CustomLineCap.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / CommonUI / System / Drawing / Advanced / CustomLineCap.cs / 1 / CustomLineCap.cs
                        

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

namespace System.Drawing.Drawing2D { 
 
    using Microsoft.Win32;
    using System; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.Drawing.Internal; 
    using System.Runtime.InteropServices;
    using System.Globalization; 
 
    /// 
    ///  
    ///    Encapsulates a custom user-defined line
    ///    cap.
    /// 
    public class CustomLineCap : MarshalByRefObject, ICloneable, IDisposable { 

#if FINALIZATION_WATCH 
        private string allocationSite = Graphics.GetAllocationStack(); 
#endif
 

        /*
         * Handle to native line cap object
         */ 

        internal IntPtr nativeCap; 
 
        // For subclass creation
        internal CustomLineCap() {} 

        /// 
        /// 
        ///     
        ///       Initializes a new instance of the  class with the specified outline
        ///       and fill. 
        ///     
        /// 
        public CustomLineCap(GraphicsPath fillPath, 
                             GraphicsPath strokePath) :
            this(fillPath, strokePath, LineCap.Flat) {}

        ///  
        /// 
        ///     
        ///       Initializes a new instance of the  class from the 
        ///       specified existing  with the specified outline and
        ///       fill. 
        ///    
        /// 
        public CustomLineCap(GraphicsPath fillPath,
                             GraphicsPath strokePath, 
                             LineCap baseCap) :
            this(fillPath, strokePath, baseCap, 0) {} 
 
        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class from the
        ///       specified existing  with the specified outline, fill, and
        ///       inset. 
        ///    
        ///  
        public CustomLineCap(GraphicsPath fillPath, 
                             GraphicsPath strokePath,
                             LineCap baseCap, 
                             float baseInset)
        {
            IntPtr nativeCap = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreateCustomLineCap(
                                new HandleRef(fillPath, (fillPath == null) ? IntPtr.Zero : fillPath.nativePath), 
                                new HandleRef(strokePath, (strokePath == null) ? IntPtr.Zero : strokePath.nativePath), 
                                baseCap, baseInset, out nativeCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            SetNativeLineCap(nativeCap); 
        }
 
        internal CustomLineCap(IntPtr nativeLineCap) 
        {
            SetNativeLineCap(nativeLineCap); 
        }

        internal void SetNativeLineCap(IntPtr handle) {
            if (handle == IntPtr.Zero) 
                throw new ArgumentNullException("handle");
 
            nativeCap = handle; 
        }
 
        /// 
        /// 
        ///    Cleans up Windows resources for this
        /// . 
        /// 
        public void Dispose() { 
            Dispose(true); 
            GC.SuppressFinalize(this);
        } 

        /// 
        protected virtual void Dispose(bool disposing) {
#if FINALIZATION_WATCH 
            if (!disposing && nativeCap != IntPtr.Zero)
                Debug.WriteLine("**********************\nDisposed through finalization:\n" + allocationSite); 
#endif 

            if (nativeCap != IntPtr.Zero) { 
                try{
#if DEBUG
                    int status =
#endif 
                    SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(this, nativeCap));
#if DEBUG 
                    Debug.Assert(status == SafeNativeMethods.Gdip.Ok, "GDI+ returned an error status: " + status.ToString(CultureInfo.InvariantCulture)); 
#endif
                } 
                catch( Exception ex ){
                    if( ClientUtils.IsSecurityOrCriticalException( ex ) ) {
                        throw;
                    } 

                    Debug.Fail( "Exception thrown during Dispose: " + ex.ToString() ); 
                } 
                finally{
                    nativeCap = IntPtr.Zero; 
                }
            }
        }
 
        /// 
        ///  
        ///    Cleans up Windows resources for this 
        /// .
        ///  
        ~CustomLineCap() {
            Dispose(false);
        }
 
        /// 
        ///  
        ///    Creates an exact copy of this . 
        /// 
        public object Clone() 
        {
            IntPtr cloneCap = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipCloneCustomLineCap(new HandleRef(this, nativeCap), out cloneCap); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return CustomLineCap.CreateCustomLineCapObject(cloneCap); 
       }

       internal static CustomLineCap CreateCustomLineCapObject(IntPtr cap)
       { 
            CustomLineCapType capType = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapType(new HandleRef(null, cap), out capType); 

            if (status != SafeNativeMethods.Gdip.Ok) 
            {
                SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap));
                throw SafeNativeMethods.Gdip.StatusException(status);
            } 

            switch (capType) 
            { 
            case CustomLineCapType.Default:
                return new CustomLineCap(cap); 

            case CustomLineCapType.AdjustableArrowCap:
                return new AdjustableArrowCap(cap);
            } 

            SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap)); 
            throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.NotImplemented); 
        }
 
        /// 
        /// 
        ///    Sets the caps used to start and end lines.
        ///  
        public void SetStrokeCaps(LineCap startCap, LineCap endCap)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), startCap, endCap); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        }

        ///  
        /// 
        ///    Gets the caps used to start and end lines. 
        ///  
        public void GetStrokeCaps(out LineCap startCap, out LineCap endCap)
        { 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), out startCap, out endCap);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        private void _SetStrokeJoin(LineJoin lineJoin) 
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), lineJoin); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        private LineJoin _GetStrokeJoin() 
        { 
            LineJoin lineJoin;
 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), out lineJoin);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return lineJoin; 
        } 

        ///  
        /// 
        ///    Gets or sets the  used by this custom cap.
        /// 
        public LineJoin StrokeJoin 
        {
            get { return _GetStrokeJoin(); } 
            set { _SetStrokeJoin(value); } 
        }
 
        private void _SetBaseCap(LineCap baseCap)
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseCap(new HandleRef(this, nativeCap), baseCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        private LineCap _GetBaseCap() 
        {
            LineCap baseCap;
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseCap(new HandleRef(this, nativeCap), out baseCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return baseCap;
        } 

        /// 
        /// 
        ///    Gets or sets the  on which this  is based. 
        /// 
        public LineCap BaseCap 
        { 
            get { return _GetBaseCap(); }
            set { _SetBaseCap(value); } 
        }

        private void _SetBaseInset(float inset)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseInset(new HandleRef(this, nativeCap), inset);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        private float _GetBaseInset()
        {
            float inset; 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseInset(new HandleRef(this, nativeCap), out inset);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return inset;
        }

        ///  
        /// 
        ///    Gets or sets the distance between the cap 
        ///    and the line. 
        /// 
        public float BaseInset 
        {
            get { return _GetBaseInset(); }
            set { _SetBaseInset(value); }
        } 

        private void _SetWidthScale(float widthScale) 
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapWidthScale(new HandleRef(this, nativeCap), widthScale);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        private float _GetWidthScale()
        { 
            float widthScale; 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapWidthScale(new HandleRef(this, nativeCap), out widthScale);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            return widthScale; 
        }
 
        ///  
        /// 
        ///    Gets or sets the amount by which to scale 
        ///    the width of the cap.
        /// 
        public float WidthScale
        { 
            get { return _GetWidthScale(); }
            set { _SetWidthScale(value); } 
        } 
    }
} 

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

namespace System.Drawing.Drawing2D { 
 
    using Microsoft.Win32;
    using System; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.Drawing.Internal; 
    using System.Runtime.InteropServices;
    using System.Globalization; 
 
    /// 
    ///  
    ///    Encapsulates a custom user-defined line
    ///    cap.
    /// 
    public class CustomLineCap : MarshalByRefObject, ICloneable, IDisposable { 

#if FINALIZATION_WATCH 
        private string allocationSite = Graphics.GetAllocationStack(); 
#endif
 

        /*
         * Handle to native line cap object
         */ 

        internal IntPtr nativeCap; 
 
        // For subclass creation
        internal CustomLineCap() {} 

        /// 
        /// 
        ///     
        ///       Initializes a new instance of the  class with the specified outline
        ///       and fill. 
        ///     
        /// 
        public CustomLineCap(GraphicsPath fillPath, 
                             GraphicsPath strokePath) :
            this(fillPath, strokePath, LineCap.Flat) {}

        ///  
        /// 
        ///     
        ///       Initializes a new instance of the  class from the 
        ///       specified existing  with the specified outline and
        ///       fill. 
        ///    
        /// 
        public CustomLineCap(GraphicsPath fillPath,
                             GraphicsPath strokePath, 
                             LineCap baseCap) :
            this(fillPath, strokePath, baseCap, 0) {} 
 
