DynamicHyperLink.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / DynamicHyperLink.cs / 1305376 / DynamicHyperLink.cs
                        
                        
                            using System.Collections.Generic; 
using System.ComponentModel;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Drawing; 
using System.Globalization;
using System.Security.Permissions; 
using System.Web.Compilation; 
using System.Web.Resources;
using System.Web.Routing; 
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.DynamicData.Util;
 
namespace System.Web.DynamicData {
    ///  
    /// A control that displays links to table actions based on routing rules. It will not generate links for actions that are not 
    /// allowed by the routing rules. It can work in 3 modes: explicit, databinding to MetaTable, or databinding to a data row.
    /// Databinding to MetaTable allows for creating links to actions for a collection of MetaTable objects (such as in the Default.aspx 
    /// page in the project templates)
    /// Databinding to a data row allows for creating links to actions for data rows retrieved from a database. These are usually used with
    /// Edit and Details actions.
    /// Explicit mode allows for links to non-item-specific actions (like List and Insert) and is achieved by properly setting 
    /// ContextTypeName, Table, and Action properties. This is done in the PreRender phase if the NavigateUrl property is null (i.e. it has not
    /// been set explicitly or did not get set in one of the databinding scenarios.) 
    /// Extra route parameters can be provided by declaring expando attributes on the controls markup. 
    /// 
    [SuppressMessage("Microsoft.Naming", "CA1702:CompoundWordsShouldBeCasedCorrectly", MessageId = "HyperLink", Justification="It's an extension of the HyperLink class")] 
    [DefaultProperty("Action")]
    [ToolboxBitmap(typeof(DynamicHyperLink), "DynamicHyperLink.bmp")]
    public class DynamicHyperLink : HyperLink, IAttributeAccessor {
        private HttpContextBase _context; 
        private bool _dataBound;
        private object _dataItem; 
        private Dictionary _extraRouteParams = new Dictionary(); 

        ///  
        /// The name of the action
        /// 
        [TypeConverter(typeof(ActionConverter))]
        [DefaultValue("")] 
        [Category("Navigation")]
        [ResourceDescription("DynamicHyperLink_Action")] 
        public string Action { 
            get {
                object o = ViewState["Action"]; 
                return (o == null ? String.Empty: (string)o);
            }
            set {
                ViewState["Action"] = value; 
            }
        } 
 
        internal new HttpContextBase Context {
            get { 
                return _context ?? new HttpContextWrapper(base.Context);
            }
            set {
                _context = value; 
            }
        } 
 
        /// 
        /// The name of the context type 
        /// 
        [DefaultValue("")]
        [Category("Navigation")]
        [ResourceDescription("DynamicHyperLink_ContextTypeName")] 
        public string ContextTypeName {
            get { 
                object o = ViewState["ContextTypeName"]; 
                return ((o == null) ? String.Empty : (string)o);
            } 
            set {
                ViewState["ContextTypeName"] = value;
            }
        } 

        ///  
        /// The name of the column whose value will be used to populate the Text 
        /// property if it is not already set in data binding scenarios.
        ///  
        [DefaultValue("")]
        [Category("Navigation")]
        [ResourceDescription("DynamicHyperLink_DataField")]
        public string DataField { 
            get {
                object o = ViewState["DataField"]; 
                return ((o == null) ? String.Empty : (string)o); 
            }
            set { 
                ViewState["DataField"] = value;
            }
        }
 
        // for unit testing purposes
        internal object Page_DataItem { 
            get { 
                return _dataItem ?? Page.GetDataItem();
            } 
            set {
                _dataItem = value;
            }
        } 

        ///  
        /// The name of the table 
        /// 
        [DefaultValue("")] 
        [Category("Navigation")]
        [ResourceDescription("DynamicHyperLink_TableName")]
        public string TableName {
            get { 
                object o = ViewState["TableName"];
                return ((o == null) ? String.Empty : (string)o); 
            } 
            set {
                ViewState["TableName"] = value; 
            }
        }

        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")] 
        protected override void OnDataBinding(EventArgs e) {
            base.OnDataBinding(e); 
 
            if (DesignMode) {
                return; 
            }

            if (!String.IsNullOrEmpty(NavigateUrl)) {
                // stop processing if there already is a URL 
                return;
            } 
 
            if (!String.IsNullOrEmpty(TableName) || !String.IsNullOrEmpty(ContextTypeName)) {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, 
                    DynamicDataResources.DynamicHyperLink_CannotSetTableAndContextWhenDatabinding, this.ID));
            }

            object dataItem = Page_DataItem; 
            if (dataItem == null) {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, 
                    DynamicDataResources.DynamicHyperLink_CannotBindToNull, this.ID)); 
            }
 
