C# System类代码示例

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            float floatValue;
            float.TryParse((string)value,System.Globalization.NumberStyles.Number, System.Globalization.CultureInfo.InvariantCulture, out floatValue);

            return ConvertBack(floatValue, (string)parameter);
        }

 private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
 {
     var manager = new TuinManager();
     foreach (Leverancier lev in levOb)
     {
         if (lev.Changed == true)
             GewijzigdeLeveranciers.Add(lev);
         lev.Changed = false;
     }
     if (OudeLeveranciers.Count() != 0 || NieuweLeveranciers.Count() != 0 || GewijzigdeLeveranciers.Count() != 0)
     {
         if (MessageBox.Show("Wilt u alles wegschrijven naar de database ?", "Opslaan", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes)
         {
             if (OudeLeveranciers.Count() != 0)
                 manager.SchrijfVerwijderingen(OudeLeveranciers);
             else if (NieuweLeveranciers.Count() != 0)
                 manager.SchrijfToevoegingen(NieuweLeveranciers);
             else if (GewijzigdeLeveranciers.Count() != 0)
                 manager.SchrijfWijzigingen(GewijzigdeLeveranciers);
         }
     }
     OudeLeveranciers.Clear();
     NieuweLeveranciers.Clear();
     GewijzigdeLeveranciers.Clear();
 }

        public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
        {

            if (actionContext.ModelState.IsValid) return;

            var errors = actionContext.ModelState
                .Where(e => e.Value.Errors.Count > 0)
                .Select(e => new Error
                {
                    Name = e.Key,
                    Message = e.Value.Errors.First().ErrorMessage ?? e.Value.Errors.First().Exception.Message
                }).ToArray();

            var strErrors = new StringBuilder();
            foreach (var error in errors)
            {
                var errorM = String.IsNullOrEmpty(error.Message) ? "Invalid Value" : error.Message;
                strErrors.Append(string.Format("[{0}]:{{{1}}}/", error.Name, errorM));
            }
            actionContext.Response = new HttpResponseMessage
            {
                StatusCode = HttpStatusCode.BadRequest,
                ReasonPhrase = strErrors.ToString(),
                Content = new StringContent(strErrors.ToString())
            };
        }

        protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
        {
            base.OnBackKeyPress(e);

            var isHidden = false;

            try
            {
                if (_avatarControl != null)
                isHidden = _avatarControl.IsHidden;
            }
            catch (Exception)
            {
                Application.Current.Terminate();
            }

            if (isHidden)
            {
                e.Cancel = true;

                PopupManager.Instance.Hide();
            }
            else 
                Application.Current.Terminate();
        }

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            App.SelectedRoom = string.Empty;

            if (IsolatedStorageSettings.ApplicationSettings.Contains("NickName"))
            {
                TxtNickname.Text = IsolatedStorageSettings.ApplicationSettings["NickName"].ToString();
                TxtAge.Text = IsolatedStorageSettings.ApplicationSettings["Age"].ToString();
                TxtAvatarCode.Text = IsolatedStorageSettings.ApplicationSettings["AvatarCode"].ToString();

                _gender = IsolatedStorageSettings.ApplicationSettings["Gender"].ToString();
                var nickColor = IsolatedStorageSettings.ApplicationSettings["NickColor"] is Color ? (Color)IsolatedStorageSettings.ApplicationSettings["NickColor"] : new Color();

                _viewModel.NickColor = new SolidColorBrush(nickColor);

                if (_gender.Equals("m"))
                {
                    BtnMale.Background = (SolidColorBrush)Application.Current.Resources["ButtonBackground"];
                    BtnFemale.Background = (SolidColorBrush)Application.Current.Resources["TransparentBackground"];
                }
                else if (_gender.Equals("f"))
                {
                    BtnMale.Background = (SolidColorBrush) Application.Current.Resources["TransparentBackground"];
                    BtnFemale.Background = (SolidColorBrush) Application.Current.Resources["ButtonBackground"];
                }
                else
                {
                    BtnMale.Background = (SolidColorBrush)Application.Current.Resources["TransparentBackground"];
                    BtnFemale.Background = (SolidColorBrush)Application.Current.Resources["TransparentBackground"];
                }
            }
        }

        public static void drawLine(Vector3 pos1, Vector3 pos2, int bold, System.Drawing.Color color)
        {
            var wts1 = Drawing.WorldToScreen(pos1);
            var wts2 = Drawing.WorldToScreen(pos2);

