C# ComboBox SelectedItem.toString() 未返回预期结果

Question

我有一个表单，允许用户通过输入球员姓名并从组合框中选择球员所属的部门来将球员添加到花名册中。

当需要将播放器添加到我的 TreeView 控件时，应显示所选分区的节点改为显示以下文本：System.Data.DataRowView

我在这里通过 MSDN 获得了实现它的代码：https://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.selecteditem%28v=vs.110%29.aspx

这是表单加载函数中的代码，用于填充组合框：

        private void frm_add_players_Load(object sender, EventArgs e)
    {
        Divisions divs = new Divisions();
        Players players = new Players();
        DataTable dtDivisions = divs.GetActiveDivisions(); //divisions combo box
        DataTable dtPlayers = players.GetPlayersByTourID(this.tourID);
        //set the forms datatable
        this.dt_players = dtPlayers;

        //fill the combo box
        this.cmbo_divisions.DataSource = dtDivisions;
        this.cmbo_divisions.DisplayMember = "title";
        this.cmbo_divisions.ValueMember = "ID";
        this.cmbo_divisions.SelectedIndex = -1;
        this.cmbo_divisions.Text = "Select a Division";

        //set treeview imagelist
        this.tview_roster.ImageList = tview_imagelist;
        this.tview_roster.ImageIndex = 1; //division icon

        //fill treeview
        foreach (DataRow dr in dtPlayers.Rows)
        {
            FillPlayerTreeview(dr);
        }

        //expand treeview
        this.tview_roster.ExpandAll();
        this.ActiveControl = this.txt_player_name;
    }

这里我调用函数将播放器添加到TreeView:

    private void btn_add_Click(object sender, EventArgs e)
    {
        object selItem = cmbo_divisions.SelectedItem;
        AddPlayerToTreeView(txt_player_name.Text, selItem.ToString());
    }

这里是添加播放器的函数：

        private void AddPlayerToTreeView(string playerName, string division)
    {
        TreeNode[] tns = this.tview_roster.Nodes.Find(division, false); //try to find the division, if exists
        TreeNode tn = new TreeNode();

        if (tns.Length > 0) //division exists - add player
        {
            tn = this.tview_roster.Nodes[tns[0].Index].Nodes.Add(playerName, playerName);
            tn.ImageIndex = 0; //player icon
        }
        else //division doesn't exist - add division, then add player
        {
            tn = this.tview_roster.Nodes.Add(division, division);
            tn.ImageIndex = 1; //division icon
            AddPlayerToTreeView(playerName, division);
        }
    }

结果是这样的：

我不确定为什么它不起作用..而且我很茫然。任何帮助将不胜感激。

Answer 1

试试：

private void btn_add_Click(object sender, EventArgs e)
{
    AddPlayerToTreeView(txt_player_name.Text, cmbo_divisions.Items[cmbo_divisions.SelectedIndex].Text);
}

编辑：更新为更好的方式

Answer 2

试试这个：

private void btn_add_Click(object sender, EventArgs e)
{
    object selItem = cmbo_divisions.SelectedItem;
    AddPlayerToTreeView(txt_player_name.Text, cmbo_divisions.SelectedItem as string);
}

ToString() 将获取类型名称，但在这种情况下，SelectedItem 是一个字符串。

Answer 3

好吧，好吧……也许是下面这样的。

访问组合的数据源，它是一个数据表，并使用选定的索引提取选定的行和列值。也许也添加一些错误处理。

private void btn_add_Click(object sender, EventArgs e)
{
    var data = cmbo_divisions.DataSource as DataTable;
    var row = data.Rows[cmbo_divisions.SelectedIndex];
    var selected = row["title"].ToString();
    AddPlayerToTreeView(txt_player_name.Text, selected);
}

C# ComboBox SelectedItem.toString() 未返回预期结果

C# ComboBox SelectedItem.toString() not returning expected results

c#

treeview

combobox