DataGridViewBand Classe

Definizione

Rappresenta un insieme lineare di elementi in un controllo DataGridView.Represents a linear collection of elements in a DataGridView control.

public ref class DataGridViewBand : System::Windows::Forms::DataGridViewElement, ICloneable, IDisposable
public class DataGridViewBand : System.Windows.Forms.DataGridViewElement, ICloneable, IDisposable
type DataGridViewBand = class
    inherit DataGridViewElement
    interface ICloneable
    interface IDisposable
Public Class DataGridViewBand
Inherits DataGridViewElement
Implements ICloneable, IDisposable
Ereditarietà
DataGridViewBand
Derivato
Implementazioni

Esempi

Nell'esempio di codice seguente viene DataGridViewBand usato un oggetto per modificare le proprietà dei gruppi DataGridViewdi celle in un oggetto.The following code example uses a DataGridViewBand to manipulate properties of groups of cells in a DataGridView.

#using <System.Drawing.dll>
#using <System.dll>
#using <system.windows.forms.dll>
#using <system.drawing.dll>

using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System;
using namespace System::Collections;
public ref class DataGridViewBandDemo: public Form
{
private:

#pragma region S " form setup " 

public:
   DataGridViewBandDemo()
   {
      Button1 = gcnew Button;
      Button2 = gcnew Button;
      Button3 = gcnew Button;
      Button4 = gcnew Button;
      Button5 = gcnew Button;
      Button6 = gcnew Button;
      Button7 = gcnew Button;
      Button8 = gcnew Button;
      Button9 = gcnew Button;
      Button10 = gcnew Button;
      FlowLayoutPanel1 = gcnew FlowLayoutPanel;
      InitializeComponent();
      thirdColumnHeader = L"Main Ingredients";
      boringMeatloaf = L"ground beef";
      boringMeatloafRanking = L"*";
      AddButton( Button1, L"Reset", gcnew EventHandler( this, &DataGridViewBandDemo::Button1_Click ) );
      AddButton( Button2, L"Change Column 3 Header", gcnew EventHandler( this, &DataGridViewBandDemo::Button2_Click ) );
      AddButton( Button3, L"Change Meatloaf Recipe", gcnew EventHandler( this, &DataGridViewBandDemo::Button3_Click ) );
      AddAdditionalButtons();
      InitializeDataGridView();
   }

   DataGridView^ dataGridView;
   Button^ Button1;
   Button^ Button2;
   Button^ Button3;
   Button^ Button4;
   Button^ Button5;
   Button^ Button6;
   Button^ Button7;
   Button^ Button8;
   Button^ Button9;
   Button^ Button10;
   FlowLayoutPanel^ FlowLayoutPanel1;

private:
   void InitializeComponent()
   {
      FlowLayoutPanel1->Location = Point(454,0);
      FlowLayoutPanel1->AutoSize = true;
      FlowLayoutPanel1->FlowDirection = FlowDirection::TopDown;
      AutoSize = true;
      ClientSize = System::Drawing::Size( 614, 360 );
      FlowLayoutPanel1->Name = L"flowlayoutpanel";
      Controls->Add( this->FlowLayoutPanel1 );
      Text = this->GetType()->Name;
   }


#pragma endregion 
#pragma region S " setup DataGridView " 
   String^ thirdColumnHeader;
   String^ boringMeatloaf;
   String^ boringMeatloafRanking;
   bool boringRecipe;
   Boolean shortMode;
   void InitializeDataGridView()
   {
      dataGridView = gcnew System::Windows::Forms::DataGridView;
      Controls->Add( dataGridView );
      dataGridView->Size = System::Drawing::Size( 300, 200 );
      
      // Create an unbound DataGridView by declaring a
      // column count.
      dataGridView->ColumnCount = 4;
      AdjustDataGridViewSizing();
      
      // Set the column header style.
      DataGridViewCellStyle^ columnHeaderStyle = gcnew DataGridViewCellStyle;
      columnHeaderStyle->BackColor = Color::Aqua;
      columnHeaderStyle->Font = gcnew System::Drawing::Font( L"Verdana",10,FontStyle::Bold );
      dataGridView->ColumnHeadersDefaultCellStyle = columnHeaderStyle;
      
      // Set the column header names.
      dataGridView->Columns[ 0 ]->Name = L"Recipe";
      dataGridView->Columns[ 1 ]->Name = L"Category";
      dataGridView->Columns[ 2 ]->Name = thirdColumnHeader;
      dataGridView->Columns[ 3 ]->Name = L"Rating";
      
