Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / DEVDIV / depot / DevDiv / releases / whidbey / QFE / ndp / fx / src / xsp / System / Web / UI / WebControls / ImageField.cs / 2 / ImageField.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing.Design;
using System.Globalization;
using System.IO;
using System.Security.Permissions;
using System.Web.Util;
///
/// Creates a field bounded to a data field in a
///
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public class ImageField : DataControlField {
///
/// Specifies a string that represents "this". This field is read-only.
///
public static readonly string ThisExpression = "!";
private PropertyDescriptor _imageFieldDesc;
private PropertyDescriptor _altTextFieldDesc;
string _dataField;
///
/// Initializes a new instance of a
///
public ImageField() {
}
[
Localizable(true),
WebCategory("Appearance"),
DefaultValue(""),
WebSysDescription(SR.ImageField_AlternateText)
]
public virtual string AlternateText {
get {
object o = ViewState["AlternateText"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["AlternateText"])) {
ViewState["AlternateText"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that determines whether the field treats empty string as
/// null when the field values are extracted.
///
[
WebCategory("Behavior"),
DefaultValue(true),
WebSysDescription(SR.ImageField_ConvertEmptyStringToNull)
]
public virtual bool ConvertEmptyStringToNull {
get {
object o = ViewState["ConvertEmptyStringToNull"];
if (o != null) {
return (bool)o;
}
return true;
}
set {
ViewState["ConvertEmptyStringToNull"] = value;
}
}
[
WebCategory("Data"),
DefaultValue(""),
TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign),
WebSysDescription(SR.ImageField_DataAlternateTextField)
]
public virtual string DataAlternateTextField {
get {
object o = ViewState["DataAlternateTextField"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataAlternateTextField"])) {
ViewState["DataAlternateTextField"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the display format of alternate text in this
/// field.
///
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.ImageField_DataAlternateTextFormatString)
]
public virtual string DataAlternateTextFormatString {
get {
object o = ViewState["DataAlternateTextFormatString"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataAlternateTextFormatString"])) {
ViewState["DataAlternateTextFormatString"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the field name from the data model bound to this field.
///
[
WebCategory("Data"),
DefaultValue(""),
TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign),
WebSysDescription(SR.ImageField_ImageUrlField)
]
public virtual string DataImageUrlField {
get {
if (_dataField == null) {
object o = ViewState["DataImageUrlField"];
if (o != null)
_dataField = (string)o;
else
_dataField = String.Empty;
}
return _dataField;
}
set {
if (!String.Equals(value, ViewState["DataImageUrlField"])) {
ViewState["DataImageUrlField"] = value;
_dataField = value;
OnFieldChanged();
}
}
}
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.ImageField_ImageUrlFormatString)
]
public virtual string DataImageUrlFormatString {
get {
object o = ViewState["DataImageUrlFormatString"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataImageUrlFormatString"])) {
ViewState["DataImageUrlFormatString"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that determines what text is displayed if the value
/// of the field is null.
///
[
Localizable(true),
WebCategory("Behavior"),
DefaultValue(""),
WebSysDescription(SR.BoundField_NullDisplayText)
]
public virtual string NullDisplayText {
get {
object o = ViewState["NullDisplayText"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["NullDisplayText"])) {
ViewState["NullDisplayText"] = value;
OnFieldChanged();
}
}
}
[
WebCategory("Behavior"),
DefaultValue(""),
Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
UrlProperty(),
WebSysDescription(SR.ImageField_NullImageUrl)
]
public virtual string NullImageUrl {
get {
object o = ViewState["NullImageUrl"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["NullImageUrl"])) {
ViewState["NullImageUrl"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that prevents modification to data
/// in this field.
