DevExpress TreeList Common Problem Solutions

1. How to add pictures to nodes? First, you need to add a picture control, then add a picture to it, and finally bind the node picture attribute of TreeList with the picture control. The code is as follows:

ImageList imagelist;
private void  Test window _Load(object sender, EventArgs e) 
{
con.ConnectionString = sqlconstr; 
DataTable dt = new DataTable; 
dt.Columns.Add(" Process ");
dt.Rows.Add("123");
treeList1.Dock = DockStyle.Fill;
treeList1.DataSource = dt; 
imagelist = new ImageList; 
imagelist.Images.Add(Image.FromFile(@"E:\ Picture material \2.jpg")); 
treeList1.SelectImageList = imagelist; 
treeList1.Nodes[0].ImageIndex = 0;
}

2. How do I set the background color to transparent?

treeList1.BackColor = Color.Transparent; 
treeList1.Appearance.Empty.BackColor = Color.Transparent; 
treeList1.Appearance.Row.BackColor = Color.Transparent;

3. How do I expand the current node and parent node?

/// <summary>
///  Expand the current node and parent node 
/// </summary>
/// <param name="_node">
public void ParentNodeExpend(TreeListNode _node)
{
  TreeListNode _cNode = _node;
  treeList1..Nodes.TreeList.FindNodeByID(_cNode.Id).Expanded = true;

4. How to set the display horizontal scroll bar?

public void TreeListHorzScroll(TreeList treeList)
{
treeList.OptionsView.AutoWidth = false;

Let's take a look at the solutions to DevExpress common problems

layoutControl:

1. lookAndFeel.

2. OptionsView's AllowHotTrack "Put the mouse on to change color" and DrawItemBorders "Whether the control border is displayed"

3. BeginInvoke (new MethodInvoker (delegate {textEdit1.Focus ()}); "Getting the Focus"

4. layoutControl1.OptionsItemText.TextAlignMode=AlignInLayoutControl. (After setting the drag-and-drop control, the control automatically adjusts to the original content) View the picture

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GridView:

1. Attribute IndicatorWidth, set the left-most column width of GirdView "automatically generate columns, which have nothing to do with bound data columns".

2. Disable sorting per column, this. gridView1.OptionsCustomization. AllowSort = false;

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TreeList:

1. Disable sorting for each column and set OptionsColumn. AllowSort = false for each column, which can be seen in each column of Run Designer;

DateEdit:

1. Disable mouse scrolling.

dateEdit1.Spin += new DevExpress.XtraEditors.Controls.SpinEventHandler(dateEdit1_Spin);
     void dateEdit1_Spin(object sender, DevExpress.XtraEditors.Controls.SpinEventArgs e)
     {
      e.Handled = true;
     }