ASP.NET GridView deuxième ligne d'en-tête à la travée principale ligne d'en-tête

J'ai pris la accepté de répondre approche, mais a ajouté l'en-tête de l'existant GridView au lieu d'une coutume héritée GridView.

Après je lier mon GridView, je ne les suivants:

/*Create header row above generated header row*/

//create row    
GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal);

//spanned cell that will span the columns I don't want to give the additional header 
TableCell left = new TableHeaderCell();
left.ColumnSpan = 6;
row.Cells.Add(left);

//spanned cell that will span the columns i want to give the additional header
TableCell totals = new TableHeaderCell();
totals.ColumnSpan = myGridView.Columns.Count - 3;
totals.Text = "Additional Header";
row.Cells.Add(totals);

//Add the new row to the gridview as the master header row
//A table is the only Control (index[0]) in a GridView
((Table)myGridView.Controls[0]).Rows.AddAt(0, row);

/*fin*/

Vous aurez à créer une classe qui étend gridview ensuite remplacer le CreateRow méthode.

essayer cette comme un point de départ

Veuillez vous référer à https://stackoverflow.com/a/9333714/1060656

j'ai créé cette solution exemple

À exécuter dans votre système local aurez besoin de créer 2 fichiers ( un pour le contrôle et l'un aspx), vous pouvez soit faire un projet ou 2 projets.

1. GridViewPlus ==> classe de Contrôle
2. GridViewPlusCustomHeaderRows ==> une collection de tenir personnalisé en-tête de la classe
3. CustomHeaderEventArgs ==> Événement Args où la ligne d'en-tête est créé

