Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / BoundColumn.cs / 1 / BoundColumn.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.ComponentModel; using System.Globalization; using System.Web; using System.Web.UI; using System.Security.Permissions; using System.Web.Util; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class BoundColumn : DataGridColumn { ///Creates a column bounded to a data field in a ///. /// public static readonly string thisExpr = "!"; private PropertyDescriptor boundFieldDesc; private bool boundFieldDescValid; private string boundField; private string formatting; ///Specifies a string that represents "this". This field is read-only. ////// public BoundColumn() { } ///Initializes a new instance of a ///class. /// [ WebCategory("Data"), DefaultValue(""), WebSysDescription(SR.BoundColumn_DataField) ] public virtual string DataField { get { object o = ViewState["DataField"]; if (o != null) return (string)o; return String.Empty; } set { ViewState["DataField"] = value; OnColumnChanged(); } } ///Gets or sets the field name from the data model bound to this column. ////// [ WebCategory("Behavior"), DefaultValue(""), WebSysDescription(SR.BoundColumn_DataFormatString) ] public virtual string DataFormatString { get { object o = ViewState["DataFormatString"]; if (o != null) return (string)o; return String.Empty; } set { ViewState["DataFormatString"] = value; OnColumnChanged(); } } ///Gets or sets the display format of data in this /// column. ////// [ WebCategory("Behavior"), DefaultValue(false), WebSysDescription(SR.BoundColumn_ReadOnly) ] public virtual bool ReadOnly { get { object o = ViewState["ReadOnly"]; if (o != null) return (bool)o; return false; } set { ViewState["ReadOnly"] = value; OnColumnChanged(); } } ///Gets or sets the property that prevents modification to data /// in this column. ////// protected virtual string FormatDataValue(object dataValue) { string formattedValue = String.Empty; if (!DataBinder.IsNull(dataValue)) { if (formatting.Length == 0) { formattedValue = dataValue.ToString(); } else { formattedValue = String.Format(CultureInfo.CurrentCulture, formatting, dataValue); } } return formattedValue; } ////// public override void Initialize() { base.Initialize(); boundFieldDesc = null; boundFieldDescValid = false; boundField = DataField; formatting = DataFormatString; } ////// public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) { base.InitializeCell(cell, columnIndex, itemType); Control childControl = null; Control boundControl = null; switch (itemType) { case ListItemType.Header: case ListItemType.Footer: break; case ListItemType.Item: case ListItemType.AlternatingItem: case ListItemType.SelectedItem: if (DataField.Length != 0) { boundControl = cell; } break; case ListItemType.EditItem: if (ReadOnly == true) { goto case ListItemType.Item; } else { // TextBox editor = new TextBox(); childControl = editor; if (boundField.Length != 0) { boundControl = editor; } } break; } if (childControl != null) { cell.Controls.Add(childControl); } if (boundControl != null) { boundControl.DataBinding += new EventHandler(this.OnDataBindColumn); } } ///Initializes a cell in the DataGridColumn. ////// private void OnDataBindColumn(object sender, EventArgs e) { Debug.Assert(DataField.Length != 0, "Shouldn't be DataBinding without a DataField"); Control boundControl = (Control)sender; DataGridItem item = (DataGridItem)boundControl.NamingContainer; object dataItem = item.DataItem; if (boundFieldDescValid == false) { if (!boundField.Equals(thisExpr)) { boundFieldDesc = TypeDescriptor.GetProperties(dataItem).Find(boundField, true); if ((boundFieldDesc == null) && !DesignMode) { throw new HttpException(SR.GetString(SR.Field_Not_Found, boundField)); } } boundFieldDescValid = true; } object data = dataItem; string dataValue; if ((boundFieldDesc == null) && DesignMode) { dataValue = SR.GetString(SR.Sample_Databound_Text); } else { if (boundFieldDesc != null) { data = boundFieldDesc.GetValue(dataItem); } dataValue = FormatDataValue(data); } if (boundControl is TableCell) { if (dataValue.Length == 0) { dataValue = " "; } ((TableCell)boundControl).Text = dataValue; } else { Debug.Assert(boundControl is TextBox, "Expected the bound control to be a TextBox"); ((TextBox)boundControl).Text = dataValue; } } } }
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