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//
// System.Web.UI.WebControls.DataBoundControl
//
// Authors:
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2003 Ben Maurer
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Collections;
using System.Collections.Specialized;
using System.Text;
using System.Web.Util;
using System.ComponentModel;
namespace System.Web.UI.WebControls {
public abstract class DataBoundControl : WebControl
{
public event EventHandler DataBound;
protected DataBoundControl ()
{
}
public sealed override void DataBind ()
{
PerformDataBinding ();
RequiresDataBinding = false;
OnDataBound (EventArgs.Empty);
}
protected void EnsureDataBound ()
{
if (RequiresDataBinding && DataSourceID != "")
DataBind ();
}
protected virtual object GetDataSourceObject()
{
if (DataSourceID != "")
return (IDataSource) NamingContainer.FindControl (DataSourceID);
return DataSource;
}
protected virtual IEnumerable GetResolvedDataSource ()
{
if (DataSource != null && DataSourceID != "")
throw new HttpException ();
IDataSource ds = GetDataSourceObject () as IDataSource;
if (ds != null && DataSourceID != "")
return ds.GetView (DataMember).Select ();
else if (DataSource != null)
return DataSourceHelper.GetResolvedDataSource (DataSource, DataMember);
else
return null;
}
protected bool IsBoundToDataSourceControl()
{
return (GetDataSourceObject () is IDataSource) && DataSourceID != "";
}
protected virtual void OnDataBound(EventArgs e) {
if (DataBound != null)
DataBound (this, e);
}
protected virtual void OnDataPropertyChanged ()
{
this.RequiresDataBinding = true;
}
protected virtual void OnDataSourceChanged (object sender, EventArgs e)
{
RequiresDataBinding = true;
}
// should be `internal protected' (why, oh WHY did they do that !?!)
protected override void OnInit (EventArgs e)
{
base.OnInit(e);
inited = true;
if (!Page.IsPostBack)
RequiresDataBinding = true;
}
// should be `internal protected' (why, oh WHY did they do that !?!)
protected override void OnLoad (EventArgs e)
{
IDataSource ds = GetDataSourceObject () as IDataSource;
if (ds != null && DataSourceID != "")
ds.DataSourceChanged += new EventHandler (OnDataSourceChanged);
base.OnLoad(e);
}
// should be `internal protected' (why, oh WHY did they do that !?!)
protected override void OnPreRender (EventArgs e)
{
EnsureDataBound ();
base.OnPreRender (e);
}
protected virtual void PerformDataBinding ()
{
OnDataBinding(EventArgs.Empty);
}
protected virtual void ValidateDataSource (object dataSource)
{
if (dataSource is IListSource || dataSource is IEnumerable)
return;
throw new ArgumentException ();
}
public string DataMember
{
get {
object o = ViewState["DataMember"];
if(o!=null)
return (string)o;
return String.Empty;
}
set {
ViewState["DataMember"] = value;
}
}
object dataSource;
public virtual object DataSource
{
get {
return dataSource;
}
set {
ValidateDataSource (value);
dataSource = value;
}
}
public virtual string DataSourceID {
get {
object o = ViewState ["DataSourceID"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
if (inited)
RequiresDataBinding = true;
ViewState ["DataSourceID"] = value;
}
}
bool requiresDataBinding;
protected bool RequiresDataBinding {
get { return requiresDataBinding; }
set { requiresDataBinding = value; }
}
protected bool inited;
}
}
#endif
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