///
[
WebCategory("Behavior"),
DefaultValue(false),
WebSysDescription(SR.ImageField_ReadOnly)
]
public virtual bool ReadOnly {
get {
object o = ViewState["ReadOnly"];
if (o != null)
return (bool)o;
return false;
}
set {
object oldValue = ViewState["ReadOnly"];
if (oldValue == null || (bool)oldValue != value) {
ViewState["ReadOnly"] = value;
OnFieldChanged();
}
}
}
protected override void CopyProperties(DataControlField newField) {
((ImageField)newField).AlternateText = AlternateText;
((ImageField)newField).ConvertEmptyStringToNull = ConvertEmptyStringToNull;
((ImageField)newField).DataAlternateTextField = DataAlternateTextField;
((ImageField)newField).DataAlternateTextFormatString = DataAlternateTextFormatString;
((ImageField)newField).DataImageUrlField = DataImageUrlField;
((ImageField)newField).DataImageUrlFormatString = DataImageUrlFormatString;
((ImageField)newField).NullDisplayText = NullDisplayText;
((ImageField)newField).NullImageUrl = NullImageUrl;
((ImageField)newField).ReadOnly = ReadOnly;
base.CopyProperties(newField);
}
protected override DataControlField CreateField() {
return new ImageField();
}
///
/// Extracts the value(s) from the given cell and puts the value(s) into a dictionary. Indicate includeReadOnly
/// to have readonly fields' values inserted into the dictionary.
///
public override void ExtractValuesFromCell(IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly) {
Control childControl = null;
string dataField = DataImageUrlField;
object value = null;
bool includeNullValue = false;
if (((rowState & DataControlRowState.Insert) != 0) && !InsertVisible) {
return;
}
if (cell.Controls.Count == 0) { // this should happen only in design mode
Debug.Assert(DesignMode, "Unless you're in designmode, there should be a control in the cell.");
return;
}
childControl = cell.Controls[0];
Image image = childControl as Image;
if (image != null) {
if (includeReadOnly) {
includeNullValue = true;
if (image.Visible) {
value = image.ImageUrl;
}
}
}
else {
TextBox editBox = childControl as TextBox;
if (editBox != null) {
value = editBox.Text;
includeNullValue = true; // just in case someone wrote a derived textbox that returns null for Text.
}
}
if (value != null || includeNullValue) {
if (ConvertEmptyStringToNull && value is string && ((string)value).Length == 0) {
value = null;
}
if (dictionary.Contains(dataField)) {
dictionary[dataField] = value;
}
else {
dictionary.Add(dataField, value);
}
}
}
///
/// Returns the formatted value of the image url
///
protected virtual string FormatImageUrlValue(object dataValue) {
string formattedValue = String.Empty;
string formatting = DataImageUrlFormatString;
if (!DataBinder.IsNull(dataValue)) {
string dataValueString = dataValue.ToString();
if (dataValueString.Length > 0) {
if (formatting.Length == 0) {
formattedValue = dataValueString;
}
else {
formattedValue = String.Format(CultureInfo.CurrentCulture, formatting, dataValue);
}
}
}
else {
return null;
}
return formattedValue;
}
///
/// Returns the alternate text to be used for accessibility
///
protected virtual string GetFormattedAlternateText(Control controlContainer) {
string altTextField = DataAlternateTextField;
string altTextFormatString = DataAlternateTextFormatString;
string formattedAlternateText;
if (altTextField.Length > 0) {
object value = GetValue(controlContainer, altTextField, ref _altTextFieldDesc);
string strValue = String.Empty;
if (!DataBinder.IsNull(value)) {
strValue = value.ToString();
}
if (altTextFormatString.Length > 0) {
formattedAlternateText = String.Format(CultureInfo.CurrentCulture, altTextFormatString, value);
}
else {
formattedAlternateText = strValue;
}
}
else {
formattedAlternateText = AlternateText;
}
return formattedAlternateText;
}
///
/// Returns a value to be used for design-time rendering
///
protected virtual string GetDesignTimeValue() {
return SR.GetString(SR.Sample_Databound_Text);
}
///
/// Retrieves the value of the field to be databound to the ImageField.
