DesignTimeData.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / DesignTimeData.cs / 1 / DesignTimeData.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design { 
 
    using System;
    using System.Design; 
    using System.Collections;
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using Microsoft.Win32; 
    using System.Data;
    using System.Diagnostics; 
    using System.Globalization; 
    using System.Reflection;
    using System.Web.UI; 

    /// 
    /// 
    ///  Helpers used by control designers to generate sample data 
    ///  for use in design time databinding.
    ///  
    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] 
    public sealed class DesignTimeData {
 
        /// 
        /// 
        public static readonly EventHandler DataBindingHandler = new EventHandler(GlobalDataBindingHandler.OnDataBind);
 
        /// 
        ///  
        ///  
        private DesignTimeData() {
        } 

        /// 
        /// 
        ///  Creates a dummy datatable. 
        /// 
        public static DataTable CreateDummyDataTable() { 
            DataTable dummyDataTable = new DataTable(); 
            dummyDataTable.Locale = CultureInfo.InvariantCulture;
 
            DataColumnCollection columns = dummyDataTable.Columns;
            columns.Add(SR.GetString(SR.Sample_Column, 0), typeof(string));
            columns.Add(SR.GetString(SR.Sample_Column, 1), typeof(string));
            columns.Add(SR.GetString(SR.Sample_Column, 2), typeof(string)); 

            return dummyDataTable; 
        } 

        ///  
        ///  Creates a dummy datatable that indicates that the databound control is connected to a datasource.
        /// 
        public static DataTable CreateDummyDataBoundDataTable() {
            DataTable dummyDataTable = new DataTable(); 
            dummyDataTable.Locale = CultureInfo.InvariantCulture;
 
            DataColumnCollection columns = dummyDataTable.Columns; 
            columns.Add(SR.GetString(SR.Sample_Databound_Column, 0), typeof(string));
            columns.Add(SR.GetString(SR.Sample_Databound_Column, 1), typeof(int)); 
            columns.Add(SR.GetString(SR.Sample_Databound_Column, 2), typeof(string));

            return dummyDataTable;
        } 

        ///  
        ///  
        ///   Creates a sample datatable with same schema as the supplied datasource.
        ///  
        public static DataTable CreateSampleDataTable(IEnumerable referenceData) {
            return CreateSampleDataTableInternal(referenceData, false);
        }
 
        public static DataTable CreateSampleDataTable(IEnumerable referenceData, bool useDataBoundData) {
            return CreateSampleDataTableInternal(referenceData, useDataBoundData); 
        } 

        private static DataTable CreateSampleDataTableInternal(IEnumerable referenceData, bool useDataBoundData) { 
            DataTable sampleDataTable = new DataTable();
            sampleDataTable.Locale = CultureInfo.InvariantCulture;
            DataColumnCollection columns = sampleDataTable.Columns;
 
            PropertyDescriptorCollection props = GetDataFields(referenceData);
            if (props != null) { 
                foreach (PropertyDescriptor propDesc in props) { 
                    Type propType = propDesc.PropertyType;
 
                    if ((propType.IsPrimitive == false) &&
                        (propType != typeof(DateTime)) &&
                        (propType != typeof(Decimal))) {
                        // we can't handle any remaining or custom types, so 
                        // we'll have to create a column of type string in the
                        // design time table. 
 
                        //
                        propType = typeof(string); 
                    }

                    columns.Add(propDesc.Name, propType);
                } 
            }
 
            if (columns.Count != 0) { 
                return sampleDataTable;
            } 
            else {
                if (useDataBoundData) {
                    return CreateDummyDataBoundDataTable();
                } 
                return CreateDummyDataTable();
            } 
        } 

        ///  
        /// 
        /// 
        public static PropertyDescriptorCollection GetDataFields(IEnumerable dataSource) {
            if (dataSource is ITypedList) { 
                return ((ITypedList)dataSource).GetItemProperties(new PropertyDescriptor[0]);
            } 
 
            Type dataSourceType = dataSource.GetType();
            PropertyInfo itemProp = dataSourceType.GetProperty("Item", BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static, null, null, new Type[] { typeof(int) }, null); 

            if ((itemProp != null) && (itemProp.PropertyType != typeof(object))) {
                return TypeDescriptor.GetProperties(itemProp.PropertyType);
            } 

            return null; 
        } 

        ///  
        /// 
        /// 
        public static string[] GetDataMembers(object dataSource) {
            IListSource listSource = dataSource as IListSource; 

            if ((listSource != null) && listSource.ContainsListCollection) { 
                IList memberList = ((IListSource)dataSource).GetList(); 
                Debug.Assert(memberList != null, "Got back null from IListSource");
 
                ITypedList typedList = memberList as ITypedList;
                if (typedList != null) {
                    PropertyDescriptorCollection props = typedList.GetItemProperties(new PropertyDescriptor[0]);
 
                    if (props != null) {
                        ArrayList members = new ArrayList(props.Count); 
 
                        foreach (PropertyDescriptor pd in props) {
                            members.Add(pd.Name); 
                        }

                        return (string[])members.ToArray(typeof(string));
                    } 
                }
            } 
 
            return null;
        } 

        /// 
        /// 
        ///  
        public static IEnumerable GetDataMember(IListSource dataSource, string dataMember) {
            IEnumerable list = null; 
 
