BeginGetFileNameFromUserRequest.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / BeginGetFileNameFromUserRequest.cs / 1 / BeginGetFileNameFromUserRequest.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace Microsoft.InfoCards
{ 
    using System;
    using System.IO; 
    using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace; 

    // 
    // Summary
    // Processes beginning of asynchronous get file name from user request.
    //
    internal class BeginGetFileNameFromUserRequest : UIAgentAsyncBeginRequest 
    {
        bool m_getContent;  // Stores whether file contents are to be returned. 
        string m_arguments; // Stores arguments passed to agent on user desktop. 

        // 
        // Summary
        // Constructs request.
        //
        // Arguments 
        // rpcHandle - Specifies the RPC context handle.
        // inArgs    - Specifies the stream to hold the input arguments. 
        // outArgs   - Specifies the stream to hold the output arguments. 
        // parent    - Specifies the parent UI request.
        // 
        public BeginGetFileNameFromUserRequest( IntPtr rpcHandle, Stream inArgs, Stream outArgs, ClientUIRequest parent )
            : base( rpcHandle, inArgs, outArgs, parent )
        {
        } 

        // 
        // Summary 
        // Reads input arguments from stream.
        // 
        // Arguments
        // reader - Specifies a binary reader.
        //
        protected override void OnMarshalAsyncInArgs( BinaryReader reader ) 
        {
            m_getContent = reader.ReadBoolean(); 
            m_arguments = Utility.DeserializeString( reader ); 
        }
 
        //
        // Summary
        // Gets file from user.
        // 
        // Remarks
        // This method is called from a thread pool thread. 
        // 
        // Arguments
        // asyncParams - Specifies asynchronous parameters. 
        //
        protected override object AsyncExecute( AsyncParams asyncParams )
        {
            uint error = 0; 
            string fileName = String.Empty;
            GetFileNameResult result = new GetFileNameResult(); 
 
            //
            // Start agent on user desktop to get file from user. 
            //
            using( SystemIdentity lsa = new SystemIdentity( true ) )
            {
                error = NativeMcppMethods.CreateAndWaitForFileOpenDialogWrapper( 
                    m_arguments, RequestorIdentity, ParentRequest.CallerPid, ref fileName );
            } 
 
            if( 0 == error )
            { 
                try
                {
                    //
                    // Store file name. 
                    //
                    result.FileName = fileName; 
 
                    //
                    // If contents were requested and user choose a file then read and store contents. 
                    //
                    if( m_getContent && !String.IsNullOrEmpty( fileName ) )
                    {
                        FileInfo f = new FileInfo( fileName ); 

                        using( FileStream file = File.OpenRead( fileName ) ) 
                        { 
                            BinaryReader reader = new InfoCardBinaryReader( file );
                            result.FileContent = reader.ReadBytes( (int) f.Length ); 
                        }
                    }
                }
                catch( Exception e ) 
                {
                    if( IDT.IsFatal( e ) ) 
                    { 
                        throw;
                    } 

                    throw IDT.ThrowHelperError( new FileAccessException( SR.GetString( SR.ServiceInaccessibleFile ), e ) );
                }
            } 
            else
            { 
                IDT.TraceDebug( "ICARDACCESS:Failed to create process with error {0}", error ); 
            }
 
            return result;
        }

        // 
        // Summary
        // The ability to cancel this request is not needed as the user desktop is active and the agent on this desktop 
        // may be closed to end this request without choosing a file. 
        //
        protected override void AsyncCancel() 
        {
            ;
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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BeginGetFileNameFromUserRequest.cs source code in C# .NET

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