DataGridViewComboBoxColumn.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewComboBoxColumn.cs / 1305376 / DataGridViewComboBoxColumn.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 
    using System;
    using System.Text; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.Drawing.Design; 
    using System.Globalization;
 
    ///  
    [
        Designer("System.Windows.Forms.Design.DataGridViewComboBoxColumnDesigner, " + AssemblyRef.SystemDesign), 
        ToolboxBitmapAttribute(typeof(DataGridViewComboBoxColumn), "DataGridViewComboBoxColumn.bmp")
    ]
    public class DataGridViewComboBoxColumn : DataGridViewColumn
    { 
        private static Type columnType = typeof(DataGridViewComboBoxColumn);
 
        ///  
        public DataGridViewComboBoxColumn() : base(new DataGridViewComboBoxCell())
        { 
            ((DataGridViewComboBoxCell)base.CellTemplate).TemplateComboBoxColumn = this;
        }

        ///  
        [
            Browsable(true), 
            DefaultValue(true), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ComboBoxColumnAutoCompleteDescr) 
        ]
        public bool AutoComplete
        {
            get 
            {
                if (this.ComboBoxCellTemplate == null) 
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                return this.ComboBoxCellTemplate.AutoComplete;
            }
            set
            { 
                if (this.AutoComplete != value)
                { 
                    this.ComboBoxCellTemplate.AutoComplete = value; 
                    if (this.DataGridView != null)
                    { 
                        DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows;
                        int rowCount = dataGridViewRows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                        { 
                            DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                            DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                            if (dataGridViewCell != null) 
                            {
                                dataGridViewCell.AutoComplete = value; 
                            }
                        }
                    }
                } 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public override DataGridViewCell CellTemplate 
        {
            get 
            { 
                return base.CellTemplate;
            } 
            set
            {
                DataGridViewComboBoxCell dataGridViewComboBoxCell = value as DataGridViewComboBoxCell;
                if (value != null && dataGridViewComboBoxCell == null) 
                {
                    throw new InvalidCastException(SR.GetString(SR.DataGridViewTypeColumn_WrongCellTemplateType, "System.Windows.Forms.DataGridViewComboBoxCell")); 
                } 
                base.CellTemplate = value;
                if (value != null) 
                {
                    dataGridViewComboBoxCell.TemplateComboBoxColumn = this;
                }
            } 
        }
 
        private DataGridViewComboBoxCell ComboBoxCellTemplate 
        {
            get 
            {
                return (DataGridViewComboBoxCell) this.CellTemplate;
            }
        } 

        ///  
        [ 
            DefaultValue(null),
            SRCategory(SR.CatData), 
            SRDescription(SR.DataGridView_ComboBoxColumnDataSourceDescr),
            RefreshProperties(RefreshProperties.Repaint),
            AttributeProvider(typeof(IListSource)),
        ] 
        public object DataSource
        { 
            get 
            {
                if (this.ComboBoxCellTemplate == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                }
                return this.ComboBoxCellTemplate.DataSource; 
            }
            set 
            { 
                if (this.ComboBoxCellTemplate == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                }
                this.ComboBoxCellTemplate.DataSource = value;
                if (this.DataGridView != null) 
                {
                    DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                    int rowCount = dataGridViewRows.Count; 
                    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                    { 
                        DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                        DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell;
                        if (dataGridViewCell != null)
                        { 
                            dataGridViewCell.DataSource = value;
                        } 
                    } 
                    this.DataGridView.OnColumnCommonChange(this.Index);
                } 
            }
        }

        ///  
        [
            DefaultValue(""), 
            SRCategory(SR.CatData), 
            SRDescription(SR.DataGridView_ComboBoxColumnDisplayMemberDescr),
            TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, " + AssemblyRef.SystemDesign), 
            Editor("System.Windows.Forms.Design.DataMemberFieldEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor))
        ]
        public string DisplayMember
        { 
            get
            { 
                if (this.ComboBoxCellTemplate == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired)); 
                }
                return this.ComboBoxCellTemplate.DisplayMember;
            }
            set 
            {
                if (this.ComboBoxCellTemplate == null) 
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                this.ComboBoxCellTemplate.DisplayMember = value;
                if (this.DataGridView != null)
                {
                    DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                    int rowCount = dataGridViewRows.Count;
                    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) 
                    { 
                        DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                        DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                        if (dataGridViewCell != null)
                        {
                            dataGridViewCell.DisplayMember = value;
                        } 
                    }
                    this.DataGridView.OnColumnCommonChange(this.Index); 
                } 
            }
        } 

        /// 
        [
            DefaultValue(DataGridViewComboBoxDisplayStyle.DropDownButton), 
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ComboBoxColumnDisplayStyleDescr) 
        ] 
        public DataGridViewComboBoxDisplayStyle DisplayStyle
        { 
            get
            {
                if (this.ComboBoxCellTemplate == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                return this.ComboBoxCellTemplate.DisplayStyle; 
            }
            set 
            {
                if (this.ComboBoxCellTemplate == null)
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired)); 
                }
                this.ComboBoxCellTemplate.DisplayStyle = value; 
                if (this.DataGridView != null) 
                {
                    DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                    int rowCount = dataGridViewRows.Count;
                    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                    {
                        DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex); 
                        DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell;
                        if (dataGridViewCell != null) 
                        { 
                            dataGridViewCell.DisplayStyleInternal = value;
                        } 
                    }
                    // Calling InvalidateColumn instead of OnColumnCommonChange because DisplayStyle does not affect preferred size.
                    this.DataGridView.InvalidateColumn(this.Index);
                } 
            }
        } 
 
        /// 
        [ 
            DefaultValue(false),
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ComboBoxColumnDisplayStyleForCurrentCellOnlyDescr)
        ] 
        public bool DisplayStyleForCurrentCellOnly
        { 
            get 
            {
                if (this.ComboBoxCellTemplate == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                }
                return this.ComboBoxCellTemplate.DisplayStyleForCurrentCellOnly; 
            }
            set 
            { 
                if (this.ComboBoxCellTemplate == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                }
                this.ComboBoxCellTemplate.DisplayStyleForCurrentCellOnly = value;
                if (this.DataGridView != null) 
                {
                    DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                    int rowCount = dataGridViewRows.Count; 
                    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                    { 
                        DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                        DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell;
                        if (dataGridViewCell != null)
                        { 
                            dataGridViewCell.DisplayStyleForCurrentCellOnlyInternal = value;
                        } 
                    } 
                    // Calling InvalidateColumn instead of OnColumnCommonChange because DisplayStyleForCurrentCellOnly does not affect preferred size.
                    this.DataGridView.InvalidateColumn(this.Index); 
                }
            }
        }
 
        /// 
        [ 
            DefaultValue(1), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ComboBoxColumnDropDownWidthDescr), 
        ]
        public int DropDownWidth
        {
            get 
            {
                if (this.ComboBoxCellTemplate == null) 
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                return this.ComboBoxCellTemplate.DropDownWidth;
            }
            set
            { 
                if (this.DropDownWidth != value)
                { 
                    this.ComboBoxCellTemplate.DropDownWidth = value; 
                    if (this.DataGridView != null)
                    { 
                        DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows;
                        int rowCount = dataGridViewRows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                        { 
                            DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                            DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                            if (dataGridViewCell != null) 
                            {
                                dataGridViewCell.DropDownWidth = value; 
                            }
                        }
                    }
                } 
            }
        } 
 
        /// 
        [ 
            DefaultValue(FlatStyle.Standard),
            SRCategory(SR.CatAppearance),
            SRDescription(SR.DataGridView_ComboBoxColumnFlatStyleDescr),
        ] 
        public FlatStyle FlatStyle
        { 
            get 
            {
                if (this.CellTemplate == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                }
                return ((DataGridViewComboBoxCell) this.CellTemplate).FlatStyle; 
            }
            set 
            { 
                if (this.FlatStyle != value)
                { 
                    ((DataGridViewComboBoxCell)this.CellTemplate).FlatStyle = value;
                    if (this.DataGridView != null)
                    {
                        DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                        int rowCount = dataGridViewRows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) 
                        { 
                            DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                            DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                            if (dataGridViewCell != null)
                            {
                                dataGridViewCell.FlatStyleInternal = value;
                            } 
                        }
                        this.DataGridView.OnColumnCommonChange(this.Index); 
                    } 
                }
            } 
        }

        /// 
        [ 
            Editor("System.Windows.Forms.Design.StringCollectionEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Content), 
            SRCategory(SR.CatData), 
            SRDescription(SR.DataGridView_ComboBoxColumnItemsDescr)
        ] 
        public DataGridViewComboBoxCell.ObjectCollection Items
        {
            get
            { 
                if (this.ComboBoxCellTemplate == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired)); 
                }
                return this.ComboBoxCellTemplate.GetItems(this.DataGridView); 
            }
        }