      // Populate the rows.
      array<String^>^row1 = gcnew array<String^>{
         L"Meatloaf",L"Main Dish",boringMeatloaf,boringMeatloafRanking
      };
      array<String^>^row2 = gcnew array<String^>{
         L"Key Lime Pie",L"Dessert",L"lime juice, evaporated milk",L"****"
      };
      array<String^>^row3 = gcnew array<String^>{
         L"Orange-Salsa Pork Chops",L"Main Dish",L"pork chops, salsa, orange juice",L"****"
      };
      array<String^>^row4 = gcnew array<String^>{
         L"Black Bean and Rice Salad",L"Salad",L"black beans, brown rice",L"****"
      };
      array<String^>^row5 = gcnew array<String^>{
         L"Chocolate Cheesecake",L"Dessert",L"cream cheese",L"***"
      };
      array<String^>^row6 = gcnew array<String^>{
         L"Black Bean Dip",L"Appetizer",L"black beans, sour cream",L"***"
      };
      array<Object^>^rows = gcnew array<Object^>{
         row1,row2,row3,row4,row5,row6
      };
      System::Collections::IEnumerator^ myEnum = rows->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         array<String^>^rowArray = safe_cast<array<String^>^>(myEnum->Current);
         dataGridView->Rows->Add( rowArray );
      }

      PostRowCreation();
      shortMode = false;
      boringRecipe = true;
   }

   void AddButton( Button^ button, String^ buttonLabel, EventHandler^ handler )
   {
      FlowLayoutPanel1->Controls->Add( button );
      button->TabIndex = FlowLayoutPanel1->Controls->Count;
      button->Text = buttonLabel;
      button->AutoSize = true;
      button->Click += handler;
   }


   // Reset columns to initial disorderly arrangement.
   void Button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      Controls->Remove( dataGridView );
      dataGridView->~DataGridView();
      InitializeDataGridView();
   }


   // Change the header in column three.
   void Button2_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      Toggle(  &shortMode );
      if ( shortMode )
      {
         dataGridView->Columns[ 2 ]->HeaderText = L"S";
      }
      else
      {
         dataGridView->Columns[ 2 ]->HeaderText = thirdColumnHeader;
      }
   }

   void Toggle( interior_ptr<Boolean> toggleThis )
   {
       *toggleThis =  ! *toggleThis;
   }


   // Change the meatloaf recipe.
   void Button3_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      Toggle(  &boringRecipe );
      if ( boringRecipe )
      {
         SetMeatloaf( boringMeatloaf, boringMeatloafRanking );
      }
      else
      {
         String^ greatMeatloafRecipe = L"1 lb. lean ground beef, "
         L"1/2 cup bread crumbs, 1/4 cup ketchup,"
         L"1/3 tsp onion powder, "
         L"1 clove of garlic, 1/2 pack onion soup mix "
         L" dash of your favorite BBQ Sauce";
         SetMeatloaf( greatMeatloafRecipe, L"***" );
      }
   }

   void SetMeatloaf( String^ recipe, String^ rating )
   {
      dataGridView->Rows[ 0 ]->Cells[ 2 ]->Value = recipe;
      dataGridView->Rows[ 0 ]->Cells[ 3 ]->Value = rating;
   }


#pragma endregion 
#pragma region S " demonstration code " 
   void AddAdditionalButtons()
   {
      AddButton( Button4, L"Freeze First Row", gcnew EventHandler( this, &DataGridViewBandDemo::Button4_Click ) );
      AddButton( Button5, L"Freeze Second Column", gcnew EventHandler( this, &DataGridViewBandDemo::Button5_Click ) );
      AddButton( Button6, L"Hide Salad Row", gcnew EventHandler( this, &DataGridViewBandDemo::Button6_Click ) );
      AddButton( Button7, L"Disable First Column Resizing", gcnew EventHandler( this, &DataGridViewBandDemo::Button7_Click ) );
      AddButton( Button8, L"Make ReadOnly", gcnew EventHandler( this, &DataGridViewBandDemo::Button8_Click ) );
      AddButton( Button9, L"Style Using Tag", gcnew EventHandler( this, &DataGridViewBandDemo::Button9_Click ) );
   }

   void AdjustDataGridViewSizing()
   {
      dataGridView->AutoSizeRowsMode = DataGridViewAutoSizeRowsMode::AllCells;
      dataGridView->ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode::AutoSize;
   }


