BaseDataListPage.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / WebControls / ListControls / BaseDataListPage.cs / 1 / BaseDataListPage.cs
                        

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

namespace System.Web.UI.Design.WebControls.ListControls { 
 
    using System.Design;
    using System; 
    using System.CodeDom;
    using System.Collections;
    using System.ComponentModel;
    using System.ComponentModel.Design; 
    using System.Diagnostics;
    using System.Data; 
    using System.Drawing; 
    using System.Web.UI.WebControls;
    using System.Windows.Forms; 
    using System.Windows.Forms.Design;

    /// 
    ///  
    ///   The base class for all DataGrid and DataList component editor pages.
    ///  
    ///  
    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
    internal abstract class BaseDataListPage : ComponentEditorPage { 

        private bool dataGridMode;

        protected abstract string HelpKeyword { 
            get;
        } 
 
        protected bool IsDataGridMode {
            get { 
                return dataGridMode;
            }
        }
 
        protected BaseDataList GetBaseControl() {
            IComponent selectedComponent = GetSelectedComponent(); 
 
            Debug.Assert(selectedComponent is BaseDataList,
                         "Unexpected component type for BaseDataListPage: " + selectedComponent.GetType().FullName); 
            return (BaseDataList)selectedComponent;
        }

        protected BaseDataListDesigner GetBaseDesigner() { 
            BaseDataListDesigner controlDesigner = null;
 
            IComponent selectedComponent = GetSelectedComponent(); 

            ISite componentSite = selectedComponent.Site; 
            Debug.Assert(componentSite != null, "Expected the component to be sited.");

            IDesignerHost designerHost = (IDesignerHost)componentSite.GetService(typeof(IDesignerHost));
            Debug.Assert(designerHost != null, "Expected a designer host."); 

            if (designerHost != null) { 
                object designer = designerHost.GetDesigner(selectedComponent); 

                Debug.Assert(designer != null, "Expected a designer for the selected component"); 
                Debug.Assert(designer is BaseDataListDesigner, "Expected a designer that derives from BaseDataListDesigner");
                controlDesigner = (BaseDataListDesigner)designer;
            }
 
            return controlDesigner;
        } 
 
        /// 
        ///  
        ///   Sets the component that is to be edited in the page.
        /// 
        public override void SetComponent(IComponent component) {
            base.SetComponent(component); 
            dataGridMode = (GetBaseControl() is System.Web.UI.WebControls.DataGrid);
 
            string rtlText = SR.GetString(SR.RTL); 
            if (!String.Equals(rtlText, "RTL_False", StringComparison.Ordinal)) {
                RightToLeft = RightToLeft.Yes; 
            }
        }

        ///  
        public override void ShowHelp() {
            IComponent selectedComponent = GetSelectedComponent(); 
 
            ISite componentSite = selectedComponent.Site;
            Debug.Assert(componentSite != null, "Expected the component to be sited."); 

            IHelpService helpService = (IHelpService)componentSite.GetService(typeof(IHelpService));
            if (helpService != null) {
                helpService.ShowHelpFromKeyword(HelpKeyword); 
            }
        } 
 
        /// 
        public override bool SupportsHelp() { 
            return true;
        }

 
        /// 
        ///  
        ///   This contains information about a datasource and is used to populate 
        ///   the datasource combo. This is used in the General page for a DataList
        ///   and the Data page for a DataGrid. 
        /// 
        protected class DataSourceItem {
            private IEnumerable runtimeDataSource;
            private string dataSourceName; 
            private PropertyDescriptorCollection dataFields;
 
            public DataSourceItem(string dataSourceName, IEnumerable runtimeDataSource) { 
                Debug.Assert(dataSourceName != null, "invalid name for datasource");
 
                this.runtimeDataSource = runtimeDataSource;
                this.dataSourceName = dataSourceName;
            }
 
            public PropertyDescriptorCollection Fields {
                get { 
                    if (dataFields == null) { 
                        IEnumerable ds = RuntimeDataSource;
                        if (ds != null) { 
                            dataFields = DesignTimeData.GetDataFields(ds);
                        }
                    }
                    if (dataFields == null) { 
                        dataFields = new PropertyDescriptorCollection(null);
                    } 
                    return dataFields; 
                }
            } 

            public virtual bool HasDataMembers {
                get {
                    return false; 
                }
            } 
 
            public string Name {
                get { 
                    return dataSourceName;
                }
            }
 
            protected virtual object RuntimeComponent {
                get { 
                    return runtimeDataSource; 
                }
            } 

            protected virtual IEnumerable RuntimeDataSource {
                get {
                    return runtimeDataSource; 
                }
            } 
 
            protected void ClearFields() {
                dataFields = null; 
            }

            public override string ToString() {
                return this.Name; 
            }
        } 
 
        /// 
        ///  
        /// 
        protected class ListSourceDataSourceItem : DataSourceItem {

            private IListSource runtimeListSource; 
            private string currentDataMember;
 
            public ListSourceDataSourceItem(string dataSourceName, IListSource runtimeListSource) : 
                base(dataSourceName, null) {
                Debug.Assert(runtimeListSource != null); 
                this.runtimeListSource = runtimeListSource;
            }

            public string CurrentDataMember { 
                get {
                    return currentDataMember; 
                } 
                set {
                    currentDataMember = value; 
                    ClearFields();
                }
            }
 
            public override bool HasDataMembers {
                get { 
                    return runtimeListSource.ContainsListCollection; 
                }
            } 

            protected override object RuntimeComponent {
                get {
                    return runtimeListSource; 
                }
            } 
 
            protected override IEnumerable RuntimeDataSource {
                get { 
                    if (HasDataMembers) {
                        return DesignTimeData.GetDataMember(runtimeListSource, currentDataMember);
                    }
                    else { 
                        return (IEnumerable)runtimeListSource.GetList();
                    } 
                } 
            }
        } 
    }
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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