HyperLinkColumn.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / HyperLinkColumn.cs / 1 / HyperLinkColumn.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Globalization;
    using System.Web;
    using System.Web.UI; 
    using System.Security.Permissions;
    using System.Web.Util; 
 

    ///  
    /// Creates a column within the  containing hyperlinks that
    ///    navigate to specified URLs.
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class HyperLinkColumn : DataGridColumn { 
 
        private PropertyDescriptor textFieldDesc;
        private PropertyDescriptor urlFieldDesc; 


        /// 
        /// Initializes a new instance of the  class. 
        /// 
        public HyperLinkColumn() { 
        } 

 

        /// 
        /// Gets or sets the field in the DataSource that provides the URL of the page to navigate to.
        ///  
        [
        WebCategory("Data"), 
        DefaultValue(""), 
        WebSysDescription(SR.HyperLinkColumn_DataNavigateUrlField)
        ] 
        public virtual string DataNavigateUrlField {
            get {
                object o = ViewState["DataNavigateUrlField"];
                if (o != null) 
                    return(string)o;
                return String.Empty; 
            } 
            set {
                ViewState["DataNavigateUrlField"] = value; 
                OnColumnChanged();
            }
        }
 

        ///  
        /// Gets or sets the formatting applied to the  
        /// property.
        ///  
        [
        WebCategory("Data"),
        DefaultValue(""),
        DescriptionAttribute("The formatting applied to the value bound to the NavigateUrl property.") 
        ]
        public virtual string DataNavigateUrlFormatString { 
            get { 
                object o = ViewState["DataNavigateUrlFormatString"];
                if (o != null) 
                    return(string)o;
                return String.Empty;
            }
            set { 
                ViewState["DataNavigateUrlFormatString"] = value;
                OnColumnChanged(); 
            } 
        }
 

        /// 
        /// Gets or sets the field in the DataSource that will be used as the source of
        ///    data for the  property. 
        /// 
        [ 
        WebCategory("Data"), 
        DefaultValue(""),
        WebSysDescription(SR.HyperLinkColumn_DataTextField) 
        ]
        public virtual string DataTextField {
            get {
                object o = ViewState["DataTextField"]; 
                if (o != null)
                    return(string)o; 
                return String.Empty; 
            }
            set { 
                ViewState["DataTextField"] = value;
                OnColumnChanged();
            }
        } 

 
        ///  
        /// Gets or sets the formatting applied to the 
        /// property. 
        /// 
        [
        WebCategory("Data"),
        DefaultValue(""), 
        DescriptionAttribute("The formatting applied to the value bound to the Text property.")
        ] 
        public virtual string DataTextFormatString { 
            get {
                object o = ViewState["DataTextFormatString"]; 
                if (o != null)
                    return(string)o;
                return String.Empty;
            } 
            set {
                ViewState["DataTextFormatString"] = value; 
                OnColumnChanged(); 
            }
        } 


        /// 
        ///    Gets or sets the URL to navigate to when the hyperlink is clicked. 
        /// 
        [ 
        WebCategory("Behavior"), 
        DefaultValue(""),
        UrlProperty(), 
        WebSysDescription(SR.HyperLinkColumn_NavigateUrl)
        ]
        public virtual string NavigateUrl {
            get { 
                object o = ViewState["NavigateUrl"];
                if (o != null) 
                    return(string)o; 
                return String.Empty;
            } 
            set {
                ViewState["NavigateUrl"] = value;
                OnColumnChanged();
            } 
        }
 
 
        /// 
        ///    Gets or sets the window or target frame that is 
        ///       used to display the contents resulting from the hyperlink.
        /// 
        [
        WebCategory("Behavior"), 
        DefaultValue(""),
        TypeConverter(typeof(TargetConverter)), 
        WebSysDescription(SR.HyperLink_Target) 
        ]
        public virtual string Target { 
            get {
                object o = ViewState["Target"];
                if (o != null)
                    return(string)o; 
                return String.Empty;
            } 
            set { 
                ViewState["Target"] = value;
                OnColumnChanged(); 
            }
        }

