c# devexpress xtragrid 列格式答案

【问题标题】：c# devexpress xtragrid column formatc# devexpress xtragrid 列格式
【发布时间】：2017-03-26 10:50:12
【问题描述】：

我正在尝试在 XtraGrid 组件中设置列的自定义格式：

public class Customers
{
    public object A { get; set; }
}

Customers c61 = new Customers();
c61.A = DateTime.Now.AddDays(1);

Customers c62 = new Customers();
c62.A = DateTime.Now.AddDays(3);

List<Customers> tmpList = new List<Customers>();
tmpList.Add(c61);
tmpList.Add(c61);

gridControl1.DataSource = tmpList;

GridColumn gc = new GridColumn();
(gridControl1.MainView as GridView).Columns.AddRange(new DevExpress.XtraGrid.Columns.GridColumn[] { gc });

gc.Caption = "A";
gc.FieldName = "A";

(gridControl1.MainView as GridView).Columns["A"].DisplayFormat.FormatType = DevExpress.Utils.FormatType.DateTime;
(gridControl1.MainView as GridView).Columns["A"].DisplayFormat.FormatString = "dd/MM/yyyy";

它不工作。但是当我简单地显式删除添加列时，XtraGrid 会自动填充列并且格式工作正常。工作代码：

Customers c61 = new Customers();
c61.A = DateTime.Now.AddDays(1);

Customers c62 = new Customers();
c62.A = DateTime.Now.AddDays(3);

List<Customers> tmpList = new List<Customers>();
tmpList.Add(c61);
tmpList.Add(c61);

gridControl1.DataSource = tmpList;

(gridControl1.MainView as GridView).Columns["A"].DisplayFormat.FormatType = DevExpress.Utils.FormatType.DateTime;
(gridControl1.MainView as GridView).Columns["A"].DisplayFormat.FormatString = "dd/MM/yyyy";

【问题讨论】：

标签： c# devexpress xtragrid

【解决方案1】：

在您的第一个示例中，有自动填充的可见列和使用自定义格式显式创建的隐藏列。当您显式添加列时，默认情况下您的列是隐藏的。您需要通过将GridColumn.Visible 属性设置为true 或使用其GridColumn.VisibleIndex 属性来显示它。此外，当您显式添加列时，最好使用 GridView.OptionsBehavior.AutoPopulateColumns 属性来关闭网格视图的自动填充。
这是一个例子：

Customers c61 = new Customers();
c61.A = DateTime.Now.AddDays(1);

Customers c62 = new Customers();
c62.A = DateTime.Now.AddDays(3);

List<Customers> tmpList = new List<Customers>();
tmpList.Add(c61);
tmpList.Add(c61);

var view = gridControl1.MainView as GridView;
view.OptionsBehavior.AutoPopulateColumns = false; // <= Turn off the autopulation before assign the data source.

gridControl1.DataSource = tmpList;

GridColumn gc = new GridColumn();

view.Columns.AddRange(new DevExpress.XtraGrid.Columns.GridColumn[] { gc });

gc.Caption = "A";
gc.FieldName = "A";
gc.Visible = true; // <= Unhide your column.

view.Columns["A"].DisplayFormat.FormatType = DevExpress.Utils.FormatType.DateTime;
view.Columns["A"].DisplayFormat.FormatString = "dd/MM/yyyy";

【讨论】：