TemplateField.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / TemplateField.cs / 1 / TemplateField.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Globalization;
    using System.Security.Permissions; 

 
    ///  
    ///    Defines the template for controls layout within a
    ///     
    ///    field.
    /// 
    //
 

    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class TemplateField : DataControlField {
 
        private ITemplate headerTemplate;
        private ITemplate footerTemplate;
        private ITemplate itemTemplate;
        private ITemplate editItemTemplate; 
        private ITemplate alternatingItemTemplate;
        private ITemplate insertItemTemplate; 
 

 
        /// 
        ///    Initializes a new instance of the  class.
        /// 
        public TemplateField() { 
        }
 
 
        /// 
        /// Specifies the  that defines how alternating items are rendered.  
        /// 
        [
            Browsable(false),
            DefaultValue(null), 
            WebSysDescription(SR.TemplateField_AlternatingItemTemplate),
            PersistenceMode(PersistenceMode.InnerProperty), 
            TemplateContainer(typeof(IDataItemContainer), BindingDirection.TwoWay) 
        ]
        public virtual ITemplate AlternatingItemTemplate { 
            get {
                return alternatingItemTemplate;
            }
            set { 
                alternatingItemTemplate = value;
                OnFieldChanged(); 
            } 
        }
 
        /// 
        ///    Gets or sets the property that determines whether the field treats empty string as
        ///    null when the field values are extracted.
        ///  
        [
            WebCategory("Behavior"), 
            DefaultValue(true), 
            WebSysDescription(SR.ImageField_ConvertEmptyStringToNull)
        ] 
        public virtual bool ConvertEmptyStringToNull {
            get {
                object o = ViewState["ConvertEmptyStringToNull"];
                if (o != null) { 
                    return (bool)o;
                } 
                return true; 
            }
            set { 
                ViewState["ConvertEmptyStringToNull"] = value;
            }
        }
 

        ///  
        /// Specifies the  that defines how rows in edit mode are rendered.  
        /// 
        [ 
            Browsable(false),
            DefaultValue(null),
            WebSysDescription(SR.TemplateField_EditItemTemplate),
            PersistenceMode(PersistenceMode.InnerProperty), 
            TemplateContainer(typeof(IDataItemContainer), BindingDirection.TwoWay)
        ] 
        public virtual ITemplate EditItemTemplate { 
            get {
                return editItemTemplate; 
            }
            set {
                editItemTemplate = value;
                OnFieldChanged(); 
            }
        } 
 

        ///  
        /// Specifies the  that defines how the control footer is rendered. 
        /// 
        [
            Browsable(false), 
            DefaultValue(null),
            WebSysDescription(SR.TemplateField_FooterTemplate), 
            PersistenceMode(PersistenceMode.InnerProperty), 
            TemplateContainer(typeof(IDataItemContainer))
        ] 
        public virtual ITemplate FooterTemplate {
            get {
                return footerTemplate;
            } 
            set {
                footerTemplate = value; 
                OnFieldChanged(); 
            }
        } 


        /// 
        /// Specifies the  
        /// that defines how the control header is rendered.
        ///  
        [ 
            Browsable(false),
            DefaultValue(null), 
            WebSysDescription(SR.TemplateField_HeaderTemplate),
            PersistenceMode(PersistenceMode.InnerProperty),
            TemplateContainer(typeof(IDataItemContainer))
        ] 
        public virtual ITemplate HeaderTemplate {
            get { 
                return headerTemplate; 
            }
            set { 
                headerTemplate = value;
                OnFieldChanged();
            }
        } 

 
        ///  
        /// Specifies the  that defines how rows in insert mode are rendered. 
        ///  
        [
            Browsable(false),
            DefaultValue(null),
            WebSysDescription(SR.TemplateField_InsertItemTemplate), 
            PersistenceMode(PersistenceMode.InnerProperty),
            TemplateContainer(typeof(IDataItemContainer), BindingDirection.TwoWay) 
        ] 
        public virtual ITemplate InsertItemTemplate {
            get { 
                return insertItemTemplate;
            }
            set {
                insertItemTemplate = value; 
                OnFieldChanged();
            } 
        } 

 
        /// 
        ///  Specifies the  that defines how items are rendered. 
        /// 
        [ 
            Browsable(false),
            DefaultValue(null), 
            WebSysDescription(SR.TemplateField_ItemTemplate), 
            PersistenceMode(PersistenceMode.InnerProperty),
            TemplateContainer(typeof(IDataItemContainer), BindingDirection.TwoWay) 
        ]
        public virtual ITemplate ItemTemplate {
            get {
                return itemTemplate; 
            }
            set { 
                itemTemplate = value; 
                OnFieldChanged();
            } 
        }

        protected override void CopyProperties(DataControlField newField) {
            ((TemplateField)newField).ConvertEmptyStringToNull = ConvertEmptyStringToNull; 
            ((TemplateField)newField).AlternatingItemTemplate = AlternatingItemTemplate;
            ((TemplateField)newField).ItemTemplate = ItemTemplate; 
            ((TemplateField)newField).FooterTemplate = FooterTemplate; 
            ((TemplateField)newField).EditItemTemplate = EditItemTemplate;
            ((TemplateField)newField).HeaderTemplate = HeaderTemplate; 
            ((TemplateField)newField).InsertItemTemplate = InsertItemTemplate;
            base.CopyProperties(newField);
        }
 
        protected override DataControlField CreateField() {
            return new TemplateField(); 
        } 

 
        /// 
        /// Extracts the value(s) from the given cell and puts the value(s) into a dictionary.  Indicate includeReadOnly
        /// to have readonly fields' values inserted into the dictionary.
        ///  
        public override void ExtractValuesFromCell(IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly) {
            IBindableTemplate bindableTemplate = ItemTemplate as IBindableTemplate; 
 
            if (((rowState & DataControlRowState.Alternate) != 0) && (AlternatingItemTemplate != null)) {
                bindableTemplate = AlternatingItemTemplate as IBindableTemplate; 
            }
            if (((rowState & DataControlRowState.Edit) != 0) && EditItemTemplate != null) {
                bindableTemplate = EditItemTemplate as IBindableTemplate;
            } 
            else if ((rowState & DataControlRowState.Insert) != 0 && InsertVisible) {
                if (InsertItemTemplate != null) { 
                    bindableTemplate = InsertItemTemplate as IBindableTemplate; 
                }
                else { 
                    if (EditItemTemplate != null) {
                        bindableTemplate = EditItemTemplate as IBindableTemplate;
                    }
                } 
            }
 
            if (bindableTemplate != null) { 
                bool convertEmptyStringToNull = ConvertEmptyStringToNull;
                foreach (DictionaryEntry entry in bindableTemplate.ExtractValues(cell.BindingContainer)) { 
                    object value = entry.Value;
                    if (convertEmptyStringToNull && value is string && ((string)value).Length == 0) {
                        dictionary[entry.Key] = null;
                    } 
                    else {
                        dictionary[entry.Key] = value; 
                    } 
                }
            } 
            return;
        }

 
        /// 
        ///  
        ///  
        public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex) {
            base.InitializeCell(cell, cellType, rowState, rowIndex); 

            ITemplate contentTemplate = null;
            switch (cellType) {
                case DataControlCellType.Header: 
                    contentTemplate = headerTemplate;
                    break; 
 
                case DataControlCellType.Footer:
                    contentTemplate = footerTemplate; 
                    break;

                case DataControlCellType.DataCell:
                    contentTemplate = itemTemplate; 
                    if ((rowState & DataControlRowState.Edit) != 0) {
                        if (editItemTemplate != null) { 
                            contentTemplate = editItemTemplate; 
                        }
                    } 
                    else if ((rowState & DataControlRowState.Insert) != 0) {
                        if (insertItemTemplate != null) {
                            contentTemplate = insertItemTemplate;
                        } 
                        else {
                            if (editItemTemplate != null) { 
                                contentTemplate = editItemTemplate; 
                            }
                        } 
                    }
                    else if ((rowState & DataControlRowState.Alternate) != 0) {
                        if (alternatingItemTemplate != null) {
                            contentTemplate = alternatingItemTemplate; 
                        }
                    } 
                    break; 
            }
 
            if (contentTemplate != null) {
                // The base class might have added a control or some text for some cases
                // such as header text which need to be removed before
                // the corresponding template is used. 
                // Note that setting text also has the effect of clearing out any controls.
                cell.Text = String.Empty; 
 
                contentTemplate.InstantiateIn(cell);
            } 
            else {
                if (cellType == DataControlCellType.DataCell) {
                    cell.Text = " ";
                } 
            }
        } 
 
        /// 
        /// Override with an empty body if the field's controls all support callback. 
        ///  Otherwise, override and throw a useful error message about why the field can't support callbacks.
        /// 
        public override void ValidateSupportsCallback() {
            throw new NotSupportedException(SR.GetString(SR.TemplateField_CallbacksNotSupported, Control.ID)); 
        }
    } 
}

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