VS2005 TreeView 的 CheckBox 被点击时的引发页面回发事件

protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
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{
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SetChildChecked(e.Node);
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}
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//
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private void SetChildChecked(TreeNode parentNode)
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{
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foreach (TreeNode node in parentNode.ChildNodes)
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{
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node.Checked = parentNode.Checked;
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if (node.ChildNodes.Count > 0)
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{
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SetChildChecked(node);
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}
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}
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}