ButtonField.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / ButtonField.cs / 1305376 / 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.Web.Util; 

 
    ///  
    /// Creates a field with a set of 
    /// controls. 
    /// 
    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() { 
        }
    } 
}


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

Source code for the .NET framework in C#

Code:

Link Menu
