Save the treeview data to tables and xml, and set the treenode tag of the treeview according to the rule.

# Region saves treeview data to the table
/// <Summary>
/// Save the treeview to the table. Because the table is an object, it is passed as a reference and no return value is required.
/// </Summary>
/// <Param name = "treeView1"> input tree </param>
/// <Param name = "strParentNumberFieldtext"> parent node tag </param>
/// <Param name = "strNumberFieldtext"> current node tag </param>
/// <Param name = "strNameFieldtext"> current node text </param>
/// <Returns> </returns>
Public DataTable SaveToDataTable (TreeView treeView1, string strParentNumberFieldtext, string strNumberFieldtext, string strNameFieldtext)
{
DataTable dt = new DataTable ("treeTable ");

DataColumn parentNumtag = new DataColumn (strParentNumberFieldtext, typeof (System. String ));
ParentNumtag. AllowDBNull = true;
ParentNumtag. MaxLength = 40;
DataColumn numTag = new DataColumn (strNumberFieldtext, typeof (System. String ));
NumTag. AllowDBNull = false;
NumTag. MaxLength = 40;
DataColumn nametext = new DataColumn (strNameFieldtext, typeof (System. String ));
Nametext. MaxLength = 40;
Dt. Columns. Add (parentNumtag );
Dt. Columns. Add (numTag );
Dt. Columns. Add (nametext );
ForTreeViewToData (treeView1, dt );

Return dt;

}

/// <Summary>
/// Save each node tag in the treeview to dt
/// </Summary>
/// <Param name = "treeView1"> the treeview to save </param>
/// <Param name = "dt"> saved dt </param>
/// <Returns> </returns>
Private void ForTreeViewToData (TreeView treeView1, DataTable dt)
{
Foreach (TreeNode treenode in treeView1.Nodes)
{
SavaTreeNodeToTableColumn (treenode, dt );
}

}

/// <Summary>
/// Save each node tag to the table to determine whether the current node is a parent node. If the first parent node is 01 and the second is 02, the child nodes are 0101,0102 respectively.
/// </Summary>
/// <Param name = "treenode"> tree node </param>
/// <Param name = "dt"> saved table </param>
Private void SavaTreeNodeToTableColumn (TreeNode treenode, DataTable dt)
{
DataRow dr = dt. NewRow ();
// Whether a parent node exists
If (treenode. Parent = null)
{
Dr [0] = "";
}
Else
{
// Save the tag of the parent node to the parent flag
Dr [0] = treenode. Parent. Tag. ToString ();

}
Dr [1] = treenode. Tag. ToString ();
Dr [2] = treenode. Text. ToString ();
Dt. Rows. Add (dr );
// Recursively save each subnode to the table
Foreach (TreeNode tempnode in treenode. Nodes)
{
SavaTreeNodeToTableColumn (tempnode, dt );
}

}
# Endregion

# Region set tags for treeview

/// <Summary>
/// Set the value for all treeview treeNode
/// </Summary>
/// <Param name = "treeView"> input treeview object </param>
/// <Returns> whether the setting is successful </returns>
Public bool SetTreeViewTag (TreeView treeView)
{
Try
{
Foreach (TreeNode treeNode in treeView. Nodes)
{
// Set a tag for each tag
SetTreeNodeTag (treeNode );
}

Return true;
}
Catch (Exception ex)
{
Return false;

// Throw;
}

}
/// <Summary>
/// Set the tag value for the current node. Recursion of all subnodes under the node
/// </Summary>
/// <Param name = "treeNode"> input node </param>
Private void SetTreeNodeTag (TreeNode treeNode)
{

SetValueToTreeNode (treeNode );
Foreach (TreeNode tempTreenode in treeNode. Nodes)
{
SetTreeNodeTag (tempTreenode );
}
}

/// <Summary>
/// Set the tag for a node in the format of 01,0101, 02,0201
/// </Summary>
/// <Param name = "treeNode"> assign a value to a node </param>
Private void SetValueToTreeNode (TreeNode treeNode)
{
String Ttag = "";
// Whether s is the root node
If (treeNode. Parent = null)
{
// Whether it is the first node of the subnode
If (treeNode. PrevNode = null)
{
Ttag = "01 ";
}
Else
{
Ttag = (Convert. toInt64 (treeNode. prevNode. tag. toString () + 1 ). toString (). padLeft (treeNode. prevNode. tag. toString (). length, '0 ');
}
}
Else
{
If (treeNode. PrevNode = null)
{
Ttag = treeNode. Parent. Tag. ToString () + "01 ";
}
Else
{
Ttag = (Convert. toInt64 (treeNode. prevNode. tag. toString () + 1 ). toString (). padLeft (treeNode. prevNode. tag. toString (). length, '0 ');
}

}
TreeNode. Tag = Ttag;
}

 

# Endregion

# Region Save the treeview to the XML file
/// <Summary>
/// Save the treeview to the Xml file
/// </Summary>
/// <Param name = "treeView1"> saved treeview </param>
/// <Param name = "xmlPath"> Save the XML Path </param>
/// <Param name = "strParentNumberFieldtext"> tag of the parent node </param>
/// <Param name = "strNumberFieldtext"> tag of the current node </param>
/// <Param name = "strNameFieldtext"> text of the current node </param>
/// <Returns> </returns>
Public bool SaveTreeViewToXml (TreeView treeView1, string xmlPath, string strParentNumberFieldtext, string strNumberFieldtext, string strNameFieldtext)
{
Try
{
DataTable dt = SaveToDataTable (treeView1, strParentNumberFieldtext, strNumberFieldtext, strNameFieldtext );
If (dt! = Null)
{
Dt. WriteXml (xmlPath );
}
Return true;
}
Catch
{

Return false;
}


}
# Endregion