Microsoft treeview .net

Calls the DataBind method of the base class. Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. Determines whether the server control contains child controls. If it does not, it creates child controls. Calls the DataBind method if the DataSourceID property is set and the data-bound control is marked to require binding. Searches the current naming container for a server control with the specified id parameter. Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search.

You should not override this version of the FindControl method. Retrieves the TreeNode object in the TreeView control at the specified value path. Retrieves a HierarchicalDataSourceView object that the data-bound control uses to perform data operations. Retrieves the IHierarchicalDataSource that the data-bound control is associated with, if any.

Gets the Type of the current instance. Returns the prefixed portion of the UniqueID property of the specified control. Restores control-state information from a previous page request that was saved by the SaveControlState method. Processes postback data for the TreeView control.

Loads the previously saved view state of the TreeView control. Creates a shallow copy of the current Object. Copies any nonblank elements of the specified style to the Web control, but will not overwrite any existing style elements of the control. Determines whether the event for the server control is passed up the page's UI server control hierarchy.

Raises the DataBinding event. Raises the DataBound event. Called when one of the base data source identification properties is changed, to re-bind the data-bound control to its data. Raises the Init event. Handles the Load event. Raises the PreRender event. Raises the Unload event. Gets a Stream used to read a file. Enables the TreeView control to process an event that is raised when a form is posted to the server.

RaiseCallbackEvent String method. NET application that the state of the control has changed. Called after a child control is removed from the Controls collection of the Control object.

Outputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client. Renders the nodes in the TreeView control.

Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled. Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object.

Saves any server control state changes that have occurred since the time the page was posted back to the server. Saves the state of the TreeView control. Allows a derived class to set whether the specified TreeNode control is data-bound. Allows a derived class to set the data item for the specified TreeNode control.

Allows a derived class to set the data path for the specified TreeNode control. Assigns an event handler delegate to render the server control and its content into its parent control. Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value.

Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value. Tracks view-state changes to the TreeView control so that they can be stored in the StateBag object for the control.

This StateBag is accessible through the ViewState property. Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.

NET page is requested. Occurs when the server control is loaded into the Page object. Occurs after the Control object is loaded but prior to rendering. Occurs when a node is selected in the TreeView control. Occurs when a check box in the TreeView control changes state between posts to the server. Occurs when a node is collapsed in the TreeView control. Occurs when a data item is bound to a node in the TreeView control.

Occurs when a node is expanded in the TreeView control. Occurs when a node with its PopulateOnDemand property set to true is expanded in the TreeView control. For a description of this member, see ControlBuilder.

For a description of this member, see GetDesignModeState. For a description of this member, see SetOwnerControl Control. For a description of this member, see UserData. For a description of this member, see DataBindings. For a description of this member, see HasDataBindings. For a description of this member, see Expressions. For a description of this member, see HasExpressions. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode.

Tree View Class Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System. WebControls Assembly: System. Displays hierarchical data, such as a table of contents, in a tree structure. Note Some Internet browsers have a limitation that can affect the performance of the TreeView control. Important A malicious user can create a callback request and get data for the nodes of the TreeView control that the page developer is not displaying.

Note If a style is defined for a certain depth level using the LevelStyles collection, that style overrides any root, parent, or leaf node style settings for the nodes at that depth.

Note You do not need to customize every image property. In this article. The URL to an image displayed for the collapsible node indicator. This image is usually a minus sign -. The URL to an image displayed for the expandable node indicator. The URL to the folder containing the line images used to connect parent nodes to child nodes. The ShowLines property must also be set to true for this property to have an effect.

Occurs when the check boxes of the TreeView control change state between posts to the server. Gets or sets the access key that allows you to quickly navigate to the Web server control. Inherited from WebControl. Gets the browser-specific adapter for the control. Inherited from Control. Gets or sets the background color of the Web server control.

Gets the control that contains this control's data binding. Gets or sets the border color of the Web control. Gets or sets the border style of the Web server control. Gets or sets the border width of the Web server control. Gets a value that indicates whether the server control's child controls have been created.

Gets or sets the ToolTip for the image that is displayed for the collapsible node indicator. Gets or sets the URL to a custom image for the collapsible node indicator. Gets the style of the Web server control. This property is used primarily by control developers. Gets or sets the object from which the data-bound control retrieves its list of data items.

Inherited from BaseDataBoundControl. Inherited from HierarchicalDataBoundControl. Gets a value indicating whether a control is being used on a design surface. Gets or sets a value indicating whether the Web server control is enabled. Gets or sets a value indicating whether themes apply to this control. Gets a list of event handler delegates for the control. This property is read-only. Gets or sets the ToolTip for the image that is displayed for the expandable node indicator.

Gets or sets the URL to a custom image for the expandable node indicator. Gets the font properties associated with the Web server control.

Gets or sets the foreground color typically the color of the text of the Web server control. Gets a value indicating whether the control has attributes set. Gets or sets the height of the Web server control.

Gets or sets the programmatic identifier assigned to the server control. Gets the character used to separate control identifiers. Gets a value indicating whether the data-bound control has been initialized.

Gets a value indicating whether controls contained within this control have control state. Gets a value that indicates whether data binding is automatic. Gets a value indicating whether the control is enabled.

Gets a value that indicates whether the server control is saving changes to its view state. Gets a value indicating whether view state is enabled for this control. Gets or sets a value indicating whether text wraps in a node when the node runs out of space. Gets or sets the URL to a custom image for the non-expandable node indicator.

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. With the Windows Forms TreeView control, you can display a hierarchy of nodes to users, like the way files and folders are displayed in the left pane of the Windows Explorer feature of the Windows operating system.

Each node in the tree view might contain other nodes, called child nodes. You can display parent nodes, or nodes that contain child nodes, as expanded or collapsed. You can also display a tree view with check boxes next to the nodes by setting the tree view's CheckBoxes property to true.

You can then programmatically select or clear nodes by setting the node's Checked property to true or false. NET , the popular web development framework that extends the. NET developer platform with tools and libraries for building web apps. Blazor can run your client-side C code directly in the browser, using WebAssembly. Because it's real. NET running on WebAssembly, you can re-use code and libraries from server-side parts of your application.

Alternatively, Blazor can run your client logic on the server. Client UI events are sent back to the server using SignalR - a real-time messaging framework. Using the DOM, elements can be updated, added, and removed from the page. Blazor uses open web standards without plug-ins or code transpilation. Tooltip: Transpilation is the process of converting code written in one programming language to another. Transpilation to JavaScript is a common approach to enabling languages to run in the browser, but often provides limited functionality.

Blazor works in all modern web browsers, including mobile browsers. Code running in the browser executes in the same security sandbox as JavaScript frameworks. Blazor code executing on the server has the flexibility to do anything you would normally do on the server, such as connecting directly to a database. Blazor apps can use existing. NET libraries, thanks to. NET Standard —a formal specification of. NET implementations.