在Asp.Net方法内部时，如何使用EF从表中删除行？

Question

我有这种方法：

[Route("Delete")]
public IHttpActionResult Delete()
{

}

我想做的是从这里的三个表中删除：

public System.Data.Entity.DbSet<SampleSentence> SampleSentences { get; set; } 
public System.Data.Entity.DbSet<Synonym> Synonyms { get; set; } 
public System.Data.Entity.DbSet<WordForm> WordForms { get; set; } 

我可以使用EF6中的删除功能删除所有行，还是应该以某种方式进行SQL调用？

Answer 1

假设您有一个DbContext派生类...

using (var transactionScope = new TransactionScope()) {
    try {
        string sql = @"
DELETE SampleSentence 
DELETE Synonym 
DELETE WordForm
";

        int count = myDbContext.Database.ExecuteSqlCommand(sql);
        if(count > 0) 
            transactionScope.Complete();
    } catch(Exception ex) {
        //Logging
    }
}

Answer 2

您可以使用这个EntityFramework.Extended库 ，借助它可以编写：

context.SampleSentences.Delete();
context.Synonyms.Delete();
context.WordForms.Delete();

Answer 3

我刚发现在stackoverflow

db.ProRel.RemoveRange(db.ProRel.Where(c => c.ProjectId == Project_id));

如何使用Entity Framework ASP.Net MVC 5删除多个记录？

但是我用这种方法删除一行

var Cert = (from cert in db.TblCompCertUploads where cert.CertID == ID select cert).FirstOrDefault();
if (Cert != null)
{
    db.TblCompCertUploads.DeleteObject(Cert);
    db.SaveChanges();
    ViewBag.Msg = "Deleted Successfully";
}

对于多行

List<tbl_CompCertificate> tbp = db.tbl_CompCertificate.Where(t => t.CompCer_CompId == CompId).ToList();
foreach (tbl_CompCertificate t in tbp)
{
    db.tbl_CompCertificate.DeleteObject(t);
    db.SaveChanges();
}