4. fichier aspx ==> programme de Test

   public class GridViewPlus : GridView
   {
   public event EventHandler<CustomHeaderEventArgs> CustomHeaderTableCellCreated;
   private GridViewPlusCustomHeaderRows _rows;
   public GridViewPlus() : base ()
   {
   _rows = new GridViewPlusCustomHeaderRows();
   }
   ///<summary>
   ///Allow Custom Headers
   ///</summary>
   public bool ShowCustomHeader { get; set; }
   [PersistenceMode(PersistenceMode.InnerDefaultProperty)]
   [MergableProperty(false)]
   public GridViewPlusCustomHeaderRows CustomHeaderRows
   {
   get {return  _rows; }
   }
   protected virtual void OnCustomHeaderTableCellCreated(CustomHeaderEventArgs e)
   {
   EventHandler<CustomHeaderEventArgs> handler = CustomHeaderTableCellCreated;
   //Event will be null if there are no subscribers
   if (handler != null)
   {
   //Use the () operator to raise the event.
   handler(this, e);
   }
   }
   protected override void OnRowCreated(GridViewRowEventArgs e)
   {
   if (ShowCustomHeader && e.Row.RowType == DataControlRowType.Header) return;
   base.OnRowCreated(e);
   }
   protected override void PrepareControlHierarchy()
   {
   //Do not show the Gridview header if show custom header is ON
   if (ShowCustomHeader) this.ShowHeader = false;
   base.PrepareControlHierarchy();
   //Safety Check
   if (this.Controls.Count == 0)
   return;
   bool controlStyleCreated = this.ControlStyleCreated;
   Table table = (Table)this.Controls[0];
   int j = 0;
   if (CustomHeaderRows ==null )return ;
   foreach (TableRow tr in CustomHeaderRows)
   {
   OnCustomHeaderTableCellCreated(new CustomHeaderEventArgs(tr,j));
   table.Rows.AddAt(j, tr);
   tr.ApplyStyle(this.HeaderStyle);
   j++;
   }
   }
   }
   public class GridViewPlusCustomHeaderRows : System.Collections.CollectionBase
   {
   public GridViewPlusCustomHeaderRows()
   {
   }
   public void Add(TableRow aGridViewCustomRow)
   {
   List.Add(aGridViewCustomRow);
   }
   public void Remove(int index)
   {
   //Check to see if there is a widget at the supplied index.
   if (index > Count - 1 || index < 0)
   //If no widget exists, a messagebox is shown and the operation 
   //is cancelled.
   {
   throw (new Exception("Index not valid"));
   }
   else
   {
   List.RemoveAt(index);
   }
   }
   public TableRow Item(int Index)
   {
   //The appropriate item is retrieved from the List object and
   //explicitly cast to the Widget type, then returned to the 
   //caller.
   return (TableRow)List[Index];
   }
   }
   public class CustomHeaderEventArgs : EventArgs
   {
   public CustomHeaderEventArgs(TableRow tr ,int RowNumber  )
   {
   tRow = tr;
   _rownumber = RowNumber;
   }
   private TableRow tRow;
   private int _rownumber = 0;
   public int RowNumber { get { return _rownumber; } }
   public TableRow HeaderRow
   {
   get { return tRow; }
   set { tRow = value; }
   }
   }
   public partial class _Default : System.Web.UI.Page
   {
   protected void Page_Load(object sender, EventArgs e)
   {
   Example1();
   GridViewExtension1.CustomHeaderTableCellCreated += new EventHandler<CustomHeaderEventArgs>(GridViewExtension1_CustomHeaderTableCellCreated);
   }
   void GridViewExtension1_CustomHeaderTableCellCreated(object sender, CustomHeaderEventArgs e)
   {
   TableRow tc = (TableRow)e.HeaderRow;
   tc.BackColor = System.Drawing.Color.AliceBlue;
   }
   private void Example1()
   {
   System.Data.DataTable dtSample = new DataTable();
   DataColumn dc1 = new DataColumn("Column1",typeof(string));
   DataColumn dc2 = new DataColumn("Column2",typeof(string));
   DataColumn dc3 = new DataColumn("Column3",typeof(string));
   DataColumn dc4 = new DataColumn("Column4",typeof(string));
   //DataColumn dc5 = new DataColumn("Column5",typeof(string));
   dtSample.Columns.Add(dc1);
   dtSample.Columns.Add(dc2);
   dtSample.Columns.Add(dc3);
   dtSample.Columns.Add(dc4);
   //dtSample.Columns.Add(dc5);
   dtSample.AcceptChanges();
   for (int i = 0; i < 25; i++)
   {
   DataRow dr = dtSample.NewRow();
   for (int j = 0; j < dtSample.Columns.Count; j++)
   {
   dr[j] = j;
   }
   dtSample.Rows.Add(dr);
   }
   dtSample.AcceptChanges();
   //GridViewExtension1.ShowHeader = false;
   GridViewExtension1.ShowCustomHeader = true;
   /*
   *=======================================================================
   *  |Row 1 Cell 1   |   Row 1 Col 2 (Span=2)        | Row 1 Col 3   |
   *  |               |                               |               |
   *=======================================================================             
   *  |Row 2 Cell 1   |               |               |               |
   *  |               |   Row 2 Col 2 | Row 2 Col 3   |Row 2 Col 4    |
   *=======================================================================
   * 
   * 
   * 
   * 
   * */
   //SO we have to make 2 header row as shown above
   TableRow TR1 = new TableRow();
   TableCell tcR1C1 = new TableCell();
   tcR1C1.Text = "Row 1 Cell 1";
   tcR1C1.ColumnSpan = 1;
   TR1.Cells.Add(tcR1C1);       
   TableCell tcR1C2 = new TableCell();
   tcR1C2.Text = "Row 1 Cell 2";
   tcR1C2.ColumnSpan = 2;
   TR1.Cells.Add(tcR1C2);  
   TableCell tcR1C3 = new TableCell();
   tcR1C3.Text = "Row 1 Cell 3";
   tcR1C3.ColumnSpan = 1;
   TR1.Cells.Add(tcR1C3);
   GridViewExtension1.CustomHeaderRows.Add(TR1);
   TableRow TR2 = new TableRow();
   TableCell tcR2C1 = new TableCell();
   tcR2C1.Text = "Row 2 Cell 1";
   tcR2C1.ColumnSpan = 1;
   TR2.Cells.Add(tcR2C1);
   TableCell tcR2C2 = new TableCell();
   tcR2C2.Text = "Row 2 Cell 2";
   tcR2C2.ColumnSpan = 1;
   TR2.Cells.Add(tcR2C2);
   TableCell tcR2C3 = new TableCell();
   tcR2C3.Text = "Row 2 Cell 3";
   tcR2C3.ColumnSpan = 1;
   TR2.Cells.Add(tcR2C3);
   TableCell tcR2C4 = new TableCell();
   tcR2C4.Text = "Row 2 Cell 4";
   tcR2C4.ColumnSpan = 1;
   TR2.Cells.Add(tcR2C4);
   GridViewExtension1.CustomHeaderRows.Add(TR2);
   GridViewExtension1.DataSource = dtSample;
   GridViewExtension1.DataBind();
   }
   }