            Drawing.DrawLine(wts1[0], wts1[1], wts2[0], wts2[1], bold, color);
        }

        private void ArrayBinding_Load(object sender, System.EventArgs e)
        {
            // Access database
            System.Windows.Forms.DataVisualization.Charting.Utilities.SampleMain.MainForm mainForm = (System.Windows.Forms.DataVisualization.Charting.Utilities.SampleMain.MainForm)this.ParentForm;

            // The XML document
            string fileNameString = mainForm.applicationPath + "\\data\\data.xml";
            string fileNameSchema = mainForm.applicationPath + "\\data\\data.xsd";

            // Initializes a new instance of the DataSet class
            DataSet custDS = new DataSet();

            // Reads an XML schema into the DataSet.
            custDS.ReadXmlSchema( fileNameSchema );

            // Reads XML schema and data into the DataSet.
            custDS.ReadXml( fileNameString );

            // Initializes a new instance of the DataView class
            DataView firstView = new DataView(custDS.Tables[0]);

            Chart1.Series.Clear();
            // Since the DataView implements and IEnumerable, pass the reader directly into
            // the DataBindTable method with the name of the column used for the X value.
            Chart1.DataBindTable(firstView, "Name");

            // Set series appearance
            Chart1.Series[0].ChartType = SeriesChartType.Bar;
            Chart1.Series[0].Font = new Font("Trebuchet MS", 8);
            Chart1.Series[0].Color = System.Drawing.Color.FromArgb(220, 224,64,10);
            Chart1.Series[0].BorderWidth = 0;
        }

        public ExportData(System.Data.DataTable dt, string location)
        {
            //instantiate excel objects (application, workbook, worksheets)
            excel.Application XlObj = new excel.Application();
            XlObj.Visible = false;
            excel._Workbook WbObj = (excel.Workbook)(XlObj.Workbooks.Add(""));
            excel._Worksheet WsObj = (excel.Worksheet)WbObj.ActiveSheet;

            //run through datatable and assign cells to values of datatable

                int row = 1; int col = 1;
                foreach (DataColumn column in dt.Columns)
                {
                    //adding columns
                    WsObj.Cells[row, col] = column.ColumnName;
                    col++;
                }
                //reset column and row variables
                col = 1;
                row++;
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    //adding data
                    foreach (var cell in dt.Rows[i].ItemArray)
                    {
                        WsObj.Cells[row, col] = cell;
                        col++;
                    }
                    col = 1;
                    row++;
                }
                WbObj.SaveAs(location);
        }

        public IEnumerable<SelectListItem> GetSelectListItems(System.Web.Routing.RequestContext requestContext, string filter = null)
        {
            var siteName = requestContext.GetRequestValue("siteName");

            var site = new Site(siteName).AsActual();

            IEnumerable<Page> pageList = new List<Page>();

            var rootPages = Kooboo.CMS.Sites.Services.ServiceFactory.PageManager.All(site, null);

            pageList = rootPages.ToList();

            foreach (var r in rootPages)
            {
                this.GenerateList(site, r, ref pageList);
            }

            if (filter == null)
            {
                return null;
            }

            var result = pageList.Where(o => o.VirtualPath.StartsWith(filter, StringComparison.OrdinalIgnoreCase)).Select(o => new SelectListItem { Text = o.VirtualPath, Value = o.VirtualPath });