   // Freeze the first row.
   void Button4_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      FreezeBand( dataGridView->Rows[ 0 ] );
   }

   void Button5_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      FreezeBand( dataGridView->Columns[ 1 ] );
   }

   void FreezeBand( DataGridViewBand^ band )
   {
      band->Frozen = true;
      DataGridViewCellStyle^ style = gcnew DataGridViewCellStyle;
      style->BackColor = Color::WhiteSmoke;
      band->DefaultCellStyle = style;
   }


   // Hide a band of cells.
   void Button6_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      DataGridViewBand^ band = dataGridView->Rows[ 3 ];
      band->Visible = false;
   }


   // Turn off user's ability to resize a column.
   void Button7_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      DataGridViewBand^ band = dataGridView->Columns[ 0 ];
      band->Resizable = DataGridViewTriState::False;
   }


   // Make the entire DataGridView read only.
   void Button8_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      System::Collections::IEnumerator^ myEnum = dataGridView->Columns->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         DataGridViewBand^ band = safe_cast<DataGridViewBand^>(myEnum->Current);
         band->ReadOnly = true;
      }
   }


   void PostRowCreation()
   {
      SetBandColor( dataGridView->Columns[ 0 ], Color::CadetBlue );
      SetBandColor( dataGridView->Rows[ 1 ], Color::Coral );
      SetBandColor( dataGridView->Columns[ 2 ], Color::DodgerBlue );
   }

   void SetBandColor( DataGridViewBand^ band, Color color )
   {
      band->Tag = color;
   }


   // Color the bands by the value stored in their tag.
   void Button9_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      IEnumerator^ myEnum1 = dataGridView->Columns->GetEnumerator();
      while ( myEnum1->MoveNext() )
      {
         DataGridViewBand^ band = static_cast<DataGridViewBand^>(myEnum1->Current);
         if ( band->Tag != nullptr )
         {
            band->DefaultCellStyle->BackColor =  *dynamic_cast<Color^>(band->Tag);
         }
      }

      IEnumerator^ myEnum2 = safe_cast<IEnumerable^>(dataGridView->Rows)->GetEnumerator();
      while ( myEnum2->MoveNext() )
      {
         DataGridViewBand^ band = safe_cast<DataGridViewBand^>(myEnum2->Current);
         if ( band->Tag != nullptr )
         {
            band->DefaultCellStyle->BackColor =  *dynamic_cast<Color^>(band->Tag);
         }
      }
   }


#pragma endregion 

public:
   static void Main()
   {
      Application::Run( gcnew DataGridViewBandDemo );
   }
};

int main()
{
   DataGridViewBandDemo::Main();
}

using System.Drawing;
using System.Windows.Forms;
using System;

public class DataGridViewBandDemo : Form
{
    #region "form setup"
    public DataGridViewBandDemo()
    {
        InitializeComponent();

        AddButton(Button1, "Reset",
            new EventHandler(Button1_Click));
        AddButton(Button2, "Change Column 3 Header",
            new EventHandler(Button2_Click));
        AddButton(Button3, "Change Meatloaf Recipe",
            new EventHandler(Button3_Click));
        AddAdditionalButtons();

        InitializeDataGridView();
    }

    DataGridView dataGridView;
    Button Button1 = new Button();
    Button Button2 = new Button();
    Button Button3 = new Button();
    Button Button4 = new Button();
    Button Button5 = new Button();
    Button Button6 = new Button();
    Button Button7 = new Button();
    Button Button8 = new Button();
    Button Button9 = new Button();
    Button Button10 = new Button();
    FlowLayoutPanel FlowLayoutPanel1 = new FlowLayoutPanel();

    private void InitializeComponent()
    {
        FlowLayoutPanel1.Location = new Point(454, 0);
        FlowLayoutPanel1.AutoSize = true;
        FlowLayoutPanel1.FlowDirection = FlowDirection.TopDown;
        AutoSize = true;
        ClientSize = new System.Drawing.Size(614, 360);
        FlowLayoutPanel1.Name = "flowlayoutpanel";
        Controls.Add(this.FlowLayoutPanel1);
        Text = this.GetType().Name;
    }
    #endregion

    #region "setup DataGridView"

    private string thirdColumnHeader = "Main Ingredients";
    private string boringMeatloaf = "ground beef";
    private string boringMeatloafRanking = "*";
    private bool boringRecipe;
    private bool shortMode;

    private void InitializeDataGridView()
    {
        dataGridView = new System.Windows.Forms.DataGridView();
        Controls.Add(dataGridView);
        dataGridView.Size = new Size(300, 200);

