C# 实体框架：使用 Where 和 Join 进行批量更新

Question

How do I update Certain records in with Join and Where clause in Entity Framework Core? Using the template answer below (Attach/isModified)? https://stackoverflow.com/a/44247720/12425844

"If you don't want to use an SQL statement, you can use the Attach method in order to update an entity without having to load it first. As it's attached as Unchanged by default. You need to call make isModified = true "

Current requirement:

var data = _dbContext.Set<Product>()
    .Include(c => c.ProductType)
    .Where(x => x.Manufacturer == "ABC Company" &&
                x.StartYear == 2019 &&
                x.ProductType.ProductTypeDescription == "Electronics")

data.Manufacturer = "XYZ Company";
data.StartYear = 2020;
_dbContext.SaveChangesAsync();

Goal Code: Have to add where and join to find particular records:

https://stackoverflow.com/a/44247720/12425844

using (myDbEntities db = new myDbEntities())
{
    try
    {
      db.Configuration.AutoDetectChangesEnabled = false;

      MyObjectEntity entityToUpdate = new MyObjectEntity() {Manufacturer = "XYZ Company", StartYear =2020};
      db.Entry(entityToUpdate).Property(e => e.Manufacturer).IsModified = true;
      db.Entry(entityToUpdate).Property(e => e.StartYear).IsModified = true;

      db.SaveChanges();
    }
    finally
    {
      db.Configuration.AutoDetectChangesEnabled = true;
    }
}

Using EF Net Core 3.1,

Will not accept answers using Raw sql or EF Extensions for now, just Native EF Core

Answer 1

If EF Extensions is out, what about EFCore.BulkExtensions ?

await _dbContext.Set<Product>()
    .Where(x => x.Manufacturer == "ABC Company" &&
                x.StartYear == 2019 &&
                x.ProductType.ProductTypeDescription == "Electronics")
    .BatchUpdateAsync(x => new Product(){
                Manufacturer = "XYZ Company",
                StartYear = 2020 });

Note update is performed as raw sql, objects loaded into the change tracker are not updated. You may wish to surround the bulk operations and SaveChangesAsync in a transaction.

YMMV, I haven't used this library myself.