该博客主要围绕DataGrid中的RowSelectorColumn展开，介绍了其创建、查找方法，还给出了使用示例。同时，对RowSelectorColumn中的ParticipantRadioButton类进行了详细说明，包括其数据加载、事件处理及属性渲染等方面的实现。
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Resources;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
namespace MetaBuilders.WebControls 
{
/**//// <summary>
/// A <see cref="DataGridColumn"/> which shows a checkbox in each row to signal the selection of that row.
/// </summary>
/// <example>
/// This example shows the use of this column in a simple <see cref="DataGrid"/>
/// <code>
/// <![CDATA[
/// <%@ Import Namespace="System.Data" %>
/// <%@ Register TagPrefix="mbrsc" Namespace="MetaBuilders.WebControls" Assembly="MetaBuilders.WebControls.RowSelectorColumn" %>
///
/// <html>
/// <script language="C#" runat="server">
///
/// ICollection CreateDataSource()
/// {
/// DataTable dt = new DataTable();
/// DataRow dr;
///
/// dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
/// dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
///
/// for (int i = 0; i < 5; i++)
/// {
/// dr = dt.NewRow();
///
/// dr[0] = i;
/// dr[1] = "Item " + i.ToString();
///
/// dt.Rows.Add(dr);
/// }
///
/// DataView dv = new DataView(dt);
/// return dv;
/// }
///
/// void Page_Load(Object sender, EventArgs e)
/// {
///
/// if (!IsPostBack)
/// {
/// // Load this data only once.
/// ItemsGrid.DataSource= CreateDataSource();
/// ItemsGrid.DataBind();
/// }
/// }
///
/// protected void ShowSelections( Object sender, EventArgs e ) {
/// RowSelectorColumn rsc = ItemsGrid.Columns[0] as RowSelectorColumn;
/// Message.Text = "Total selected rows = " + rsc.SelectedIndexes.Length.ToString() + "<br>";
/// foreach( Int32 selectedIndex in rsc.SelectedIndexes ) {
/// Message.Text += selectedIndex.ToString() + "<br>";
/// }
/// }
///
/// </script>
///
/// <body>
///
/// <form runat=server>
///
/// <h3>DataGrid Example</h3>
///
/// <asp:DataGrid id="ItemsGrid"
/// BorderColor="black"
/// BorderWidth="1"
/// CellPadding="3"
/// AutoGenerateColumns="true"
/// runat="server">
///
/// <HeaderStyle BackColor="darkblue" forecolor="white">
/// </HeaderStyle>
/// <Columns>
/// <mbrsc:RowSelectorColumn allowselectall="true" />
/// </Columns>
///
/// </asp:DataGrid>
///
/// <asp:Button runat="server" onclick="ShowSelections" text="Show Selections" />
/// <br>
/// <asp:Label runat="server" id="Message" />
///
/// </form>
///
/// </body>
/// </html>
/// ]]>
/// </code>
/// </example>
public class RowSelectorColumn : DataGridColumn {
Constructors#region Constructors
/**//// <summary>
/// Creates a new instance of the RowSelectorColumn control.
/// </summary>
[Description("Creates a new instance of the RowSelectorColumn control.")]
public RowSelectorColumn() : base() {
}
#endregion
FindColumns#region FindColumns
/**//// <summary>
/// Finds the first <see cref="RowSelectorColumn"/> in the given <see cref="DataGrid"/>.
/// </summary>
/// <param name="grid">The <see cref="DataGrid"/> to search.</param>
/// <returns>The <see cref="RowSelectorColumn"/> found, or null.</returns>
public static RowSelectorColumn FindColumn( DataGrid grid ) {
RowSelectorColumn foundCol = null;
foreach( DataGridColumn col in grid.Columns ) {
foundCol = col as RowSelectorColumn;
if ( foundCol != null ) {
return foundCol;
}
}
return null;
}
/**//// <summary>
/// Finds the first <see cref="RowSelectorColumn"/> in the given <see cref="DataGrid"/> after or at the given column index.
