我的C＃编码应用程序使用Infragistics.Win.UltraWinGrid.UltraGrid显示一些数据。数据基本上是计算机的集合。该应用程序能够过滤这些计算机（如“工作站”，“服务器”等）以供查看。这是我过滤的方式：
private DataView FilterTableDataForViewing(DataTable originalTable, string filterString, UltraGrid viewGrid)
{
DataView dataView = new DataView(originalTable);
dataView.RowStateFilter = DataViewRowState.CurrentRows;
dataView.RowFilter = filterString;
DataTable filteredTable = dataView.ToTable(originalTable.TableName + "_" + dataView.RowFilter);
viewGrid.DataSource = filteredTable;
gridDiscoveryMain.DisplayLayout.ViewStyleBand = ViewStyleBand.OutlookGroupBy;
SetFlagImagesAndColumnWidthsOfDiscoveryGrid();
return dataView;
}
请注意，我将表名设置为可能很大的过滤字符串。
这就是我使用上述方法的方法：
string filterString = "([Build] = '4.0' AND NOT([OS Plus Version] LIKE '%Server%'))";
filterString += " OR ([Build] = '4.10')";
filterString += " OR ([Build] = '4.90')";
filterString += " OR ([Build] = '5.0' AND NOT([OS Plus Version] LIKE '%Server%'))";
filterString += " OR ([Build] = '5.1')";
filterString += " OR ([Build] = '6.0' AND ";
filterString += "(NOT([OS Plus Version] LIKE '%Server%')) OR (NOT([OS] LIKE '%Server%')))";
FilterTableDataForViewing(dataSet.Tables["DiscoveryData"], filterString, gridDiscoveryMain);
到目前为止，一切都很好。 UltraGrids具有一个工具，允许您选择要隐藏的列并创建新的自定义列。启动此工具时，将触发名为BeforeColumnChooserDisplayed的UltraGrid事件。这是我的处理程序：
private void gridDiscoveryMain_BeforeColumnChooserDisplayed(object sender, BeforeColumnChooserDisplayedEventArgs e)
{
if (gridDiscoveryMain.DataSource == null)
return;
e.Cancel = true;
gridDiscoveryMain.DisplayLayout.Override.RowSelectors = DefaultableBoolean.True;
gridDiscoveryMain.DisplayLayout.Override.RowSelectorHeaderStyle = RowSelectorHeaderStyle.ColumnChooserButton;
ShowCustomColumnChooserDialog();
this.customColumnChooserDialog.CurrentBand = e.Dialog.ColumnChooserControl.CurrentBand;
this.customColumnChooserDialog.ColumnChooserControl.Style = ColumnChooserStyle.AllColumnsWithCheckBoxes;
}
这是ShowCustomColumnChooserDialog方法实现：
private void ShowCustomColumnChooserDialog()
{
DataTable originalTable = GetUnderlyingDataSource(gridDiscoveryMain);
if (this.customColumnChooserDialog == null || this.customColumnChooserDialog.IsDisposed)
{
customColumnChooserDialog = new CustomColumnChooser(ManageColumnDeleted);
customColumnChooserDialog.Owner = Parent.FindForm();
customColumnChooserDialog.Grid = gridDiscoveryMain;
}
this.customColumnChooserDialog.Show();
}
customColumnChooserDialog基本上是一个为Infragistics默认添加一点额外的表单。它的代码最重要的是这个方法：
private void InitializeBandsCombo( UltraGridBase grid )
{
this.ultraComboBandSelector.SetDataBinding( null, null );
if ( null == grid )
return;
// Create the data source that we can bind to UltraCombo for displaying
// list of bands. The datasource will have two columns. One that contains
// the instances of UltraGridBand and the other that contains the text
// representation of the bands.
UltraDataSource bandsUDS = new UltraDataSource( );
bandsUDS.Band.Columns.Add( "Band", typeof( UltraGridBand ) );
bandsUDS.Band.Columns.Add( "DisplayText", typeof( string ) );
foreach ( UltraGridBand band in grid.DisplayLayout.Bands )
{
if ( ! this.IsBandExcluded( band ) )
{
bandsUDS.Rows.Add( new object[] { band, band.Header.Caption } );
}
}
this.ultraComboBandSelector.DisplayMember = "DisplayText";
this.ultraComboBandSelector.ValueMember= "Band";
this.ultraComboBandSelector.SetDataBinding( bandsUDS, null );
// Hide the Band column.
this.ultraComboBandSelector.DisplayLayout.Bands[0].Columns["Band"].Hidden = true;
// Hide the column headers.
this.ultraComboBandSelector.DisplayLayout.Bands[0].ColHeadersVisible = false;
// Set some properties to improve the look & feel of the ultra combo.
this.ultraComboBandSelector.DropDownWidth = 0;
this.ultraComboBandSelector.DisplayLayout.Override.HotTrackRowAppearance.BackColor = Color.LightYellow;
this.ultraComboBandSelector.DisplayLayout.AutoFitStyle = AutoFitStyle.ResizeAllColumns;
this.ultraComboBandSelector.DisplayLayout.BorderStyle = UIElementBorderStyle.Solid;
this.ultraComboBandSelector.DisplayLayout.Appearance.BorderColor = SystemColors.Highlight;
}
如果我单步执行代码，那么在我退出事件处理程序（控件返回到表单的位置）之前，这一切都很酷。当我尝试从显示过滤数据的网格中显示CustomColumnChooser对话框时，我收到了一个只有 的ArgumentException。不是那种在代码中显示违规行的类型，而是显示“Microsoft .NET Framework”错误消息框的类型，其中显示“应用程序中发生了未处理的异常......”。这意味着我无法追踪造成它的原因。该应用程序在此之后不会崩溃，但是可能的CustomColumnChooser对话框会出现只包含白色背景和大红色“X”的容器。
堆栈跟踪：
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.ArgumentException: Child list for field DiscoveryData_([Build] = '4 cannot be created.
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.EnsureListManager(Object dataSource, String dataMember)
at System.Windows.Forms.BindingContext.get_Item(Object dataSource, String dataMember)
at Infragistics.Win.UltraWinGrid.UltraGridLayout.ListManagerUpdated(BindingManagerBase bindingManager)
at Infragistics.Win.UltraWinGrid.UltraGridLayout.ListManagerUpdated()
at Infragistics.Win.UltraWinGrid.UltraGridBase.Set_ListManager(Object newDataSource, String newDataMember)
at Infragistics.Win.UltraWinGrid.UltraGridBase.SetDataBindingHelper(Object dataSource, String dataMember, Boolean hideNewColumns, Boolean hideNewBands)
at Infragistics.Win.UltraWinGrid.UltraGridBase.SetDataBinding(Object dataSource, String dataMember, Boolean hideNewColumns, Boolean hideNewBands)
at Infragistics.Win.UltraWinGrid.UltraGridBase.SetDataBinding(Object dataSource, String dataMember, Boolean hideNewColumns)
at Infragistics.Win.UltraWinGrid.UltraGridBase.SetDataBinding(Object dataSource, String dataMember)
at Infragistics.Win.UltraWinGrid.UltraGridColumnChooser.CreateColumnChooserGridDataStructure()
at Infragistics.Win.UltraWinGrid.UltraGridColumnChooser.Initialize()
at Infragistics.Win.UltraWinGrid.UltraGridColumnChooser.VerifyInitialized()
at Infragistics.Win.UltraWinGrid.ColumnChooserGridCreationFilter.BeforeCreateChildElements(UIElement parent)
at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
at Infragistics.Win.UltraWinGrid.UltraGridUIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive)
at Infragistics.Win.UIElement.VerifyChildElements(Boolean recursive)
at Infragistics.Win.UltraWinGrid.UltraGridUIElement.InternalInitializeRect(Boolean verify)
at Infragistics.Win.UltraWinGrid.UltraGridLayout.GetUIElement(Boolean verify, Boolean forceInitializeRect)
at Infragistics.Win.UltraWinGrid.UltraGrid.OnPaint(PaintEventArgs pe)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
字段DiscoveryData的子列表（[Build] ='4无法创建不是很有用。它的真正含义是什么？
答案 0 :(得分：2)
我对WinForms不太了解，并且从未使用过Infragistics Ultragrid。我的猜测是字段DiscoverData的子列表（[Build] ='4 在一些数据绑定代码的框架中被深深抛出。它似乎正在寻找一个子成员类名为（[Build] ='4 ，因为它在字符串文字中的点或句点（。）处停止。
我试图避免使用DataSet和DataView s，因为他们跳过了一些疯狂的箍。
可能值得启动Reflector并在System.Windows.Forms.BindingContext
答案 1 :(得分：0)
检查DataBindings。
问题通常是由于您的绑定路径引起的。 如果您有这样的事情：
labelFirstName.DataBindings.Add("Text", "_Person.Info.FName", true, DataSourceUpdateMode.OnPropertyChanged);
您可能需要将其更新为另一个Add-method重载：
labelFirstName.DataBindings.Add("Text", _Person.Info, "FName", true, DataSourceUpdateMode.OnPropertyChanged);