        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class from the
        ///       specified existing  with the specified outline, fill, and
        ///       inset. 
        ///    
        ///  
        public CustomLineCap(GraphicsPath fillPath, 
                             GraphicsPath strokePath,
                             LineCap baseCap, 
                             float baseInset)
        {
            IntPtr nativeCap = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreateCustomLineCap(
                                new HandleRef(fillPath, (fillPath == null) ? IntPtr.Zero : fillPath.nativePath), 
                                new HandleRef(strokePath, (strokePath == null) ? IntPtr.Zero : strokePath.nativePath), 
                                baseCap, baseInset, out nativeCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            SetNativeLineCap(nativeCap); 
        }
 
        internal CustomLineCap(IntPtr nativeLineCap) 
        {
            SetNativeLineCap(nativeLineCap); 
        }

        internal void SetNativeLineCap(IntPtr handle) {
            if (handle == IntPtr.Zero) 
                throw new ArgumentNullException("handle");
 
            nativeCap = handle; 
        }
 
        /// 
        /// 
        ///    Cleans up Windows resources for this
        /// . 
        /// 
        public void Dispose() { 
            Dispose(true); 
            GC.SuppressFinalize(this);
        } 

        /// 
        protected virtual void Dispose(bool disposing) {
#if FINALIZATION_WATCH 
            if (!disposing && nativeCap != IntPtr.Zero)
                Debug.WriteLine("**********************\nDisposed through finalization:\n" + allocationSite); 
#endif 

            if (nativeCap != IntPtr.Zero) { 
                try{
#if DEBUG
                    int status =
#endif 
                    SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(this, nativeCap));
#if DEBUG 
                    Debug.Assert(status == SafeNativeMethods.Gdip.Ok, "GDI+ returned an error status: " + status.ToString(CultureInfo.InvariantCulture)); 
#endif
                } 
                catch( Exception ex ){
                    if( ClientUtils.IsSecurityOrCriticalException( ex ) ) {
                        throw;
                    } 

                    Debug.Fail( "Exception thrown during Dispose: " + ex.ToString() ); 
                } 
                finally{
                    nativeCap = IntPtr.Zero; 
                }
            }
        }
 
        /// 
        ///  
        ///    Cleans up Windows resources for this 
        /// .
        ///  
        ~CustomLineCap() {
            Dispose(false);
        }
 
        /// 
        ///  
        ///    Creates an exact copy of this . 
        /// 
        public object Clone() 
        {
            IntPtr cloneCap = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipCloneCustomLineCap(new HandleRef(this, nativeCap), out cloneCap); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return CustomLineCap.CreateCustomLineCapObject(cloneCap); 
       }

       internal static CustomLineCap CreateCustomLineCapObject(IntPtr cap)
       { 
            CustomLineCapType capType = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapType(new HandleRef(null, cap), out capType); 

            if (status != SafeNativeMethods.Gdip.Ok) 
            {
                SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap));
                throw SafeNativeMethods.Gdip.StatusException(status);
            } 

            switch (capType) 
            { 
            case CustomLineCapType.Default:
                return new CustomLineCap(cap); 

            case CustomLineCapType.AdjustableArrowCap:
                return new AdjustableArrowCap(cap);
            } 

            SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap)); 
            throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.NotImplemented); 
        }
 
        /// 
        /// 
        ///    Sets the caps used to start and end lines.
        ///  
        public void SetStrokeCaps(LineCap startCap, LineCap endCap)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), startCap, endCap); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        }

        ///  
        /// 
        ///    Gets the caps used to start and end lines. 
        ///  
        public void GetStrokeCaps(out LineCap startCap, out LineCap endCap)
        { 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), out startCap, out endCap);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        private void _SetStrokeJoin(LineJoin lineJoin) 
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), lineJoin); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        private LineJoin _GetStrokeJoin() 
        { 
            LineJoin lineJoin;
 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), out lineJoin);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return lineJoin; 
        } 

        ///  
        /// 
        ///    Gets or sets the  used by this custom cap.
        /// 
        public LineJoin StrokeJoin 
        {
            get { return _GetStrokeJoin(); } 
            set { _SetStrokeJoin(value); } 
        }
 
        private void _SetBaseCap(LineCap baseCap)
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseCap(new HandleRef(this, nativeCap), baseCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        private LineCap _GetBaseCap() 
        {
            LineCap baseCap;
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseCap(new HandleRef(this, nativeCap), out baseCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return baseCap;
        } 

        /// 
        /// 
        ///    Gets or sets the  on which this  is based. 
        /// 
        public LineCap BaseCap 
        { 
            get { return _GetBaseCap(); }
            set { _SetBaseCap(value); } 
        }

        private void _SetBaseInset(float inset)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseInset(new HandleRef(this, nativeCap), inset);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        private float _GetBaseInset()
        {
            float inset; 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseInset(new HandleRef(this, nativeCap), out inset);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return inset;
        }

        ///  
        /// 
        ///    Gets or sets the distance between the cap 
        ///    and the line. 
        /// 
        public float BaseInset 
        {
            get { return _GetBaseInset(); }
            set { _SetBaseInset(value); }
        } 

        private void _SetWidthScale(float widthScale) 
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapWidthScale(new HandleRef(this, nativeCap), widthScale);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        private float _GetWidthScale()
        { 
            float widthScale; 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapWidthScale(new HandleRef(this, nativeCap), out widthScale);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            return widthScale; 
        }
 
        ///  
        /// 
        ///    Gets or sets the amount by which to scale 
        ///    the width of the cap.
        /// 
        public float WidthScale
        { 
            get { return _GetWidthScale(); }
            set { _SetWidthScale(value); } 
        } 
    }
} 

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

                        

                        

                        
                        

Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK

• WebPartChrome.cs
• SubMenuStyle.cs
• DecoderBestFitFallback.cs
• RealProxy.cs
• ApplicationSettingsBase.cs
• RawMouseInputReport.cs
• CompressEmulationStream.cs
• QueryCreatedEventArgs.cs
• XmlWrappingReader.cs
• SubstitutionResponseElement.cs
• Typeface.cs
• AsymmetricSignatureDeformatter.cs
• FloaterParagraph.cs
• XmlElementList.cs
• CompoundFileDeflateTransform.cs
• unitconverter.cs
• LockRenewalTask.cs
• StagingAreaInputItem.cs
• RepeatInfo.cs
• DragDeltaEventArgs.cs
• DaylightTime.cs
• LinkedDataMemberFieldEditor.cs
• StorageScalarPropertyMapping.cs
• EntityTemplateFactory.cs
• TimeManager.cs
• XmlIlGenerator.cs
• DocumentPropertiesDialog.cs
• CorrelationToken.cs
• ChildrenQuery.cs
• WebDescriptionAttribute.cs
• Image.cs
• VectorCollectionConverter.cs
• CompensatableTransactionScopeActivity.cs
• cache.cs
• MetadataFile.cs
• PropertyInfoSet.cs
• ManifestResourceInfo.cs
• DynamicContractTypeBuilder.cs
• ListSortDescriptionCollection.cs
• LinqDataSourceDisposeEventArgs.cs
• ZoneMembershipCondition.cs
• EventSource.cs
• _DigestClient.cs
• FileNotFoundException.cs
• NativeMethods.cs
• BuildResultCache.cs
• Win32.cs
• Vector3dCollection.cs
• DiagnosticsConfigurationHandler.cs
• WorkflowControlEndpoint.cs
• ColumnCollection.cs
• ActivationService.cs
• ActivityBindForm.cs
• DBSchemaRow.cs
• GetPageCompletedEventArgs.cs
• DataGridSortCommandEventArgs.cs
• IOException.cs
• WmlFormAdapter.cs
• BitmapCodecInfo.cs
• EndPoint.cs
• FileSecurity.cs
• Interfaces.cs
• IProvider.cs
• LastQueryOperator.cs
• DoubleKeyFrameCollection.cs
• Canvas.cs
• AttachedPropertyBrowsableWhenAttributePresentAttribute.cs
• WindowsProgressbar.cs
• RectIndependentAnimationStorage.cs
• SpellerInterop.cs
• XmlResolver.cs
• GetUserPreferenceRequest.cs
• CodeNamespaceImport.cs
• SymDocumentType.cs
• XsdDataContractExporter.cs
• ErrorProvider.cs
• BamlLocalizer.cs
• MonthCalendarDesigner.cs
• TerminatorSinks.cs
• Int32EqualityComparer.cs
• FileReservationCollection.cs
• SmtpReplyReaderFactory.cs
• OdbcStatementHandle.cs
• Help.cs
• CaseInsensitiveOrdinalStringComparer.cs
• SqlNamer.cs
• UnionCodeGroup.cs
• UnsignedPublishLicense.cs
• BatchParser.cs
• DataGridViewCellCollection.cs
• OletxTransactionHeader.cs
• EntityDataSourceViewSchema.cs
• UnsafeNativeMethods.cs
• PersonalizableTypeEntry.cs
• RenderDataDrawingContext.cs
• M3DUtil.cs
• HttpDictionary.cs
• WsatAdminException.cs
• DPTypeDescriptorContext.cs
• MemberInitExpression.cs