[英]Binding the database data to tree view using c# in winforms applications
我有一个名为类别的表....带有列...
category_id
categoryname
我只想在树形视图中表示类别名称....
是否可以像这样将类别名称绑定到树视图...
Category
categoryname 1
categoryname 2
categoryname 3
是否有可能使用C#..我正在使用Windows应用程序....
任何人都可以帮忙...
提前谢谢了..
在更多的Web表单中,您可以简单地将数据集绑定到Treeview控件,但在Win表单中,则没有任何数据。 在此示例中,我继承了System.Windows.Forms.TreeView类,并编写了自己的代码以将数据集绑定到Win Treeview控件,并且在我的应用程序中使用了3年以上,并且效果很好。
首先:您必须将类创建为Custom_Tree_View.cs并在其中添加以下代码
public class Custom_Tree_View : System.Windows.Forms.TreeView
{
DataSet dsMenu = new DataSet();
public TreeNodeMouseClickEventHandler TreeNode_Click_Event;
float FontSize = 9F;
string FontName = "Tahoma";
public string Data_Key_Member;
public string Data_Key_Value;
private ImageList imageList1;
private System.ComponentModel.IContainer components;
public string Data_Parent_Key;
public bool ShowCheckBox = false;
public Custom_Tree_View()
{
this.Font = new System.Drawing.Font(this.FontName, this.FontSize);
this.NodeMouseClick += NodeMouseClicked;
}
public void CreateMenu(DataSet _dsMenu)
{
try
{
this.Nodes.Clear();
if (_dsMenu == null) return;
this.CheckBoxes = this.ShowCheckBox;
this.dsMenu = _dsMenu;
string Filter = this.Data_Parent_Key + " IS NULL";
foreach (DataRow drTemp in dsMenu.Tables[0].Select(Filter))
{
Create_Parent_Tree_Node(drTemp[0].ToString());
}
}
catch (Exception ex)
{
throw ex;
}
}
private void Create_Parent_Tree_Node(string strMenu)
{
try
{
TreeNode mmru = new TreeNode(GetMenu_Details_Title(strMenu));
mmru.Name = strMenu;
if (dsMenu.Tables[0].Select(this.Data_Parent_Key + "='" + strMenu + "'").Length > 0)
{
this.Nodes.Add(mmru);
foreach (DataRow drTemp in dsMenu.Tables[0].Select(this.Data_Parent_Key + "='" + strMenu + "'"))
{
Create_Child_Tree_Node(mmru, drTemp[0].ToString());
}
}
else
{
mmru.ForeColor = System.Drawing.Color.Red;
this.Nodes.Add(mmru);
}
}
catch (Exception ex)
{
throw ex;
}
}
private string Create_Child_Tree_Node(TreeNode mnuItem, string strMenu)
{
try
{
if (dsMenu.Tables[0].Select(this.Data_Parent_Key + "='" + strMenu + "'").Length > 0)
{
TreeNode mmru = new TreeNode(GetMenu_Details_Title(strMenu));
mmru.Name = strMenu;
mnuItem.Nodes.Add(mmru);
foreach (DataRow drTemp1 in dsMenu.Tables[0].Select(this.Data_Parent_Key + "='" + strMenu + "'"))
{
Create_Child_Tree_Node(mmru, drTemp1[0].ToString());
}
}
else
{
TreeNode mmru = new TreeNode(GetMenu_Details_Title(strMenu));
mmru.Name = strMenu;
mmru.ForeColor = System.Drawing.Color.Red;
mnuItem.Nodes.Add(mmru);
return strMenu;
}
return strMenu;
}
catch (Exception ex)
{
throw ex;
}
}
private string GetMenu_Details_Title(string TreeNode_ID)
{
try
{
return dsMenu.Tables[0].Select(this.Data_Key_Value + "=" + TreeNode_ID + "")[0][this.Data_Key_Member].ToString();
}
catch (Exception ex)
{
throw ex;
}
}
private bool GetMenuEnable(string TreeNode_ID)
{
try
{
if (dsMenu.Tables[0].Select(this.Data_Key_Value + "='" + TreeNode_ID + "'")[0][3].ToString() == "Y")
return true;
