Question

我尝试在模型更改上备份数据，并在创建数据库后重新创建它。它工作正常，但我需要为每个班级写这个。如何在DbContext中获取所有DbSet并使用此函数循环？

备份

XmlSerializer classSerializer = new XmlSerializer(typeof(List<TextComponent>));
StreamWriter classComponentWriter = new StreamWriter(Server.MapPath("~/App_Data/backup/TextComponents.xml"));
classSerializer.Serialize(classComponentWriter, _db.TextComponents.ToList());
classComponentWriter.Close();

恢复

List<TextComponent> TextComponents = null;
XmlSerializer TextComponentSerializer = new XmlSerializer(typeof(List<TextComponent>));
FileStream TextComponentFileStream = new FileStream(Server.MapPath("~/App_Data/backup//TextComponents.xml"), FileMode.Open);
TextComponents = (List<TextComponent>)TextComponentSerializer.Deserialize(TextComponentFileStream);

foreach (TextComponent item in TextComponents)
{
_db.TextComponents.Add(item);
}
_db.SaveChanges();

Answer 1

您可以使用反射来枚举所有DBSet属性：

properties = typeof(DBContext).GetProperties(); // or this.GetType().GetProperties();

foreach (PropertyInfo property in properties)  
{  
    if (/*Check if property type is DBSet by comparing [property.DeclaringType](http://msdn.microsoft.com/en-us/library/system.type.declaringtype.aspx)*/)  
        // Write backup or restore code here.  
}

`

实体框架代码优先 - 备份和恢复DbContext

1 个答案: