[英]asp.net - How to load values from database in user control?
I want to load values from database in user control 我想从用户控件中的数据库加载值
I could add more user control but I cant't able to load values in user control 我可以添加更多用户控件,但无法加载用户控件中的值
Code: 码:
Add.aspx.cs Add.aspx.cs
Below code is for adding more than one user control and retain the previous control values 下面的代码用于添加多个用户控件并保留以前的控件值
public List<string> NoOfControls
{
get
{
return ViewState["NoOfControls"] == null ? new List<string>() : (List<string>)ViewState["NoOfControls"];
}
set
{
ViewState["NoOfControls"] = value;
}
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
GenerateControls();
}
private void GenerateControls()
{
foreach (string i in NoOfControls)
{
VisaUserControl ctrl = (VisaUserControl)Page.LoadControl("VisaUserControl.ascx");
ctrl.ID = i;
this.rpt1.Controls.Add(ctrl);
}
}
protected void btnAddVisa_Click(object sender, EventArgs e)
{
List<string> temp = null;
var uc = (VisaUserControl)this.LoadControl(@"VisaUserControl.ascx");
string id = Guid.NewGuid().ToString();
uc.ID = id;
temp = NoOfControls;
temp.Add(id);
NoOfControls = temp;
rpt1.Controls.Add(uc);
}
Edit.aspx.cs Edit.aspx.cs
Below code is for loading values from database in user control 以下代码用于在用户控件中从数据库加载值
using (OleDbCommand cmd = new OleDbCommand("Select * from visa_details where emp_id = '"+ empid +"'", DbConnection))
using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
{
OleDbDataReader DR1 = cmd.ExecuteReader();
while(DR1.Read())
{
//Here I can get values
string visaNumb = DR1[2].ToString();
string visaCountry = DR1[3].ToString();
string visaType = DR1[4].ToString();
string visaEntry = DR1[5].ToString();
string expiryDate = DR1[6].ToString();
for (int i = 0; i < y; i++)
{
VisaUserControl userconrol = (VisaUserControl)Page.LoadControl("VisaUserControl.ascx");
userconrol.TextVisaNumber = visaNumb;
userconrol.VisaCountry = visaCountry;
userconrol.VisaType = visaType;
userconrol.VisaEntry = visaEntry;
userconrol.ExpiryDate = expiryDate;
repeater1.Controls.Add(userconrol);
}
}
}
.ascx.cs .ascx.cs
Here values are there but when it is loading all values are removed 此处有值,但在加载时将删除所有值
protected void Page_Load(object sender, EventArgs e)
{
txtUser.Text = Request.Form[txtUser.UniqueID];
dropCountry.SelectedValue = Request.Form[dropCountry.UniqueID];
dropVisa.SelectedValue = Request.Form[dropVisa.UniqueID];
dropEntry.SelectedValue = Request.Form[dropEntry.UniqueID];
txtDate.Text = Request.Form[txtDate.UniqueID];
}
public string TextVisaNumber
{
get { return txtUser.Text; }
set { txtUser.Text = value; }
}
public string VisaCountry
{
get { return dropCountry.SelectedValue; }
set { dropCountry.SelectedValue = value; }
}
public string VisaType
{
get { return dropVisa.SelectedValue; }
set { dropVisa.SelectedValue = value; }
}
public string VisaEntry
{
get { return dropEntry.SelectedValue; }
set { dropEntry.SelectedValue = value; }
}
public string ExpiryDate
{
get
{
return txtDate.Text;
}
set
{
txtDate.Text = value;
}
}
Any ideas? 有任何想法吗? Thanks in advance 提前致谢
与其在页面的控件集合中添加控件,不如在现有控件的内部HTML中保留数据集。
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