/// </summary>
/// <param name="grid">The <see cref="DataGrid"/> to search.</param>
/// <param name="startIndex">The index of the column to start the search.</param>
/// <returns>The <see cref="RowSelectorColumn"/> found, or null.</returns>
public static RowSelectorColumn FindColumn( DataGrid grid, Int32 startIndex ) {
RowSelectorColumn foundCol = null;
for( Int32 i = startIndex; i < grid.Columns.Count; i++ ) {
foundCol = grid.Columns[i] as RowSelectorColumn;
if ( foundCol != null ) {
return foundCol;
}
}
return null;
}
#endregion
Cell Creation#region Cell Creation
/**//// <summary>
/// This member overrides <see cref="DataGridColumn.InitializeCell"/>.
/// </summary>
public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) {
base.InitializeCell(cell, columnIndex, itemType);
switch (itemType) {
case ListItemType.EditItem:
case ListItemType.Item:
case ListItemType.AlternatingItem:
case ListItemType.SelectedItem:
if ( this.SelectionMode == ListSelectionMode.Multiple ) {
ParticipantCheckBox selector = new ParticipantCheckBox();
selector.ID = "RowSelectorColumnSelector";
cell.Controls.Add( selector );
if ( AllowSelectAll ) {
RegisterForSelectAll( selector );
}
} else {
ParticipantRadioButton selector = new ParticipantRadioButton();
selector.Name = "RowSelectorColumnSelector";
selector.ID = "RowSelectorColumnSelector";
cell.Controls.Add( selector );
selector.DataBinding += new EventHandler( this.selectorDataBinding );
}
break;
case ListItemType.Header:
if ( AllowSelectAll && this.SelectionMode == ListSelectionMode.Multiple ) {
selectAllControl = new System.Web.UI.HtmlControls.HtmlInputCheckBox();
selectAllControl.ID = "RowSelectorColumnAllSelector";
ApplyScriptToSelectAllCheckBox();
RegisterSelectAllScript();
cell.Controls.Add( selectAllControl );
}
break;
}
}
/**//// <summary>
///
/// </summary>
protected virtual void SetIndexValue( HtmlInputRadioButton radioSelector ) {
DataGridItem row = radioSelector.NamingContainer as DataGridItem;
if ( row != null ) {
radioSelector.Value = row.ItemIndex.ToString();
}
}
/**//// <summary>
/// Gets the checkbox appearing in the header row which controls the other checkboxes.
/// </summary>
/// <remarks>The checkbox if <see cref="AllowSelectAll"/> is true, otherwise null.</remarks>
[Description("Gets the checkbox appearing in the header row which controls the other checkboxes.")]
protected virtual System.Web.UI.HtmlControls.HtmlInputCheckBox SelectAllControl {
get {
return this.selectAllControl;
}
}
#endregion
Properties#region Properties
/**//// <summary>
/// Gets or sets the behavior of including a checkbox in the Header area which selects all the row checkboxes based on its value.
/// </summary>
/// <remarks>This behavior will only exist on browsers supporting javascript and the W3C DOM.</remarks>
[
DefaultValue(false),
Description("Gets or sets the behavior of including a checkbox in the Header area which selects all the row checkboxes based on its value.")
]
public virtual Boolean AllowSelectAll {
get {
object savedState = null;
savedState = this.ViewState["AllowSelectAll"];
if ( savedState != null ) {
return (Boolean)savedState;
}
return false;
}
set {
this.ViewState["AllowSelectAll"] = value;
}
}
/**//// <summary>
/// Gets or sets the selection mode of the <see cref="RowSelectorColumn"/>.
/// </summary>
/// <remarks>
/// Use the SelectionMode property to specify the mode behavior of the <see cref="RowSelectorColumn"/>.
/// Setting this property to ListSelectionMode.Single indicates only a single item can be selected, while ListSelectionMode.Multiple specifies multiple items can be selected.
/// </remarks>
[
DefaultValue(ListSelectionMode.Multiple),
Description("Gets or sets the selection mode of the RowSelectorColumn.")
