ef core 保存 修改

新增、批量新增

using (var db = new BlogDbContext())
{
for (int i = 0; i < 1000000; i++)
{
var blog = new Blog { Url = "url" + i.ToString() };
db.Blogs.Add(blog);
}
await db.SaveChanges();
}

新增一条  去掉循环 实例化单个对象 进行SaveChanges()
 -------------------------------------------------------------------------------------------

删除、批量删除

var blog = context.Blogs.Find(1);

context.Blogs.Remove(blog);

context.SaveChanges();

 -------------------------------------------------------------------------------------------

var blog = new Blog { BlogId = 4 };

context.Remove(blog);

context.SaveChanges();

 -------------------------------------------------------------------------------------------

var blog = new Blog { BlogId = 3 };

context.Entry(blog).State = EntityState.Deleted;

context.SaveChanges();

 -------------------------------------------------------------------------------------------

 

using (var db = new BlogDbContext())
{

var allblogs = myDbContext.EnterpriseManagements.ToListAsync();
myDbContext.EnterpriseManagements.RemoveRange(allblogs.Result);
myDbContext.SaveChanges();

}

 

原文链接：https://blog.csdn.net/xingkongtianyuzhao/article/details/102905185