我在加載表單時最初使用根節點樹形視圖。我將在運行時將子節點添加爲some.txt文件,方法是從用戶右鍵單擊根節點時顯示的contextmenu中選擇一個選項作爲Addnew。現在我需要的是如果樹的子節點追加到根,並且如果用戶試圖通過點擊上下文菜單中的選項addnew來創建一個新節點,我想顯示一個錯誤,因爲只有一個孩子允許。如果treeview根節點包含子節點,則顯示錯誤
我的示例代碼添加一個子節點如下:
private void AddNew_Click(object sender, EventArgs e)
{
//if (tvwACH.Nodes.Count==1)
//{
// MessageBox.Show("Only One File allowed");
//}
//else
//{
if (tvwACH.SelectedNode.Text != null)
{
string strSelectedNode = tvwACH.SelectedNode.Text.ToString();
switch (strSelectedNode)
{
case "ACH":
{
Stream myStream;
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.InitialDirectory = @"C:\";
saveFileDialog1.DefaultExt = "txt";
saveFileDialog1.Filter = "(*.txt)|*.txt";
saveFileDialog1.FilterIndex = 2;
saveFileDialog1.RestoreDirectory = true;
saveFileDialog1.ValidateNames = true;
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
FileName = saveFileDialog1.FileName;
if (FileName.Contains(" \\/:*?<>|"))
{
MessageBox.Show("File name should not contain \\/:*?<>|", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
if ((myStream = saveFileDialog1.OpenFile()) != null)
{
FileName = saveFileDialog1.FileName;
TreeNode newNode = new TreeNode(FileName);
newNode.SelectedImageIndex = 1;
tvwACH.SelectedNode.Nodes.Add(newNode);
TreeNode NodeFileHeader = newNode.Nodes.Add("FileHeader");
myStream.Close();
}
}
}
break;
}
case "FileHeader":
{
sr = new StreamReader(FileName);
strLen = sr.ReadLine();
if (strLen == null)
{
sr.Close();
Form frmFileHeader = new frmFileHeader(this);
frmFileHeader.ShowDialog(this);
}
else
{
MessageBox.Show("Only One File Header is allowed for a file", "", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
break;
}
case "BatchHeader":
{
Form frmBatch = new frmBatch(this);
frmBatch.ShowDialog();
break;
}
}
}
//}
}
您將重構該代碼,對嗎? – flq 2010-09-15 16:27:50