]
public virtual ListSelectionMode SelectionMode {
get {
object savedState = null;
savedState = this.ViewState["SelectionMode"];
if ( savedState != null ) {
return (ListSelectionMode)savedState;
}
return ListSelectionMode.Multiple;
}
set {
this.ViewState["SelectionMode"] = value;
}
}
/**//// <summary>
/// Gets an array of the DataGridItem indexes which are marked as selected.
/// </summary>
/// <remarks>The index can be used to get, for example, in the DataKeys collection to get the keys for the selected rows.</remarks>
[
Browsable(false),
Description("Gets an array of the DataGridItem indexes which are marked as selected.")
]
public virtual Int32[] SelectedIndexes {
get {
System.Collections.ArrayList selectedIndexList = new System.Collections.ArrayList();
Int32 thisCellIndex = this.Owner.Columns.IndexOf(this);
foreach( DataGridItem item in this.Owner.Items ) {
Control foundControl = item.FindControl("RowSelectorColumnSelector");
System.Web.UI.HtmlControls.HtmlInputCheckBox Checkselector = foundControl as System.Web.UI.HtmlControls.HtmlInputCheckBox;
System.Web.UI.HtmlControls.HtmlInputRadioButton radioselector = foundControl as System.Web.UI.HtmlControls.HtmlInputRadioButton;
if ( Checkselector != null && Checkselector.Checked ) {
selectedIndexList.Add( item.ItemIndex );
} else if ( radioselector != null && radioselector.Checked ) {
selectedIndexList.Add( item.ItemIndex );
}
}
return (Int32[])selectedIndexList.ToArray(typeof( System.Int32 ) );
}
}
#endregion
SelectAll Script#region SelectAll Script
/**//// <summary>
/// Applies to the SelectAll checkbox the javascript neccessary to create its behavior.
/// </summary>
[ Description("Applies to the SelectAll checkbox the javascript neccessary to create its behavior.")]
protected virtual void ApplyScriptToSelectAllCheckBox() {
selectAllControl.Attributes["onclick"] = "RowSelectorColumn_SelectAll( this );";
}
/**//// <summary>
/// Emits the script library neccessary for the SelectAll behavior.
/// </summary>
[Description("Emits the script library neccessary for the SelectAll behavior.")]
protected virtual void RegisterSelectAllScript() {
if ( this.Owner.Page != null ) {
if ( !this.Owner.Page.IsClientScriptBlockRegistered("RowSelectorColumn Library") ) {
ResourceManager manager = new ResourceManager( this.GetType() );
String script = manager.GetResourceSet(System.Globalization.CultureInfo.CurrentCulture, true, true).GetString("W3Cscript");
this.Owner.Page.RegisterClientScriptBlock("RowSelectorColumn Library", script );
}
}
}
/**//// <summary>
/// Registers the given checkbox as being bound to the SelectAll checkbox.
/// </summary>
/// <param name="selector">The checkbox being bound.</param>
[Description("Registers the given checkbox as being bound to the SelectAll checkbox.")]
protected virtual void RegisterForSelectAll( ParticipantCheckBox selector ) {
selector.Master = this.selectAllControl;
}
#endregion
Private#region Private
private void selectorDataBinding( Object sender, EventArgs e ) {
ParticipantRadioButton radio = sender as ParticipantRadioButton;
if ( radio != null ) {
this.SetIndexValue( radio );
}
}
private System.Web.UI.HtmlControls.HtmlInputCheckBox selectAllControl;
#endregion
Participant Controls#region Participant Controls
/**//// <summary>
/// The checkboxes which appear in each cell of a <see cref="RowSelectorColumn"/> when <see cref="RowSelectorColumn.SelectionMode"/> is set to <see cref="ListSelectionMode.Multiple"/>.
/// </summary>
public class ParticipantCheckBox : System.Web.UI.HtmlControls.HtmlInputCheckBox {
/**//// <summary>
/// Creates a new instance of the <see cref="ParticipantCheckBox"/> class.
/// </summary>
public ParticipantCheckBox() : base() {
}
/**//// <summary>
/// Overrides <see cref="HtmlControl.Render"/>.
