c# - 如何为 DbPropertyEntry 传递值？

Question

我在我的通用存储库中创建了一个通用方法 AvoidPropertyModify(T entity, Expression< Func< T, DbPropertyEntry>> properties) 来限制实体特定属性的更新。现在，我如何通过给定的确切参数调用我的方法。

public virtual void AvoidPropertyModify(T entity, Expression<Func<T,DbPropertyEntry>> properties)
{
     Entities.Entry(entity).Property(properties).IsModified =false;
}

//Calling 

public JsonResult Update(ChartOfAccounts coa)
{
     AvoidPropertyModify(coa, x =>  new {x.Code,x.Name });  // Giving syntax Error
}

Answer 1

使用 Expression<Func<TEntity, TProperty>>表达式:

public virtual void AvoidPropertyModify<TEntity, TProperty>(
    TEntity entity, 
    Expression<Func<TEntity, TProperty>> getProperty)
    where TEntity : class
{
    var entityEntry = Context.Entry(entity);
    var propertyEntry = entityEntry.Property(getProperty);
    propertyEntry.IsModified = false;
}

public void Update(Customer customer)
{
    AvoidPropertyModify(customer, x => x.Number); 
}

获取propertyEntry的另一种选择就是传递属性名:

var propertyEntry = entityEntry.Property("Number");