填充后 ListView 空白

Question

我有一个Dictionary<string, string>对象，它的数据应该通过在TextBox控件中提交的文本进行实时过滤，然后在ListView控件中显示。我想出的解决方案是：转换Dictionary<string, string>为DataTable使用文本框的TextChanged事件触发过滤器将过滤后的记录放入DataRow[]数组，将所述数组作为参数传递给自定义方法以填充ListView对象现在，这就是我转换字典的方式：static DataTable dtDepartments { get; set; }static Dictionary<string, string> GetDepartments(string _depNum, out bool _isOff)  {     // retrieve the list from a SQL Server DB }public myForm(){    InitializeComponent();    Dictionary<string, string> Departments = new Dictionary<string, string>();    Departments = GetDepartments(string.Empty, out bool _isOff);    dtDepartments = new DataTable();    dtDepartments.TableName = "DEPARTMENTS";    DataColumn idColumn = dtDepartments.Columns.Add("NUM", typeof(string));    dtDepartments.Columns.Add("NAME", typeof(string));    dtDepartments.PrimaryKey = new DataColumn[] { idColumn };    foreach(KeyValuePair<string,string> kvP in Departments)    {        dtDepartments.Rows.Add(new object[] { kvP.Key, kvP.Value });    }}这就是我在事件方法中填充列表的方式private void txtFilter_TextChanged(object sender, EventArgs e){    string filter = "NAME LIKE '%" + txtFilter.Text + "%'";    DataRow[] foundRows = dtDepartments.Select(filter);    if (foundRows.Length > 0)    {        lvDepartments.Visible = true;        ResizeListView(foundRows.Length);        PopulateListView(foundRows);    }}void ResizeListView(int _rows){    lvDepartments.Height = Math.Min(25 + (20 * _rows), 205);}void PopulateListView(DataRow[] _foundRows){    lvDepartments.Items.Clear();    ListViewItem depNum = new ListViewItem("NUM", 0);    ListViewItem depName = new ListViewItem("NAME", 0);    foreach (DataRow row in _foundRows)    {        depNum.SubItems.Add(row.Field<string>("NUM"));        depName.SubItems.Add(row.Field<string>("NAME"));    }该DataRow[]阵列被正确填充，ResizeListView(int _rows)方法做它的适应名单高度作业时，ListView正确显示的列标题，但剩下的只是空行。