ControlUtil.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / ControlUtil.cs / 1305376 / ControlUtil.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.Collections.Generic; 
using System.Text;
using System.Web.Resources; 
using System.Web.UI;

namespace System.Web.UI {
    internal class ControlUtil { 
        internal static Control FindTargetControl(string controlID, Control control, bool searchNamingContainers) {
            Control foundControl; 
            if (searchNamingContainers) { 
                Control currentContainer;
                foundControl = null; 

                // DevDiv 73305: Do not assume starting control is not a naming container.
                if (control is INamingContainer) {
                    currentContainer = control; 
                }
                else { 
                    currentContainer = control.NamingContainer; 
                }
 
                do {
                    foundControl = currentContainer.FindControl(controlID);
                    currentContainer = currentContainer.NamingContainer;
                } 
                while (foundControl == null && currentContainer != null);
            } 
            else { 
                foundControl = control.FindControl(controlID);
            } 

            return foundControl;
        }
 
        internal static bool IsBuiltInHiddenField(string hiddenFieldName) {
            // Returns true is the field name represents a hidden field generated 
            // by ASP.NET's core runtime. This includes fields such as ViewState and 
            // EventValidation, but not ones generated by specific controls such as
            // TreeView and WebParts. 

            // If the field is less than two chars long it's not built-in. (Perf)
            if (hiddenFieldName.Length <= 2) {
                return false; 
            }
 
            // If it doesn't start with two underscores, it's not built-in. (Perf) 
            if (hiddenFieldName[0] != '_' ||
                hiddenFieldName[1] != '_') { 
                return false;
            }

            // Examine list of built-in ASP.NET fields. The list was created by examining 
            // the ASP.NET source code for hidden field registration and rendering.
            // We exclude __VIEWSTATEENCRYPTED and __VIEWSTATEFIELDCOUNT from the list 
            // since they're covered by the general __VIEWSTATE part. 
            return
                hiddenFieldName.StartsWith("__VIEWSTATE", StringComparison.Ordinal) || 
                String.Equals(hiddenFieldName, "__EVENTVALIDATION", StringComparison.Ordinal) ||
                String.Equals(hiddenFieldName, "__LASTFOCUS", StringComparison.Ordinal) ||
                String.Equals(hiddenFieldName, "__SCROLLPOSITIONX", StringComparison.Ordinal) ||
                String.Equals(hiddenFieldName, "__SCROLLPOSITIONY", StringComparison.Ordinal) || 
                String.Equals(hiddenFieldName, "__EVENTTARGET", StringComparison.Ordinal) ||
                String.Equals(hiddenFieldName, "__EVENTARGUMENT", StringComparison.Ordinal) || 
                String.Equals(hiddenFieldName, "__PREVIOUSPAGE", StringComparison.Ordinal); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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