我有一个动态创建的Checkboxlist（我正在使用动态数据，我正在谈论 Many-to-many_edit.aspx）。我已经添加了 20 000 多个项目Checkboxlist，我需要为此进行分页。
我认为将其绑定checkboxlist到 agridview可以解决问题吗？我怎样才能做到这一点 ？
编辑：我已经阅读了很多关于这个主题的内容，但我找不到任何好的东西。当我尝试放入Checkboxlist's source时，GridView.DatSource它会抛出OutOfMemory异常
EDIT2：我正在尝试这样的事情，但是现在，因为我checkboxlist的它在里面，gridview我不知道如何填充它了
代码示例：
asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatColumns="3" OnDataBound="CheckBoxList1_DataBound" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
编辑3：
我的代码 aspx.cs
public partial class ManyToMany_EditField : System.Web.DynamicData.FieldTemplateUserControl
{
public void Page_Load(object sender, EventArgs e)
{
// Register for the DataSource's updating event
EntityDataSource ds = (EntityDataSource)this.FindDataSourceControl();
// This field template is used both for Editing and Inserting
ds.Updating += new EventHandler<EntityDataSourceChangingEventArgs>(DataSource_UpdatingOrInserting);
ds.Inserting += new EventHandler<EntityDataSourceChangingEventArgs>(DataSource_UpdatingOrInserting);
}
private void DataSource_UpdatingOrInserting(object sender, EntityDataSourceChangingEventArgs e)
{
MetaTable childTable = ChildrenColumn.ChildTable;
// Comments assume employee/territory for illustration, but the code is generic
// Get the collection of territories for this employee
RelatedEnd entityCollection = (RelatedEnd)Column.EntityTypeProperty.GetValue(e.Entity, null);
// In Edit mode, make sure it's loaded (doesn't make sense in Insert mode)
if (Mode == DataBoundControlMode.Edit && !entityCollection.IsLoaded)
{
entityCollection.Load();
}
// Get an IList from it (i.e. the list of territories for the current employee)
// REVIEW: we should be using EntityCollection directly, but EF doesn't have a
// non generic type for it. They will add this in vnext
IList entityList = ((IListSource)entityCollection).GetList();
// Go through all the territories (not just those for this employee)
foreach (object childEntity in childTable.GetQuery(e.Context))
{
// Check if the employee currently has this territory
bool isCurrentlyInList = entityList.Contains(childEntity);
// Find the checkbox for this territory, which gives us the new state
string pkString = childTable.GetPrimaryKeyString(childEntity);
ListItem listItem = CheckBoxList1.Items.FindByValue(pkString);
if (listItem == null)
continue;
// If the states differs, make the appropriate add/remove change
if (listItem.Selected)
{
if (!isCurrentlyInList)
entityList.Add(childEntity);
}
else
{
if (isCurrentlyInList)
entityList.Remove(childEntity);
}
}
}
protected void CheckBoxList1_DataBound(object sender, EventArgs e)
{
MetaTable childTable = ChildrenColumn.ChildTable;
var a = childTable.CreateContext();
var dataSource = childTable.GetQuery().AsQueryable();
var Context = new testEntities();
var daZtaSource = Context.GetType();
GridView1.DataSource = dataSource;
// Comments assume employee/territory for illustration, but the code is generic
IList entityList = null;
ObjectContext objectContext = null;
if (Mode == DataBoundControlMode.Edit)
{
object entity;
ICustomTypeDescriptor rowDescriptor = Row as ICustomTypeDescriptor;
if (rowDescriptor != null)
{
// Get the real entity from the wrapper
entity = rowDescriptor.GetPropertyOwner(null);
}
else
{
entity = Row;
}
// Get the collection of territories for this employee and make sure it's loaded
RelatedEnd entityCollection = Column.EntityTypeProperty.GetValue(entity, null) as RelatedEnd;
if (entityCollection == null)
{
throw new InvalidOperationException(String.Format("The ManyToMany template does not support the collection type of the '{0}' column on the '{1}' table.", Column.Name, Table.Name));
}
if (!entityCollection.IsLoaded)
{
entityCollection.Load();
}
// Get an IList from it (i.e. the list of territories for the current employee)
// REVIEW: we should be using EntityCollection directly, but EF doesn't have a
// non generic type for it. They will add this in vnext
entityList =((IListSource)entityCollection).GetList();
// Get the current ObjectContext
// REVIEW: this is quite a dirty way of doing this. Look for better alternative
ObjectQuery objectQuery = (ObjectQuery)entityCollection.GetType().GetMethod(
"CreateSourceQuery").Invoke(entityCollection, null);
objectContext = objectQuery.Context;
}
// Go through all the territories (not just those for this employee)
foreach (object childEntity in childTable.GetQuery(objectContext))
{
MetaTable actualTable = MetaTable.GetTable(childEntity.GetType());
// Create a checkbox for it
ListItem listItem = new ListItem(
actualTable.GetDisplayString(childEntity),
actualTable.GetPrimaryKeyString(childEntity));
// Make it selected if the current employee has that territory
if (Mode == DataBoundControlMode.Edit)
{
listItem.Selected = entityList.Contains(childEntity);
}
CheckBoxList1.Items.Add(listItem);
}
}
public override Control DataControl
{
get
{
return CheckBoxList1;
}
}
}
我的代码：Apx
<%@ Control Language="C#" CodeFile="ManyToMany_Edit.ascx.cs" Inherits="ManyToMany_EditField" %>
<asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatColumns="3" OnDataBound="CheckBoxList1_DataBound" />