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; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class ButtonField : ButtonFieldBase { private PropertyDescriptor textFieldDesc; ///Creates a field with a set of ////// controls. /// public ButtonField() { } ///Initializes a new instance of the ///class. /// [ 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 command to perform when this ////// is clicked. /// [ 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 field name from the data model that is /// bound to the ///property of the button in this field. /// [ 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 string used to format the data bound to /// the ///property of the button. /// [ 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(); } ///Gets or sets the caption text displayed on the ////// in this field. /// 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; } ////// 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); } } ///Initializes a cell in the ///. /// 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; } ////// public override void ValidateSupportsCallback() { } } }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. ///
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