Echec du chargement de viewstate avec un contrôle composite

Question

J'ai créé un contrôle composite qui modifie les contrôles en fonction de la valeur de l'une de ses propriétés appelée "Type". L'intention est qu'une fois que cette propriété "Type" est définie, elle n'est pas modifiée à nouveau pour la durée de vie du contrôle, de sorte que les contrôles rendus en résultat de la valeur de la propriété "Type" ne doivent pas changer.

J'ai remplacé les méthodes LoadViewState et SaveViewState recommandées par de nombreux messages sur Internet, mais je reçois toujours une erreur concernant "Impossible de charger ViewState". Le contrôle s'affichera de manière appropriée sur le premier chargement, mais une fois que toute publication est effectuée, il génère l'erreur «Échec de chargement ViewState».

Voici une partie du code pour le contrôle composite:

[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 

} 

Voici le code du fichier « analyseur » qui crée les contrôles personnalisés:

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"; 
     } 

    } 
} 

Voici le code sur la page ASPX J'utilise pour tester le contrôle:

<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> 

Et le codebehind:

J'ai essayé de placer le contrôle dans if (! Qu'est-ce que je fais mal?

MISE À JOUR: Je a ajouté à la commande composite:

protected override void OnInit(EventArgs e) 
{ 
this.CreateChildControls(); base.OnInit(e); 
} 

Et maintenant, je ne l'erreur « Impossible de charger viewstate », mais il semble que le viewstate des contrôles enfants ne sont pas enregistré à travers les publications. L'un des contrôles dans mon contrôle composite est une grille avec pagination activée et lorsque vous cliquez sur la page suivante, il ira à la page deux, mais jamais à la page 3 ou 4 ou ainsi de suite. Mais il ira à "dernière page", "première page" sans problème. Mais la page suivante et la page précédente ne fonctionnent pas correctement, mais elles ne génèrent pas d'erreur non plus. Des idées?

Answer 1

Lorsque vous ajoutez dynamiquement votre contrôle à votre page, essayez de surcharger OnInit ou CreateChildControls et de le faire à cet endroit.

Viewstate est chargé dans la phase de pré-charge et, par conséquent, il ne peut pas charger viewstate pour vos contrôles, car ils n'existent encore ...