AutoGeneratedField.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / UI / WebControls / AutoGeneratedField.cs / 2 / AutoGeneratedField.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.Security.Permissions;
 

    ///  
    /// Creates a field bounded to a data field in a . 
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [EditorBrowsable(EditorBrowsableState.Never)]
    public sealed class AutoGeneratedField : BoundField {

        private bool _suppressPropertyThrows = false; 
        private bool _useCheckBox;
        private bool _useCheckBoxValid; 
 

        ///  
        /// Initializes a new instance of a  class.
        /// 
        public AutoGeneratedField(string dataField) {
            DataField = dataField; 
        }
 
 
        /// 
        /// Gets or sets the display format of data in this 
        /// field.
        /// 
        public override string DataFormatString {
            get { 
                return base.DataFormatString;
            } 
            set { 
                if (!_suppressPropertyThrows) {
                    throw new NotSupportedException(); 
                }
            }
        }
 

        ///  
        /// Gets or sets the type of data being displayed by the field. 
        /// 
        public Type DataType { 
            get {
                object o = ViewState["DataType"];
                if (o != null) {
                    return (Type)o; 
                }
                return typeof(string); 
            } 
            set {
                ViewState["DataType"] = value; 
            }
        }

 
        /// 
        /// Gets or sets whether the field is visible in Insert mode.  Turn off for auto-gen'd db fields 
        ///  
        public override bool InsertVisible {
            get { 
                return base.InsertVisible;
            }
            set {
                if (!_suppressPropertyThrows) { 
                    throw new NotSupportedException();
                } 
            } 
        }
 


        /// 
        /// Gets or sets the property that determines whether the BoundField treats empty string as 
        /// null when the field values are extracted.
        ///  
        public override bool ConvertEmptyStringToNull { 
            get {
                return base.ConvertEmptyStringToNull; 
            }
            set {
                if (!_suppressPropertyThrows) {
                    throw new NotSupportedException(); 
                }
            } 
        } 

        ///  
        ///    Determines whether the field should display a text box.
        /// 
        private bool UseCheckBox {
            get { 
                if (!_useCheckBoxValid) {
                    _useCheckBox = (DataType == typeof(bool) || DataType == typeof(bool?)); 
                    _useCheckBoxValid = true; 
                }
                return _useCheckBox; 
            }
        }

        protected override void CopyProperties(DataControlField newField) { 
            ((AutoGeneratedField)newField).DataType = DataType;
            _suppressPropertyThrows = true; 
            ((AutoGeneratedField)newField)._suppressPropertyThrows = true; 
            base.CopyProperties(newField);
            _suppressPropertyThrows = false; 
            ((AutoGeneratedField)newField)._suppressPropertyThrows = false;
        }

        protected override DataControlField CreateField() { 
            return new AutoGeneratedField(DataField);
        } 
 

        ///  
        /// Returns a value to be used for design-time rendering
        /// 
        protected override object GetDesignTimeValue() {
            if (UseCheckBox) { 
                return true;
            } 
            return base.GetDesignTimeValue(); 
        }
 

        /// 
        /// Extracts the value of the databound cell and inserts the value into the given dictionary
        ///  
        public override void ExtractValuesFromCell(IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly) {
            if (UseCheckBox) { 
                Control childControl = null; 
                string dataField = DataField;
                object value = null; 

                if (cell.Controls.Count > 0) {
                    childControl = cell.Controls[0];
 
                    CheckBox checkBox = childControl as CheckBox;
                    if (checkBox != null) { 
                        if (includeReadOnly || checkBox.Enabled) { 
                            value = checkBox.Checked;
                        } 
                    }
                }

                if (value != null) { 
                    if (dictionary.Contains(dataField)) {
                        dictionary[dataField] = value; 
                    } 
                    else {
                        dictionary.Add(dataField, value); 
                    }
                }
            }
            else { 
                base.ExtractValuesFromCell(dictionary, cell, rowState, includeReadOnly);
            } 
 

        } 


        protected override void InitializeDataCell(DataControlFieldCell cell, DataControlRowState rowState) {
            if (UseCheckBox) { 
                CheckBox childControl = null;
                CheckBox boundControl = null; 
 
                if (((rowState & DataControlRowState.Edit) != 0 && ReadOnly == false) || (rowState & DataControlRowState.Insert) != 0) {
                    CheckBox editor = new CheckBox(); 
                    childControl = editor;

                    if (DataField.Length != 0 && (rowState & DataControlRowState.Edit) != 0) {
                        boundControl = editor; 
                    }
                } 
                else if (DataField.Length != 0) { 
                    CheckBox editor = new CheckBox();
                    editor.Enabled = false; 
                    childControl = editor;
                    boundControl = editor;
                }
 
                if (childControl != null) {
                    childControl.ToolTip = HeaderText; 
                    cell.Controls.Add(childControl); 
                }
 
                if (boundControl != null) {
                    boundControl.DataBinding += new EventHandler(this.OnDataBindField);
                }
            } 
            else {
                base.InitializeDataCell(cell, rowState); 
            } 
        }
 

        /// 
        /// 
        protected override void OnDataBindField(object sender, EventArgs e) { 
            if (UseCheckBox) {
                Control boundControl = (Control)sender; 
                Control controlContainer = boundControl.NamingContainer; 

 
                object data = GetValue(controlContainer);

                if (!(boundControl is CheckBox)) {
                    throw new HttpException(SR.GetString(SR.CheckBoxField_WrongControlType, DataField)); 
                }
                if (DataBinder.IsNull(data)) { 
                    ((CheckBox)boundControl).Checked = false; 
                }
                else { 
                    if (data is Boolean) {
                        ((CheckBox)boundControl).Checked = (Boolean)data;
                    }
                    else { 
                        try {
                            ((CheckBox)boundControl).Checked = Boolean.Parse(data.ToString()); 
                        } 
                        catch (FormatException fe) {
                            throw new HttpException(SR.GetString(SR.CheckBoxField_CouldntParseAsBoolean, DataField), fe); 
                        }
                    }
                }
            } 
            else {
                base.OnDataBindField(sender, e); 
            } 
        }
 
        /// 
        /// 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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AutoGeneratedField.cs source code in C# .NET

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