ColumnHeaderConverter.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 / ColumnHeaderConverter.cs / 1 / ColumnHeaderConverter.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;

    ///  
    /// 
    ///  
    public class ColumnHeaderConverter : 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 ColumnHeader) { 
                ColumnHeader col = (ColumnHeader) value;
                ConstructorInfo ctor; 

                Type t = TypeDescriptor.GetReflectionType(value);
                InstanceDescriptor id = null;
 
                if (col.ImageIndex != -1) {
                    ctor = t.GetConstructor(new Type[]{typeof(int)}); 
                    if (ctor != null) { 
                        id = new InstanceDescriptor(ctor, new object[]{col.ImageIndex}, false);
                    } 

                }

                if (id == null && !String.IsNullOrEmpty(col.ImageKey)) { 
                    ctor = t.GetConstructor(new Type[]{typeof(string)});
                    if (ctor != null) { 
                        id = new InstanceDescriptor(ctor, new object[]{col.ImageKey}, false); 
                    }
                } 

                if (id == null) {
                    ctor = t.GetConstructor(new Type[0]);
                    if (ctor != null) { 
                        return new InstanceDescriptor(ctor, new object[0], false);
                    } 
                    else { 
                        throw new ArgumentException(SR.GetString(SR.NoDefaultConstructor, t.FullName));
                    } 
                }
                return id;
            }
 
            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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