ValidationSummary.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ValidationSummary.cs / 4 / ValidationSummary.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System.ComponentModel;
    using System.Drawing; 
    using System.Globalization;
    using System.Web;
    using System.Web.UI.HtmlControls;
    using System.Security.Permissions; 
    using System.Web.Util;
 
 
    /// 
    ///    Displays a summary of all validation errors of 
    ///       a page in a list, bulletted list, or single paragraph format. The errors can be displayed inline
    ///       and/or in a popup message box.
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign)] 
    public class ValidationSummary : WebControl { 

        private const String breakTag = "b"; 

        private bool renderUplevel;

 
        /// 
        /// Initializes a new instance of the  class. 
        ///  
        public ValidationSummary() : base(HtmlTextWriterTag.Div) {
            renderUplevel = false; 
            // Red by default
            ForeColor = Color.Red;
        }
 

        ///  
        ///    Gets or sets the display mode of the validation summary. 
        /// 
        [ 
        WebCategory("Appearance"),
        DefaultValue(ValidationSummaryDisplayMode.BulletList),
        WebSysDescription(SR.ValidationSummary_DisplayMode)
        ] 
        public ValidationSummaryDisplayMode DisplayMode {
            get { 
                object o = ViewState["DisplayMode"]; 
                return((o == null) ? ValidationSummaryDisplayMode.BulletList : (ValidationSummaryDisplayMode)o);
            } 
            set {
                if (value < ValidationSummaryDisplayMode.List || value > ValidationSummaryDisplayMode.SingleParagraph) {
                    throw new ArgumentOutOfRangeException("value");
                } 
                ViewState["DisplayMode"] = value;
            } 
        } 

 
        /// 
        ///    [To be supplied.]
        /// 
        [ 
        WebCategory("Behavior"),
        Themeable(false), 
        DefaultValue(true), 
        WebSysDescription(SR.ValidationSummary_EnableClientScript)
        ] 
        public bool EnableClientScript {
            get {
                object o = ViewState["EnableClientScript"];
                return((o == null) ? true : (bool)o); 
            }
            set { 
                ViewState["EnableClientScript"] = value; 
            }
        } 



        ///  
        ///    Gets or sets the foreground color
        ///       (typically the color of the text) of the control. 
        ///  
        [
        DefaultValue(typeof(Color), "Red") 
        ]
        public override Color ForeColor {
            get {
                return base.ForeColor; 
            }
            set { 
                base.ForeColor = value; 
            }
        } 


        /// 
        ///    Gets or sets the header text to be displayed at the top 
        ///       of the summary.
        ///  
        [ 
        Localizable(true),
        WebCategory("Appearance"), 
        DefaultValue(""),
        WebSysDescription(SR.ValidationSummary_HeaderText)
        ]
        public string HeaderText { 
            get {
                object o = ViewState["HeaderText"]; 
                return((o == null) ? String.Empty : (string)o); 
            }
            set { 
                ViewState["HeaderText"] = value;
            }
        }
 

        ///  
        ///    Gets or sets a value indicating whether the validation 
        ///       summary is to be displayed in a pop-up message box.
        ///  
        [
        WebCategory("Behavior"),
        DefaultValue(false),
        WebSysDescription(SR.ValidationSummary_ShowMessageBox) 
        ]
        public bool ShowMessageBox { 
            get { 
                object o = ViewState["ShowMessageBox"];
                return((o == null) ? false : (bool)o); 
            }
            set {
                ViewState["ShowMessageBox"] = value;
            } 
        }
 
 
        /// 
        ///    Gets or sets a value indicating whether the validation 
        ///       summary is to be displayed inline.
        /// 
        [
        WebCategory("Behavior"), 
        DefaultValue(true),
        WebSysDescription(SR.ValidationSummary_ShowSummary) 
        ] 
        public bool ShowSummary {
            get { 
                object o = ViewState["ShowSummary"];
                return((o == null) ? true : (bool)o);
            }
            set { 
                ViewState["ShowSummary"] = value;
            } 
        } 

 
        [
        WebCategory("Behavior"),
        Themeable(false),
        DefaultValue(""), 
        WebSysDescription(SR.ValidationSummary_ValidationGroup)
        ] 
        public virtual string ValidationGroup { 
            get {
                string s = (string)ViewState["ValidationGroup"]; 
                return((s == null) ? string.Empty : s);
            }
            set {
                ViewState["ValidationGroup"] = value; 
            }
        } 
 

        ///  
        /// 
        ///    AddAttributesToRender method.
        /// 
        protected override void AddAttributesToRender(HtmlTextWriter writer) { 
            if (renderUplevel) {
                // We always want validation cotnrols to have an id on the client 
                EnsureID(); 
                string id = ClientID;
 
                // DevDiv 33149: A backward compat. switch for Everett rendering
                HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering) ? writer : null;

                if (HeaderText.Length > 0 ) { 
                    BaseValidator.AddExpandoAttribute(this, expandoAttributeWriter, id, "headertext", HeaderText, true);
                } 
                if (ShowMessageBox) { 
                    BaseValidator.AddExpandoAttribute(this, expandoAttributeWriter, id, "showmessagebox", "True", false);
                } 
                if (!ShowSummary) {
                    BaseValidator.AddExpandoAttribute(this, expandoAttributeWriter, id, "showsummary", "False", false);
                }
                if (DisplayMode != ValidationSummaryDisplayMode.BulletList) { 
                    BaseValidator.AddExpandoAttribute(this, expandoAttributeWriter, id, "displaymode", PropertyConverter.EnumToString(typeof(ValidationSummaryDisplayMode), DisplayMode), false);
                } 
                if (ValidationGroup.Length > 0) { 
                    BaseValidator.AddExpandoAttribute(this, expandoAttributeWriter, id, "validationGroup", ValidationGroup, true);
                } 
            }

            base.AddAttributesToRender(writer);
        } 

        internal String[] GetErrorMessages(out bool inError) { 
            // Fetch errors from the Page 
            String [] errorDescriptions = null;
            inError = false; 

            // see if we are in error and how many messages there are
            int messages = 0;
            ValidatorCollection validators = Page.GetValidators(ValidationGroup); 
            for (int i = 0; i < validators.Count; i++) {
                IValidator val = validators[i]; 
                if (!val.IsValid) { 
                    inError = true;
                    if (val.ErrorMessage.Length != 0) { 
                        messages++;
                    }
                }
            } 

            if (messages != 0) { 
                // get the messages; 
                errorDescriptions = new string [messages];
                int iMessage = 0; 
                for (int i = 0; i < validators.Count; i++) {
                    IValidator val = validators[i];
                    if (!val.IsValid && val.ErrorMessage != null && val.ErrorMessage.Length != 0) {
                        errorDescriptions[iMessage] = string.Copy(val.ErrorMessage); 
                        iMessage++;
                    } 
                } 
                Debug.Assert(messages == iMessage, "Not all messages were found!");
            } 

            return errorDescriptions;
        }
 

        ///  
        ///  
        ///    PreRender method.
        ///  
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);

            // Act like invisible if disabled 
            if (!Enabled) {
                return; 
            } 

            // work out uplevelness now 
            Page page = Page;
            if (page != null && page.RequestInternal != null) {
                renderUplevel = (EnableClientScript
                                 && page.Request.Browser.W3CDomVersion.Major >= 1 
                                 && page.Request.Browser.EcmaScriptVersion.CompareTo(new Version(1, 2)) >= 0);
            } 
            if (renderUplevel) { 
                const string arrayName = "Page_ValidationSummaries";
                string element = "document.getElementById(\"" + ClientID + "\")"; 

                // Cannot use the overloads of Register* that take a Control, since these methods only work with AJAX 3.5,
                // and we need to support Validators in AJAX 1.0 (Windows OS Bugs 2015831).
                if (!Page.IsPartialRenderingSupported) { 
                    Page.ClientScript.RegisterArrayDeclaration(arrayName, element);
                } 
                else { 
                    ValidatorCompatibilityHelper.RegisterArrayDeclaration(this, arrayName, element);
 
