Create multiple links and checkbox event responses in a DataGrid with code

datagrid| Create | link | response

This example uses code to create a DataGrid and respond to a checkbox event, and implements the multivariable transfer of a hyperlink column.

Create a front page

Createdatagrid.aspx:

Add a plcaeholder,id to the form "ph", runat= "Server"

Background page

CreateDatagrid.aspx.cs

public class CreateDataGrid:System.Web.UI.Page
{
public String sql = ' Select firstname,lastname,homephone,title from Employees ';
Public DataGrid Mygrid = new DataGrid ();
protected System.Web.UI.WebControls.PlaceHolder ph;
Public String SortExpression;
private void Page_Load (object sender, System.EventArgs e)
{
CREATEDATAGRIDFORM.CONTROLS.ADD (Makegrid ());

THIS.PH.CONTROLS.ADD (Makegrid ());
}
protected override void CreateChildControls ()
//        {

Base. CreateChildControls ();
//}

Code generated #region the Web forms Designer
Override protected void OnInit (EventArgs e)
{
//
CodeGen: This call is required for the ASP.net Web forms Designer.
//
InitializeComponent ();
Base. OnInit (e);
}

<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</summary>
private void InitializeComponent ()
{
This. Load + = new System.EventHandler (this. Page_Load);

}
#endregion
<summary>
Create a template column and a column template
</summary>

Public TemplateColumn TM = new TemplateColumn ();
Public Columntemplate MyCol = new Columntemplate ();

Back to DataView
Public DataView CreateDataSource ()
{
String strSQL;
strSQL = "Data source=localhost;initial catalog=northwind; User Id=sa; Password=sa; ";
SqlConnection conn = new SqlConnection (strSQL);
SqlDataAdapter db_sqladaptor = new SqlDataAdapter (Sql,conn);
DataSet ds = new DataSet ();
Db_sqladaptor. Fill (ds, "Employees");
DataView MyView = ds. tables["Employees"]. DefaultView;
Myview.sort=sortexpression;
Response.Write (SQL);
return myview;
}

<summary>
Handling sorting
</summary>
<param name= "Sender" ></param>
<param name= "E" ></param>
public void Sort_grid (Object sender, DataGridSortCommandEventArgs e)
{
SortExpression = E.sortexpression.tostring ();
session["SortField"]=sortexpression.trim ();
if (session["order"]==null) session["Order" = "ASC";
session["Order" = (session["order"). ToString () = = "DESC")? ASC ":" "DESC";
if (session["SortField"]==null) session["SortField"] = "FirstName";
SQL + = "ORDER By" +session["SortField"]. ToString () + "" + session["order"]. ToString ();
Mygrid. DataSource = CreateDataSource ();
Mygrid. DataBind ();
}
<summary>
Creates and sets the DataGrid property, where the property is set to a fixed value, but can also be set dynamically
</summary>
<returns></returns>

Public DataGrid Makegrid ()
{
Mygrid. cellpadding=2;
Mygrid. Attributes.Add ("Align", "center");
Mygrid. cellspacing=0;
Mygrid. width=500;
Mygrid. borderwidth=1;
Mygrid. Bordercolor=colortranslator.fromhtml ("Black");
Mygrid. Autogeneratecolumns=false;
Mygrid. Forecolor=colortranslator.fromhtml ("Black");
Mygrid. font.size=9;
Mygrid. Font.name= "Song Body";
Mygrid. Allowsorting=true;

Event handler for sort command

Mygrid. SortCommand + = new Datagridsortcommandeventhandler (Sort_grid);
Mygrid. ItemDataBound +=new Datagriditemeventhandler (mygrid_itemdatabound);

           ///settings HeaderStyle
             Mygrid. Headerstyle.backcolor=colortranslator.fromhtml ("Gold");
            Mygrid. Headerstyle.forecolor=colortranslator.fromhtml ("Black");
            Mygrid. Headerstyle.font.name= "Song Body";
            Mygrid. headerstyle.font.size=9;
            Mygrid. Headerstyle.font.bold=true;
            Mygrid. Headerstyle.horizontalalign=horizontalalign.center;