///
protected virtual object GetValue(Control controlContainer, string fieldName, ref PropertyDescriptor cachedDescriptor) {
Debug.Assert(DataImageUrlField.Length != 0, "Shouldn't be DataBinding without an DataImageUrlField");
object data = null;
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));
}
// Get value of field in data item
if (cachedDescriptor == null) {
if (!fieldName.Equals(ThisExpression)) {
cachedDescriptor = TypeDescriptor.GetProperties(dataItem).Find(fieldName, true);
if ((cachedDescriptor == null) && !DesignMode) {
throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
}
}
}
if (cachedDescriptor != null && dataItem != null) {
data = cachedDescriptor.GetValue(dataItem);
}
else {
if (!DesignMode) {
data = dataItem;
}
}
return data;
}
///
/// Initializes the field and resets member variables.
///
public override bool Initialize(bool enableSorting, Control control) {
base.Initialize(enableSorting, control);
_imageFieldDesc = null;
_altTextFieldDesc = null;
return false;
}
///
/// Initializes a cell in the DataControlField.
///
public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex) {
base.InitializeCell(cell, cellType, rowState, rowIndex);
switch (cellType) {
case DataControlCellType.DataCell:
InitializeDataCell(cell, rowState);
break;
}
}
protected virtual void InitializeDataCell(DataControlFieldCell cell, DataControlRowState rowState) {
Control boundControl = null;
if (((rowState & DataControlRowState.Edit) != 0 && ReadOnly == false) || (rowState & DataControlRowState.Insert) != 0) {
TextBox editor = new TextBox();
cell.Controls.Add(editor);
if (DataImageUrlField.Length != 0 && (rowState & DataControlRowState.Edit) != 0) {
boundControl = editor;
}
}
else if (DataImageUrlField.Length != 0) {
boundControl = cell;
Image image = new Image();
Label label = new Label();
cell.Controls.Add(image);
cell.Controls.Add(label);
}
if (boundControl != null && Visible) {
boundControl.DataBinding += new EventHandler(this.OnDataBindField);
}
}
///
/// Handles databinding the field and its controls.
///
protected virtual void OnDataBindField(object sender, EventArgs e) {
Control boundControl = (Control)sender;
Control controlContainer = boundControl.NamingContainer;
string urlValue = null;
string nullImageUrl = NullImageUrl;
string altText = GetFormattedAlternateText(controlContainer);
if (DesignMode && (boundControl is TableCell)) {
if (boundControl.Controls.Count == 0 || !(boundControl.Controls[0] is Image)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
((Image)boundControl.Controls[0]).Visible = false;
((TableCell)boundControl).Text = GetDesignTimeValue();
return;
}
object data = GetValue(controlContainer, DataImageUrlField, ref _imageFieldDesc);
urlValue = FormatImageUrlValue(data);
if (boundControl is TableCell) { // read-only
TableCell cell = (TableCell)boundControl;
if (cell.Controls.Count < 2 || !(cell.Controls[0] is Image) || !(cell.Controls[1] is Label)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
Image image = (Image)cell.Controls[0];
Label label = (Label)cell.Controls[1];
label.Visible = false;
if (urlValue == null || (ConvertEmptyStringToNull && urlValue.Length == 0)) {
if (nullImageUrl.Length > 0) {
urlValue = nullImageUrl;
}
else {
image.Visible = false;
label.Text = NullDisplayText;
label.Visible = true;
}
}
if (!CrossSiteScriptingValidation.IsDangerousUrl(urlValue)) {
image.ImageUrl = urlValue;
}
image.AlternateText = altText;
}
else { // edit/insert
if (!(boundControl is TextBox)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
((TextBox)boundControl).Text = data.ToString();
((TextBox)boundControl).ToolTip = altText;
if (data != null) {
// size down the textbox for certain types
if (data.GetType().IsPrimitive) {
((TextBox)boundControl).Columns = 5;
}
}
}
}
///
/// 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.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing.Design;
using System.Globalization;
using System.IO;
using System.Security.Permissions;
using System.Web.Util;
///
/// Creates a field bounded to a data field in a
///
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public class ImageField : DataControlField {
///
/// Specifies a string that represents "this". This field is read-only.