 
        /// 
        ///    Gets or sets the text to display for the hyperlink. 
        ///  
        [
        Localizable(true), 
        WebCategory("Appearance"),
        DefaultValue(""),
        WebSysDescription(SR.HyperLinkColumn_Text)
        ] 
        public virtual string Text {
            get { 
                object o = ViewState["Text"]; 
                if (o != null)
                    return(string)o; 
                return String.Empty;
            }
            set {
                ViewState["Text"] = value; 
                OnColumnChanged();
            } 
        } 

 

        /// 
        /// 
        protected virtual string FormatDataNavigateUrlValue(object dataUrlValue) { 
            string formattedUrlValue = String.Empty;
 
            if (!DataBinder.IsNull(dataUrlValue)) { 
                string formatting = DataNavigateUrlFormatString;
                if (formatting.Length == 0) { 
                    formattedUrlValue = dataUrlValue.ToString();
                }
                else {
                    formattedUrlValue = String.Format(CultureInfo.CurrentCulture, formatting, dataUrlValue); 
                }
            } 
 
            return formattedUrlValue;
        } 


        /// 
        ///  
        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 void Initialize() { 
            base.Initialize(); 
            textFieldDesc = null;
            urlFieldDesc = null; 
        }


        ///  
        ///    
        ///       Initializes the cell representing this column with the 
        ///       contained hyperlink. 
        /// 
        public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) { 
            base.InitializeCell(cell, columnIndex, itemType);

            if ((itemType != ListItemType.Header) &&
                (itemType != ListItemType.Footer)) { 
                HyperLink hyperLink = new HyperLink();
 
                hyperLink.Text = Text; 
                hyperLink.NavigateUrl = NavigateUrl;
                hyperLink.Target = Target; 

                if ((DataNavigateUrlField.Length != 0) ||
                    (DataTextField.Length != 0)) {
                    hyperLink.DataBinding += new EventHandler(this.OnDataBindColumn); 
                }
 
                cell.Controls.Add(hyperLink); 
            }
        } 


        /// 
        ///  
        private void OnDataBindColumn(object sender, EventArgs e) {
            Debug.Assert((DataTextField.Length != 0) || (DataNavigateUrlField.Length != 0), 
                         "Shouldn't be DataBinding without a DataTextField and DataNavigateUrlField"); 

            HyperLink boundControl = (HyperLink)sender; 
            DataGridItem item = (DataGridItem)boundControl.NamingContainer;
            object dataItem = item.DataItem;

            if ((textFieldDesc == null) && (urlFieldDesc == null)) { 
                PropertyDescriptorCollection props = TypeDescriptor.GetProperties(dataItem);
                string fieldName; 
 
                fieldName = DataTextField;
                if (fieldName.Length != 0) { 
                    textFieldDesc = props.Find(fieldName, true);
                    if ((textFieldDesc == null) && !DesignMode) {
                        throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
                    } 
                }
 
                fieldName = DataNavigateUrlField; 
                if (fieldName.Length != 0) {
                    urlFieldDesc = props.Find(fieldName, true); 
                    if ((urlFieldDesc == null) && !DesignMode) {
                        throw new HttpException(SR.GetString(SR.Field_Not_Found, fieldName));
                    }
                } 
            }
 
            if (textFieldDesc != null) { 
                object data = textFieldDesc.GetValue(dataItem);
                string dataValue = FormatDataTextValue(data); 

                boundControl.Text = dataValue;
            }
            else if (DesignMode && (DataTextField.Length != 0)) { 
                boundControl.Text = SR.GetString(SR.Sample_Databound_Text);
            } 
 
            if (urlFieldDesc != null) {
                object data = urlFieldDesc.GetValue(dataItem); 
                string dataValue = FormatDataNavigateUrlValue(data);

                boundControl.NavigateUrl = dataValue;
            } 
            else if (DesignMode && (DataNavigateUrlField.Length != 0)) {
                boundControl.NavigateUrl = "url"; 
            } 
        }
    } 
}
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HyperLinkColumn.cs source code in C# .NET

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