TreeNodeBinding.ValueField Property
Assembly: System.Web (in system.web.dll)
[TypeConverterAttribute(L"System.Web.UI.Design.DataSourceViewSchemaConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] public: property String^ ValueField { String^ get (); void set (String^ value); }
/** @property */ public String get_ValueField () /** @property */ public void set_ValueField (String value)
public function get ValueField () : String public function set ValueField (value : String)
Not applicable.
Property Value
The name of the field to bind to the Value property of a TreeNode object to which the TreeNodeBinding object is applied. The default is an empty string (""), which indicates that the ValueField property is not set.When the TreeView control is bound to a data source, use the ValueField property to specify the field name to bind to the Value property of a TreeNode object. This binding relationship affects all TreeNode objects to which the TreeNodeBinding object is applied. The Value property is used to supplement the Text property by storing any additional data associated with the node to which the TreeNodeBinding object is applied. This value is not displayed in the control and is commonly used to store data for handling postback events.
Note: |
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| You can selectively override the ValueField property by setting the Value property of each node directly. |
Instead of using the ValueField property to bind the Value property of a TreeNode object to an field, you can set the Value property to a fixed value by setting the Value property.
Note: |
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| If the data source contains multiple fields, you must first set the Depth or DataMember property, or both properties in order to bind to the appropriate field. |
The value of this property is stored in view state.
This section contains two code examples. The first code example demonstrates how to use the ValueField property to specify which attribute of an XML element to bind to the Value property of a TreeNode object to which the TreeNodeBinding object is applied. The second code example provides sample XML data for the first code example.
The following example demonstrates how to use the ValueField property to specify which attribute of an XML element to bind to the Value property of a TreeNode object to which the TreeNodeBinding object is applied. For this example to work correctly, you must copy the sample XML data, provided after this code example, to a file named Booklist.xml.
The following code example provides sample XML data for the preceding code example.
<Books Text="Books List">
<Book Text="Book Title One"
Value="1"
Image="Bookimage1.jpg"
ImageToolTip="Book 1 Photo"
Nav="http://www.microsoft.com"
Tip="Book Title 1">
<Description Text="Book Description">
</Description>
<Price Value="$1.99">
</Price>
<Author Text="Author Name"
Value="LastName"
Image="Authorimage1.jpg"
Nav="http://www.microsoft.com"
Tip="Author Name">
</Author>
</Book>
<Book Text="Book Title Two"
Value="2"
Image="Bookimage2.jpg"
ImageToolTip="Book 2 Photo"
Nav="http://www.microsoft.com"
Tip="Click Me">
<Description Text="Book Description">
</Description>
<Price Value="$2.99">
</Price>
<Author Text="Author Name"
Value="LastName"
Image="Authorimage2.jpg"
Nav="http://www.microsoft.com"
Tip="Author Name">
</Author>
</Book>
</Books>
Reference
TreeNodeBinding ClassTreeNodeBinding Members
System.Web.UI.WebControls Namespace
TreeView
TreeNode
DataBindings
TreeNodeBinding.DataMember Property
TreeNodeBinding.Depth Property
TreeNode.ImageUrl Property
TreeNodeBinding.ImageUrl Property
TreeNodeBinding.ImageUrlField Property
TreeNodeBinding.ImageToolTip Property
TreeNodeBinding.ImageToolTipField Property
TreeNode.NavigateUrl Property
TreeNodeBinding.NavigateUrl Property
TreeNodeBinding.NavigateUrlField Property
TreeNode.Text Property
TreeNodeBinding.Text Property
TreeNodeBinding.TextField Property
TreeNode.ToolTip Property
TreeNodeBinding.ToolTip Property
TreeNodeBinding.ToolTipField Property
TreeNode.Value Property
TreeNodeBinding.Value Property
Note: