临时记载C#中给DataGrid添加甘特图效果

var dtMin = Convert.ToDateTime(dt.Compute("min(Start)", "1=1"));
                    var dtMax = Convert.ToDateTime(dt.Compute("max(Finish)", "1=1"));
                    int days = (dtMax - dtMin).Days;
                    while (dgMain.Columns.Count > 5)
                        dgMain.Columns.RemoveAt(dgMain.Columns.Count - 1);
                    for (int i = 0; i <= days; i++)
                    {
                        string colName = "RectColor" + i;
                        var tmpDate = dtMin.AddDays(i).Date;
                        string exp = @"iif (Start>='" + tmpDate.AddHours(12) + @"' , '#00ffffff' ,iif ('" + tmpDate + @"'>Finish, '00FFFFFF' , iif(OkDate>'" + tmpDate.AddHours(12) + "' or PercentOfComplete=100,'#FF668866','#FF66cc00') )) ";
                        dt.Columns.Add(colName, typeof(string), exp);

                        //内存中动态生成一个XAML，描述了一个DataTemplate 
                        XNamespace ns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation";
                        XElement xDataTemplate = new XElement(ns + "DataTemplate", new XAttribute("xmlns", "http://schemas.microsoft.com/winfx/2006/xaml/presentation"),
                            new XElement(ns + "Rectangle", new XAttribute("Fill", @"{Binding " + colName + "}"), new XAttribute("Margin", @"-2,3,-2,0"))); //new XAttribute("Stroke", @"#FFF06600"), new XAttribute("StrokeThickness", @"0,0,0,2")
                        //将内存中的XAML实例化成为DataTemplate对象，并赋值给 
                        //ListBox的ItemTemplate属性，完成数据绑定 
                        XmlReader xr = xDataTemplate.CreateReader();

                        DataTemplate dataTemplate = XamlReader.Load(xr) as DataTemplate;

                        DataGridTemplateColumn col = new DataGridTemplateColumn();
                        col.CellStyle = this.Resources["GanttCell"] as Style;
                        //col.HeaderStyle = this.Resources["GanttCell"] as Style;
                        col.CellTemplate = dataTemplate;
                        col.Header = tmpDate.ToString("M/d");
                        if (tmpDate.Date == DateTime.Today)
                        {
                            col.Header = "今天";
                            SolidColorBrush bb = new SolidColorBrush(Color.FromRgb(238, 238, 238));
                            Setter set = new Setter(DataGridCell.BackgroundProperty, bb);
                            SetterBaseCollection sets = new SetterBaseCollection();
                            Style style = new System.Windows.Style();
                            style.Setters.Add(set);
                            col.CellStyle = style;
                        }
                        dgMain.Columns.Add(col);