protected override bool ProcessDialogKey(Keys keyData)
{
if (keyData == Keys.Escape)
{
m_old_hobbies = m_new_hobbies;
canceling = true;
}
return(base.ProcessDialogKey(keyData));
}
/// <summary>
/// 使用指定的上下文和区域性信息将给定值对象转换为指定的类型。
/// </summary>
/// <param name="context">一个 System.ComponentModel.ITypeDescriptorContext，用于提供格式上下文。</param>
/// <param name="culture">System.Globalization.CultureInfo。 如果传递 null，则采用当前区域性。</param>
/// <param name="value">要转换的 System.Object。</param>
/// <param name="destinationType">System.Type 转换 value 参数</param>
/// <returns>一个 System.Object，它表示转换后的值。</returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
StringBuilder sb = new StringBuilder();
if (value == null)
{
return("");
}
if (destinationType == typeof(string))
{
Hobbies hobbies = value as Hobbies;
if (hobbies.Music)
{
sb.Append("Music,");
}
if (hobbies.Game)
{
sb.Append("Game,");
}
if (hobbies.Running)
{
sb.Append("Running,");
}
if (hobbies.Film)
{
sb.Append("Film,");
}
if (hobbies.Basketball)
{
sb.Append("Basketball,");
}
if (sb.Length > 0)
{
return(sb.ToString().Substring(0, sb.ToString().Length - 1));
}
else
{
return("");
}
}
if (destinationType == typeof(InstanceDescriptor) && value != null)
{
ConstructorInfo constructorInfo = typeof(Hobbies).GetConstructor(new Type[] {});
Hobbies point = value as Hobbies;
return(new InstanceDescriptor(constructorInfo, new object[] { }));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string)
{
Hobbies hobbies = new Hobbies();
string[] par = value.ToString().Split(',');
if (par.Length == 0)
{
throw new NotSupportedException("输入非法");
}
foreach (var item in par)
{
switch (item)
{
case "Music":
hobbies.Music = true;
break;
case "Game":
hobbies.Game = true;
break;
case "Running":
hobbies.Running = true;
break;
case "Film":
hobbies.Film = true;
break;
case "Basketball":
hobbies.Basketball = true;
break;
default:
break;
}
}
return(hobbies);
}
return(base.ConvertFrom(context, culture, value));
}
public HobbiesCtrl(Hobbies hobbies)
{
InitializeComponent();
m_old_hobbies = hobbies;
m_new_hobbies = hobbies;
}