[c#] LINQ插入后可以返回'id'字段吗?



Answers

插入生成的ID时保存到正在保存的对象的实例中(见下文):

protected void btnInsertProductCategory_Click(object sender, EventArgs e)
{
  ProductCategory productCategory = new ProductCategory();
  productCategory.Name = “Sample Category”;
  productCategory.ModifiedDate = DateTime.Now;
  productCategory.rowguid = Guid.NewGuid();
  int id = InsertProductCategory(productCategory);
  lblResult.Text = id.ToString();
}

//Insert a new product category and return the generated ID (identity value)
private int InsertProductCategory(ProductCategory productCategory)
{
  ctx.ProductCategories.InsertOnSubmit(productCategory);
  ctx.SubmitChanges();
  return productCategory.ProductCategoryID;
}

参考: http://blog.jemm.net/articles/databases/how-to-common-data-patterns-with-linq-to-sql/#4 : http://blog.jemm.net/articles/databases/how-to-common-data-patterns-with-linq-to-sql/#4

Question

当我用Linq-to-SQL将对象输入到数据库中时,我可以获得我刚刚插入的ID,而无需进行其他数据库调用? 我认为这很容易,我只是不知道如何。






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