TreeView binding and TreeView binding
Recently, I encountered the TreeView database binding problem. It did take me a few days, especially the step-by-step binding of multi-level nodes. In the first place, I found that all the page loading was stuck, this is really a headache. So let's take a look at what you need, so as not to let everyone go.
1. Only data table
2 given dataset Figure 2 Treeview We can see that node omission occurs here. In general, we can solve the problem from two aspects: on the one hand, we can modify the dataset, and on the other hand, we can modify the Spanning Tree Algorithm. Obviously, directly correcting a dataset is complex and may cause efficiency problems. It is not good to modify the Spanning Tree Algorithm unilaterally (that is, to insert the missing node directly under the r
However, I know that using the corresponding database structure, and then using recursive methods can achieveThe usage of treeview is as follows:The TreeView component is defined by multiple classes, and the TreeView component is named empty.The "TreeView" class in "System. Windows. Forms".The Node
If the tree structure is not filled with data from the database, you do not want to use the "TreeNode" editor,
The following code can be used:
TreeNode RootNode = new TreeNode ();TreeNode SonNode1 = new TreeNode ("Son 1 ");TreeNode SonNode2 = new TreeNode ("Son 2 ");
RootNode. Text = "report statistics ";
RootNode. Nodes. Add ("Node 1 ");RootNode. Nodes. Add ("Node 2 ");RootNode. Nodes. Add ("Node 3 ");
SonNode1.Nodes. Add ("Node 11 ");SonNode1.Nodes. Add ("node 12 ");
SonNode2.Nodes. Add ("Node
, then we set the value of the additional attribute, so that we can process the custom event before the TreeViewHelper event is processed.
Therefore, if it is enabled through the additional property, it is best to write other code in the MouseRightButtonDown processing method. If you want to process in PreviewMouseRightButtonDown, do not use additional properties, but manually call TreeViewHelper. SelectItemByRightClick (treeView ). Then write other p
Traverse the local disk based on the Treeview control, and view the history of the treeview Control
I. Preface
The Treeview control is used to traverse local file information. It is usually used with the Datagridview and ImageList. The ImageList control is used to provide small images to the TreeView control. The Datag
);If (node! = NULL) // right-click the node that is not selected and does not change the selected node. This is true for vs2005.{This. Treeview left. selectednode = node;}}}
Traverse the Treeview node (recursive algorithm)Private void page_load (Object sender, system. eventargs E){Getallnodetext (treeview1.nodes );}Void getallnodetext (treenodecollection TNC){Foreach (treenode node in TNC){If (node. nodes.
that only executes your recursive Code if the action property of the treevieweventargs is not set to treeviewaction. unknown. for an example of how to do this, see the example section of the aftercheck or beforecheck events.
you can change the appearance of the Treeview control by setting some of its display and style properties. setting showplusminu
To be included Code To use the IE Web Control in the class, you must first right-click reference, and then select add referenceMicrosoft. Web. UI. webcontrols. dll Program Centralized. Then, in the class containing the Code, if C # is used, add using Microsoft. Web. UI. webcontrols;If Microsoft Visual Basic. NET is used, add Imports Microsoft. Web. UI. webcontrols.If Visual Studio. NET is not used as the ASP. NET web application Editor, manually add the following @ register command at the top of
Explain the next headline, where I get the data through webservice and load it dynamically into the TreeView node. Then it is not a child node until a node is expanded. Then it does not display the plus sign. This causes the user to mistakenly assume that the node cannot be expanded. I do this, each time you create a node A, the default is that it creates a child node B (just give a name, if it is "hehe"), then the creation of Node A will have child n
, and you can control whether such lines are displayed by setting the Showlines property.
expandlevel=2
The Expandlevel property of this TreeView control is used to determine the number of levels that are expanded along the hierarchy of this TreeView control by default.
---------
Between the opening and closing tags defined by this TreeView control, you can def
TreeView implements the main menu function, and treeview implements the main menuTreeView implements the main menu FunctionIn the MenuItem menu, the software sets various functions and starts corresponding modules. To increase software flexibility, we can also transform the main menu project into a TreeView. By clicking TreeNode in the
control, and you can control whether such lines are displayed by setting the Showlines property.
expandlevel=2
The Expandlevel property of this TreeView control is used to determine the number of levels that are expanded along the hierarchy of this TreeView control by default.
---------
Between the opening and closing tags defined by this TreeView
The following section describes how to use the temporary view function to implement the treeview, but not the data that has not been added to the SQL view.Protected void Page_Load (object sender, EventArgs e){This. TreeView1.Nodes. Clear (); // Clear all vertices of the treeview firstMaketree (); // generate a treeviewTreeView1.DataBind (); // set data size}
Protected void maketree (){TreeNode RootNode; //
two nodes in a TreeView control, and you can control whether such lines are displayed by setting the Showlines property.expandlevel=2The Expandlevel property of this TreeView control is used to determine the number of levels that are expanded along the hierarchy of this TreeView control by default.---------Between the opening and closing tags defined by this
can control whether to display such lines.Expandlevel = 2The expandlevel attribute of the Treeview control is used to determine the number of levels that are expanded along the hierarchy of the Treeview control by default.---------You can define some treenode controls between the start and end labels defined by the Treeview control.
2. Use the treenode control i
the showlines attribute, you can control whether to display such lines.
Expandlevel = 2
The Expandlevel attribute of the Treeview control is used to determine the number of levels that are expanded along the hierarchy of the treeview control by default.
---------
You can define some treenode controls between the start and end labels defined by the treeview contr
In winformProgramIn, we sometimes use the Treeview control as the navigation bar of the system (Figure 1). These treenode items are usually dynamically generated based on user permissions, in this case, how can we better handle the treenode click event? (Click, DoubleClick, etc)
Figure 1
In treenode, there is a tag attribute with the type of object. Usually I will skillfully use this tag to process the above click events. BecauseCodeCode 1 defi
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.