ButtonField.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ButtonField.cs / 1 / ButtonField.cs
                        

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Drawing.Design;
    using System.Globalization;
    using System.Security.Permissions; 
    using System.Web.Util;
 
 
    /// 
    /// Creates a field with a set of  
    /// controls.
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class ButtonField : ButtonFieldBase {
 
        private PropertyDescriptor textFieldDesc; 

 
        /// 
        /// Initializes a new instance of the  class.
        /// 
        public ButtonField() { 
        }
 
 
        /// 
        /// 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 { 
                if (!String.Equals(value, ViewState["CommandName"])) { 
                    ViewState["CommandName"] = value;
                    OnFieldChanged(); 
                }
            }
        }
 

        ///  
        ///    Gets or sets the field name from the data model that is 
        ///       bound to the  property of the button in this field.
        ///  
        [
        WebCategory("Data"),
        DefaultValue(""),
        WebSysDescriptionAttribute(SR.ButtonField_DataTextField), 
        TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign)
        ] 
        public virtual string DataTextField { 
            get {
                object o = ViewState["DataTextField"]; 
                if (o != null)
                    return(string)o;
                return String.Empty;
            } 
            set {
                if (!String.Equals(value, ViewState["DataTextField"])) { 
                    ViewState["DataTextField"] = value; 
                    OnFieldChanged();
                } 
            }
        }

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


        [
        WebCategory("Appearance"), 
        DefaultValue(""),
        Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        WebSysDescriptionAttribute(SR.ButtonField_ImageUrl), 
        UrlProperty()
        ] 
        public virtual string ImageUrl {
            get {
                object o = ViewState["ImageUrl"];
                if (o != null) { 
                    return (string)o;
                } 
                return String.Empty; 
            }
            set { 
                if (!String.Equals(value, ViewState["ImageUrl"])) {
                    ViewState["ImageUrl"] = value;
                    OnFieldChanged();
                } 
            }
        } 
 

        ///  
        /// Gets or sets the caption text displayed on the 
        /// in this field.
        /// 
        [ 
        Localizable(true),
        WebCategory("Appearance"), 
        DefaultValue(""), 
        WebSysDescriptionAttribute(SR.ButtonField_Text)
        ] 
        public virtual string Text {
            get {
                object o = ViewState["Text"];
                if (o != null) 
                    return(string)o;
                return String.Empty; 
            } 
            set {
                if (!String.Equals(value, ViewState["Text"])) { 
                    ViewState["Text"] = value;
                    OnFieldChanged();
                }
            } 
        }
 
        protected override void CopyProperties(DataControlField newField) { 
            ((ButtonField)newField).CommandName = CommandName;
            ((ButtonField)newField).DataTextField = DataTextField; 
            ((ButtonField)newField).DataTextFormatString = DataTextFormatString;
            ((ButtonField)newField).ImageUrl = ImageUrl;
            ((ButtonField)newField).Text = Text;
            base.CopyProperties(newField); 
        }
 
        protected override DataControlField CreateField() { 
            return new ButtonField();
        } 


        /// 
        ///  
        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 bool Initialize(bool sortingEnabled, Control control) { 
            base.Initialize(sortingEnabled, control); 
            textFieldDesc = null;
            return false; 
        }


        ///  
        /// Initializes a cell in the  .
        ///  
        public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex) { 
            base.InitializeCell(cell, cellType, rowState, rowIndex);
 
            if ((cellType != DataControlCellType.Header) &&
                (cellType != DataControlCellType.Footer)) {
                IButtonControl button;
                IPostBackContainer container = Control as IPostBackContainer; 
                bool causesValidation = CausesValidation;
                bool setCausesValidation = true;    // the setter on the DataControlButtons throw if there's a container for security 
 
                switch(ButtonType) {
                    case ButtonType.Link: { 
                        if (container != null && !causesValidation) {
                            button = new DataControlLinkButton(container);
                            setCausesValidation = false;
                        } 
                        else {
                            // use DataControlLinkButton because it uses the right forecolor 
                            button = new DataControlLinkButton(null); 
                        }
                        break; 
                    }
                    case ButtonType.Button: {
                        if (container != null && !causesValidation) {
                            button = new DataControlButton(container); 
                            setCausesValidation = false;
                        } 
                        else { 
                            button = new Button();
                        } 
                        break;
                    }
                    case ButtonType.Image:
                    default: { 
                        if (container != null && !causesValidation) {
                            button = new DataControlImageButton(container); 
                            setCausesValidation = false; 
                        }
                        else { 
                            button = new ImageButton();
                        }

                        ((ImageButton)button).ImageUrl = ImageUrl; 
                        break;
                    } 
                } 

                button.Text = Text; 
                button.CommandName = CommandName;
                button.CommandArgument = rowIndex.ToString(CultureInfo.InvariantCulture);
                if (setCausesValidation) {
                    button.CausesValidation = causesValidation; 
                }
                button.ValidationGroup = ValidationGroup; 
 
                if (DataTextField.Length != 0 && Visible) {
                    ((WebControl)button).DataBinding += new EventHandler(this.OnDataBindField); 
                }

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

            Control boundControl = (Control)sender; 
            Control controlContainer = boundControl.NamingContainer;
            string dataValue; 
            object dataItem = null; 

            if (controlContainer == null) { 
                throw new HttpException(SR.GetString(SR.DataControlField_NoContainer));
            }

            // Get the DataItem from the container 
            dataItem = DataBinder.GetDataItem(controlContainer);
 
            if (dataItem == null && !DesignMode) { 
                throw new HttpException(SR.GetString(SR.DataItem_Not_Found));
            } 

           if (textFieldDesc == null && dataItem != 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)); 
                }
            } 

            if (textFieldDesc != null && dataItem != null) {
                object data = textFieldDesc.GetValue(dataItem);
                dataValue = FormatDataTextValue(data); 
            }
            else { 
                Debug.Assert(DesignMode == true); 
                dataValue = SR.GetString(SR.Sample_Databound_Text);
            } 

            Debug.Assert(boundControl is IButtonControl, "Expected the bound control to be an IButtonControl");
            ((IButtonControl)boundControl).Text = dataValue;
        } 

        ///  
        /// Override with an empty body if the field's controls all support callback. 
        ///  Otherwise, override and throw a useful error message about why the field can't support callbacks.
        ///  
        public override void ValidateSupportsCallback() {
        }
    }
}

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