ListItemConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ListItemConverter.cs / 1 / ListItemConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms {
    using System.Runtime.Serialization.Formatters; 
    using System.Runtime.Remoting;
    using System.Runtime.InteropServices;

    using Microsoft.Win32; 
    using System.Collections;
    using System.ComponentModel; 
    using System.ComponentModel.Design.Serialization; 
    using System.Drawing;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Reflection;

    ///  
    /// 
    ///      ListViewItemConverter is a class that can be used to convert 
    ///      ListViewItem objects from one data type to another.  Access this 
    ///      class through the TypeDescriptor.
    ///  
    public class ListViewItemConverter : ExpandableObjectConverter {

        /// 
        ///  
        ///    Gets a value indicating whether this converter can
        ///       convert an object to the given destination type using the context. 
        ///  
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
            if (destinationType == typeof(InstanceDescriptor)) { 
                return true;
            }
            return base.CanConvertTo(context, destinationType);
        } 

        ///  
        ///  
        ///      Converts the given object to another type.  The most common types to convert
        ///      are to and from a string object.  The default implementation will make a call 
        ///      to ToString on the object if the object is valid and if the destination
        ///      type is string.  If this cannot convert to the desitnation type, this will
        ///      throw a NotSupportedException.
        ///  
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
            if (destinationType == null) { 
                throw new ArgumentNullException("destinationType"); 
            }
 
            if (destinationType == typeof(InstanceDescriptor) && value is ListViewItem) {
                ListViewItem item = (ListViewItem)value;
                ConstructorInfo ctor;
 
                // Should we use the subitem constructor?
                // 
                for(int i=1; i < item.SubItems.Count; ++i) { 
                    if (item.SubItems[i].CustomStyle) {
                        if (!String.IsNullOrEmpty(item.ImageKey)) { 
                            ctor = typeof(ListViewItem).GetConstructor(new Type[] { typeof(ListViewItem.ListViewSubItem[]), typeof(string)});
                            if (ctor != null) {
                                ListViewItem.ListViewSubItem[] subItemArray = new ListViewItem.ListViewSubItem[item.SubItems.Count];
                                ((ICollection)item.SubItems).CopyTo(subItemArray, 0); 
                                return new InstanceDescriptor(ctor, new object[] {subItemArray, item.ImageKey}, false);
                            } 
                            else { 
                                break;
                            } 
                        } else {
                            ctor = typeof(ListViewItem).GetConstructor(new Type[] { typeof(ListViewItem.ListViewSubItem[]), typeof(int)});
                            if (ctor != null) {
                                ListViewItem.ListViewSubItem[] subItemArray = new ListViewItem.ListViewSubItem[item.SubItems.Count]; 
                                ((ICollection)item.SubItems).CopyTo(subItemArray, 0);
                                return new InstanceDescriptor(ctor, new object[] {subItemArray, item.ImageIndex}, false); 
                            } 
                            else {
                                break; 
                            }
                        }
                    }
                } 

                // Convert SubItem array to string array 
                // 
                string[] subItems = new string[item.SubItems.Count];
                for(int i=0; i < subItems.Length; ++i) { 
                    subItems[i] = item.SubItems[i].Text;
                }

                // ForeColor, BackColor or ItemFont set 
                //
                if (item.SubItems[0].CustomStyle) { 
                    if (!String.IsNullOrEmpty(item.ImageKey)) { 
                        ctor = typeof(ListViewItem).GetConstructor(new Type[] {
                            typeof(string[]), 
                            typeof(string),
                            typeof(Color),
                            typeof(Color),
                            typeof(Font)}); 
                        if (ctor != null) {
                            return new InstanceDescriptor(ctor, new object[] { 
                                subItems, 
                                item.ImageKey,
                                item.SubItems[0].CustomForeColor ? item.ForeColor : Color.Empty, 
                                item.SubItems[0].CustomBackColor ? item.BackColor : Color.Empty,
                                item.SubItems[0].CustomFont ? item.Font : null
                                }, false);
                        } 
                    } else {
                        ctor = typeof(ListViewItem).GetConstructor(new Type[] { 
                            typeof(string[]), 
                            typeof(int),
                            typeof(Color), 
                            typeof(Color),
                            typeof(Font)});
                        if (ctor != null) {
                            return new InstanceDescriptor(ctor, new object[] { 
                                subItems,
                                item.ImageIndex, 
                                item.SubItems[0].CustomForeColor ? item.ForeColor : Color.Empty, 
                                item.SubItems[0].CustomBackColor ? item.BackColor : Color.Empty,
                                item.SubItems[0].CustomFont ? item.Font : null 
                                }, false);
                        }
                    }
                } 

                // Text 
                // 
                if (item.ImageIndex == -1 && String.IsNullOrEmpty(item.ImageKey) && item.SubItems.Count <= 1) {
                    ctor = typeof(ListViewItem).GetConstructor(new Type[] {typeof(string)}); 
                    if (ctor != null) {
                        return new InstanceDescriptor(ctor, new object[] {item.Text}, false);
                    }
                } 

                // Text and Image 
                // 
                if (item.SubItems.Count <= 1) {
                    if (!String.IsNullOrEmpty(item.ImageKey)) { 
                        ctor = typeof(ListViewItem).GetConstructor(new Type[] {
                            typeof(string),
                            typeof(string)});
                        if (ctor != null) { 
                            return new InstanceDescriptor(ctor, new object[] {item.Text, item.ImageKey}, false);
                        } 
                    } else { 
                        ctor = typeof(ListViewItem).GetConstructor(new Type[] {
                            typeof(string), 
                            typeof(int)});
                        if (ctor != null) {
                            return new InstanceDescriptor(ctor, new object[] {item.Text, item.ImageIndex}, false);
                        } 
                    }
                } 
 
                // Text, Image and SubItems
                // 
                if (!String.IsNullOrEmpty(item.ImageKey)) {
                    ctor = typeof(ListViewItem).GetConstructor(new Type[] {
                        typeof(string[]),
                        typeof(string)}); 
                    if (ctor != null) {
                        return new InstanceDescriptor(ctor, new object[] {subItems, item.ImageKey}, false); 
                    } 
                } else {
                    ctor = typeof(ListViewItem).GetConstructor(new Type[] { 
                        typeof(string[]),
                        typeof(int)});
                    if (ctor != null) {
                        return new InstanceDescriptor(ctor, new object[] {subItems, item.ImageIndex}, false); 
                    }
                } 
            } 

            return base.ConvertTo(context, culture, value, destinationType); 
        }
    }

    internal class ListViewSubItemConverter : ExpandableObjectConverter { 

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { 
            if (destinationType == typeof(InstanceDescriptor)) { 
                return true;
            } 
            return base.CanConvertTo(context, destinationType);
        }

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType == null) {
                throw new ArgumentNullException("destinationType"); 
            } 

            if (destinationType == typeof(InstanceDescriptor) && value is ListViewItem.ListViewSubItem) { 
                ListViewItem.ListViewSubItem item = (ListViewItem.ListViewSubItem)value;
                ConstructorInfo ctor;

                // Subitem has custom style 
                //
                if (item.CustomStyle) { 
                    ctor = typeof(ListViewItem.ListViewSubItem).GetConstructor(new Type[] { 
                        typeof(ListViewItem),
                        typeof(string), 
                        typeof(Color),
                        typeof(Color),
                        typeof(Font)});
                    if (ctor != null) { 
                        return new InstanceDescriptor(ctor, new object[] {
                            null, 
                            item.Text, 
                            item.ForeColor,
                            item.BackColor, 
                            item.Font}, true);
                    }
                }
 
                // Otherwise, just use the text constructor
                // 
                ctor = typeof(ListViewItem.ListViewSubItem).GetConstructor(new Type[] {typeof(ListViewItem), typeof(string)}); 
                if (ctor != null) {
                    return new InstanceDescriptor(ctor, new object[] {null, item.Text}, true); 
                }
            }

            return base.ConvertTo(context, culture, value, destinationType); 
        }
    } 
} 


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

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