Question

嗨，我在存储库域中有很多重复的代码，例如

public CommonModel GetLocations(IModelWithCurrentUser<xyz> model)
{
    var sqlParameters = SqlHelpers.GetReportSqlParameters(model);
    var outputParameters = new Dictionary<string, object>() { { "TotalCount", default(int) } };
    var result = _queryExecutor.QueryWithOutputParameters<Locations>(PermissionsQueries.GetLocations, sqlParameters, outputParameters);
    var totalCount = Convert.ToInt32(outputParameters["TotalCount"]);
    return RepositoryConverter.ToCommonDSModel(result, model.Content, totalCount);
}

我试图制作一个像这样的通用方法：

public CommonModel GetSqlReport<T>(IModelWithCurrentUser<xyz> model, string queryName)
{
    var sqlParameters = SqlHelpers.GetReportSqlParameters(model);
    var outputParameters = new Dictionary<string, object>() { { "TotalCount", default(int) } };
    var result = _queryExecutor.QueryWithOutputParameters<T>(queryName, sqlParameters, outputParameters);
    var totalCount = Convert.ToInt32(outputParameters["TotalCount"]);
    return RepositoryConverter.ToCommonDSModel(result, model.Content, totalCount);
}

但是不幸的是，在编译代码时出现错误：不能在方法

中从“ System.Collections.Generic.List角色”转换为“ System.Collections.Generic.List角色”

  return RepositoryConverter.ToCommonDSModel(result, model.Content, totalCount);

respoitoryConverter方法ToCommonDSModel按列表类型正在重载，下面是一些示例：

public static CommonModel ToCommonDSModel(List<Roles> data, xyz dtoModel, long itemsCount)
public static CommonModel ToCommonDSModel(List<Locations> data, xyz dtoModel, long itemsCount)
public static CommonModel ToCommonDSModel(List<abc> data, xyz dtoModel, long itemsCount)

我的问题是如何删除存储库域中的代码重复项？

Answer 1

您在这里：

FILES/PROCESSING/@{formatDateTime(utcnow(),'yyyy')}/@{formatDateTime(utcnow(),'MM')}/@{formatDateTime(utcnow(),'dd')}/*.zip

秘诀在于使用public CommonModel GetSqlReport<T>(IModelWithCurrentUser<xyz> model, string queryName) { var sqlParameters = SqlHelpers.GetReportSqlParameters(model); var outputParameters = new Dictionary<string, object>() { { "TotalCount", default(int) } }; var result = _queryExecutor.QueryWithOutputParameters<T>(queryName, sqlParameters, outputParameters); var totalCount = Convert.ToInt32(outputParameters["TotalCount"]); return RepositoryConverter.ToCommonDSModel<T>(result, model.Content, totalCount); } public static class RepositoryConverter { private static Dictionary<Type, Delegate> __map = new Dictionary<Type, Delegate>() { { typeof(Roles), (Func<List<Roles>, xyz, long, CommonModel>)ToCommonDSModel }, { typeof(Locations), (Func<List<Locations>, xyz, long, CommonModel>)ToCommonDSModel }, { typeof(abc), (Func<List<abc>, xyz, long, CommonModel>)ToCommonDSModel }, } public static CommonModel ToCommonDSModel<T>(List<T> data, xyz dtoModel, long itemsCount) => ((Func<List<T>, xyz, long, CommonModel>)__map[typeof(T)])(data, dtoModel, itemsCount); public static CommonModel ToCommonDSModel(List<Roles> data, xyz dtoModel, long itemsCount) => /* implementation here */; public static CommonModel ToCommonDSModel(List<Locations> data, xyz dtoModel, long itemsCount) => /* implementation here */; public static CommonModel ToCommonDSModel(List<abc> data, xyz dtoModel, long itemsCount) => /* implementation here */; }来保存您根据通用类型Dictionary<Type, Delegate>检索的不同类型的函数。

Answer 2

好的，谢谢：D提供了非常好的代码，但是在另一个论坛上，我发现了这种方式：

更改

<script type="text/javascript"
  src="http://maps.google.com/maps/api/js?sensor=false&libraries=drawing"></script>
<style type="text/css">
  #map, html, body {
    padding: 0;
    margin: 0;
    height: 100%;
  }

