C#

private static T[]
CastArray<T>
(
    object[] Value
)
{
    T[] result = new T [ Value.Length ] ;

    for ( int i = 0 ; i < result.Length ; i++ ) result [ i ] = (T) Value [ i ] ;

    return ( result ) ;
}

// System.Linq.Enumerable
private static IEnumerable<TResult> CastIterator<TResult>(IEnumerable source)
{
	foreach (object current in source)
	{
		yield return (TResult)((object)current);
	}
	yield break;
}

SledgeHammer01 wrote:

will actually be "much" slower

SledgeHammer01 wrote:

its lazy

PIEBALDconsult wrote:

That may be, but unless you try it (and/or the Enumerator you show) you'll never
know for sure -- you're only acting on hearsay or prejudice. Get a baseline
reading, then try something else and get another reading, etc. You're assuming
that what you have is "much" faster, but it may not be, you need metrics.

 

What are you trying to do?
Why are you accepting an object[] of
them; can you correct this upstream?
And what actual types are involved?
Value types? Structs? Small simple classes? Large complex classes?

PIEBALDconsult wrote:

And that cast to object looks redundant.

private void tvFileMan_AfterCheck(object sender, TreeViewEventArgs e)
 {
     getFileAndColumns();
     if (e.Node.Nodes.Count > 0)
     {
        //this.CheckAllChildNodes(e.Node, e.Node.Checked);
         // Checked a file so get fields and check all fields except subfiles.
         e.Node.Expand();
         foreach (TreeNode tn in e.Node.Nodes)
         {
             if (tn.Nodes.Count.Equals(0))
                 tn.Checked = e.Node.Checked;
         }
         getChildNodesToGrid();
     }
     else
     {
         e.Node.Expand();

             //if (tn.Nodes.Count.Equals(0))
             if (e.Node.Checked)
             {
                 //tn.Checked = e.Node.Checked;
                 getChildNodesToGrid();
             }

     }

private DataTable getFieldsTable()
 {
     //original
     DataTable dt = new DataTable();
     dt.Columns.Add("ColumnName");
     dt.Columns.Add("FMFieldName");
     dt.Columns.Add("FMFieldNumber");
     dt.Columns.Add("FMFileNumber");
     dt.Columns.Add("FMFieldType");
     dt.Columns.Add("ResolvedValue");
     dt.Columns.Add("PointsToFileNumber");
     TreeNode fileNode = tvFileMan.SelectedNode;
     int cnt = 0;
     foreach (TreeNode tn in fileNode.Nodes)
     {
         if (tn.Nodes.Count == 0)
         {
             if (fileNode.Nodes[cnt].Checked)
             {
              DataRow dr = dt.NewRow();

             dr["FMFieldName"] = tn.Text.Substring(tn.Text.IndexOf("  - ") + 4);
             dr["FMFieldNumber"] = tn.Tag.ToString();
             dr["FMFileNumber"] = tn.Parent.Tag.ToString();
             dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4));
             //added by TEA 9/3/14 to get PointsToFileNumber in DataGrid
             if (dr["PointsToFileNumber"].ToString().Length > 0)
             {
                 dr["ColumnName"] = suggestName(tn.Text.Substring(tn.Text.IndexOf("  - ") + 4) + "txt");
             }
             dt.Rows.Add(dr);
             }
             cnt++;
         }
     }
     return dt;

 }
private void getFileAndColumns()
 {
     label4.Visible = false;
     label5.Visible = false;
     btAllFields.Visible = false;
     cbComputed.Checked = false;
     TreeNode node = tvFileMan.SelectedNode;
     if (node == null) return;
     // Is it a File or Field?
     if (node.Index == 0) return;

     if (node.Nodes.Count > 0)
     {
         // FileManFile selected.
         // Check AttributeMap for this file. If found, fill in textboxes with that info.

         // Otherwise, suggest a name for the table.
         tbFileNumber.Text = node.Tag.ToString();
         tbFileName.Text = node.Text.Substring(node.Text.IndexOf("  - ") + 4);
         tbTableName.Text = "xxxx." + (suggestName(tbFileName.Text) + "F" + tbFileNumber.Text.Replace('.', 'x'));
         label4.Text = "To select all fields push button to the right. \nOtherwise double-click fields to add them one at a time.";
         label4.Visible = true;
         btAllFields.Visible = true;
         dgvColumns.DataSource = null;
         dgvPKIENS.DataSource = getPKIENSTable();
         getPKIENSIDs();
     }
     else
     {
         // FileMan Field selected.
     }


 }