Question

求高手回答关于asp.net程序代码问题

public void BindCategoryTree(TreeView treeView, bool isExpanded, string sSelectedData)
{
Category category = new Category();
DataTable dataTable = SystemTools.ConvertDataReaderToDataTable(category.GetCategorys());/这行出现问题
treeView.Nodes.Clear();

DataRow[] rowList = dataTable.Select("ParentID='-1'");
if (rowList.Length <= 0) return;

TreeNode rootNode = new TreeNode();

rootNode.Text = rowList[0]["Desn"].ToString();
rootNode.Value = rowList[0]["CategoryID"].ToString();
rootNode.Expanded = isExpanded;
rootNode.Selected = true;
rootNode.NavigateUrl = rowList[0]["Url"].ToString() + "?CategoryID=" + rowList[0]["CategoryID"].ToString();
rootNode.Target = "MainFrame";

treeView.Nodes.Add(rootNode);

CreateSubNode(rootNode, dataTable, isExpanded, sSelectedData);
}

Answer 1

改成：
DataTable dataTable = new DataTable();
dataTable = SystemTools.ConvertDataReaderToDataTable(category.GetCategorys());

Answer 2

SystemTools是什么类？ 需要实例化