Treeview problem in vs: index and length must refer to the position within the string. Parameter name: length

heianyuan

When the value read from the database is in Chinese, the following error will occur when the node is expanded

The index and length must refer to the position within the string. Parameter name: length

What I used is:

Set PopulateOnDemand to true, and the child nodes are dynamically generated.

arbuliyerlu

This has nothing to do with Chinese, it should be a code problem.

heianyuan

private void BindTree()
    {
        YCSD.BLL.Account_Project bll = new YCSD.BLL.Account_Project();
        DataTable dt = bll.GetList(10,1,"FatherNode ='-1'").Tables[0];
        TreeNode myTreeNode;
        for(int i = 0;i<dt.Rows.Count;i++)
        {
            myTreeNode = new TreeNode();
            myTreeNode.Value = dt.Rows[i]["ProjectID"].ToString();
            myTreeNode.Text = dt.Rows[i]["ProjectID"].ToString()+dt.Rows[i]["ProjectName"].ToString();
            myTreeNode.PopulateOnDemand = true;
            TreeView1.Nodes.Add(myTreeNode);
        }
    }
    protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
        TreeNode newNode;
        YCSD.BLL.Account_Project bll = new YCSD.BLL.Account_Project();
        DataTable dt = bll.GetList(10, 1, "FatherNode ='" + e.Node.Value + "'").Tables[0];
        for (int i = 0; i <dt.Rows.Count; i++)
        {
            newNode = new TreeNode();
            newNode.Value = dt.Rows[i]["ProjectID"].ToString();
            newNode.Text = dt.Rows[i]["ProjectID"].ToString() + dt.Rows[i]["ProjectName"].ToString();
            //Set PopulateOnDemand to true to ensure that the child nodes below can still be dynamically generated.
            newNode.PopulateOnDemand = true;
            e.Node.ChildNodes.Add(newNode);
        }
    }
These are two methods: for English and numbers, there is no problem, if it is Chinese, there will be a problem.

ymooner

It is estimated to be related to page encoding or database encoding. This is generally not touched. We have no problems here.