        // Create an unbound DataGridView by declaring a
        // column count.
        dataGridView.ColumnCount = 4;
        AdjustDataGridViewSizing();

        // Set the column header style.
        DataGridViewCellStyle columnHeaderStyle =
            new DataGridViewCellStyle();
        columnHeaderStyle.BackColor = Color.Aqua;
        columnHeaderStyle.Font =
            new Font("Verdana", 10, FontStyle.Bold);
        dataGridView.ColumnHeadersDefaultCellStyle =
            columnHeaderStyle;

        // Set the column header names.
        dataGridView.Columns[0].Name = "Recipe";
        dataGridView.Columns[1].Name = "Category";
        dataGridView.Columns[2].Name = thirdColumnHeader;
        dataGridView.Columns[3].Name = "Rating";

        // Populate the rows.
        string[] row1 = new string[]{"Meatloaf", 
                                        "Main Dish", boringMeatloaf, boringMeatloafRanking};
        string[] row2 = new string[]{"Key Lime Pie", 
                                        "Dessert", "lime juice, evaporated milk", "****"};
        string[] row3 = new string[]{"Orange-Salsa Pork Chops", 
                                        "Main Dish", "pork chops, salsa, orange juice", "****"};
        string[] row4 = new string[]{"Black Bean and Rice Salad", 
                                        "Salad", "black beans, brown rice", "****"};
        string[] row5 = new string[]{"Chocolate Cheesecake", 
                                        "Dessert", "cream cheese", "***"};
        string[] row6 = new string[]{"Black Bean Dip", "Appetizer",
                                        "black beans, sour cream", "***"};
        object[] rows = new object[] { row1, row2, row3, row4, row5, row6 };

        foreach (string[] rowArray in rows)
        {
            dataGridView.Rows.Add(rowArray);
        }

        PostRowCreation();

        shortMode = false;
        boringRecipe = true;
    }


    void AddButton(Button button, string buttonLabel,
        EventHandler handler)
    {
        FlowLayoutPanel1.Controls.Add(button);
        button.TabIndex = FlowLayoutPanel1.Controls.Count;
        button.Text = buttonLabel;
        button.AutoSize = true;
        button.Click += handler;
    }

    // Reset columns to initial disorderly arrangement.
    private void Button1_Click(object sender, System.EventArgs e)
    {
        Controls.Remove(dataGridView);
        dataGridView.Dispose();
        InitializeDataGridView();
    }

    // Change the header in column three.
    private void Button2_Click(object sender,
        System.EventArgs e)
    {
        Toggle(ref shortMode);
        if (shortMode)
        { dataGridView.Columns[2].HeaderText = "S"; }
        else
        { dataGridView.Columns[2].HeaderText = thirdColumnHeader; }
    }

    private static void Toggle(ref bool toggleThis)
    {
        toggleThis = !toggleThis;
    }

    // Change the meatloaf recipe.
    private void Button3_Click(object sender,
        System.EventArgs e)
    {
        Toggle(ref boringRecipe);
        if (boringRecipe)
        {
            SetMeatloaf(boringMeatloaf, boringMeatloafRanking);
        }
        else
        {
            string greatMeatloafRecipe =
                "1 lb. lean ground beef, " +
                "1/2 cup bread crumbs, 1/4 cup ketchup," +
                "1/3 tsp onion powder, " +
                "1 clove of garlic, 1/2 pack onion soup mix " +
                " dash of your favorite BBQ Sauce";
            SetMeatloaf(greatMeatloafRecipe, "***");
        }
    }

    private void SetMeatloaf(string recipe, string rating)
    {
        dataGridView.Rows[0].Cells[2].Value = recipe;
        dataGridView.Rows[0].Cells[3].Value = rating;
    }
    #endregion

    #region "demonstration code"
    private void AddAdditionalButtons()
    {
        AddButton(Button4, "Freeze First Row",
            new EventHandler(Button4_Click));
        AddButton(Button5, "Freeze Second Column",
            new EventHandler(Button5_Click));
        AddButton(Button6, "Hide Salad Row",
            new EventHandler(Button6_Click));
        AddButton(Button7, "Disable First Column Resizing",
            new EventHandler(Button7_Click));
        AddButton(Button8, "Make ReadOnly",
            new EventHandler(Button8_Click));
        AddButton(Button9, "Style Using Tag",
            new EventHandler(Button9_Click));
    }

    private void AdjustDataGridViewSizing()
    {
        dataGridView.AutoSizeRowsMode =
            DataGridViewAutoSizeRowsMode.AllCells;
        dataGridView.ColumnHeadersHeightSizeMode = 
            DataGridViewColumnHeadersHeightSizeMode.AutoSize;
    }