/// </summary>
protected override void Render( HtmlTextWriter writer ) {
base.Render(writer);
if ( master != null ) {
LiteralControl script = new LiteralControl("/r/n<script language='javascript'>/r/nRowSelectorColumn_Register('" + master.ClientID + "', '" + this.ClientID + "')/r/n</script>");
script.RenderControl(writer);
}
}
/**//// <summary>
/// Gets or sets the checkbox which controls the checked state of this checkbox.
/// </summary>
public Control Master {
get {
return this.master;
}
set {
this.master = value;
}
}
private Control master;
/**//// <summary>
/// Overrides <see cref="HtmlInputCheckBox.OnPreRender"/>.
/// </summary>
protected override void OnPreRender(System.EventArgs e) {
if ( master != null ) {
this.Attributes["onclick"] = "RowSelectorColumn_CheckChildren( '" + this.Master.ClientID + "' );";
}
base.OnPreRender(e);
}
}
/**//// <summary>
/// The radiobutton which appears in each cell of a <see cref="RowSelectorColumn"/> when <see cref="RowSelectorColumn.SelectionMode"/> is set to <see cref="ListSelectionMode.Single"/>.
/// </summary>
public class ParticipantRadioButton : System.Web.UI.HtmlControls.HtmlInputRadioButton, IPostBackDataHandler {
/**//// <summary>
/// Creates a new instance of the <see cref="ParticipantRadioButton"/> class.
/// </summary>
public ParticipantRadioButton() : base() {
}
IPostBackDataHandler Implementation#region IPostBackDataHandler Implementation
/**//// <summary>
/// This doesn't differ from the original implementaion
/// except now i'm using my own RenderednameAttribute instead of the InputControl implementation.
/// </summary>
bool IPostBackDataHandler.LoadPostData( string postDataKey, NameValueCollection postCollection ) {
bool result = false;
string postedValue = postCollection[this.RenderedNameAttribute];
if (postedValue != null && postedValue == this.Value) {
if ( this.Checked) {
return result;
}
this.Checked = true;
result = true;
} else if (this.Checked) {
this.Checked = false;
}
return result;
}
/**//// <summary>
/// No change from the InputControl implementation
/// </summary>
void IPostBackDataHandler.RaisePostDataChangedEvent() {
this.OnServerChange(EventArgs.Empty);
}
#endregion
/**//// <summary>
/// Overrides <see cref="HtmlInputRadioButton.RenderAttributes"/>.
/// </summary>
/// <remarks>Customized to use this implementation of RenderedNameAttribute</remarks>
protected override void RenderAttributes(HtmlTextWriter writer ) {
writer.WriteAttribute("value", this.Value);
this.Attributes.Remove("value");
writer.WriteAttribute("name", this.RenderedNameAttribute);
this.Attributes.Remove("name");
if (this.ID != null) {
writer.WriteAttribute("id", this.ClientID);
}
this.Attributes.Render(writer);
writer.Write(" /");
}
/**//// <summary>
/// Gets the final rendering of the Name attribute.
/// </summary>
/// <remarks>
/// Differs from the standard RenderedNameAttribute to use the column as the logical naming container instead of the row.