            return result;
        }

 public void OnMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
 {
     var mouseState = Mouse.GetState();
     var keyboardState = Keyboard.GetState();
     var currentMouseCoordinate = new Vector2(e.X, e.Y);
     if (keyboardState.IsKeyDown(Key.ShiftLeft) && (mouseState[MouseButton.Middle] || (mouseState[MouseButton.Left] && keyboardState[Key.ControlLeft])))
     {
         var d = 5;
         var previousMouseWorldCoordinate = Maths.Project(ViewMatrix, Viewport.ProjectionMatrix, previousMouseCoordinate, (Rectangle)Viewport, Maths.ProjectionTarget.View);
         var mouseWorldCoordinate = Maths.Project(ViewMatrix, ProjectionMatrix, currentMouseCoordinate, (Rectangle)Viewport, Maths.ProjectionTarget.View);
         var delta = mouseWorldCoordinate - previousMouseWorldCoordinate;
         delta *= d;
         panTrack.Update(delta.X, delta.Y);
     }
     else if (keyboardState.IsKeyDown(Key.AltLeft) && (mouseState[MouseButton.Middle] || (mouseState[MouseButton.Left] && keyboardState[Key.ControlLeft])))
     {
         var previousMouseWorldCoordinate = Maths.Project(ViewMatrix, Viewport.ProjectionMatrix, previousMouseCoordinate, (Rectangle)Viewport, Maths.ProjectionTarget.View);
         var mouseWorldCoordinate = Maths.Project(ViewMatrix, ProjectionMatrix, currentMouseCoordinate, (Rectangle)Viewport, Maths.ProjectionTarget.View);
         var delta = mouseWorldCoordinate - previousMouseWorldCoordinate;
         delta *= 10;
         zoomTrack.Update(delta.Y);
     }
     else if (mouseState[MouseButton.Middle] || (mouseState[MouseButton.Left] && keyboardState[Key.ControlLeft]))
     {
         var delta = currentMouseCoordinate - previousMouseCoordinate;
         //delta *= 10;
         orbitTrack.Update(delta.X, delta.Y);
     }
     if (this.MouseMove != null) this.MouseMove(this, new MouseEventArgs(this, new Vector2(e.X, e.Y), default(Vector3), e.Button));
     previousMouseCoordinate = currentMouseCoordinate;
 }

 public override void TouchUp(System.Drawing.PointF global, System.Drawing.PointF relative)
 {
     var videoControl = Source.FindParent<HotelVideoControl>() as HotelVideoControl;
     if (videoControl == null) return;
     videoControl.UnTouchSlider();
     base.TouchUp(global, relative);
 }

        public object Convert(object[] values,
                              Type targetType,
                              object parameter,
                              System.Globalization.CultureInfo culture)
        {
            if (values == null ||
                values.Length != 2)
            {
                return Visibility.Collapsed;
            }

            if (values[0] is IEnumerable<string>)
            {
                var a = (IEnumerable<string>)values[0];
                var b = values[1];

                if (a.Contains(b) == true)
                {
                    return Visibility.Collapsed;
                }
            }
            else if (values[0] is ItemCollection)
            {
                var a = (ItemCollection)values[0];
                var b = values[1];

                if (a.Contains(b) == true)
                {
                    return Visibility.Collapsed;
                }
            }

            return Visibility.Visible;
        }

 public object[] ConvertBack(object value,
                             Type[] targetTypes,
                             object parameter,
                             System.Globalization.CultureInfo culture)
 {
     throw new NotSupportedException();
 }

 /// <summary> This implements only the most basic checking for an email address's validity -- that it contains
 /// an '@' contains no characters disallowed by RFC 2822. This is an overly lenient definition of
 /// validity. We want to generally be lenient here since this class is only intended to encapsulate what's
 /// in a barcode, not "judge" it.
 /// </summary>
 internal static bool isBasicallyValidEmailAddress(System.String email)
 {
     if (email == null)
     {
         return false;
     }
     bool atFound = false;
     for (int i = 0; i < email.Length; i++)
     {
         char c = email[i];
         if ((c < 'a' || c > 'z') && (c < 'A' || c > 'Z') && (c < '0' || c > '9') && !isAtextSymbol(c))
         {
             return false;
         }
         if (c == '@')
         {
             if (atFound)
             {
                 return false;
             }
             atFound = true;
         }
     }
     return atFound;
 }

        public Func<string> First()
        {
            var sources = new[] { this.Male(), this.Female() };
            var factory = _random.Numbers.Integers(max: sources.Length);

            return () => sources[factory()]();
        }