    // Freeze the first row.
    private void Button4_Click(object sender, System.EventArgs e)
    {

        FreezeBand(dataGridView.Rows[0]);
    }

    private void Button5_Click(object sender, System.EventArgs e)
    {

        FreezeBand(dataGridView.Columns[1]);
    }

    private static void FreezeBand(DataGridViewBand band)
    {
        band.Frozen = true;
        DataGridViewCellStyle style = new DataGridViewCellStyle();
        style.BackColor = Color.WhiteSmoke;
        band.DefaultCellStyle = style;
    }

    // Hide a band of cells.
    private void Button6_Click(object sender, System.EventArgs e)
    {

        DataGridViewBand band = dataGridView.Rows[3];
        band.Visible = false;
    }

    // Turn off user's ability to resize a column.
    private void Button7_Click(object sender, EventArgs e)
    {

        DataGridViewBand band = dataGridView.Columns[0];
        band.Resizable = DataGridViewTriState.False;
    }

    // Make the entire DataGridView read only.
    private void Button8_Click(object sender, System.EventArgs e)
    {
        foreach (DataGridViewBand band in dataGridView.Columns)
        {
            band.ReadOnly = true;
        }
    }

    private void PostRowCreation()
    {
        SetBandColor(dataGridView.Columns[0], Color.CadetBlue);
        SetBandColor(dataGridView.Rows[1], Color.Coral);
        SetBandColor(dataGridView.Columns[2], Color.DodgerBlue);
    }

    private static void SetBandColor(DataGridViewBand band, Color color)
    {
        band.Tag = color;
    }

    // Color the bands by the value stored in their tag.
    private void Button9_Click(object sender, System.EventArgs e)
    {

        foreach (DataGridViewBand band in dataGridView.Columns)
        {
            if (band.Tag != null)
            {
                band.DefaultCellStyle.BackColor = (Color)band.Tag;
            }
        }

        foreach (DataGridViewBand band in dataGridView.Rows)
        {
            if (band.Tag != null)
            {
                band.DefaultCellStyle.BackColor = (Color)band.Tag;
            }
        }
    }
    #endregion

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new DataGridViewBandDemo());
    }
}
Imports System.Windows.Forms
Imports System.Drawing

Public Class DataGridViewBandDemo
    Inherits Form

#Region "Form setup"
    Public Sub New()
        MyBase.New()
        InitializeComponent()

        AddButton(Button1, "Reset")
        AddButton(Button2, "Change Column 3 Header")
        AddButton(Button3, "Change Meatloaf Recipe")
        AddAdditionalButtons()
    End Sub

    Friend WithEvents dataGridView As DataGridView
    Friend WithEvents Button1 As Button = New Button()
    Friend WithEvents Button2 As Button = New Button()
    Friend WithEvents Button3 As Button = New Button()
    Friend WithEvents Button4 As Button = New Button()
    Friend WithEvents Button5 As Button = New Button()
    Friend WithEvents Button6 As Button = New Button()
    Friend WithEvents Button7 As Button = New Button()
    Friend WithEvents Button8 As Button = New Button()
    Friend WithEvents Button9 As Button = New Button()
    Friend WithEvents Button10 As Button = New Button()
    Friend WithEvents FlowLayoutPanel1 As FlowLayoutPanel _
        = New FlowLayoutPanel()

    Private Sub InitializeComponent()
        FlowLayoutPanel1.Location = New Point(454, 0)
        FlowLayoutPanel1.AutoSize = True
        FlowLayoutPanel1.FlowDirection = FlowDirection.TopDown
        FlowLayoutPanel1.Name = "flowlayoutpanel"
        ClientSize = New System.Drawing.Size(614, 360)
        Controls.Add(FlowLayoutPanel1)
        Text = Me.GetType.Name
        AutoSize = True
    End Sub
#End Region

#Region "setup DataGridView"
    Private thirdColumnHeader As String = "Main Ingredients"
    Private boringMeatloaf As String = "ground beef"
    Private boringMeatloafRanking As String = "*"
    Private boringRecipe As Boolean
    Private shortMode As Boolean

