category.cs

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using System;


///<summary>
/// 分类项
/// 表示企业的产品类别，以便于企业组织他们的产品
/// </summary>
public class Category
{
    private string  _id;          
    private bool    _visible;      
    private string  _title;         
    private string  _description;  
    private string  _imageUrl;      
    private string  _imageAltText;  
                
    public Category(string id, bool visible, string title)
    {
        if (String.IsNullOrEmpty(id)) throw new ArgumentException(Messages.CategoryIdUndefined);
        if (String.IsNullOrEmpty(title)) throw new ArgumentException(Messages.CategoryTitleUndefined);            

        _id             = id;
        _visible        = visible;
        _title          = title;
     
    }


    public string Id
    {
        get { return _id; }
    }

    public string Title
    {
        get { return String.IsNullOrEmpty(_title) ? String.Empty : _title; }
        set 
        { 
            if (String.IsNullOrEmpty(value))
                throw new InvalidOperationException(Messages.ItemTitleIsNull);
            _title = value; }
    }

    public bool Visible
    {
        get { return _visible; }
        set { _visible = value; }
    }

    
    public string Description
    {
        get { return String.IsNullOrEmpty(_description) ? String.Empty : _description; }
        set { _description= value; }
    }

    public string ImageUrl
    {
        get { return String.IsNullOrEmpty(_imageUrl) ? String.Empty : _imageUrl; }
        set { _imageUrl= value; }
    }

    public string ImageAltText
    {
        get { return String.IsNullOrEmpty(_imageAltText) ? String.Empty : _imageAltText; }
        set { _imageAltText = value; }
    }
    
} // end class