        ///  
        [
            DefaultValue(""), 
            SRCategory(SR.CatData), 
            SRDescription(SR.DataGridView_ComboBoxColumnValueMemberDescr),
            TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, " + AssemblyRef.SystemDesign), 
            Editor("System.Windows.Forms.Design.DataMemberFieldEditor, " + AssemblyRef.SystemDesign, typeof(System.Drawing.Design.UITypeEditor))
        ]
        public string ValueMember
        { 
            get
            { 
                if (this.ComboBoxCellTemplate == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired)); 
                }
                return this.ComboBoxCellTemplate.ValueMember;
            }
            set 
            {
                if (this.ComboBoxCellTemplate == null) 
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                this.ComboBoxCellTemplate.ValueMember = value;
                if (this.DataGridView != null)
                {
                    DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                    int rowCount = dataGridViewRows.Count;
                    for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) 
                    { 
                        DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                        DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                        if (dataGridViewCell != null)
                        {
                            dataGridViewCell.ValueMember = value;
                        } 
                    }
                    this.DataGridView.OnColumnCommonChange(this.Index); 
                } 
            }
        } 

        /// 
        [
            DefaultValue(DataGridViewComboBoxCell.DATAGRIDVIEWCOMBOBOXCELL_defaultMaxDropDownItems), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ComboBoxColumnMaxDropDownItemsDescr) 
        ] 
        public int MaxDropDownItems
        { 
            get
            {
                if (this.ComboBoxCellTemplate == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                return this.ComboBoxCellTemplate.MaxDropDownItems; 
            }
            set 
            {
                if (this.MaxDropDownItems != value)
                {
                    this.ComboBoxCellTemplate.MaxDropDownItems = value; 
                    if (this.DataGridView != null)
                    { 
                        DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows; 
                        int rowCount = dataGridViewRows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) 
                        {
                            DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                            DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell;
                            if (dataGridViewCell != null) 
                            {
                                dataGridViewCell.MaxDropDownItems = value; 
                            } 
                        }
                    } 
                }
            }
        }
 
        /// 
        [ 
            DefaultValue(false), 
            SRCategory(SR.CatBehavior),
            SRDescription(SR.DataGridView_ComboBoxColumnSortedDescr) 
        ]
        public bool Sorted
        {
            get 
            {
                if (this.ComboBoxCellTemplate == null) 
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewColumn_CellTemplateRequired));
                } 
                return this.ComboBoxCellTemplate.Sorted;
            }
            set
            { 
                if (this.Sorted != value)
                { 
                    this.ComboBoxCellTemplate.Sorted = value; 
                    if (this.DataGridView != null)
                    { 
                        DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows;
                        int rowCount = dataGridViewRows.Count;
                        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                        { 
                            DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex);
                            DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell; 
                            if (dataGridViewCell != null) 
                            {
                                dataGridViewCell.Sorted = value; 
                            }
                        }
                    }
                } 
            }
        } 
 
        /// 
        public override object Clone() 
        {
            DataGridViewComboBoxColumn dataGridViewColumn;
            Type thisType = this.GetType();
 
            if (thisType == columnType) //performance improvement
            { 
                dataGridViewColumn = new DataGridViewComboBoxColumn(); 
            }
            else 
            {
                // SECREVIEW : Late-binding does not represent a security thread, see bug#411899 for more info..
                //
                dataGridViewColumn = (DataGridViewComboBoxColumn)System.Activator.CreateInstance(thisType); 
            }
            if (dataGridViewColumn != null) 
            { 
                base.CloneInternal(dataGridViewColumn);
                ((DataGridViewComboBoxCell) dataGridViewColumn.CellTemplate).TemplateComboBoxColumn = dataGridViewColumn; 
            }
            return dataGridViewColumn;
        }
 
        internal void OnItemsCollectionChanged()
        { 
            // Items collection of the CellTemplate was changed. 
            // Update the items collection of each existing DataGridViewComboBoxCell in the column.
            if (this.DataGridView != null) 
            {
                DataGridViewRowCollection dataGridViewRows = this.DataGridView.Rows;
                int rowCount = dataGridViewRows.Count;
                object[] items = ((DataGridViewComboBoxCell)this.CellTemplate).Items.InnerArray.ToArray(); 
                for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
                { 
                    DataGridViewRow dataGridViewRow = dataGridViewRows.SharedRow(rowIndex); 
                    DataGridViewComboBoxCell dataGridViewCell = dataGridViewRow.Cells[this.Index] as DataGridViewComboBoxCell;
                    if (dataGridViewCell != null) 
                    {
                        dataGridViewCell.Items.ClearInternal();
                        dataGridViewCell.Items.AddRangeInternal(items);
                    } 
                }
                this.DataGridView.OnColumnCommonChange(this.Index); 
            } 
        }
 
        /// 
        /// 
        ///    
        ///  
        public override string ToString()
        { 
            StringBuilder sb = new StringBuilder(64); 
            sb.Append("DataGridViewComboBoxColumn { Name=");
            sb.Append(this.Name); 
            sb.Append(", Index=");
            sb.Append(this.Index.ToString(CultureInfo.CurrentCulture));
            sb.Append(" }");
            return sb.ToString(); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DataGridViewComboBoxColumn.cs source code in C# .NET

Source code for the .NET framework in C#

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