    Private Sub InitializeDataGridView(ByVal ignored As Object, _
    ByVal ignoredToo As EventArgs) Handles Me.Load

        dataGridView = New System.Windows.Forms.DataGridView
        Controls.Add(dataGridView)
        dataGridView.Size = New Size(300, 200)

        ' Create an unbound DataGridView by declaring a
        ' column count.
        dataGridView.ColumnCount = 4
        AdjustDataGridViewSizing()

        ' Set the column header style.
        Dim columnHeaderStyle As New DataGridViewCellStyle
        columnHeaderStyle.BackColor = Color.Aqua
        columnHeaderStyle.Font = _
            New Font("Verdana", 10, FontStyle.Bold)
        dataGridView.ColumnHeadersDefaultCellStyle = _
            columnHeaderStyle

        ' Set the column header names.
        dataGridView.Columns(0).Name = "Recipe"
        dataGridView.Columns(1).Name = "Category"
        dataGridView.Columns(2).Name = thirdColumnHeader
        dataGridView.Columns(3).Name = "Rating"

        ' Populate the rows.
        Dim row1 As String() = New String() _
            {"Meatloaf", "Main Dish", boringMeatloaf, _
            boringMeatloafRanking}
        Dim row2 As String() = New String() _
            {"Key Lime Pie", "Dessert", _
            "lime juice, evaporated milk", _
            "****"}
        Dim row3 As String() = New String() _
            {"Orange-Salsa Pork Chops", "Main Dish", _
            "pork chops, salsa, orange juice", "****"}
        Dim row4 As String() = New String() _
            {"Black Bean and Rice Salad", "Salad", _
            "black beans, brown rice", _
            "****"}
        Dim row5 As String() = New String() _
            {"Chocolate Cheesecake", "Dessert", "cream cheese", _
            "***"}
        Dim row6 As String() = New String() _
            {"Black Bean Dip", "Appetizer", _
            "black beans, sour cream", _
                "***"}
        Dim rows As Object() = New Object() {row1, row2, _
            row3, row4, row5, row6}

        Dim rowArray As String()
        For Each rowArray In rows
            dataGridView.Rows.Add(rowArray)
        Next

        PostRowCreation()

        shortMode = False
        boringRecipe = True
    End Sub

    Protected Sub AddButton(ByVal button As Button, _
        ByVal buttonLabel As String)

        FlowLayoutPanel1.Controls.Add(button)
        button.TabIndex = FlowLayoutPanel1.Controls.Count
        button.Text = buttonLabel
        button.AutoSize = True
    End Sub

    ' Reset columns to initial disorderly arrangement.
    Private Sub ResetToDisorder(ByVal sender As Object, _
        ByVal e As System.EventArgs) _
        Handles Button1.Click
        Controls.Remove(dataGridview)
        dataGridView.Dispose()
        InitializeDataGridView(Nothing, Nothing)
    End Sub

    ' Change the header in column three.
    Private Sub Button2_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) _
        Handles Button2.Click

        Toggle(shortMode)
        If shortMode Then dataGridView.Columns(2).HeaderText = _
            "S" _
            Else dataGridView.Columns(2).HeaderText = _
                thirdColumnHeader
    End Sub

    Private Shared Sub Toggle(ByRef toggleThis As Boolean)
        toggleThis = Not toggleThis
    End Sub

    ' Change the meatloaf recipe.
    Private Sub Button3_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) _
        Handles Button3.Click

        Toggle(boringRecipe)
        If boringRecipe Then
            SetMeatloaf(boringMeatloaf, boringMeatloafRanking)
        Else
            Dim greatMeatloafRecipe As String = "1 lb. lean ground beef, " _
                & "1/2 cup bread crumbs, 1/4 cup ketchup," _
                & "1/3 tsp onion powder, " _
                & "1 clove of garlic, 1/2 pack onion soup mix " _
                & " dash of your favorite BBQ Sauce"
            SetMeatloaf(greatMeatloafRecipe, "***")
        End If
    End Sub

    Private Sub SetMeatloaf(ByVal recipe As String, _
        ByVal rating As String)

        dataGridView.Rows(0).Cells(2).Value = recipe
        dataGridView.Rows(0).Cells(3).Value = rating
    End Sub
#End Region

#Region "demonstration code"
    Private Sub AddAdditionalButtons()
        AddButton(Button4, "Freeze First Row")
        AddButton(Button5, "Freeze Second Column")
        AddButton(Button6, "Hide Salad Row")
        AddButton(Button7, "Disable First Column Resizing")
        AddButton(Button8, "Make ReadOnly")
        AddButton(Button9, "Style Using Tag")
    End Sub

