ButtonColumn.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ButtonColumn.cs / 1 / ButtonColumn.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Globalization;
    using System.Web;
    using System.Web.UI; 
    using System.Security.Permissions;
    using System.Web.Util; 
 

    ///  
    /// Creates a column with a set of 
    /// controls.
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class ButtonColumn : DataGridColumn { 
 
        private PropertyDescriptor textFieldDesc;
 

        /// 
        /// Initializes a new instance of the  class.
        ///  
        public ButtonColumn() {
        } 
 

 
        /// 
        ///    Gets or sets the type of button to render in the
        ///       column.
        ///  
        [
        WebCategory("Appearance"), 
        DefaultValue(ButtonColumnType.LinkButton), 
        WebSysDescriptionAttribute(SR.ButtonColumn_ButtonType)
        ] 
        public virtual ButtonColumnType ButtonType {
            get {
                object o = ViewState["ButtonType"];
                if (o != null) 
                    return(ButtonColumnType)o;
                return ButtonColumnType.LinkButton; 
            } 
            set {
                if (value < ButtonColumnType.LinkButton || value > ButtonColumnType.PushButton) { 
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["ButtonType"] = value;
                OnColumnChanged(); 
            }
        } 
 

        [ 
        DefaultValue(false),
        WebSysDescriptionAttribute(SR.ButtonColumn_CausesValidation)
        ]
        public virtual bool CausesValidation { 
            get {
                object o = ViewState["CausesValidation"]; 
                if (o != null) { 
                    return (bool)o;
                } 
                return false;
            }
            set {
                ViewState["CausesValidation"] = value; 
                OnColumnChanged();
            } 
        } 

 
        /// 
        /// Gets or sets the command to perform when this 
        /// is clicked.
        ///  
        [
        WebCategory("Behavior"), 
        DefaultValue(""), 
        WebSysDescriptionAttribute(SR.WebControl_CommandName)
        ] 
        public virtual string CommandName {
            get {
                object o = ViewState["CommandName"];
                if (o != null) 
                    return(string)o;
                return string.Empty; 
            } 
            set {
                ViewState["CommandName"] = value; 
                OnColumnChanged();
            }
        }
 

        ///  
        ///    Gets or sets the field name from the data model that is 
        ///       bound to the  property of the button in this column.
        ///  
        [
        WebCategory("Data"),
        DefaultValue(""),
        WebSysDescriptionAttribute(SR.ButtonColumn_DataTextField) 
        ]
        public virtual string DataTextField { 
            get { 
                object o = ViewState["DataTextField"];
                if (o != null) 
                    return(string)o;
                return String.Empty;
            }
            set { 
                ViewState["DataTextField"] = value;
                OnColumnChanged(); 
            } 
        }
 

        /// 
        ///    Gets or sets the string used to format the data bound to
        ///       the  property of the button. 
        /// 
        [ 
        WebCategory("Data"), 
        DefaultValue(""),
        WebSysDescriptionAttribute(SR.ButtonColumn_DataTextFormatString) 
        ]
        public virtual string DataTextFormatString {
            get {
                object o = ViewState["DataTextFormatString"]; 
                if (o != null)
                    return(string)o; 
                return String.Empty; 
            }
            set { 
                ViewState["DataTextFormatString"] = value;
                OnColumnChanged();
            }
        } 

 
        ///  
        /// Gets or sets the caption text displayed on the 
        /// in this column. 
        /// 
        [
        Localizable(true),
        WebCategory("Appearance"), 
        DefaultValue(""),
        WebSysDescriptionAttribute(SR.ButtonColumn_Text) 
        ] 
        public virtual string Text {
            get { 
                object o = ViewState["Text"];
                if (o != null)
                    return(string)o;
                return String.Empty; 
            }
            set { 
                ViewState["Text"] = value; 
                OnColumnChanged();
            } 
        }


        [ 
        DefaultValue(""),
        WebSysDescriptionAttribute(SR.ButtonColumn_ValidationGroup) 
        ] 
        public virtual string ValidationGroup {
            get { 
                object o = ViewState["ValidationGroup"];
                if (o != null) {
                    return (string)o;
                } 
                return String.Empty;
            } 
            set { 
                ViewState["ValidationGroup"] = value;
                OnColumnChanged(); 
            }
        }

 

        ///  
        ///  
        protected virtual string FormatDataTextValue(object dataTextValue) {
            string formattedTextValue = String.Empty; 

            if (!DataBinder.IsNull(dataTextValue)) {
                string formatting = DataTextFormatString;
                if (formatting.Length == 0) { 
                    formattedTextValue = dataTextValue.ToString();
                } 
                else { 
                    formattedTextValue = String.Format(CultureInfo.CurrentCulture, formatting, dataTextValue);
                } 
            }

            return formattedTextValue;
        } 

 
        ///  
        /// 
        public override void Initialize() { 
            base.Initialize();
            textFieldDesc = null;
        }
 

        ///  
        /// Initializes a cell in the  . 
        /// 
        public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) { 
            base.InitializeCell(cell, columnIndex, itemType);

            if ((itemType != ListItemType.Header) &&
                (itemType != ListItemType.Footer)) { 
                WebControl buttonControl = null;
 
                if (ButtonType == ButtonColumnType.LinkButton) { 
                    LinkButton button = new DataGridLinkButton();
 
                    button.Text = Text;
                    button.CommandName = CommandName;
                    button.CausesValidation = CausesValidation;
                    button.ValidationGroup = ValidationGroup; 
                    buttonControl = button;
                } 
                else { 
                    Button button = new Button();
 
                    button.Text = Text;
                    button.CommandName = CommandName;
                    button.CausesValidation = CausesValidation;
                    button.ValidationGroup = ValidationGroup; 
                    buttonControl = button;
                } 
 
                if (DataTextField.Length != 0) {
                    buttonControl.DataBinding += new EventHandler(this.OnDataBindColumn); 
                }

                cell.Controls.Add(buttonControl);
            } 
        }
 
 
        /// 
        ///  
        private void OnDataBindColumn(object sender, EventArgs e) {
            Debug.Assert(DataTextField.Length != 0, "Shouldn't be DataBinding without a DataTextField");

            Control boundControl = (Control)sender; 
            DataGridItem item = (DataGridItem)boundControl.NamingContainer;
            object dataItem = item.DataItem; 
 
            if (textFieldDesc == null) {
                string dataField = DataTextField; 

                textFieldDesc = TypeDescriptor.GetProperties(dataItem).Find(dataField, true);
                if ((textFieldDesc == null) && !DesignMode) {
                    throw new HttpException(SR.GetString(SR.Field_Not_Found, dataField)); 
                }
            } 
 
            string dataValue;
 
            if (textFieldDesc != null) {
                object data = textFieldDesc.GetValue(dataItem);
                dataValue = FormatDataTextValue(data);
            } 
            else {
                Debug.Assert(DesignMode == true); 
                dataValue = SR.GetString(SR.Sample_Databound_Text); 
            }
 
            if (boundControl is LinkButton) {
                ((LinkButton)boundControl).Text = dataValue;
            }
            else { 
                Debug.Assert(boundControl is Button, "Expected the bound control to be a Button");
                ((Button)boundControl).Text = dataValue; 
            } 
        }
    } 
}

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK