Question

我的树视图由文件夹和文件填充。我使用下面的代码来过滤树视图，但它不返回匹配字符串的所有文件，只返回一个文件。例如字母“f”有3个文件，但是当我搜索它时只返回1个文件。

private TreeNode FindNodeByValue(TreeNodeCollection nodes, string searchstring)
{

    // Loop through the tree node collection
    foreach (TreeNode node in nodes)
    {
        // Does the value match the search string?
        if (node.Value.ToUpper().Contains (searchstring.ToUpper()))
            // Yes it does match - return it
            return node;
        else
        {
            // No it does not match - search any child nodes of this node
            TreeNode childNode = SearchChildNodes(node, searchstring);
            // If the childNode is not null it was a match
            if (childNode != null)
                // Return the matching node
                return childNode;
        }
    }
    // If the matching node is not found return null
    return null;
}

/// <summary>
/// This method searches a node's ChildNodes collection to find a matching value
/// with the incoming search string
/// It will iteratively call itself as it drills into each nodes child nodes (if present)
/// </summary>
/// <param name="parentNode">Parent node to search for a match</param>
/// <param name="searchstring">string to be matched with the Nodes Value property</param>
/// <returns>Treenode of the matching node if found.  If not found it will be null</returns>
private TreeNode SearchChildNodes(TreeNode parentNode, string searchstring)
{
    // Loop through the child nodes of the parentNode passed in
    foreach (TreeNode node in parentNode.ChildNodes)
    {
        // Does the value match the search string?
        if (node.Value.ToUpper().Contains(searchstring.ToUpper()))
            // Yes it does match - return it
            return node;
        else
        {
            // No it does not match - recursively search any child nodes of this node
            TreeNode childNode = SearchChildNodes(node, searchstring);
            // If the childNode is not null it was a match
            if (childNode != null)
                // Return the matching node
                return childNode;
        }
    }
    // If the matching node is not found OR if there were no child nodes then return null
    return null;
}


protected void Button1_Click(object sender, EventArgs e)
{
    TreeNode trnode=FindNodeByValue(TreeView1.Nodes, fieldFilterTxtBx.Text);
    if (trnode != null)
    {
        TreeView1.Nodes.Clear();
      //  TreeNode newnode = new TreeNode("Detail Engineering");
       // TreeView1.Nodes.Add(newnode);
        TreeView1.Nodes.Add(trnode);
        TreeView1.ExpandAll();
    }
    else

{

Label1.Text = "No file found";

}

Answer 1

它只返回一个值，因为如果没有找到文件，函数只会递归调用自身。您还需要将递归添加到SearchChildNodes中if语句的此分支：

if (node.Value.ToUpper().Contains(searchstring.ToUpper()))
// Yes it does match - return it
    return node;
else

您还可能需要将文件名添加到数组或Generic.List中，以便一次存储多个文件名。

树视图过滤不会返回所有文件

1 个答案: