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Я создал составной элемент управления, который изменяет элементы управления в нем на основе значения одного из его свойств, называемого «Тип». Цель состоит в том, что, как только это свойство «Тип» установлено, оно не изменяется снова для жизни элемента управления, поэтому элементы управления, отображаемые в результате значения свойства «Тип», не должны меняться.Не удалось загрузить viewstate с помощью составного элемента управления
Я переопределил методы LoadViewState и SaveViewState, как рекомендовано многими сообщениями в Интернете, но я все еще получаю сообщение об ошибке «Ошибка загрузки ViewState». Элемент управления будет соответствующим образом отображен при первой загрузке, но после того, как будет выполнен любой обратный вызов, он генерирует ошибку «Ошибка при загрузке ViewState».
Вот часть коды для составного элемента управления:
[Serializable]
internal enum SearchPanelControlType
{
Label,
DropDownList,
TextBox
}
[Serializable]
internal class SearchGridViewStateObject<T> where T : Bll.BaseCriteria
{
public T mySearchCriteria { get; set; }
public SearchGridType myType { get; set; }
public int myNumberOfChildrenPerRow { get; set; }
public object myBaseViewState { get; set; }
public SearchGridViewStateObject(T searchCriteria, SearchGridType type, int numberOfChildrenPerRow, object baseViewState)
{
mySearchCriteria = searchCriteria;
myType = type;
myNumberOfChildrenPerRow = numberOfChildrenPerRow;
myBaseViewState = baseViewState;
}
}
[Themeable(true)]
[Serializable]
public class SearchGrid<T> : CompositeControl
where T : Bll.BaseCriteria
{
#region Constructor
public SearchGrid()
{
}
#endregion
#region Private Fields
private MyCompanygridview myGridView;
private ObjectDataSource myObjectDataSource;
private Panel mySearchParametersPanel;
private Button mySearchButton;
private Button myClearSearchCriteriaButton;
private T mySearchCriteria;
//private SearchGridType myType = SearchGridType.Account;
private SearchGridType myType;
private int myNumberOfChildrenPerRow = 2;
private MyCompanygridviewSelectionType mySelectionType = MyCompanygridviewSelectionType.None;
private int mySelectColumnIndex = 0;
private int myPageSize = 10;
private int myPageIndex = 0;
private string myGridViewCssClass;
private string myCustomPagerButtonCssClass;
private string myCustomPagerTextBoxCssClass;
private string myRowCssClass;
private string myEmptyDataRowCssClass;
private string myPagerCssClass;
private string mySelectedRowCssClass;
private string myHeaderCssClass;
private string myAlternatingRowCssClass;
private string myDisabledRowCssClass;
private List<Guid> myGridViewDisabledValues = new List<Guid>();
private List<Guid> myGridViewSelectedValues = new List<Guid>();
private GridLines myGridLines = GridLines.None;
private string mySearchPanelButtonCssClass;
private string mySearchPanelTextBoxCssClass;
private string mySearchPanelDropDownListCssClass;
private string mySearchPanelLabelCssClass;
#endregion
#region Public Properties
/// <summary>
/// Gets or sets the search criteria.
/// </summary>
/// <value>The search criteria.</value>
public T SearchCriteria
{
get
{
return mySearchCriteria;
}
set
{
if (value != mySearchCriteria)
{
mySearchCriteria = value;
this.ChildControlsCreated = false;
this.EnsureChildControls();
}
}
}
/// <summary>
/// Gets or sets the type of items that should be shown in the gridview.
/// </summary>
/// <summary>
/// Gets or sets the type of items that should be shown in the gridview.
/// </summary>
[Category("SearchGrid"),
Description("Gets or sets the type of items that should be shown in the grid view."),
DefaultValue(null)]
public SearchGridType Type
{
get
{
return myType;
}
set
{
if (value != myType)
{
myType = value;
this.ChildControlsCreated = false;
this.EnsureChildControls();
}
}
}
[DefaultValue(MyCompanygridviewSelectionType.None),
Category("SearchGrid"),
Description("Indicates whether to use multiselection mode, single selection mode, or no selection mode.")]
public MyCompanygridviewSelectionType SelectionType
{
get
{
return mySelectionType;
}
set
{
mySelectionType = value;
}
}
#endregion
#region Overridden Methods
protected override void LoadViewState(object savedState)
{
SearchGridViewStateObject<T> vsObject = savedState as SearchGridViewStateObject<T>;
mySearchCriteria = vsObject.mySearchCriteria;
myType = vsObject.myType;
myNumberOfChildrenPerRow = vsObject.myNumberOfChildrenPerRow;
ClearChildViewState();
this.ChildControlsCreated = false;
this.EnsureChildControls();
base.LoadViewState(vsObject.myBaseViewState);
}
protected override object SaveViewState()
{
SearchGridViewStateObject<T> vsObject = new SearchGridViewStateObject<T>(mySearchCriteria, myType, myNumberOfChildrenPerRow, base.SaveViewState());
return vsObject;
}
protected override void RecreateChildControls()
{
EnsureChildControls();
}
protected override void CreateChildControls()
{
SearchGridParser parser = SearchGridParserFactory.GetParser(this.myType);
Controls.Clear();
//Define the Search Parameters Panel
mySearchParametersPanel = new Panel();
mySearchParametersPanel.ID = "spp" + Enum.GetName(typeof(SearchGridType), this.myType);
mySearchParametersPanel.DefaultButton = "btnSearch";
mySearchParametersPanel.ScrollBars = ScrollBars.None;
parser.CreateSearchPanelControls(ref mySearchParametersPanel, CreateSearchPanelStyleDictionary());
//Define Buttons
mySearchButton = new Button();
mySearchButton.ID = "btnSearch";
mySearchButton.Text = "Search";
mySearchButton.CausesValidation = false;
mySearchButton.UseSubmitBehavior = false;
mySearchButton.Click += new EventHandler(mySearchButton_Click);
if (!string.IsNullOrEmpty(mySearchPanelButtonCssClass))
{
mySearchButton.CssClass = mySearchPanelButtonCssClass;
}
myClearSearchCriteriaButton = new Button();
myClearSearchCriteriaButton.ID = "btnClearSearchCriteria";
myClearSearchCriteriaButton.Text = "Clear Search Criteria";
myClearSearchCriteriaButton.CausesValidation = false;
myClearSearchCriteriaButton.UseSubmitBehavior = false;
myClearSearchCriteriaButton.Click += new EventHandler(myClearSearchCriteriaButton_Click);
if (!string.IsNullOrEmpty(mySearchPanelButtonCssClass))
{
myClearSearchCriteriaButton.CssClass = mySearchPanelButtonCssClass;
}
mySearchParametersPanel.Controls.Add(mySearchButton);
mySearchParametersPanel.Controls.Add(myClearSearchCriteriaButton);
// Define the GridView
myGridView = new MyCompanygridview();
myGridView.ID = "gv" + Enum.GetName(typeof(SearchGridType), this.myType);
myGridView.AutoGenerateColumns = false;
myGridView.DataKeyNames = new string[] { "ID" };
myGridView.DataSourceID = "ods" + Enum.GetName(typeof(SearchGridType), this.myType);
myGridView.AllowSorting = true;
myGridView.Width = new System.Web.UI.WebControls.Unit("100%");
myGridView.AllowPaging = true;
myGridView.EnableCustomPager = true;
myGridView.Sorted += new EventHandler(myGridView_Sorted);
myGridView.PageIndexChanged += new EventHandler(myGridView_PageIndexChanged);
myGridView.PageSizeChanged += new EventHandler(myGridView_PageSizeChanged);
myGridView.PageSizeChanging += new EventHandler(myGridView_PageSizeChanging);
myGridView.SelectionType = this.mySelectionType;
myGridView.SelectColumnIndex = this.mySelectColumnIndex;
myGridView.PageSize = this.myPageSize;
myGridView.PageIndex = this.myPageIndex;
myGridView.CssClass = this.myGridViewCssClass;
myGridView.CustomPagerButtonCssStyle = this.myCustomPagerButtonCssClass;
myGridView.CustomPagerTextBoxCssStyle = this.myCustomPagerTextBoxCssClass;
myGridView.RowStyle.CssClass = this.myRowCssClass;
myGridView.EmptyDataRowStyle.CssClass = this.myEmptyDataRowCssClass;
myGridView.PagerStyle.CssClass = this.myPagerCssClass;
myGridView.SelectedRowStyle.CssClass = this.mySelectedRowCssClass;
myGridView.HeaderStyle.CssClass = this.myHeaderCssClass;
myGridView.AlternatingRowStyle.CssClass = this.myAlternatingRowCssClass;
myGridView.DisabledRowCssClass = this.myDisabledRowCssClass;
myGridView.DisabledValues = this.myGridViewDisabledValues;
myGridView.SelectedValues = this.myGridViewSelectedValues;
myGridView.GridLines = this.myGridLines;
parser.CreateGridViewColumns(ref myGridView);
// Define the object data source
myObjectDataSource = new ObjectDataSource();
myObjectDataSource.ID = "ods" + Enum.GetName(typeof(SearchGridType), this.myType);
myObjectDataSource.OldValuesParameterFormatString = "original_{0}";
myObjectDataSource.SelectMethod = "GetList";
myObjectDataSource.SelectCountMethod = "SelectCountForGetList";
myObjectDataSource.TypeName = "MyCompany.DCO.MyProject.Bll." + Enum.GetName(typeof(SearchGridType), this.myType) + "Manager";
myObjectDataSource.EnablePaging = true;
myObjectDataSource.StartRowIndexParameterName = "startRowIndex";
myObjectDataSource.MaximumRowsParameterName = "maximumRows";
myObjectDataSource.SortParameterName = "SortExpression";
myObjectDataSource.Selecting += new ObjectDataSourceSelectingEventHandler(myObjectDataSource_Selecting);
myObjectDataSource.Selected += new ObjectDataSourceStatusEventHandler(myObjectDataSource_Selected);
// Add the defined controls
this.Controls.Add(myObjectDataSource);
this.Controls.Add(myGridView);
this.Controls.Add(mySearchParametersPanel);
parser.SetSearchPanelControls<T>(this.mySearchCriteria, ref mySearchParametersPanel);
}
protected override void Render(HtmlTextWriter writer)
{
AddAttributesToRender(writer);
writer.RenderBeginTag(HtmlTextWriterTag.Div);
mySearchParametersPanel.RenderControl(writer);
writer.RenderBeginTag(HtmlTextWriterTag.Br);
writer.RenderEndTag();
myGridView.RenderControl(writer);
writer.RenderBeginTag(HtmlTextWriterTag.Br);
writer.RenderEndTag();
myObjectDataSource.RenderControl(writer);
writer.RenderEndTag();
}
#endregion
}
Вот код для файла «парсер», который создает пользовательские элементы управления:
class SearchGridParser_ApplicationFunction : SearchGridParser
{
internal override void CreateGridViewColumns(ref MyCompanygridview myGridView)
{
// Link Column
HyperLinkField linkColumn = new HyperLinkField();
linkColumn.Text = "Edit";
linkColumn.HeaderText = "ID";
linkColumn.DataNavigateUrlFields = new string[] { "ID" };
linkColumn.DataNavigateUrlFormatString = "~/AddEdit/ApplicationFunction/default.aspx?Action=Edit&ID={0}";
myGridView.Columns.Add(linkColumn);
// Name Column
BoundField nameColumn = new BoundField();
nameColumn.DataField = "Name";
nameColumn.HeaderText = "Name";
nameColumn.SortExpression = "Name";
myGridView.Columns.Add(nameColumn);
// Description Column
BoundField descriptionColumn = new BoundField();
descriptionColumn.DataField = "Description";
descriptionColumn.HeaderText = "Description";
descriptionColumn.SortExpression = "Description";
myGridView.Columns.Add(descriptionColumn);
// Business Criticality Column
TemplateField businessCriticalityColumn = new TemplateField();
businessCriticalityColumn.SortExpression = "BusinessCriticality";
businessCriticalityColumn.HeaderText = "Criticality";
businessCriticalityColumn.ItemTemplate = new LabelColumnGridViewTemplate(ListItemType.Item, "BusinessCriticality", "Name");
myGridView.Columns.Add(businessCriticalityColumn);
// Disabled Column
CheckBoxField disabledColumn = new CheckBoxField();
disabledColumn.DataField = "DisabledFlg";
disabledColumn.HeaderText = "Disabled";
disabledColumn.SortExpression = "DisabledFlg";
myGridView.Columns.Add(disabledColumn);
// Agencies Column
TemplateField agenciesColumn = new TemplateField();
agenciesColumn.HeaderText = "Agencies";
agenciesColumn.ItemTemplate = new ChildObjectsGridViewTemplate(ListItemType.Item, 2, "Agencies", "Agency.Abbreviation");
myGridView.Columns.Add(agenciesColumn);
// Applications Column
TemplateField applicationsColumn = new TemplateField();
applicationsColumn.HeaderText = "Applications";
applicationsColumn.ItemTemplate = new ChildObjectsGridViewTemplate(ListItemType.Item, 2, "Applications", "Application.Name");
myGridView.Columns.Add(applicationsColumn);
}
internal override void CreateSearchPanelControls(ref Panel myPanel, Dictionary<SearchPanelControlType, string> myStyleDictionary)
{
if (myStyleDictionary == null)
{
myStyleDictionary = new Dictionary<SearchPanelControlType, string>();
}
// Title
Literal myTitleStart = new Literal();
myTitleStart.Text = "<h4>";
Label myTitle = new Label();
myTitle.Text = "Application Function:";
myTitle.ID = "lblTitle";
Literal myTitleEnd = new Literal();
myTitleEnd.Text = "</h4>";
// Begin Table
Table myTable = new Table();
myTable.ID = "myTable";
// Create First Row
TableRow myTableRow1 = new TableRow();
myTableRow1.ID = "myTableRow1";
// Search by Name
TableCell myNameLabelTableCell = new TableCell();
myNameLabelTableCell.ID = "myNameLabelTableCell";
Label myNameLabel = new Label();
myNameLabel.ID = "lblName";
myNameLabel.Text = "Name:";
myNameLabel.AssociatedControlID = "txtName";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.Label))
{
myNameLabel.CssClass = myStyleDictionary[SearchPanelControlType.Label];
}
myNameLabelTableCell.Controls.Add(myNameLabel);
myTableRow1.Cells.Add(myNameLabelTableCell);
TableCell myNameUserInputTableCell = new TableCell();
myNameUserInputTableCell.ID = "myNameUserInputTableCell";
TextBox myNameTextBox = new TextBox();
myNameTextBox.ID = "txtName";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.TextBox))
{
myNameTextBox.CssClass = myStyleDictionary[SearchPanelControlType.TextBox];
}
myNameUserInputTableCell.Controls.Add(myNameTextBox);
myTableRow1.Cells.Add(myNameUserInputTableCell);
// Search by Agency
TableCell myAgencyLabelTableCell = new TableCell();
myAgencyLabelTableCell.ID = "myAgencyLabelTableCell";
Label myAgencyLabel = new Label();
myAgencyLabel.ID = "lblAgency";
myAgencyLabel.Text = "Agency:";
myAgencyLabel.AssociatedControlID = "ddlAgency";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.Label))
{
myAgencyLabel.CssClass = myStyleDictionary[SearchPanelControlType.Label];
}
myAgencyLabelTableCell.Controls.Add(myAgencyLabel);
myTableRow1.Cells.Add(myAgencyLabelTableCell);
TableCell myAgencyUserInputTableCell = new TableCell();
myAgencyUserInputTableCell.ID = "myAgencyUserInputTableCell";
DropDownList<AgencyCriteria> myAgencyDDL = new DropDownList<AgencyCriteria>();
myAgencyDDL.Type = DropDownListType.Agency;
myAgencyDDL.ID = "ddlAgency";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.DropDownList))
{
myAgencyDDL.CssClass = myStyleDictionary[SearchPanelControlType.DropDownList];
}
myAgencyDDL.DisplayDisabled = true;
myAgencyDDL.EnableAnyOption = true;
myAgencyDDL.DataBind();
myAgencyUserInputTableCell.Controls.Add(myAgencyDDL);
myTableRow1.Cells.Add(myAgencyUserInputTableCell);
myTable.Rows.Add(myTableRow1);
// Create Second row
TableRow myTableRow2 = new TableRow();
myTableRow2.ID = "myTableRow2";
// Search by BusinessCriticality
TableCell myBusinessCriticalityLabelTableCell = new TableCell();
myBusinessCriticalityLabelTableCell.ID = "myBusinessCriticalityLabelTableCell";
Label myBusinessCriticalityLabel = new Label();
myBusinessCriticalityLabel.ID = "lblBusinessCriticality";
myBusinessCriticalityLabel.Text = "Criticality:";
myBusinessCriticalityLabel.AssociatedControlID = "ddlBusinessCriticality";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.Label))
{
myBusinessCriticalityLabel.CssClass = myStyleDictionary[SearchPanelControlType.Label];
}
myBusinessCriticalityLabelTableCell.Controls.Add(myBusinessCriticalityLabel);
myTableRow2.Cells.Add(myBusinessCriticalityLabelTableCell);
TableCell myBusinessCriticalityUserInputTableCell = new TableCell();
myBusinessCriticalityUserInputTableCell.ID = "myBusinessCriticalityUserInputTableCell";
DropDownList<LookupCodeCriteria> myBusinessCriticalityDDL = new DropDownList<LookupCodeCriteria>();
myBusinessCriticalityDDL.Type = DropDownListType.LookupCode;
myBusinessCriticalityDDL.ID = "ddlBusinessCriticality";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.DropDownList))
{
myBusinessCriticalityDDL.CssClass = myStyleDictionary[SearchPanelControlType.DropDownList];
}
myBusinessCriticalityDDL.DisplayDisabled = true;
myBusinessCriticalityDDL.EnableAnyOption = true;
LookupCodeCriteria myBusinessCriticalityCriteria = new LookupCodeCriteria();
myBusinessCriticalityCriteria.Type = LookupCodeType.BusinessCriticality;
myBusinessCriticalityDDL.OtherCriteria = myBusinessCriticalityCriteria;
myBusinessCriticalityDDL.DataBind();
myBusinessCriticalityUserInputTableCell.Controls.Add(myBusinessCriticalityDDL);
myTableRow2.Cells.Add(myBusinessCriticalityUserInputTableCell);
// Search by DisabledFlg
TableCell myDisabledFlgLabelTableCell = new TableCell();
myDisabledFlgLabelTableCell.ID = "myDisabledFlgLabelTableCell";
Label myDisabledFlgLabel = new Label();
myDisabledFlgLabel.ID = "lblDisabledFlg";
myDisabledFlgLabel.Text = "Disabled:";
myDisabledFlgLabel.AssociatedControlID = "ddlDisabledFlg";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.Label))
{
myDisabledFlgLabel.CssClass = myStyleDictionary[SearchPanelControlType.Label];
}
myDisabledFlgLabelTableCell.Controls.Add(myDisabledFlgLabel);
myTableRow2.Cells.Add(myDisabledFlgLabelTableCell);
TableCell myDisabledFlgUserInputTableCell = new TableCell();
myDisabledFlgUserInputTableCell.ID = "myDisabledFlgUserInputTableCell";
YesNoAnyDropDownList myDisabledFlgDDL = new YesNoAnyDropDownList();
myDisabledFlgDDL.ID = "ddlDisabledFlg";
if (myStyleDictionary.ContainsKey(SearchPanelControlType.DropDownList))
{
myDisabledFlgDDL.CssClass = myStyleDictionary[SearchPanelControlType.DropDownList];
}
myDisabledFlgDDL.DataBind();
myDisabledFlgUserInputTableCell.Controls.Add(myDisabledFlgDDL);
myTableRow2.Cells.Add(myDisabledFlgUserInputTableCell);
myTable.Rows.Add(myTableRow2);
myPanel.Controls.Add(myTitleStart);
myPanel.Controls.Add(myTitle);
myPanel.Controls.Add(myTitleEnd);
myPanel.Controls.Add(myTable);
}
internal override void FillSearchCriteria<T>(T myCriteria, ref Panel myPanel)
{
ApplicationFunctionCriteria derivedCriteria = new ApplicationFunctionCriteria();
if (myCriteria != null)
{
derivedCriteria = myCriteria as ApplicationFunctionCriteria;
}
// Name
TextBox myNameTextBox = (TextBox)myPanel.FindControl("myTable").FindControl("myTableRow1").FindControl("myNameUserInputTableCell").FindControl("txtName");
if (!string.IsNullOrEmpty(myNameTextBox.Text.Trim()))
{
derivedCriteria.Name = myNameTextBox.Text.Trim();
}
else
{
derivedCriteria.Name = string.Empty;
}
// AgencyID
DropDownList<AgencyCriteria> myAgencyDDL = (DropDownList<AgencyCriteria>)myPanel.FindControl("myTable").FindControl("myTableRow1").FindControl("myAgencyUserInputTableCell").FindControl("ddlAgency");
Guid myAgencyID;
if (myAgencyDDL.SelectedValue.TryParseGuid(out myAgencyID))
{
derivedCriteria.AgencyID = myAgencyID;
}
else
{
derivedCriteria.AgencyID = null;
}
// BusinessCriticalityID
DropDownList<LookupCodeCriteria> myBusinessCriticalityDDL = (DropDownList<LookupCodeCriteria>)myPanel.FindControl("myTable").FindControl("myTableRow2").FindControl("myBusinessCriticalityUserInputTableCell").FindControl("ddlBusinessCriticality");
Guid myBusinessCriticalityID;
if (myBusinessCriticalityDDL.SelectedValue.TryParseGuid(out myBusinessCriticalityID))
{
derivedCriteria.BusinessCriticalityID = myBusinessCriticalityID;
}
else
{
derivedCriteria.BusinessCriticalityID = null;
}
// DisabledFlg
YesNoAnyDropDownList myDisabledFlgDDL = (YesNoAnyDropDownList)myPanel.FindControl("myTable").FindControl("myTableRow2").FindControl("myDisabledFlgUserInputTableCell").FindControl("ddlDisabledFlg");
bool myDisabledFlg;
if (bool.TryParse(myDisabledFlgDDL.SelectedValue, out myDisabledFlg))
{
derivedCriteria.DisabledFlg = myDisabledFlg;
}
else
{
derivedCriteria.DisabledFlg = null;
}
}
internal override void SetSearchPanelControls<T>(T myCriteria, ref Panel myPanel)
{
ApplicationFunctionCriteria derivedCriteria = new ApplicationFunctionCriteria();
if (myCriteria != null)
{
derivedCriteria = myCriteria as ApplicationFunctionCriteria;
}
// Name
TextBox myNameTextBox = (TextBox)myPanel.FindControl("myTable").FindControl("myTableRow1").FindControl("myNameUserInputTableCell").FindControl("txtName");
myNameTextBox.Text = derivedCriteria.Name;
// AgencyID
DropDownList<AgencyCriteria> myAgencyDDL = (DropDownList<AgencyCriteria>)myPanel.FindControl("myTable").FindControl("myTableRow1").FindControl("myAgencyUserInputTableCell").FindControl("ddlAgency");
if (derivedCriteria.AgencyID.HasValue)
{
myAgencyDDL.SelectedValue = derivedCriteria.AgencyID.ToString();
}
else
{
myAgencyDDL.SelectedValue = "0";
}
// BusinessCriticalityID
DropDownList<LookupCodeCriteria> myBusinessCriticalityDDL = (DropDownList<LookupCodeCriteria>)myPanel.FindControl("myTable").FindControl("myTableRow2").FindControl("myBusinessCriticalityUserInputTableCell").FindControl("ddlBusinessCriticality");
if (derivedCriteria.BusinessCriticalityID.HasValue)
{
myBusinessCriticalityDDL.SelectedValue = derivedCriteria.BusinessCriticalityID.ToString();
}
else
{
myBusinessCriticalityDDL.SelectedValue = "0";
}
// DisabledFlg
YesNoAnyDropDownList myDisabledFlgDDL = (YesNoAnyDropDownList)myPanel.FindControl("myTable").FindControl("myTableRow2").FindControl("myDisabledFlgUserInputTableCell").FindControl("ddlDisabledFlg");
if (derivedCriteria.DisabledFlg.HasValue)
{
myDisabledFlgDDL.SelectedValue = derivedCriteria.DisabledFlg.ToString();
}
else
{
myDisabledFlgDDL.SelectedValue = "any";
}
}
}
Вот код на страница ASPX Я использую для проверки управления:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
</html>
И в CodeBehind:
public partial class test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
CustomWebControls.SearchGrid<AccountCriteria> myAppFuncGrid = new MyCompany.DCO.MyProject.CustomWebControls.SearchGrid<AccountCriteria>();
myAppFuncGrid.Type = MyCompany.DCO.MyProject.CustomWebControls.SearchGridType.Account;
myAppFuncGrid.SelectionType = MyCompany.DCO.Library.WebControls.MyCompanygridviewSelectionType.Multiple;
myAppFuncGrid.PageSize = 3;
PlaceHolder1.Controls.Add(myAppFuncGrid);
}
}
Я попытался только поставить элемент управления в if (! Page.IsPostBack), но тогда он просто даже не отображает элемент управления на Postback. Что я делаю не так?
UPDATE: Поэтому я добавил это к композитному управления:
protected override void OnInit(EventArgs e)
{
this.CreateChildControls(); base.OnInit(e);
}
И теперь я больше не получить «не удалось загрузить ViewState» ошибку, но мне кажется, что ViewState из дочерних элементов управления не сохранен через обратную передачу. Одним из элементов управления в моем составном элементе управления является gridview с включенным пейджингом, и при нажатии на следующей странице он перейдет на страницу два, но никогда на страницу 3 или 4 или около того. Но он перейдет на «последнюю страницу», «первую страницу» без проблем. Но следующая страница и предыдущая страница не работают правильно, но также не вызывают ошибки. Идеи?
Я уже пытался добавить элемент управления в методе OnInit страницы, но он ведет себя одинаково. –
Кроме того, я поставил элемент управления на странице декларативно, и он имеет такое же поведение. –