当我使用Linq-to SQL将对象输入到数据库中时,是否可以获取刚插入的ID而不进行另一次数据库调用?我假设这很容易,我只是不知道如何。
将对象提交到db后,对象在其ID字段中接收值。
所以:
myObject.Field1 = "value";
// Db is the datacontext
db.MyObjects.InsertOnSubmit(myObject);
db.SubmitChanges();
// You can retrieve the id from the object
int id = myObject.ID;
插入生成的ID时会保存到正在保存的对象的实例中(参见下文):
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
试试这个:
MyContext Context = new MyContext();
Context.YourEntity.Add(obj);
Context.SaveChanges();
int ID = obj._ID;