/// <summary>
/// 自动处理附件, 处理对象为包含附件外键的数据模型, 比如, 处理客户沟通的附件, 则参数对象 obj 应为 CustomerCommunicateAttachment 类型对象
/// </summary>
/// <param name="ctx">上下文</param>
/// <param name="obj">类型实例</param>
public static void AddNewAttachmentData(this DbContext ctx, object obj)
{
var type = obj.GetType();
var foreignKey = type.GetForeignKey(WebConfig.AttachmentEntitySetType);
if (foreignKey.IsNotNullOrEmpty())
{
var property = type.GetProperty(foreignKey);
if (property != null)
{
var value = property.GetValue(obj);
if ((value as IEntitySet).IsNullOrEmpty())
{
var fileName = obj.GetPropertyValue(nameof(EntitySetWithAttachment.FileName));
if (fileName != null)
{
var att = WebConfig.GetAttachmentFromSession(fileName.ToString());
if (att != null)
{
ctx.Save(att);
property.SetValue(obj, (att as IEntitySet).Id);
}
}
}
}
}
}