///
public static readonly string ThisExpression = "!";
private PropertyDescriptor _imageFieldDesc;
private PropertyDescriptor _altTextFieldDesc;
string _dataField;
///
/// Initializes a new instance of a
///
public ImageField() {
}
[
Localizable(true),
WebCategory("Appearance"),
DefaultValue(""),
WebSysDescription(SR.ImageField_AlternateText)
]
public virtual string AlternateText {
get {
object o = ViewState["AlternateText"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["AlternateText"])) {
ViewState["AlternateText"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that determines whether the field treats empty string as
/// null when the field values are extracted.
///
[
WebCategory("Behavior"),
DefaultValue(true),
WebSysDescription(SR.ImageField_ConvertEmptyStringToNull)
]
public virtual bool ConvertEmptyStringToNull {
get {
object o = ViewState["ConvertEmptyStringToNull"];
if (o != null) {
return (bool)o;
}
return true;
}
set {
ViewState["ConvertEmptyStringToNull"] = value;
}
}
[
WebCategory("Data"),
DefaultValue(""),
TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign),
WebSysDescription(SR.ImageField_DataAlternateTextField)
]
public virtual string DataAlternateTextField {
get {
object o = ViewState["DataAlternateTextField"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataAlternateTextField"])) {
ViewState["DataAlternateTextField"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the display format of alternate text in this
/// field.
///
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.ImageField_DataAlternateTextFormatString)
]
public virtual string DataAlternateTextFormatString {
get {
object o = ViewState["DataAlternateTextFormatString"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataAlternateTextFormatString"])) {
ViewState["DataAlternateTextFormatString"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the field name from the data model bound to this field.
///
[
WebCategory("Data"),
DefaultValue(""),
TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign),
WebSysDescription(SR.ImageField_ImageUrlField)
]
public virtual string DataImageUrlField {
get {
if (_dataField == null) {
object o = ViewState["DataImageUrlField"];
if (o != null)
_dataField = (string)o;
else
_dataField = String.Empty;
}
return _dataField;
}
set {
if (!String.Equals(value, ViewState["DataImageUrlField"])) {
ViewState["DataImageUrlField"] = value;
_dataField = value;
OnFieldChanged();
}
}
}
[
WebCategory("Data"),
DefaultValue(""),
WebSysDescription(SR.ImageField_ImageUrlFormatString)
]
public virtual string DataImageUrlFormatString {
get {
object o = ViewState["DataImageUrlFormatString"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["DataImageUrlFormatString"])) {
ViewState["DataImageUrlFormatString"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that determines what text is displayed if the value
/// of the field is null.
///
[
Localizable(true),
WebCategory("Behavior"),
DefaultValue(""),
WebSysDescription(SR.BoundField_NullDisplayText)
]
public virtual string NullDisplayText {
get {
object o = ViewState["NullDisplayText"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["NullDisplayText"])) {
ViewState["NullDisplayText"] = value;
OnFieldChanged();
}
}
}
[
WebCategory("Behavior"),
DefaultValue(""),
Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
UrlProperty(),
WebSysDescription(SR.ImageField_NullImageUrl)
]
public virtual string NullImageUrl {
get {
object o = ViewState["NullImageUrl"];
if (o != null) {
return (string)o;
}
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["NullImageUrl"])) {
ViewState["NullImageUrl"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the property that prevents modification to data
/// in this field.
