView\u63a7\u4ef6\u7684\u6bcf\u500b\u7bc0\u9ede\u90fd\u53ef\u4ee5\u5305\u542b\u5b50\u7bc0\u9ede\uff0c\u9019\u4f7f\u5f97\u5b83\u975e\u5e38\u9069\u5408\u7528\u65bc\u986f\u793a\u5982\u6587\u4ef6\u7cfb\u7d71\u3001\u7d44\u7e54\u7d50\u69cb\u5716\u7b49\u5c64\u6b21\u6578\u64da\u3002<\/p>\n

\u6578\u64da\u5eab\u8a2d\u8a08<\/h2>\n

\u5728\u958b\u59cb\u7d81\u5b9a\u6578\u64da\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u8a2d\u8a08\u4e00\u500b\u7c21\u55ae\u7684\u6578\u64da\u5eab\u7d50\u69cb\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cCategories\u201d\u7684\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n

\nCREATE TABLE Categories (\n    Id INT PRIMARY KEY,\n    Name NVARCHAR(100),\n    ParentId INT NULL\n);\n<\/pre>\n
\u5728\u9019\u500b\u8868\u4e2d\uff0c`Id`\u662f\u6bcf\u500b\u985e\u5225\u7684\u552f\u4e00\u6a19\u8b58\u7b26\uff0c`Name`\u662f\u985e\u5225\u7684\u540d\u7a31\uff0c\u800c`ParentId`\u5247\u7528\u65bc\u8868\u793a\u8a72\u985e\u5225\u7684\u7236\u985e\u5225\u3002\u5982\u679c`ParentId`\u70baNULL\uff0c\u5247\u8868\u793a\u8a72\u985e\u5225\u662f\u6839\u985e\u5225\u3002<\/p>\n
\u6578\u64da\u5eab\u9023\u63a5<\/h2>\n
\u5728ASP.NET\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528ADO.NET\u4f86\u9023\u63a5\u6578\u64da\u5eab\u4e26\u7372\u53d6\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6578\u64da\u5eab\u9023\u63a5\u793a\u4f8b\uff1a<\/p>\n
\nusing System;\nusing System.Data;\nusing System.Data.SqlClient;\n\npublic class DatabaseHelper {\n    private string connectionString = \"your_connection_string_here\";\n\n    public DataTable GetCategories() {\n        DataTable dt = new DataTable();\n        using (SqlConnection conn = new SqlConnection(connectionString)) {\n            conn.Open();\n            SqlCommand cmd = new SqlCommand(\"SELECT * FROM Categories\", conn);\n            SqlDataAdapter da = new SqlDataAdapter(cmd);\n            da.Fill(dt);\n        }\n        return dt;\n    }\n}\n<\/pre>\n
\u7d81\u5b9a\u6578\u64da\u5230TreeView<\/h2>\n
\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u9700\u8981\u5c07\u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u7684\u6578\u64da\u7d81\u5b9a\u5230TreeView\u63a7\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u4ee3\u78bc\uff0c\u5c55\u793a\u5982\u4f55\u5be6\u73fe\u9019\u4e00\u904e\u7a0b\uff1a<\/p>\n
\nusing System;\nusing System.Data;\nusing System.Web.UI.WebControls;\n\npublic partial class TreeViewExample : System.Web.UI.Page {\n    protected void Page_Load(object sender, EventArgs e) {\n        if (!IsPostBack) {\n            BindTreeView();\n        }\n    }\n\n    private void BindTreeView() {\n        DatabaseHelper dbHelper = new DatabaseHelper();\n        DataTable categories = dbHelper.GetCategories();\n        TreeNode rootNode = new TreeNode(\"\u6839\u985e\u5225\");\n        TreeView1.Nodes.Add(rootNode);\n        AddChildNodes(rootNode, categories);\n    }\n\n    private void AddChildNodes(TreeNode parentNode, DataTable categories) {\n        foreach (DataRow row in categories.Rows) {\n            if (row[\"ParentId\"] == DBNull.Value) {\n                TreeNode newNode = new TreeNode(row[\"Name\"].ToString());\n                parentNode.ChildNodes.Add(newNode);\n                AddChildNodes(newNode, categories);\n            }\n        }\n    }\n}\n<\/pre>\n
\u7e3d\u7d50<\/h2>\n
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\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684ASP.NET\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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