            IList memberList = dataSource.GetList();
 
            if ((memberList != null) && (memberList is ITypedList)) {
                if (dataSource.ContainsListCollection == false) {
                    Debug.Assert((dataMember == null) || (dataMember.Length == 0), "List does not contain data members");
                    if ((dataMember != null) && (dataMember.Length != 0)) { 
                        throw new ArgumentException(SR.GetString(SR.DesignTimeData_BadDataMember));
                    } 
                    list = (IEnumerable)memberList; 
                }
                else { 
                    ITypedList typedMemberList = (ITypedList)memberList;

                    PropertyDescriptorCollection propDescs = typedMemberList.GetItemProperties(new PropertyDescriptor[0]);
                    if ((propDescs != null) && (propDescs.Count != 0)) { 
                        PropertyDescriptor listProperty = null;
 
                        if ((dataMember == null) || (dataMember.Length == 0)) { 
                            listProperty = propDescs[0];
                        } 
                        else {
                            listProperty = propDescs.Find(dataMember, true);
                        }
 
                        if (listProperty != null) {
                            object listRow = memberList[0]; 
                            object listObject = listProperty.GetValue(listRow); 

                            if ((listObject != null) && (listObject is IEnumerable)) { 
                                list = (IEnumerable)listObject;
                            }
                        }
                    } 
                }
            } 
 
            return list;
        } 

        /// 
        /// 
        ///   Adds sample rows into the specified datatable, and returns a cursor on top of it. 
        /// 
        public static IEnumerable GetDesignTimeDataSource(DataTable dataTable, int minimumRows) { 
            DataView dv = null; 

            int rowCount = dataTable.Rows.Count; 
            if (rowCount < minimumRows) {
                int rowsToAdd = minimumRows - rowCount;

                DataRowCollection rows = dataTable.Rows; 
                DataColumnCollection columns = dataTable.Columns;
                int columnCount = columns.Count; 
                DataRow[] rowsArray = new DataRow[rowsToAdd]; 

                // add the sample rows 
                for (int i = 0; i < rowsToAdd; i++) {
                    DataRow row = dataTable.NewRow();
                    int rowIndex = rowCount + i;
 
                    for (int c = 0; c < columnCount; c++) {
                        Type dataType = columns[c].DataType; 
                        Object obj = null; 

                        if (dataType == typeof(String)) { 
                            obj = SR.GetString(SR.Sample_Databound_Text_Alt);
                        }
                        else if ((dataType == typeof(Int32)) ||
                                 (dataType == typeof(Int16)) || 
                                 (dataType == typeof(Int64)) ||
                                 (dataType == typeof(UInt32)) || 
                                 (dataType == typeof(UInt16)) || 
                                 (dataType == typeof(UInt64))) {
                            obj = rowIndex; 
                        }
                        else if ((dataType == typeof(Byte)) ||
                                 (dataType == typeof(SByte))) {
                            obj = (rowIndex % 2) != 0 ? 1 : 0; 
                        }
                        else if (dataType == typeof(Boolean)) { 
                            obj = (rowIndex % 2) != 0 ? true : false; 
                        }
                        else if (dataType == typeof(DateTime)) { 
                            obj = DateTime.Today;
                        }
                        else if ((dataType == typeof(Double)) ||
                                 (dataType == typeof(Single)) || 
                                 (dataType == typeof(Decimal))) {
                            obj = i / 10.0; 
                        } 
                        else if (dataType == typeof(Char)) {
                            obj = 'x'; 
                        }
                        else {
                            Debug.Assert(false, "Unexpected type of column in design time datatable.");
                            obj = System.DBNull.Value; 
                        }
 
                        row[c] = obj; 
                    }
 
                    rows.Add(row);
                }
            }
 
            // create a DataView on top of the effective design time datasource
            dv = new DataView(dataTable); 
            return dv; 
        }
 
        /// 
        /// 
        /// 
        public static object GetSelectedDataSource(IComponent component, string dataSource) { 
            object selectedDataSource = null;
 
            ISite componentSite = component.Site; 
            if (componentSite != null) {
                IContainer container = (IContainer)componentSite.GetService(typeof(IContainer)); 

                if (container != null) {
                    IComponent comp = container.Components[dataSource];
                    if ((comp is IEnumerable) || (comp is IListSource)) { 
                        selectedDataSource = comp;
                    } 
                } 
            }
 
            return selectedDataSource;
        }

        ///  
        /// 
        ///  
        public static IEnumerable GetSelectedDataSource(IComponent component, string dataSource, string dataMember) { 
            IEnumerable selectedDataSource = null;
 
            object selectedDataSourceObject = DesignTimeData.GetSelectedDataSource(component, dataSource);
            if (selectedDataSourceObject != null) {
                IListSource listSource = selectedDataSourceObject as IListSource;
                if (listSource != null) { 
                    if (listSource.ContainsListCollection == false) {
                        // the returned list is itself the list we want to bind to 
                        selectedDataSource = (IEnumerable)listSource.GetList(); 
                    }
                    else { 
                        selectedDataSource = GetDataMember(listSource, dataMember);
                    }
                }
                else { 
                    Debug.Assert(selectedDataSourceObject is IEnumerable);
                    selectedDataSource = (IEnumerable)selectedDataSourceObject; 
                } 
            }
 
            return selectedDataSource;
        }
    }
} 


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

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