                    // Register a dispose script to make sure we clean up the page if we get destroyed
                    // during an async postback.
                    // We should technically use the ScriptManager.RegisterDispose() method here, but the original implementation
                    // of Validators in AJAX 1.0 manually attached a dispose expando.  We added this code back in the product 
                    // late in the Orcas cycle, and we didn't want to take the risk of using RegisterDispose() instead.
                    // (Windows OS Bugs 2015831) 
                    ValidatorCompatibilityHelper.RegisterStartupScript(this, typeof(ValidationSummary), ClientID + "_DisposeScript", 
                        String.Format(
                            CultureInfo.InvariantCulture, 
                            @"
document.getElementById('{0}').dispose = function() {{
    Array.remove({1}, document.getElementById('{0}'));
}} 
",
                            ClientID, arrayName), true); 
                } 
            }
        } 


        /// 
        ///  
        ///    Render method.
        ///  
        protected internal override void Render(HtmlTextWriter writer) { 
            string [] errorDescriptions;
            bool displayContents; 

            if (DesignMode) {
                // Dummy Error state
                errorDescriptions = new string [] { 
                    SR.GetString(SR.ValSummary_error_message_1),
                    SR.GetString(SR.ValSummary_error_message_2), 
                }; 
                displayContents = true;
                renderUplevel = false; 
            }
            else {
                // Act like invisible if disabled
                if (!Enabled) { 
                    return;
                } 
 
                bool inError;
                errorDescriptions = GetErrorMessages(out inError); 
                displayContents = (ShowSummary && inError);

                // Make sure tags are hidden if there are no contents
                if (!displayContents && renderUplevel) { 
                    Style["display"] = "none";
                } 
            } 

            // Make sure we are in a form tag with runat=server. 
            if (Page != null) {
                Page.VerifyRenderingInServerForm(this);
            }
 
            bool displayTags = renderUplevel ? true : displayContents;
 
            if (displayTags) { 
                RenderBeginTag(writer);
            } 

            if (displayContents) {

                string headerSep; 
                string first;
                string pre; 
                string post; 
                string final;
 
                switch (DisplayMode) {
                    case ValidationSummaryDisplayMode.List:
                        headerSep = breakTag;
                        first = String.Empty; 
                        pre = String.Empty;
                        post = breakTag; 
                        final = String.Empty; 
                        break;
 
                    case ValidationSummaryDisplayMode.BulletList:
                        headerSep = String.Empty;
                        first = "";
                        pre = ""; 
                        post = "";
                        final = ""; 
                        break; 

                    case ValidationSummaryDisplayMode.SingleParagraph: 
                        headerSep = " ";
                        first = String.Empty;
                        pre = String.Empty;
                        post = " "; 
                        final = breakTag;
                        break; 
 
                    default:
                        Debug.Fail("Invalid DisplayMode!"); 
                        goto
                    case ValidationSummaryDisplayMode.BulletList;
                }
                if (HeaderText.Length > 0) { 
                    writer.Write(HeaderText);
                    WriteBreakIfPresent(writer, headerSep); 
                } 
                if (errorDescriptions != null) {
                    writer.Write(first); 
                    for (int i = 0; i < errorDescriptions.Length; i++) {
                        Debug.Assert(errorDescriptions[i] != null && errorDescriptions[i].Length > 0, "Bad Error Messages");
                        writer.Write(pre);
                        writer.Write(errorDescriptions[i]); 
                        WriteBreakIfPresent(writer, post);
                    } 
                    WriteBreakIfPresent(writer, final); 
                }
            } 
            if (displayTags) {
                RenderEndTag(writer);
            }
        } 

        private void WriteBreakIfPresent(HtmlTextWriter writer, String text) { 
            if (text == breakTag) { 
                if (EnableLegacyRendering) {
                    writer.WriteObsoleteBreak(); 
                }
                else {
                    writer.WriteBreak();
                } 
            }
            else { 
                writer.Write(text); 
            }
        } 
    }
}
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
ValidationSummary.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