///
[
WebCategory("Behavior"),
DefaultValue(false),
WebSysDescription(SR.ImageField_ReadOnly)
]
public virtual bool ReadOnly {
get {
object o = ViewState["ReadOnly"];
if (o != null)
return (bool)o;
return false;
}
set {
object oldValue = ViewState["ReadOnly"];
if (oldValue == null || (bool)oldValue != value) {
ViewState["ReadOnly"] = value;
OnFieldChanged();
}
}
}
protected override void CopyProperties(DataControlField newField) {
((ImageField)newField).AlternateText = AlternateText;
((ImageField)newField).ConvertEmptyStringToNull = ConvertEmptyStringToNull;
((ImageField)newField).DataAlternateTextField = DataAlternateTextField;
((ImageField)newField).DataAlternateTextFormatString = DataAlternateTextFormatString;
((ImageField)newField).DataImageUrlField = DataImageUrlField;
((ImageField)newField).DataImageUrlFormatString = DataImageUrlFormatString;
((ImageField)newField).NullDisplayText = NullDisplayText;
((ImageField)newField).NullImageUrl = NullImageUrl;
((ImageField)newField).ReadOnly = ReadOnly;
base.CopyProperties(newField);
}
protected override DataControlField CreateField() {
return new ImageField();
}
///
/// Extracts the value(s) from the given cell and puts the value(s) into a dictionary. Indicate includeReadOnly
/// to have readonly fields' values inserted into the dictionary.
///
public override void ExtractValuesFromCell(IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly) {
Control childControl = null;
string dataField = DataImageUrlField;
object value = null;
bool includeNullValue = false;
if (((rowState & DataControlRowState.Insert) != 0) && !InsertVisible) {
return;
}
if (cell.Controls.Count == 0) { // this should happen only in design mode
Debug.Assert(DesignMode, "Unless you're in designmode, there should be a control in the cell.");
return;
}
childControl = cell.Controls[0];
Image image = childControl as Image;
if (image != null) {
if (includeReadOnly) {
includeNullValue = true;
if (image.Visible) {
value = image.ImageUrl;
}
}
}
else {
TextBox editBox = childControl as TextBox;
if (editBox != null) {
value = editBox.Text;
includeNullValue = true; // just in case someone wrote a derived textbox that returns null for Text.
}
}
if (value != null || includeNullValue) {
if (ConvertEmptyStringToNull && value is string && ((string)value).Length == 0) {
value = null;
}
if (dictionary.Contains(dataField)) {
dictionary[dataField] = value;
}
else {
dictionary.Add(dataField, value);
}
}
}
///
/// Returns the formatted value of the image url
///
protected virtual string FormatImageUrlValue(object dataValue) {
string formattedValue = String.Empty;
string formatting = DataImageUrlFormatString;
if (!DataBinder.IsNull(dataValue)) {
string dataValueString = dataValue.ToString();
if (dataValueString.Length > 0) {
if (formatting.Length == 0) {
formattedValue = dataValueString;
}
else {
formattedValue = String.Format(CultureInfo.CurrentCulture, formatting, dataValue);
}
}
}
else {
return null;
}
return formattedValue;
}
///
/// Returns the alternate text to be used for accessibility
///
protected virtual string GetFormattedAlternateText(Control controlContainer) {
string altTextField = DataAlternateTextField;
string altTextFormatString = DataAlternateTextFormatString;
string formattedAlternateText;
if (altTextField.Length > 0) {
object value = GetValue(controlContainer, altTextField, ref _altTextFieldDesc);
string strValue = String.Empty;
if (!DataBinder.IsNull(value)) {
strValue = value.ToString();
}
if (altTextFormatString.Length > 0) {
formattedAlternateText = String.Format(CultureInfo.CurrentCulture, altTextFormatString, value);
}
else {
formattedAlternateText = strValue;
}
}
else {
formattedAlternateText = AlternateText;
}
return formattedAlternateText;
}
///
/// Returns a value to be used for design-time rendering
///
protected virtual string GetDesignTimeValue() {
return SR.GetString(SR.Sample_Databound_Text);
}
///
/// Retrieves the value of the field to be databound to the ImageField.
///
protected virtual object GetValue(Control controlContainer, string fieldName, ref PropertyDescriptor cachedDescriptor) {
Debug.Assert(DataImageUrlField.Length != 0, "Shouldn't be DataBinding without an DataImageUrlField");
object data = null;
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));
}
// Get value of field in data item
if (cachedDescriptor == null) {
if (!fieldName.Equals(ThisExpression)) {
cachedDescriptor = TypeDescriptor.GetProperties(dataItem).Find(fieldName, true);
if ((cachedDescriptor == null) && !DesignMode) {
throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
}
}
}
if (cachedDescriptor != null && dataItem != null) {
data = cachedDescriptor.GetValue(dataItem);
}
else {
if (!DesignMode) {
data = dataItem;
}
}
return data;
}
///
/// Initializes the field and resets member variables.
///
public override bool Initialize(bool enableSorting, Control control) {
base.Initialize(enableSorting, control);
_imageFieldDesc = null;
_altTextFieldDesc = null;
return false;
}
///
/// Initializes a cell in the DataControlField.
///
public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex) {
base.InitializeCell(cell, cellType, rowState, rowIndex);
switch (cellType) {
case DataControlCellType.DataCell:
InitializeDataCell(cell, rowState);
break;
}
}
protected virtual void InitializeDataCell(DataControlFieldCell cell, DataControlRowState rowState) {
Control boundControl = null;
if (((rowState & DataControlRowState.Edit) != 0 && ReadOnly == false) || (rowState & DataControlRowState.Insert) != 0) {
TextBox editor = new TextBox();
cell.Controls.Add(editor);
if (DataImageUrlField.Length != 0 && (rowState & DataControlRowState.Edit) != 0) {
boundControl = editor;
}
}
else if (DataImageUrlField.Length != 0) {
boundControl = cell;
Image image = new Image();
Label label = new Label();
cell.Controls.Add(image);
cell.Controls.Add(label);
}
if (boundControl != null && Visible) {
boundControl.DataBinding += new EventHandler(this.OnDataBindField);
}
}
///
/// Handles databinding the field and its controls.
///
protected virtual void OnDataBindField(object sender, EventArgs e) {
Control boundControl = (Control)sender;
Control controlContainer = boundControl.NamingContainer;
string urlValue = null;
string nullImageUrl = NullImageUrl;
string altText = GetFormattedAlternateText(controlContainer);
if (DesignMode && (boundControl is TableCell)) {
if (boundControl.Controls.Count == 0 || !(boundControl.Controls[0] is Image)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
((Image)boundControl.Controls[0]).Visible = false;
((TableCell)boundControl).Text = GetDesignTimeValue();
return;
}
object data = GetValue(controlContainer, DataImageUrlField, ref _imageFieldDesc);
urlValue = FormatImageUrlValue(data);
if (boundControl is TableCell) { // read-only
TableCell cell = (TableCell)boundControl;
if (cell.Controls.Count < 2 || !(cell.Controls[0] is Image) || !(cell.Controls[1] is Label)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
Image image = (Image)cell.Controls[0];
Label label = (Label)cell.Controls[1];
label.Visible = false;
if (urlValue == null || (ConvertEmptyStringToNull && urlValue.Length == 0)) {
if (nullImageUrl.Length > 0) {
urlValue = nullImageUrl;
}
else {
image.Visible = false;
label.Text = NullDisplayText;
label.Visible = true;
}
}
if (!CrossSiteScriptingValidation.IsDangerousUrl(urlValue)) {
image.ImageUrl = urlValue;
}
image.AlternateText = altText;
}
else { // edit/insert
if (!(boundControl is TextBox)) {
throw new HttpException(SR.GetString(SR.ImageField_WrongControlType, DataImageUrlField));
}
((TextBox)boundControl).Text = data.ToString();
((TextBox)boundControl).ToolTip = altText;
if (data != null) {
// size down the textbox for certain types
if (data.GetType().IsPrimitive) {
((TextBox)boundControl).Columns = 5;
}
}
}
}
///
/// 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.
// Copyright (c) Microsoft Corporation. All rights reserved.
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