    Private Sub AdjustDataGridViewSizing()
        dataGridView.AutoSizeRowsMode = _
            DataGridViewAutoSizeRowsMode.AllCells
        dataGridView.ColumnHeadersHeightSizeMode = _
            DataGridViewColumnHeadersHeightSizeMode.AutoSize
    End Sub

    ' Freeze the first row.
    Private Sub Button4_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button4.Click

        FreezeBand(dataGridView.Rows(0))
    End Sub

    Private Sub FreezeColumn(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button5.Click

        FreezeBand(dataGridView.Columns(1))
    End Sub

    Private Shared Sub FreezeBand(ByVal band As DataGridViewBand)

        band.Frozen = True
        Dim style As DataGridViewCellStyle = New DataGridViewCellStyle()
        style.BackColor = Color.WhiteSmoke
        band.DefaultCellStyle = style

    End Sub

    ' Hide a band of cells.
    Private Sub Button6_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button6.Click

        Dim band As DataGridViewBand = dataGridView.Rows(3)
        band.Visible = False
    End Sub

    ' Turn off user's ability to resize a column.
    Private Sub Button7_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button7.Click

        Dim band As DataGridViewBand = dataGridView.Columns(0)
        band.Resizable = DataGridViewTriState.False
    End Sub

    ' Make the entire DataGridView read only.
    Private Sub Button8_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button8.Click

        For Each band As DataGridViewBand In dataGridView.Columns
            band.ReadOnly = True
        Next
    End Sub

    Private Sub PostRowCreation()
        SetBandColor(dataGridView.Columns(0), Color.CadetBlue)
        SetBandColor(dataGridView.Rows(1), Color.Coral)
        SetBandColor(dataGridView.Columns(2), Color.DodgerBlue)
    End Sub

    Private Shared Sub SetBandColor(ByVal band As DataGridViewBand, _
        ByVal color As Color)
        band.Tag = color
    End Sub

    ' Color the bands by the value stored in their tag.
    Private Sub Button9_Click(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Button9.Click

        For Each band As DataGridViewBand In dataGridView.Columns
            If band.Tag IsNot Nothing Then
                band.DefaultCellStyle.BackColor = _
                    CType(band.Tag, Color)
            End If
        Next

        For Each band As DataGridViewBand In dataGridView.Rows
            If band.Tag IsNot Nothing Then
                band.DefaultCellStyle.BackColor = _
                    CType(band.Tag, Color)
            End If
        Next
    End Sub
#End Region

    <STAThreadAttribute()> _
    Public Shared Sub Main()
        Application.Run(New DataGridViewBandDemo())
    End Sub
End Class

Commenti

La DataGridViewBand classe rappresenta DataGridViewCell elementi uniti in una banda che può essere modificata come gruppo.The DataGridViewBand class represents DataGridViewCell elements joined together in a band that can be manipulated as a group. Ogni elemento è in genere un'istanza DataGridViewCell di o una delle relative classi derivate.Each element is typically an instance of DataGridViewCell or one of its derived classes. Anche se DataGridViewHeaderCell a ogni banda è associato un oggetto, le celle di intestazione non vengono considerate elementi della banda.Although a DataGridViewHeaderCell is associated with each band, header cells are not considered elements of the band.

DataGridViewBandè la classe di base delle DataGridViewRow classi DataGridViewColumn e.DataGridViewBand is the base class of the DataGridViewRow and DataGridViewColumn classes. Non sono disponibili costruttori pubblici per il DataGridViewBand tipo, quindi l'unico modo per accedere a una banda è attraverso le colonne e le righe in un oggetto. DataGridViewThere are no public constructors for the DataGridViewBand type, so the only way to access a band is through columns and rows in a DataGridView.

Proprietà

ContextMenuStrip

Ottiene o imposta il menu di scelta rapida della banda.Gets or sets the shortcut menu for the band.

DataGridView

Ottiene il controllo DataGridView associato a questo elemento.Gets the DataGridView control associated with this element.

(Ereditato da DataGridViewElement)
DefaultCellStyle

Ottiene o imposta lo stile predefinito per le celle della banda.Gets or sets the default cell style of the band.

DefaultHeaderCellType

Ottiene o imposta il tipo in fase di esecuzione della cella di intestazione predefinita.Gets or sets the run-time type of the default header cell.

Displayed

Ottiene un valore che indica se la banda è attualmente visualizzata sullo schermo.Gets a value indicating whether the band is currently displayed onscreen.

Frozen

Ottiene o imposta un valore che indica se la banda si sposterà quando l'utente scorre l'oggetto DataGridView.Gets or sets a value indicating whether the band will move when a user scrolls through the DataGridView.

HasDefaultCellStyle

Ottiene un valore che indica se la proprietà DefaultCellStyle è stata impostata.Gets a value indicating whether the DefaultCellStyle property has been set.

HeaderCellCore

Ottiene o imposta la cella di intestazione dell'oggetto DataGridViewBand.Gets or sets the header cell of the DataGridViewBand.

Index

Ottiene la posizione relativa della banda all'interno del controllo DataGridView.Gets the relative position of the band within the DataGridView control.

InheritedStyle

Ottiene lo stile attivo della cella per la banda corrente, prendendo in considerazione l'ereditarietà dello stile.Gets the cell style in effect for the current band, taking into account style inheritance.

IsRow

Ottiene un valore che indica se la banda rappresenta una riga.Gets a value indicating whether the band represents a row.

ReadOnly

Ottiene o imposta un valore che indica se l'utente può modificare le celle della banda.Gets or sets a value indicating whether the user can edit the band's cells.

Resizable

Ottiene o imposta un valore che indica se è possibile ridimensionare la banda nell'interfaccia utente.Gets or sets a value indicating whether the band can be resized in the user interface (UI).

Selected

Ottiene o imposta un valore che indica se la banda è correntemente selezionata nell'interfaccia utente.Gets or sets a value indicating whether the band is in a selected user interface (UI) state.

State

Ottiene lo stato dell'interfaccia utente dell'elemento.Gets the user interface (UI) state of the element.

(Ereditato da DataGridViewElement)
Tag

Ottiene o imposta l'oggetto contenente i dati da associare alla banda.Gets or sets the object that contains data to associate with the band.

Visible

Ottiene o imposta un valore che indica se la banda è visibile all'utente.Gets or sets a value indicating whether the band is visible to the user.

Metodi

Clone()

Crea una copia esatta della banda.Creates an exact copy of this band.

Dispose()

Rilascia tutte le risorse usate da DataGridViewBand.Releases all resources used by the DataGridViewBand.

Dispose(Boolean)

Rilascia le risorse non gestite usate da DataGridViewBand e, facoltativamente, le risorse gestite.Releases the unmanaged resources used by the DataGridViewBand and optionally releases the managed resources.

Equals(Object)

Determina se l'oggetto specificato è uguale all'oggetto corrente.Determines whether the specified object is equal to the current object.

(Ereditato da Object)
Finalize()

Rilascia le risorse associate alla banda.Releases the resources associated with the band.

GetHashCode()

Funge da funzione hash predefinita.Serves as the default hash function.

(Ereditato da Object)
GetType()

Ottiene l'oggetto Type dell'istanza corrente.Gets the Type of the current instance.

(Ereditato da Object)
MemberwiseClone()

Crea una copia superficiale dell'oggetto Object corrente.Creates a shallow copy of the current Object.

(Ereditato da Object)
OnDataGridViewChanged()

Viene chiamato quando la banda è associata a un oggetto DataGridView differente.Called when the band is associated with a different DataGridView.

RaiseCellClick(DataGridViewCellEventArgs)

Genera l'evento CellClick.Raises the CellClick event.

(Ereditato da DataGridViewElement)
RaiseCellContentClick(DataGridViewCellEventArgs)

Genera l'evento CellContentClick.Raises the CellContentClick event.

(Ereditato da DataGridViewElement)
RaiseCellContentDoubleClick(DataGridViewCellEventArgs)

Genera l'evento CellContentDoubleClick.Raises the CellContentDoubleClick event.

(Ereditato da DataGridViewElement)
RaiseCellValueChanged(DataGridViewCellEventArgs)

Genera l'evento CellValueChanged.Raises the CellValueChanged event.

(Ereditato da DataGridViewElement)
RaiseDataError(DataGridViewDataErrorEventArgs)

Genera l'evento DataError.Raises the DataError event.

(Ereditato da DataGridViewElement)
RaiseMouseWheel(MouseEventArgs)

Genera l'evento MouseWheel.Raises the MouseWheel event.

(Ereditato da DataGridViewElement)
ToString()

Restituisce una stringa che rappresenta la banda corrente.Returns a string that represents the current band.

Si applica a

Vedi anche