Sometimes we need (1) use the drop-down box when edited, and the default is the content of the database (2) Use the drop-down box filtering data (3) Use the CSS unified DataGrid to give the code: Data structure: Table DEP: Depid (Identify Primary Key), DepName (College Name) Table Stu: Stuid (Identifier Primary Key), Stuname (Student Name), StudiePid (College ID = Table Dep.DEPID) Front Desk: <% @ Page Language = "CODEBEHIND =" Webform28.aspx.cs "autoeventwireup =" false "inherits =" 9cbs.webform28 "%>
WebForm28 </ title> <meta name = "GENERATOR" Content = "Microsoft Visual Studio .NET 7.1"> <meta name = "CODE_LANGUAGE" Content = "C #"> <meta name = "vs_defaultClientScript" content = "JavaScript"> < Link href = "css.css" rel = "stylesheet" type = "text / css"> <meta name = "vs_targetschema" content = "http://schemas.microsoft.com/intellisense/ie5> </ head> <body> <form id = "form1" method = "post" runat = "server"> <ask = "dropdownload1" runat = "server" autopostback = "true"> </ ask: DropDownList> <asp: DataGrid ID = "DataGrid1" runat = "server" autogeneratecolumns = "false" cellspacing = "1" borderwidth = "0px" cellpadding = "5" cssclass = "border" OneDitcom Mand = "edit" oncancelcommand = "cancel" onupdateCommand = "Update" Datakeyfield =</p>
<p>"Stuid"> <ItemStyle CssClass = "item"> </ ItemStyle> <HeaderStyle CssClass = "header"> </ HeaderStyle> <Columns> <asp: TemplateColumn HeaderText = "Name"> <ItemTemplate> <% # DataBinder.Eval (Container.DataItem, "stuname")%> <edititemtemplate> <edititemtemplate> <ask: textbox id = "name" runat = "server" text = '<% # databinder.eval (container.DataItem, "stuname") %> 'Width = "88px"> </ asp: textbox> </ edititemtemplate> </ ask: templateColumn> <ask: templatecolumn headertext = "college"> <itemtemplate> <% # databinder.eval (container.DataItem, " depname ")%> </ ItemTemplate> <EditItemTemplate> <asp: DropDownList ID =" dep "Runat =" server "> </ asp: DropDownList> </ EditItemTemplate> </ asp: TemplateColumn> <asp: EditCommandColumn ButtonType =" PushButton "UpdateText =" Update "CancelText =" Cancel "EditText =" Edit "> </ asp: EditCommandColumn> </ Column> </ asp: DataGrid> </ form> </ body> </ html> Backstage: USING SYSTEM Using system.collections; using system.componentmodel; u sing System.Data; using System.Data.SqlClient; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web. Ui.htmlControls;</p>
<p>Namespace 9cbs {/// <summary> /// WebFORM28 summary description. /// </ summary> public class WebForm28: System.Web.UI.Page {protected System.Web.UI.WebControls.DropDownList DropDownList1; protected System.Web.UI.WebControls.DataGrid DataGrid1; private void Page_Load (object sender, System.Eventargs e) {// Place the user code here to initialize the page if (! Ispostback) {setbind (); setbind2 ();}} protected void setbind ()}</p>
<p>SqlConnection conn = new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings [ "conn"]); SqlDataAdapter da = new SqlDataAdapter ( "select * from stu, dep where stu.studepid = dep.depid", conn); DataSet ds = new DataSet (); da.fill (DS, "Table1"); this.dataGrid1.datasource = ds.tables ["Table1"]; this.dataGrid1.databind ();}</p>
<p>protected void setbind2 () {</p>
<p>SqlConnection conn2 = new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings [ "conn"]); SqlDataAdapter da2 = new SqlDataAdapter ( "select * from dep", conn2); DataSet ds2 = new DataSet (); da2.Fill (ds2, "table1"); this.DropDownList1.DataSource = ds2.Tables [ "table1"]; this.DropDownList1.DataTextField = "depname"; this.DropDownList1.DataValueField = "depid"; this.DropDownList1.DataBind (); this. DropdownList1.Items.Insert (0, New ListItem ";</p>