else
return false;
}
catch (Exception ex)
{
throw ex;
}
}
public TreeNode SelectedTreeNode;
private void NodeMouseClicked(object sender, TreeNodeMouseClickEventArgs e)
{
try
{
if (dsMenu.Tables[0].Select(this.Data_Parent_Key + "='" + e.Node.Name + "'").Length > 0)
{
return;
}
else
{
if (this.TreeNode_Click_Event != null)
TreeNode_Click_Event(sender, e);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.imageList1 = new System.Windows.Forms.ImageList(this.components);
this.SuspendLayout();
//
// imageList1
//
this.imageList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
//
// Custom_Tree_View
//
this.Font = new System.Drawing.Font("Tahoma", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(178)));
this.ItemHeight = 25;
this.LineColor = System.Drawing.Color.Black;
this.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
this.RightToLeftLayout = true;
this.NodeMouseClick += new System.Windows.Forms.TreeNodeMouseClickEventHandler(this.Custom_Tree_View_NodeMouseClick);
this.ResumeLayout(false);
}
private void Custom_Tree_View_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
try
{
if (e.Node.Checked == true)
{
foreach (TreeNode Node in e.Node.Nodes)
{
Node.Checked = true;
}
}
if (e.Node.Checked == false)
{
foreach (TreeNode Node in e.Node.Nodes)
{
Node.Checked = false;
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
第二:
在您的项目中,将New Control添加到窗体上,并在下面的代码中将数据集绑定到treeview控件
DataSet Menu_Ds = new DataSet();
Menu_Ds = GetMyDataSet();
this.custom_Tree_View_Menu.Data_Key_Member = "Menu_Details_Title";
this.custom_Tree_View_Menu.Data_Key_Value ="Menu_Details_Id";
this.custom_Tree_View_Menu.Data_Parent_Key = "Menu_Details_Parent";
this.custom_Tree_View_Menu.CreateMenu(Menu_Ds);
注意:在数据集中,您必须具有树字段“标题”,“ ID”和“ Parent_Id”字段才能正确创建树视图
我希望这篇文章对所有人都有用,对于我的英语不好,我感到抱歉
这是使用标准树视图控件在Windows窗体中无法实现的,但这是可行的。
最好的方法是从TreeView
派生您自己的控件,创建DataSource
属性。 分配DataSource
您的控件应基于数据构建其结构。 您可能需要一些其他属性来描述具有节点文本的列以及具有ID和父ID的列。
如果要使用更完整的方法,还应该考虑向DataSource
对象订阅一些其他事件,并对DataSource事件更改做出反应。
有趣的设计决策是您要一次构建整棵树还是等待用户扩展给定节点。
您还可以在CodeProject上找到至少两个工作示例:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
MenuDS ds = new MenuDS();
CategoryTableAdapter daCategory = new CategoryTableAdapter();
ProductTableAdapter daProduct = new ProductTableAdapter();
daCategory.Fill(ds.Category);
daProduct.Fill(ds.Product);
if (ds.Tables[0].Rows.Count > 0)
{
TreeView1.Nodes.Clear();
foreach (DataRow dr in ds.Category.Rows)
{
TreeNode mastreNode = new TreeNode(dr["cateNAme"].ToString(), dr["Id"].ToString());
TreeView1.Nodes.Add(mastreNode);
TreeView1.CollapseAll();
DataTable dt = daProduct.GetDataBy(Convert.ToInt32((dr["Id"])));
foreach (DataRow drNew in dt.Rows)
{
TreeNode childNode = new TreeNode(drNew["prodName"].ToString(), drNew["Id"].ToString());
childNode.NavigateUrl = "~/ProductDetails.aspx?Id=" + drNew["Id"].ToString();
mastreNode.ChildNodes.Add(childNode);
}
}
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.