/// </remarks>
protected virtual String RenderedNameAttribute {
get {
this.DiscoverContainers();
if ( parentCell == null || parentDataGridItem == null || parentDataGrid == null ) {
return this.Name;
} else {
System.Text.StringBuilder groupContainer = new System.Text.StringBuilder();
groupContainer.Append( parentDataGrid.UniqueID );
groupContainer.Append( ":Column" );
groupContainer.Append( parentDataGridItem.Cells.GetCellIndex(parentCell).ToString() );
groupContainer.Append( ":" );
groupContainer.Append( this.Name );
return groupContainer.ToString();
}
}
}
private TableCell parentCell;
private DataGridItem parentDataGridItem;
private DataGrid parentDataGrid;
/**//// <summary>
/// Looks up the control heirarchy to discover the container controls for this radiobutton
/// </summary>
protected virtual void DiscoverContainers() {
if ( parentCell == null || parentDataGridItem == null || parentDataGrid == null ) {
Control tempControl = this.NamingContainer;
if ( tempControl is DataGridItem ) {
parentDataGridItem = (DataGridItem)tempControl;
parentDataGrid = (DataGrid)parentDataGridItem.NamingContainer;
}
tempControl = this.Parent;
while( tempControl.Parent.UniqueID != parentDataGridItem.UniqueID ) {
tempControl = tempControl.Parent;
}
if ( tempControl is TableCell ) {
parentCell = (TableCell)tempControl;
}
}
}
}
#endregion
}
}
using System.Collections;using System.Collections.Specialized;using System.ComponentModel;using System.Resources;using System.Web;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;namespace MetaBuilders.WebControls { /**//// <summary> /// A <see cref="DataGridColumn"/> which shows a checkbox in each row to signal the selection of that row. /// </summary> /// <example> /// This example shows the use of this column in a simple <see cref="DataGrid"/> /// <code> /// <![CDATA[ /// <%@ Import Namespace="System.Data" %> /// <%@ Register TagPrefix="mbrsc" Namespace="MetaBuilders.WebControls" Assembly="MetaBuilders.WebControls.RowSelectorColumn" %> /// /// <html> /// <script language="C#" runat="server"> /// /// ICollection CreateDataSource() /// { /// DataTable dt = new DataTable(); /// DataRow dr; /// /// dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); /// dt.Columns.Add(new DataColumn("StringValue", typeof(string))); /// /// for (int i = 0; i < 5; i++) /// { /// dr = dt.NewRow(); /// /// dr[0] = i; /// dr[1] = "Item " + i.ToString(); /// /// dt.Rows.Add(dr); /// } /// /// DataView dv = new DataView(dt); /// return dv; /// } /// /// void Page_Load(Object sender, EventArgs e) /// { /// /// if (!IsPostBack) /// { /// // Load this data only once. /// ItemsGrid.DataSource= CreateDataSource(); /// ItemsGrid.DataBind(); /// } /// } /// /// protected void ShowSelections( Object sender, EventArgs e ) { /// RowSelectorColumn rsc = ItemsGrid.Columns[0] as RowSelectorColumn; /// Message.Text = "Total selected rows = " + rsc.SelectedIndexes.Length.ToString() + "<br>"; /// foreach( Int32 selectedIndex in rsc.SelectedIndexes ) { /// Message.Text += selectedIndex.ToString() + "<br>"; /// } /// } /// /// </script> /// /// <body> /// /// <form runat=server> /// /// <h3>DataGrid Example</h3> /// /// <asp:DataGrid id="ItemsGrid" /// BorderColor="black" /// BorderWidth="1" /// CellPadding="3" /// AutoGenerateColumns="true" /// runat="server"> /// /// <HeaderStyle BackColor="darkblue" forecolor="white"> /// </HeaderStyle> /// <Columns> /// <mbrsc:RowSelectorColumn allowselectall="true" /> /// </Columns> /// /// </asp:DataGrid> /// /// <asp:Button runat="server" onclick="ShowSelections" text="Show Selections" /> /// <br> /// <asp:Label runat="server" id="Message" /> /// /// </form> /// /// </body> /// </html> /// ]]> /// </code> /// </example> public class RowSelectorColumn : DataGridColumn { Constructors#region Constructors /**//// <summary> /// Creates a new instance of the RowSelectorColumn control. /// </summary> [Description("Creates a new instance of the RowSelectorColumn control.")] public RowSelectorColumn() : base() { } #endregion FindColumns#region FindColumns /**//// <summary> /// Finds the first <see cref="RowSelectorColumn"/> in the given <see cref="DataGrid"/>. /// </summary> /// <param name="grid">The <see cref="DataGrid"/> to search.