#眉標=Software Product Line Engineering
#副標=軟體產品線工程在微軟開發平台的實踐（4）
#大標= Domain-Specific Language Tools進階應用
#作者=文／圖	歐宣修
#引言=


==程式1	<box>===========
namespace Dands.DLF1
{
	/// <summary>
	/// DomainClass Field
	/// Description for Dands.DLF1.Field
	/// </summary>
	略…
	public partial class Field : DslModeling::
ModelElement { 略… }
}
==<end>==============



==程式2	<box>===========
namespace Dands.DLF1
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Collections.Specialized;
    using Microsoft.VisualStudio.Modeling.Validation;


    [ValidationState(ValidationState.Enabled)]
    //…………(1)
    public partial class Field
    {
        [ValidationMethod
         (
             ValidationCategories.Save | 
ValidationCategories.Menu             
         )
        ] //…………(2)
        private void ValidateFromTo(
ValidationContext context)
        {
            if (this.From > this.To)
            { //…………(3)
                context.LogError("From must be 
less than or equals than To", "FromToError", this);
            }
        }
    }
}
==<end>==============