Set alternating style
Mygrid. Alternatingitemstyle.backcolor=colortranslator.fromhtml ("Silver");
Mygrid. Alternatingitemstyle.forecolor=colortranslator.fromhtml ("Black");

Set ItemStyle
Mygrid. Itemstyle.horizontalalign=horizontalalign.left;

To create bound columns and properties

HyperLinkColumn FirstName = new HyperLinkColumn ();
BoundColumn LastName = new BoundColumn ();
BoundColumn homephone = new BoundColumn ();
BoundColumn Title = new BoundColumn ();

firstname.headertext= "Name";
Firstname.datafield= "FirstName";
Firstname.sortexpression= "FirstName";

firstname.headertext= "Name";

Firstname.datatextfield = "FirstName";
Firstname.sortexpression= "FirstName";
Firstname.navigateurl = "http://localhost/test.aspx";

lastname.headertext= "Surname";
Lastname.datafield= "LastName";
Lastname.sortexpression= "LastName";

homephone.headertext= "Telephone";
Homephone.datafield= "HomePhone";
Homephone.sortexpression= "HomePhone";

title.headertext= "position";
Title.datafield= "Title";
Title.sortexpression= "Title";

            Mygrid. Columns.addat (0, FirstName);
            Mygrid. Columns.addat (1, LastName);
            Mygrid. Columns.addat (2, HomePhone);
            Mygrid. Columns.addat (3, Title);

Set up template column properties and ItemStyle templates
Tm. headertext= "* * Delete information * *";
Tm. Headerstyle.horizontalalign=horizontalalign.center;
Tm. Itemstyle.backcolor = colortranslator.fromhtml ("#FFF778");
Tm. Itemstyle.horizontalalign=horizontalalign.center;

TemplateColumn aa=new TemplateColumn ();
ColumnTemplate1 tt = new ColumnTemplate1 ();
Aa. ItemTemplate = TT;

Create a column template.
Column templates inherit from ITemplate
Tm. ItemTemplate = MyCol;
Mygrid. Columns.addat (4, TM);
Mygrid. Columns.addat (5,AA);

Binding and returning
Mygrid. DataSource = CreateDataSource ();
Mygrid. DataBind ();
return mygrid;
}

private void Mygrid_itemdatabound (object sender, DataGridItemEventArgs e)
{
if (E.item.itemtype = = ListItemType.Item | | e.item.itemtype = = listitemtype.alternatingitem)
{
HyperLink link = (HyperLink) e.item.cells[0]. Controls[0];
String url = link. NavigateUrl;
Implementing multiple Parameter Links
url = "? id=" + e.item.cells[1]. Text + "&id2=" + e.item.cells[2]. Text;
Link. NavigateUrl = URL;
}
}
}


add a few more critical segments

Columntemplate inherits from ITemplate.
"InstantiateIn" defines who the child controls belong to

public class Columntemplate:itemplate
{

public void InstantiateIn (Control container)
{
Label MyLabel = new label ();
mylabel.text= "click Delete";
CheckBox MyCheckBox = new checkbox ();
Container. Controls.Add (MyLabel);
Container. Controls.Add (MyCheckBox);
}

}

To add a CheckBox event:

public class Columntemplate1:itemplate
{

public void InstantiateIn (Control container)
{
Label MyLabel = new label ();
mylabel.text= "Test";
CheckBox lnk = new checkbox ();
Lnk. AutoPostBack = true;
Lnk. CheckedChanged +=new EventHandler (lnk_checkedchanged);
Container. Controls.Add (MyLabel);
Container. Controls.Add (LNK);
}

private void Lnk_checkedchanged (object sender, EventArgs e)
{
CheckBox lnk = (checkbox) sender;
DataGrid dg = (DataGrid) lnk. Namingcontainer.namingcontainer;
if (DG = null) return;
Implementing a CheckBox Event response
DataGridItem di = (DataGridItem) lnk. NamingContainer;
HyperLink lnkid= (HyperLink) di. Cells[0]. Controls[0];
String s2 = LnkID.Text.Trim () +lnk.id+ "was selected!" ";
}
}