BindUriHelper.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Utility / BindUriHelper.cs / 4 / BindUriHelper.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2001
//
//  File:           BindUriHelper.cs 
//
//  Description:    BindUriHelper class. Allows bindToObject, bindToStream 
// 
//  History:        04-13-01 - [....] - created
//----------------------------------------------------------------------------- 
using System;
using System.IO;
using System.ComponentModel;
using System.Diagnostics; 
using System.Globalization;
using System.Text; 
using MS.Win32; 
using System.Security.Permissions;
 
#if PRESENTATIONFRAMEWORK

using System.Windows;
using System.Windows.Navigation; 
using System.Windows.Media;
using MS.Internal.PresentationFramework; 
using MS.Internal.AppModel; 
using System.Windows.Controls;
using MS.Internal ; 
using System.Security;
using System.IO.Packaging;
using System.Reflection;
using MS.Internal.Utility; 
using System.Net;
 
// In order to avoid generating warnings about unknown message numbers and 
// unknown pragmas when compiling your C# source code with the actual C# compiler,
// you need to disable warnings 1634 and 1691. (Presharp Documentation) 
#pragma warning disable 1634, 1691


namespace MS.Internal.Utility 
{
    // A BindUriHelper class 
    // See also WpfWebRequestHelper. 
    internal  static partial  class BindUriHelper
    { 

        private const string PLACEBOURI = "http://microsoft.com/";
        static private Uri placeboBase = new Uri(PLACEBOURI);
        private const string FRAGMENTMARKER = "#"; 

        static internal Uri GetResolvedUri(Uri originalUri) 
        { 
            return GetResolvedUri(null, originalUri);
        } 

        /// 
        ///
        ///  
        /// 
        ///     Relative Uri resolution logic 
        /// 
        ///     if baseUriString != ""
        ///     { 
        ///         if (baseUriString is absolute uri)
        ///         {
        ///             determine uriToNavigate as baseUriString + inputUri
        ///         } 
        ///         else
        ///         { 
        ///             determine uri to navigate wrt application's base uri + baseUriString + inputUri 
        ///         }
        ///     } 
        ///     else
        ///     {
        ///         Get the element's NavigationService
        ///         if(NavigationService.CurrentSource is absolute uri) 
        ///         {
        ///             determine uriToNavigate as NavigationService.CurrentSource + inputUri 
        ///         } 
        ///         else // this will be more common
        ///         { 
        ///             determine uriToNavigate wrt application's base uri (pack://application,,,/) + NavigationService.CurrentSource + inputUri
        ///         }
        ///
        /// 
        ///         If no ns in tree, resolve against the application's base
        ///     } 
        ///  
        /// 
        ///  
        /// 
        /// 
        static internal Uri GetUriToNavigate(DependencyObject element, Uri baseUri, Uri inputUri)
        { 
            Uri uriToNavigate = inputUri;
 
            if ((inputUri == null) || (inputUri.IsAbsoluteUri == true)) 
            {
                return uriToNavigate; 
            }

            // BaseUri doesn't contain the last part of the path: filename,
            // so when the inputUri is fragment we cannot resolve with BaseUri, instead 
            // we should resolve with the element's NavigationService's CurrentSource.
            if (StartWithFragment(inputUri)) 
            { 
                baseUri = null;
            } 

            if (baseUri != null)
            {
                if (baseUri.IsAbsoluteUri == false) 
                {
                    uriToNavigate = GetResolvedUri(BindUriHelper.GetResolvedUri(null, baseUri), inputUri); 
                } 
                else
                { 
                    uriToNavigate = GetResolvedUri(baseUri, inputUri);
                }
            }
            else // we're in here when baseUri is not set i.e. it's null 
            {
                Uri currentSource = null; 
 
                // if the it is an INavigator (Frame, NavWin), we should use its CurrentSource property.
                // Otherwise we need to get NavigationService of the container that this element is hosted in, 
                // and use its CurrentSource.
                if (element != null)
                {
                    INavigator navigator = element as INavigator; 
                    if (navigator != null)
                    { 
                        currentSource = navigator.CurrentSource; 
                    }
                    else 
                    {
                        NavigationService ns = null;
                        ns = element.GetValue(NavigationService.NavigationServiceProperty) as NavigationService;
                        currentSource = (ns == null) ? null : ns.CurrentSource; 
                    }
                } 
 
                if (currentSource != null)
                { 
                    if (currentSource.IsAbsoluteUri)
                    {
                        uriToNavigate = GetResolvedUri(currentSource, inputUri);
                    } 
                    else
                    { 
                        uriToNavigate = GetResolvedUri(GetResolvedUri(null, currentSource), inputUri); 
                    }
                } 
                else
                {
                    //
 

 
 
                    // For now we resolve to Application's base
                    uriToNavigate = BindUriHelper.GetResolvedUri(null, inputUri); 
                }
            }
            return uriToNavigate;
        } 

        static internal bool StartWithFragment(Uri uri) 
        { 
            return uri.OriginalString.StartsWith(FRAGMENTMARKER, StringComparison.Ordinal);
        } 

        // Return Fragment string for a given uri without the leading #
        static internal string GetFragment(Uri uri)
        { 
            Uri workuri = uri;
            string fragment = String.Empty; 
            string frag; 

            if (uri.IsAbsoluteUri == false) 
            {
                // this is a relative uri, and Fragement() doesn't work with relative uris.  The base uri is completley irrelevant
                // here and will never affect the returned fragment, but the method requires something to be there.  Therefore,
                // we will use "http://microsoft.com" as a convenient substitute. 
                workuri = new Uri(placeboBase, uri);
            } 
 
            frag = workuri.Fragment;
            if (frag != null && frag.Length > 0) 
            {
                // take off the pound
                fragment = frag.Substring(1);
            } 

            return fragment; 
        } 

        // In NavigationService we do not want to show users pack://application,,,/ with the 
        // Source property or any event arguments.
        static internal Uri GetUriRelativeToPackAppBase(Uri original)
        {
            if (original == null) 
            {
                return null; 
            } 

            Uri resolved = GetResolvedUri(original); 
            Uri packUri = BaseUriHelper.PackAppBaseUri;
            Uri relative = packUri.MakeRelativeUri(resolved);

            return relative; 
        }
 
        static internal bool IsXamlMimeType(ContentType mimeType) 
        {
            if (MimeTypeMapper.XamlMime.AreTypeAndSubTypeEqual(mimeType) 
                || MimeTypeMapper.FixedDocumentSequenceMime.AreTypeAndSubTypeEqual(mimeType)
                || MimeTypeMapper.FixedDocumentMime.AreTypeAndSubTypeEqual(mimeType)
                || MimeTypeMapper.FixedPageMime.AreTypeAndSubTypeEqual(mimeType))
            { 
                return true;
            } 
 
            return false;
        } 
    }
}

#endif 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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