</param> /// <returns>The <see cref="RowSelectorColumn"/> found, or null.</returns> public static RowSelectorColumn FindColumn( DataGrid grid ) { RowSelectorColumn foundCol = null; foreach( DataGridColumn col in grid.Columns ) { foundCol = col as RowSelectorColumn; if ( foundCol != null ) { return foundCol; } } return null; } /**//// <summary> /// Finds the first <see cref="RowSelectorColumn"/> in the given <see cref="DataGrid"/> after or at the given column index. /// </summary> /// <param name="grid">The <see cref="DataGrid"/> to search.</param> /// <param name="startIndex">The index of the column to start the search.</param> /// <returns>The <see cref="RowSelectorColumn"/> found, or null.</returns> public static RowSelectorColumn FindColumn( DataGrid grid, Int32 startIndex ) { RowSelectorColumn foundCol = null; for( Int32 i = startIndex; i < grid.Columns.Count; i++ ) { foundCol = grid.Columns[i] as RowSelectorColumn; if ( foundCol != null ) { return foundCol; } } return null; } #endregion Cell Creation#region Cell Creation /**//// <summary> /// This member overrides <see cref="DataGridColumn.InitializeCell"/>. /// </summary> public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) { base.InitializeCell(cell, columnIndex, itemType); switch (itemType) { case ListItemType.EditItem: case ListItemType.Item: case ListItemType.AlternatingItem: case ListItemType.SelectedItem: if ( this.SelectionMode == ListSelectionMode.Multiple ) { ParticipantCheckBox selector = new ParticipantCheckBox(); selector.ID = "RowSelectorColumnSelector"; cell.Controls.Add( selector ); if ( AllowSelectAll ) { RegisterForSelectAll( selector ); } } else { ParticipantRadioButton selector = new ParticipantRadioButton(); selector.Name = "RowSelectorColumnSelector"; selector.ID = "RowSelectorColumnSelector"; cell.Controls.Add( selector ); selector.DataBinding += new EventHandler( this.selectorDataBinding ); } break; case ListItemType.Header: if ( AllowSelectAll && this.SelectionMode == ListSelectionMode.Multiple ) { selectAllControl = new System.Web.UI.HtmlControls.HtmlInputCheckBox(); selectAllControl.ID = "RowSelectorColumnAllSelector"; ApplyScriptToSelectAllCheckBox(); RegisterSelectAllScript(); cell.Controls.Add( selectAllControl ); } break; } } /**//// <summary> /// /// </summary> protected virtual void SetIndexValue( HtmlInputRadioButton radioSelector ) { DataGridItem row = radioSelector.NamingContainer as DataGridItem; if ( row != null ) { radioSelector.Value = row.ItemIndex.ToString(); } } /**//// <summary> /// Gets the checkbox appearing in the header row which controls the other checkboxes. /// </summary> /// <remarks>The checkbox if <see cref="AllowSelectAll"/> is true, otherwise null.</remarks> [Description("Gets the checkbox appearing in the header row which controls the other checkboxes.")] protected virtual System.Web.UI.HtmlControls.HtmlInputCheckBox SelectAllControl { get { return this.selectAllControl; } } #endregion Properties#region Properties /**//// <summary> /// Gets or sets the behavior of including a checkbox in the Header area which selects all the row checkboxes based on its value. /// </summary> /// <remarks>This behavior will only exist on browsers supporting javascript and the W3C DOM.</remarks> [ DefaultValue(false), Description("Gets or sets the behavior of including a checkbox in the Header area which selects all the row checkboxes based on its value.") ] public virtual Boolean AllowSelectAll { get { object savedState = null; savedState = this.ViewState["AllowSelectAll"]; if ( savedState != null ) { return (Boolean)savedState; } return false; } set { this.ViewState["AllowSelectAll"] = value; } } /**//// <summary> /// Gets or sets the selection mode of the <see cref="RowSelectorColumn"/>. /// </summary> /// <remarks> /// Use the SelectionMode property to specify the mode behavior of the <see cref="RowSelectorColumn"/>. /// Setting this property to ListSelectionMode.Single indicates only a single item can be selected, while ListSelectionMode.Multiple specifies