TreeNodeConverter.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 / WinForms / Managed / System / WinForms / TreeNodeConverter.cs / 1 / TreeNodeConverter.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;

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

        /// 
        ///  
        ///    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 TreeNode) {
                TreeNode node = (TreeNode)value;
                MemberInfo info = null;
                object[] args = null; 

                if (node.ImageIndex == -1 || node.SelectedImageIndex == -1) { 
                    if (node.Nodes.Count == 0) { 
                        info = typeof(TreeNode).GetConstructor(new Type[] {typeof(string)});
                        args = new object[] {node.Text}; 
                    }
                    else {
                        info = typeof(TreeNode).GetConstructor(new Type[] {typeof(string), typeof(TreeNode[])});
 
                        TreeNode[] nodesArray = new TreeNode[node.Nodes.Count];
                        node.Nodes.CopyTo(nodesArray, 0); 
 
                        args = new object[] {node.Text, nodesArray};
                    } 
                }
                else {
                    if (node.Nodes.Count == 0) {
                        info = typeof(TreeNode).GetConstructor(new Type[] { 
                            typeof(string),
                            typeof(int), 
                            typeof(int)}); 
                        args = new object[] {
                            node.Text, 
                            node.ImageIndex,
                            node.SelectedImageIndex};
                    }
                    else { 
                        info = typeof(TreeNode).GetConstructor(new Type[] {
                            typeof(string), 
                            typeof(int), 
                            typeof(int),
                            typeof(TreeNode[])}); 

                        TreeNode[] nodesArray = new TreeNode[node.Nodes.Count];
                        node.Nodes.CopyTo(nodesArray, 0);
 
                        args = new object[] {
                            node.Text, 
                            node.ImageIndex, 
                            node.SelectedImageIndex,
                            nodesArray}; 
                    }
                }

                if (info != null) { 
                    return new InstanceDescriptor(info, args, false);
                } 
            } 

            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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