C# SqlDependency没有选择性地工作?
我试图观察SQL server express 2005中的一些数据,如下所示:C# SqlDependency没有选择性地工作?,c#,sql-server-2005,sqldependency,C#,Sql Server 2005,Sqldependency,我试图观察SQL server express 2005中的一些数据,如下所示: SqlDependency.Stop(connectionString); SqlDependency.Start(connectionString); using (var con = new SqlConnection(connectionString)) { con.Open(); var queryString = "SELECT [Name] FROM [dbo].[Persons]"
SqlDependency.Stop(connectionString);
SqlDependency.Start(connectionString);
using (var con = new SqlConnection(connectionString))
{
con.Open();
var queryString = "SELECT [Name] FROM [dbo].[Persons]";
var command = new SqlCommand(queryString, con);
var dependency = new SqlDependency(command);
dependency.OnChange += OnQueryChanged;
command.ExecuteReader();
}
var context = new Entities();
context.Persons.First().Street = "Foo";
context.SaveChanges();
问题是,我只对“Name”列更改时的回调感兴趣。但是,如果表“Persons”的另一列发生更改,也会调用OnQueryChanged,如下所示:
SqlDependency.Stop(connectionString);
SqlDependency.Start(connectionString);
using (var con = new SqlConnection(connectionString))
{
con.Open();
var queryString = "SELECT [Name] FROM [dbo].[Persons]";
var command = new SqlCommand(queryString, con);
var dependency = new SqlDependency(command);
dependency.OnChange += OnQueryChanged;
command.ExecuteReader();
}
var context = new Entities();
context.Persons.First().Street = "Foo";
context.SaveChanges();
这是SqlDependency的预期行为还是我在使用中犯了错误?似乎只能观察整个表(http://social.msdn.microsoft.com/Forums/en-US/sqlservicebroker/thread/acb94617-bafc-4e28-bc63-ddfd23ab2379)-这是否正确?将来,您应该编辑原始问题,而不是添加答案。