multiple items can be selected. /// </remarks> [ DefaultValue(ListSelectionMode.Multiple), Description("Gets or sets the selection mode of the RowSelectorColumn.") ] public virtual ListSelectionMode SelectionMode { get { object savedState = null; savedState = this.ViewState["SelectionMode"]; if ( savedState != null ) { return (ListSelectionMode)savedState; } return ListSelectionMode.Multiple; } set { this.ViewState["SelectionMode"] = value; } } /**//// <summary> /// Gets an array of the DataGridItem indexes which are marked as selected. /// </summary> /// <remarks>The index can be used to get, for example, in the DataKeys collection to get the keys for the selected rows.</remarks> [ Browsable(false), Description("Gets an array of the DataGridItem indexes which are marked as selected.") ] public virtual Int32[] SelectedIndexes { get { System.Collections.ArrayList selectedIndexList = new System.Collections.ArrayList(); Int32 thisCellIndex = this.Owner.Columns.IndexOf(this); foreach( DataGridItem item in this.Owner.Items ) { Control foundControl = item.FindControl("RowSelectorColumnSelector"); System.Web.UI.HtmlControls.HtmlInputCheckBox Checkselector = foundControl as System.Web.UI.HtmlControls.HtmlInputCheckBox; System.Web.UI.HtmlControls.HtmlInputRadioButton radioselector = foundControl as System.Web.UI.HtmlControls.HtmlInputRadioButton; if ( Checkselector != null && Checkselector.Checked ) { selectedIndexList.Add( item.ItemIndex ); } else if ( radioselector != null && radioselector.Checked ) { selectedIndexList.Add( item.ItemIndex ); } } return (Int32[])selectedIndexList.ToArray(typeof( System.Int32 ) ); } } #endregion SelectAll Script#region SelectAll Script /**//// <summary> /// Applies to the SelectAll checkbox the javascript neccessary to create its behavior. /// </summary> [ Description("Applies to the SelectAll checkbox the javascript neccessary to create its behavior.")] protected virtual void ApplyScriptToSelectAllCheckBox() { selectAllControl.Attributes["onclick"] = "RowSelectorColumn_SelectAll( this );"; } /**//// <summary> /// Emits the script library neccessary for the SelectAll behavior. /// </summary> [Description("Emits the script library neccessary for the SelectAll behavior.")] protected virtual void RegisterSelectAllScript() { if ( this.Owner.Page != null ) { if ( !this.Owner.Page.IsClientScriptBlockRegistered("RowSelectorColumn Library") ) { ResourceManager manager = new ResourceManager( this.GetType() ); String script = manager.GetResourceSet(System.Globalization.CultureInfo.CurrentCulture, true, true).GetString("W3Cscript"); this.Owner.Page.RegisterClientScriptBlock("RowSelectorColumn Library", script ); } } } /**//// <summary> /// Registers the given checkbox as being bound to the SelectAll checkbox. /// </summary> /// <param name="selector">The checkbox being bound.</param> [Description("Registers the given checkbox as being bound to the SelectAll checkbox.")] protected virtual void RegisterForSelectAll( ParticipantCheckBox selector ) { selector.Master = this.selectAllControl; } #endregion Private#region Private private void selectorDataBinding( Object sender, EventArgs e ) { ParticipantRadioButton radio = sender as ParticipantRadioButton; if ( radio != null ) { this.SetIndexValue( radio ); } } private System.Web.UI.HtmlControls.HtmlInputCheckBox selectAllControl; #endregion Participant Controls#region Participant Controls /**//// <summary> /// The checkboxes which appear in each cell of a <see cref="RowSelectorColumn"/> when <see cref="RowSelectorColumn.SelectionMode"/> is set to <see cref="ListSelectionMode.Multiple"/>. /// </summary> public class ParticipantCheckBox : System.Web.UI.HtmlControls.HtmlInputCheckBox { /**//// <summary> /// Creates a new instance of the <see cref="ParticipantCheckBox"/> class. /// </summary> public ParticipantCheckBox() : base() { } /**//// <summary> /// Overrides <see cref="HtmlControl.Render"/>. /// </summary> protected override void Render( HtmlTextWriter writer ) { base.Render(writer); if ( master != null ) { LiteralControl script = new LiteralControl("/r/n<script language='javascript'>/r/nRowSelectorColumn_Register('" + master.ClientID + "', '" + this.ClientID + "')/r/n</script>"); script.RenderControl(writer); } } /**//// <summary> /// Gets or sets the checkbox which controls the checked state of this checkbox. /// </summary> public Control Master { get { return this.master; } set { this.master = value; } } private Control master; /**//// <summary> /// Overrides <see cref="HtmlInputCheckBox.OnPreRender"/>. /// </summary> protected override void OnPreRender(System.EventArgs e) { if ( master != null ) { this.Attributes["onclick"] = "RowSelectorColumn_CheckChildren( '" + this.Master.ClientID + "' );"; } base.OnPreRender(e); } } /**//// <summary> /// The radiobutton which appears in each cell of a <see cref="RowSelectorColumn"/> when <see cref="RowSelectorColumn.SelectionMode"/> is set to <see cref="ListSelectionMode.Single"/>. /// </summary> public class ParticipantRadioButton : System.Web.UI.HtmlControls.HtmlInputRadioButton, IPostBackDataHandler { /**//// <summary> /// Creates a new instance of the <see cref="ParticipantRadioButton"/> class. /// </summary> public ParticipantRadioButton() : base() { } IPostBackDataHandler Implementation#region IPostBackDataHandler Implementation /**//// <summary> /// This doesn't differ from the original implementaion /// except now i'm using my own RenderednameAttribute instead of the InputControl implementation. /// </summary> bool IPostBackDataHandler.LoadPostData( string postDataKey, NameValueCollection postCollection ) { bool result = false; string postedValue = postCollection[this.RenderedNameAttribute]; if (postedValue != null && postedValue == this.Value) { if ( this.Checked) { return result; } this.Checked = true; result = true; } else if (this.Checked) { this.Checked = false; } return result; } /**//// <summary> /// No change from the InputControl implementation /// </summary> void IPostBackDataHandler.RaisePostDataChangedEvent() { this.OnServerChange(EventArgs.Empty); } #endregion /**//// <summary> /// Overrides <see cref="HtmlInputRadioButton.RenderAttributes"/>. /// </summary> /// <remarks>Customized to use this implementation of RenderedNameAttribute</remarks> protected override void RenderAttributes(HtmlTextWriter writer ) { writer.WriteAttribute("value", this.Value); this.Attributes.Remove("value"); writer.WriteAttribute("name", this.RenderedNameAttribute); this.Attributes.Remove("name"); if (this.ID != null) { writer.WriteAttribute("id", this.ClientID); } this.Attributes.Render(writer); writer.Write(" /"); } /**//// <summary> /// Gets the final rendering of the Name attribute. /// </summary> /// <remarks> /// Differs from the standard RenderedNameAttribute to use the column as the logical naming container instead of the row. /// </remarks> protected virtual String RenderedNameAttribute { get { this.DiscoverContainers(); if ( parentCell == null || parentDataGridItem == null || parentDataGrid == null ) { return this.Name; } else { System.Text.StringBuilder groupContainer = new System.Text.StringBuilder(); groupContainer.Append( parentDataGrid.UniqueID ); groupContainer.Append( ":Column" ); groupContainer.Append( parentDataGridItem.Cells.GetCellIndex(parentCell).ToString() ); groupContainer.Append( ":" ); groupContainer.Append( this.Name ); return groupContainer.ToString(); } } } private TableCell parentCell; private DataGridItem parentDataGridItem; private DataGrid parentDataGrid; /**//// <summary> /// Looks up the control heirarchy to discover the container controls for this radiobutton /// </summary> protected virtual void DiscoverContainers() { if ( parentCell == null || parentDataGridItem == null || parentDataGrid == null ) { Control tempControl = this.NamingContainer; if ( tempControl is DataGridItem ) { parentDataGridItem = (DataGridItem)tempControl; parentDataGrid = (DataGrid)parentDataGridItem.NamingContainer; } tempControl = this.Parent; while( tempControl.Parent.UniqueID != parentDataGridItem.UniqueID ) { tempControl = tempControl.Parent; } if ( tempControl is TableCell ) { parentCell = (TableCell)tempControl; } } } } #endregion }}
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