            MetaTable table = dataItem as MetaTable;
            if (table != null) {
                BindToMetaTable(table);
            } else { 
                BindToDataItem(dataItem);
            } 
 
            _dataBound = true;
        } 

        private void BindToMetaTable(MetaTable table) {
            string action = GetActionOrDefaultTo(PageAction.List);
            NavigateUrl = table.GetActionPath(action, GetRouteValues()); 
            if (String.IsNullOrEmpty(Text)) {
                Text = table.DisplayName; 
            } 
        }
 
        private void BindToDataItem(object dataItem) {
            dataItem = Misc.GetRealDataItem(dataItem);
            Debug.Assert(dataItem != null, "DataItem is null");
            // Try to get the MetaTable from the type and if we can't find it then ---- up. 
            MetaTable table = Misc.GetTableFromTypeHierarchy(dataItem.GetType());
            if (table == null) { 
                throw new InvalidOperationException(String.Format( 
                    CultureInfo.CurrentCulture,
                    DynamicDataResources.MetaModel_EntityTypeDoesNotBelongToModel, 
                    dataItem.GetType().FullName));
            }

            string action = GetActionOrDefaultTo(PageAction.Details); 
            NavigateUrl = table.GetActionPath(action, GetRouteValues(table, dataItem));
 
            if (String.IsNullOrEmpty(Text)) { 
                if (!String.IsNullOrEmpty(DataField)) {
                    Text = DataBinder.GetPropertyValue(dataItem, DataField).ToString(); 
                } else {
                    Text = table.GetDisplayString(dataItem);
                }
            } 
        }
 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")] 
        protected override void OnPreRender(EventArgs e) {
            base.OnPreRender(e); 

            if (DesignMode) {
                if (!String.IsNullOrEmpty(NavigateUrl)) {
                    NavigateUrl = "DesignTimeUrl"; 
                }
                return; 
            } 

            // check both _dataBound and NavigateUrl cause NavigateUrl might be empty if routing/scaffolding 
            // does not allow a particular action
            if (!_dataBound && String.IsNullOrEmpty(NavigateUrl)) {
                MetaTable table;
                try { 
                    table = GetTable();
                } catch (Exception exception) { 
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.DynamicHyperLink_CannotDetermineTable, this.ID), exception); 
                }
 
                if (table == null) {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, DynamicDataResources.DynamicHyperLink_CannotDetermineTable, this.ID));
                }
 
                var action = GetActionOrDefaultTo(PageAction.List);
                NavigateUrl = table.GetActionPath(action, GetRouteValues()); 
            } 
        }
 
        private RouteValueDictionary GetRouteValues() {
            var routeValues = new RouteValueDictionary();
            foreach (var entry in _extraRouteParams) {
                string key = entry.Key; 
                routeValues[key] = entry.Value;
            } 
            return routeValues; 
        }
 
        private RouteValueDictionary GetRouteValues(MetaTable table, object row) {
            RouteValueDictionary routeValues = GetRouteValues();
            foreach (var pk in table.GetPrimaryKeyDictionary(row)) {
                routeValues[pk.Key] = pk.Value; 
            }
            return routeValues; 
        } 

        private string GetActionOrDefaultTo(string defaultAction) { 
            return String.IsNullOrEmpty(Action) ? defaultAction : Action;
        }

        // internal for unit testing 
        internal virtual MetaTable GetTable() {
            MetaTable table; 
            if (!String.IsNullOrEmpty(TableName)) { 
                table = GetTableFromTableName();
            } else { 
                table = DynamicDataRouteHandler.GetRequestMetaTable(Context);
            }
            return table;
        } 

        private MetaTable GetTableFromTableName() { 
            var tableName = TableName; 
            var contextTypeName = ContextTypeName;
            Debug.Assert(!String.IsNullOrEmpty(tableName)); 

            if (!String.IsNullOrEmpty(contextTypeName)) {
                // context type allows to disambiguate table names
                Type contextType = BuildManager.GetType(contextTypeName, /* throwOnError */ true, /* ignoreCase */ true); 
                MetaModel model = MetaModel.GetModel(contextType);
                MetaTable table = model.GetTable(tableName, contextType); 
                return table; 
            } else {
                var table = DynamicDataRouteHandler.GetRequestMetaTable(Context); 
                if (table == null) {
                    return null;
                }
                return table.Model.GetTable(tableName); 
            }
        } 
 
        #region IAttributeAccessor Members
 
        string IAttributeAccessor.GetAttribute(string key) {
            return (string)_extraRouteParams[key];
        }
 
        void IAttributeAccessor.SetAttribute(string key, string value) {
            _extraRouteParams[key] = value; 
        } 

        #endregion 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DynamicHyperLink.cs source code in C# .NET

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