TreeNodeCollection.CopyTo(TreeNode[], Int32) Método
Definição
Importante
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Copia todos os itens do objeto TreeNodeCollection para uma matriz unidimensional compatível de objetos TreeNode, começando no índice especificado na matriz de destino.
public:
void CopyTo(cli::array <System::Web::UI::WebControls::TreeNode ^> ^ nodeArray, int index);public void CopyTo (System.Web.UI.WebControls.TreeNode[] nodeArray, int index);member this.CopyTo : System.Web.UI.WebControls.TreeNode[] * int -> unitPublic Sub CopyTo (nodeArray As TreeNode(), index As Integer)Parâmetros
- nodeArray
- TreeNode[]
Uma matriz de base zero de objetos TreeNode que recebe os itens copiados do TreeNodeCollection.
- index
- Int32
A posição na matriz de destino na qual começar a receber o conteúdo copiado.
Exemplos
O exemplo a seguir demonstra como usar o CopyTo método para copiar os valores de uma TreeNodeCollection matriz. Observe que a Nodes propriedade retorna um TreeNodeCollection objeto.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// If the TreeView control contains any root nodes, display the
// text value of each node.
if (LinksTreeView.Nodes.Count > 0)
{
// Declare an array of TreeNode objects.
TreeNode[] RootNodeArray = new TreeNode[LinksTreeView.Nodes.Count];
// Use the CopyTo method to copy the root nodes into the array.
LinksTreeView.Nodes.CopyTo(RootNodeArray, 0);
// Display the root nodes.
foreach (TreeNode node in RootNodeArray)
{
Message.Text += node.Text + "<br />";
}
}
else
{
Message.Text = "The TreeView control does not have any nodes.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeCollection CopyTo Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeCollection CopyTo Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents"
Expanded="true">
<asp:TreeNode Text="Chapter One">
<asp:TreeNode Text="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two">
<asp:TreeNode Text="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1">
<asp:TreeNode Text="Subtopic 1"/>
<asp:TreeNode Text="Subtopic 2"/>
</asp:TreeNode>
<asp:TreeNode Text="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' If the TreeView control contains any root nodes, display the
' text value of each node.
If LinksTreeView.Nodes.Count > 0 Then
' Declare an array of TreeNode objects.
Dim RootNodeArray(LinksTreeView.Nodes.Count - 1) As TreeNode
' Use the CopyTo method to copy the root nodes into the array.
LinksTreeView.Nodes.CopyTo(RootNodeArray, 0)
' Display the root nodes.
Dim node As TreeNode
For Each node In RootNodeArray
Message.Text &= node.Text & "<br />"
Next node
Else
Message.Text = "The TreeView control does not have any nodes."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeCollection CopyTo Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeCollection CopyTo Example</h3>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents"
Expanded="true">
<asp:TreeNode Text="Chapter One">
<asp:TreeNode Text="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two">
<asp:TreeNode Text="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1">
<asp:TreeNode Text="Subtopic 1"/>
<asp:TreeNode Text="Subtopic 2"/>
</asp:TreeNode>
<asp:TreeNode Text="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
Comentários
Use o CopyTo método para copiar o conteúdo do TreeNodeCollection objeto baseado em System.Array zero especificado. Os itens são copiados a partir do índice especificado da matriz de destino. Com o System.Array objeto, você pode usar a sintaxe da matriz para acessar os itens no TreeNodeCollection.
Como alternativa, você também pode usar o GetEnumerator método para criar um enumerador que pode ser usado para acessar os itens na coleção.