如何使用Sqldependency自动更新页面加载 [英] How auto update pageload using Sqldependency
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问题描述
我正在尝试从Web表单运行sqldependency方法。我从一个窗口形式创建了UpdateMethod。
然而,当网页版本发生变化时,网页格式版本不会在客户端自动更新页面加载数据库,而窗口形式。
窗口形式方法版本:
I am trying to run a sqldependency method from a web form. I created "UpdateMethod", from a window-form.
However the web-form version, does not update the page-load automatically on the client-side, when there is a change in the database, whereas window-form does.
Window form method version:
delegate void GridDelegate(DataTable table);
private void UpdateGrid()
{
string sql = "SELECT * FROM [dbo].[User]";
DataTable dt = new DataTable();
using (SqlConnection con = new SqlConnection(connectionstring))
{
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
dep = new SqlDependency(cmd); //Passing Command to SQL dependency
dep.OnChange += dep_OnChange;
using (SqlDataReader rdr = cmd.ExecuteReader())
{
dt.Load(rdr);
}
}
}
dataGridView1.Invoke((GridDelegate)delegate(DataTable table)
{ dataGridView1.DataSource = table; }, dt);
}
///////网页表单///// ///////
Web表单方法版本:
/////// web form ////////////
Web-form method version:
private void UpdateGrid()
{
string sql = "SELECT * FROM [dbo].[User] order by uploadDate desc";
DataTable dt = new DataTable();
using (SqlConnection con = new SqlConnection(GetConnectionString()))
{
try
{
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
SqlDependency dep;
dep = new SqlDependency(cmd); //Passing Command to SQL dependency
dep.OnChange += dep_OnChange;
using (SqlDataReader rdr = cmd.ExecuteReader())
{
dt.Load(rdr);
// GridView1.DataSource = rdr;
}
}
}
catch (Exception ex)
{
throw ex;
}
}
GridView1.DataSource = dt;
GridView1.DataBind();
}
我错过了我的网络表单方法。请指教。非常感谢。
Am I missing something from my web-form method. Please advice. Many thanks.
推荐答案
请查看以下链接
http://stackoverflow.com/questions/7200443 / asp-net-webforms-how-to-avoid-some-page-load-events-when-a-link-is-clicke [ ^ ]
http:// stackoverflow。 com / questions / 8092554 / asp-net-page-load-event [ ^ ]
please check the below link
http://stackoverflow.com/questions/7200443/asp-net-webforms-how-to-avoid-several-page-load-events-when-a-link-is-clicke[^]
http://stackoverflow.com/questions/8092554/asp-net-page-load-event[^]
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