Question

我收到以下代码的PropertyAccessException：

public class Category
{
    public int? categoryId { get; set; }
    public string categoryName { get; set; }
}

public class Stock
{
    public int? stockId { get; set; }
    public string stockCode { get; set; }
    public string stockName { get; set; }
    public IList<Category> PublicCategory { get; set; }
    public IList<Category> PrivateCategory { get; set; }

    public IList<StockCategory> PublicCategoryList
    {
        get
        {
            IList<StockCategory> list = new List<StockCategory>();

            if (PublicCategory != null)
            {
                foreach (Category c in PublicCategory)
                {
                    StockCategory sc = new StockCategory() { Category = c, Stock = this, Type = 0 };
                    list.Add(sc);
                }
            }

            return list;
        }
        set
        {
            PublicCategory = new List<Category>();

            foreach (StockCategory sc in value)
            {
                PublicCategory.Add(sc.Category);
            }
        }
    }

    public IList<StockCategory> PrivateCategoryList
    {
        get
        {
            IList<StockCategory> list = new List<StockCategory>();

            if (PrivateCategory != null)
            {
                foreach (Category c in PrivateCategory)
                {
                    StockCategory sc = new StockCategory() { Category = c, Stock = this, Type = 1 };
                    list.Add(sc);
                }
            }

            return list;
        }
        set
        {
            PrivateCategory = new List<Category>();

            foreach (StockCategory sc in value)
            {
                PrivateCategory.Add(sc.Category);
            }
        }
    }
}

public class StockCategory
{
    public Stock Stock {get; set;}
    public Category Category { get; set; }
    public int Type { get; set; }

    public override bool Equals(object obj)
    {
        if (obj == null)
            return false;
        var t = obj as StockCategory;
        if (t == null)
            return false;
        if (Stock.stockId == t.Stock.stockId && Category.categoryId == t.Category.categoryId)
            return true;
        return false;
    }
    public override int GetHashCode()
    {
        return base.GetHashCode();
    } 
}

以下是映射：

<bag name="PublicCategoryList" table="Stock_Category" cascade="all" lazy="false" where="TYPE=0">
  <key column="STOCK_ID"/>
  <one-to-many class="Category"/>
</bag>

<bag name="PrivateCategoryList" table="Stock_Category" cascade="all" lazy="false" where="TYPE=1">
  <key column="STOCK_ID"/>
  <one-to-many class="Category" />
</bag>

我无法直接将其映射为多对多，因为在插入映射表时我必须设置一个额外的字段。上述解决方案是解决无法设置其他列的多对多限制。但是，当我执行session.Save（stockObject）时，上面的解决方案给出了一个例外。如下：

            NHibernateDAO<Stock, int> par = CreateDAO<Stock, int>();

            Stock p = new Stock();
            p.stockName = "stock";
            p.stockCode = "stockcode";
            p.PublicCategory = new List<Category>();
            p.PrivateCategory = new List<Category>();


            Category cd1 = new Category() { categoryName = "category1" };
            Category cd2 = new Category() { categoryName = "category2" };
            Category cd3 = new Category() { categoryName = "category3" };

            p.PublicCategory.Add(cd1);
            p.PublicCategory.Add(cd2);
            p.PublicCategory.Add(cd3);

            Category cd4 = new Category() { categoryName = "category4" };
            Category cd5 = new Category() { categoryName = "category5" };
            Category cd6 = new Category() { categoryName = "category6" };

            p.PrivateCategory.Add(cd4);
            p.PrivateCategory.Add(cd5);
            p.PrivateCategory.Add(cd6);

            par.Add(p);
            Stock p1 = par.GetById(1);

例外情况如下：

“NHibernate.PropertyAccessException：Exception发生了TestSolution.Domain.Category.categoryId的getter ---＆gt; System.Reflection.TargetException：Object与目标类型不匹配。\ r \ n在System.Reflection.RuntimeMethodInfo.CheckConsistency（对象目标）\ r \ n在System.Reflection.RuntimeMethodInfo.Invoke（Object obj，BindingFlags invokeAttr，Binder binder，Object []参数，CultureInfo culture，Boolean skipVisibilityChecks）\ r \ n在System.Reflection.RuntimeMethodInfo.Invoke（Object obj，BindingFlags invokeAttr，Binder binder，Object []参数，CultureInfo文化）\ r \ n在System.Reflection.RuntimePropertyInfo.GetValue（Object obj，BindingFlags invokeAttr，Binder binder，Object [] index，CultureInfo culture）\ r \ n at System.Reflection.RuntimePropertyInfo.GetValue（Object obj，Object [] index）\ r \ n，位于d：\ CSharp \ NH \ NH \ nhibernate \ src \ NHibernate中的NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get（Object target） \ Properties \ BasicPropertyAccessor.cs：207行\ r \ n --- E.内部异常的内容在HibernateTest.Program.Main的C：\ Arnab \ otherProjects \ POC Mapping \ HibernateTest \ NHibernateDAO.cs：第43行\ r \ n中的HibernateTest.NHibernateDAO`2.Add（TItem项目）中追踪--- \ r \ n （String [] args）在C：\ Arnab \ otherProjects \ POC Mapping \ HibernateTest \ Program.cs：第46行“

PropertyAccessException“映射一对多映射时出现异常”

0 个答案: