c# - 如何将参数传递给TypeConverter派生类

我想将一些参数传递给从TypeConverter派生的类。请告诉我，我该怎么办？
例如，我有这个课:

public class DDlExample
{
        [TypeConverter(typeof(ExClassConverter))]
        public int Bounds { get; set; }
}

class ExClassConverter : TypeConverter
{
  public int FirstParam{get;set;}
...
}

我想像这样传递值FirstParam:

public class DDlExample
{
        [TypeConverter(typeof(ExClassConverter), ***FirstParam=2***)]
        public int Bounds { get; set; }
}

是否可以？

看来此任务没有解决方案。我将尝试重述该问题。
我有一个从TypeConverter派生的类，并将其应用于不同的属性以显示不同的值下拉列表。如何定义ExClassConverter : TypeConverter中的哪些属性以使用适当的值填充下拉列表？

[AttributeUsage(AttributeTargets.Property,AllowMultiple=true,Inherited=true)]
public class ParamDesc:Attribute
{
    public ParamDesc(int PD) { DictID = PD; }
    public int DictID { get; set; }
}

public class DDlExample
{
    [ParamDesc(1)]
    [TypeConverter(typeof(ExClassConverter))]
    public int Bounds { get; set; }

    [ParamDes(2)]
    [TypeConverter(typeof(ExClassConverter))]
    public int Rounds { get; set; }
}

class ExClassConverter : TypeConverter
{

private List<string> LSValues1 = new List<string>(new string[] {"first","second","third"});
private List<string> LSValues2 = new List<string>(new string[] {"apple","melon","grapes"});

public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
   if (sourceType == typeof(string))
      return true;
    return base.CanConvertFrom(context, sourceType);

}

public override bool CanConvertTo(ITypeDescriptorContext context, Type sourceType)
{
   if (sourceType == typeof(int))
           return (sourceType == typeof(int)?true:false);
    return base.CanConvertTo(context, sourceType);
}

public override object ConvertTo(ITypeDescriptorContext context,
    CultureInfo culture, object value, Type destType)
{
        if (value is int)
        {
            return LSValues1[(int)value];
        }
        return base.ConvertTo(context, culture, value, destType);
}
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
    if (value is string)
    {
        return LSValues1.IndexOf(value.ToString());
    }
    return base.ConvertFrom(context, culture, value);

}

public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
{
    return true;
}

public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
{
    return true;
}

public override TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
    StandardValuesCollection svc = new StandardValuesCollection(LSValues1);
    return svc;
}
}

最佳答案

我已经解决了任务。我在方法ConvertTo和ConvertFrom上使用了ITypeDescriptorContext context:

if (context != null)
{
    AttributeCollection ua = context.PropertyDescriptor.Attributes;
    ParamDesc cca = (ParamDesc)ua[typeof(ParamDesc)];
    if (cca != null)
        System.Console.WriteLine("Attribute value is " + cca.DictID.ToString());
}