<p>protected void SetBind3 () {string s = this.DropDownList1.SelectedValue; SqlConnection conn = new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings [ "conn"]); SqlCommand comm = new SqlCommand (); comm.Connection = conn; if (S! = "") {Comm.commandtext = "SELECT * from STU, Dep where stu.studepid = Dep.Depid and depid = @ depid"; sqlparameter parm1 = new sqlparameter ("@ depid", sqldbtype.It); parm1.Value = s; comm.Parameters.Add (parm1);} else comm.CommandText = "select * from stu, dep where stu.studepid = dep.depid"; SqlDataAdapter da = new SqlDataAdapter (); da.SelectCommand = Comm; DataSet DS = New Dataset (); DA.FILL (DS, "Table1"); this.dataGrid1.datasource = DS.TABLES ["Table1"]; this.dataGrid1.database ();} #Region Web Form The code generated by the designer Override protected void Oninit (Eventargs E) {// // Codegen: This call is necessary for the ASP.NET Web Form Designer. // InitializeComponent (); base.onit (e);} /// <summary> /// Designer Supports the required method - Do not use the code editor to modify the // / this method. /// </ summary> private void InitializeComponent () {this.DataGrid1.ItemDataBound = new System.Web.UI.WebControls.DataGridItemEventHandler (this.DataGrid1_ItemDataBound); this.DropDownList1.SelectedIndexChanged = new System.EventHandler (this. DropDownList1_selected; this.load = new system.eventhandler (this.page_load);} #ENDREGION</p>
<p>private void DataGrid1_ItemDataBound (object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) {SqlConnection conn = new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings [ "conn"]); SqlDataAdapter da = new SqlDataAdapter ( "select * from dep ", conn); DataSet DS = New Dataset (); DA.FILL (DS," Table1 "); if (E.Item.itemType == ListItemType.editItem) {DropDownList DDL = (DropDownList) E.Item.FindControl "dep"); ddl.datasource = ds.tables ["Table1"]; ddl.datatextfield = "depname"; DDL.DataValuefield = "depid"; ddl.database (); ddl.items.FindByValue (Convert.Tostring DataBinder.eval ("DEPID"))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))). Item.itemindex; if (this.dropdownList1.selectedValue == "") setbind (); else setbind3 ();</p>
<p>Protected Void Cancel (Object Sender, DataGridCommandeventArgs E) {this.dataGrid1.editItemIndex = -1; if (this.dropdownList1.SelectedValue == ") setbind (); else setbind3 ();}</p>
<p>protected void update (object sender, DataGridCommandEventArgs e) {if (e.Item.ItemType == ListItemType.EditItem) // pressed to edit only after submission {SqlConnection conn = new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings [ " conn "]); SqlCommand comm = new SqlCommand (" update stu set stuname = @ name, studepid = @ depid where stuid = @ id ", conn); SqlParameter parm1 = new SqlParameter (" @ name ", SqlDbType.NVarChar, 50 ); Parm1.value = ((TextBox) E.Item.FindControl ("name"))). Text; sqlparameter parm2 = new sqlparameter ("@ depid", sqldbtype.int); parm2.value = ((DropDownList) E. Item.FindControl ("dep")). SelectedValue; SQLParameter Parm3 = New SQLParameter ("@ id", sqldbtype.INT); PARM3.Value = this.dataGrid1.DataKeys [E.Item.itemindex]; Comm.Parameters.Add (PARM1); Comm.Parameters.Add (PARM2); Comm.Parameters.Add (PARM3); conn.open (); Comm.ExecutenonQuery (); conn.close (); this.dataGrid1.edititeMindex = -1; if; if (this.dropdownList1.selectedValue == "") setbind (); else setbind3 (); // Selected filtered using SetBind3 ()}} private void DropDownList1_SelectedIndexChanged (object sender, System.EventArgs e) {SetBind3 ();}}} css: .border {background-color: # 00496C;} header {font-family:. " Song Song ", SANS-Serif; Font-Size: 10pt; Font-Weight: bold; color: #fffff; Background-Color: # 0080c0; Text-Align: center;}. Item {font-family:" Song ", SANS -serif; font-size: 9pt; font-weight: Normal; Color: # 0080c0; Background-Color: #fffff; Text-Align: center;</p>
<p>The code is relatively simple, and the following is briefly explained: (1) setbind () is the basic binding; setbind2 () is the DROPDOWNLIST that is bound to be outside; setbind3 () is the binding of DataGrid after filtering after the drop-down box ( 2) Use the CSS to implement the table border to utilize CellSpacing, so this value is the width of the border, using Background-Color in the CSS of the Table Border to describe the color of the border. Below is some index of DataGrid this site: DataGrid implementation to delete (with prompt) to change the paging binding Dynamically changed DataGrid DataGrid in DataGrid Setting multiple parameters DataGrid Implement Self-amplification, radio, multi-selection DataGrid data export Several methods of downloading the Excel files DataGrid and DropDownList's cooperation and using CSS custom DataGrid</p></div><div class="text-center mt-3 text-grey">
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