  #panel {
    width: 200px;
    font-family: Arial, sans-serif;
    font-size: 13px;
    float: right;
    margin: 10px;
  }

  #color-palette {
    clear: both;
  }

  .color-button {
    width: 14px;
    height: 14px;
    font-size: 0;
    margin: 2px;
    float: left;
    cursor: pointer;
  }

  #delete-button {
    margin-top: 5px;
  }
</style>
<script type="text/javascript">
  var drawingManager;
  var selectedShape;
  var colors = ['#1E90FF', '#FF1493', '#32CD32', '#FF8C00', '#4B0082'];
  var selectedColor;
  var colorButtons = {};

  function clearSelection() {
    if (selectedShape) {
      selectedShape.setEditable(false);
      selectedShape = null;
    }
  }

  function setSelection(shape) {
    clearSelection();
    selectedShape = shape;
    shape.setEditable(true);
    selectColor(shape.get('fillColor') || shape.get('strokeColor'));
  }

  function deleteSelectedShape() {
    if (selectedShape) {
      selectedShape.setMap(null);
    }
  }

  function selectColor(color) {
    selectedColor = color;
    for (var i = 0; i < colors.length; ++i) {
      var currColor = colors[i];
      colorButtons[currColor].style.border = currColor == color ? '2px solid #789' : '2px solid #fff';
    }

    // Retrieves the current options from the drawing manager and replaces the
    // stroke or fill color as appropriate.
    var polylineOptions = drawingManager.get('polylineOptions');
    polylineOptions.strokeColor = color;
    drawingManager.set('polylineOptions', polylineOptions);

    var rectangleOptions = drawingManager.get('rectangleOptions');
    rectangleOptions.fillColor = color;
    drawingManager.set('rectangleOptions', rectangleOptions);

    var circleOptions = drawingManager.get('circleOptions');
    circleOptions.fillColor = color;
    drawingManager.set('circleOptions', circleOptions);

    var polygonOptions = drawingManager.get('polygonOptions');
    polygonOptions.fillColor = color;
    drawingManager.set('polygonOptions', polygonOptions);
  }

  function setSelectedShapeColor(color) {
    if (selectedShape) {
      if (selectedShape.type == google.maps.drawing.OverlayType.POLYLINE) {
        selectedShape.set('strokeColor', color);
      } else {
        selectedShape.set('fillColor', color);
      }
    }
  }

  function makeColorButton(color) {
    var button = document.createElement('span');
    button.className = 'color-button';
    button.style.backgroundColor = color;
    google.maps.event.addDomListener(button, 'click', function() {
      selectColor(color);
      setSelectedShapeColor(color);
    });

    return button;
  }

   function buildColorPalette() {
     var colorPalette = document.getElementById('color-palette');
     for (var i = 0; i < colors.length; ++i) {
       var currColor = colors[i];
       var colorButton = makeColorButton(currColor);
       colorPalette.appendChild(colorButton);
       colorButtons[currColor] = colorButton;
     }
     selectColor(colors[0]);
   }

  function initialize() {
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 10,
      center: new google.maps.LatLng(22.344, 114.048),
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      disableDefaultUI: true,
      zoomControl: true
    });

    var polyOptions = {
      strokeWeight: 0,
      fillOpacity: 0.45,
      editable: true
    };
    // Creates a drawing manager attached to the map that allows the user to draw
    // markers, lines, and shapes.
    drawingManager = new google.maps.drawing.DrawingManager({
      drawingMode: google.maps.drawing.OverlayType.POLYGON,
      markerOptions: {
        draggable: true
      },
      polylineOptions: {
        editable: true
      },
      rectangleOptions: polyOptions,
      circleOptions: polyOptions,
      polygonOptions: polyOptions,
      map: map
    });

    google.maps.event.addListener(drawingManager, 'overlaycomplete', function(e) {
        if (e.type != google.maps.drawing.OverlayType.MARKER) {
        // Switch back to non-drawing mode after drawing a shape.
        drawingManager.setDrawingMode(null);

        // Add an event listener that selects the newly-drawn shape when the user
        // mouses down on it.
        var newShape = e.overlay;
        newShape.type = e.type;
        google.maps.event.addListener(newShape, 'click', function() {
          setSelection(newShape);
        });
        setSelection(newShape);
      }
    });

    // Clear the current selection when the drawing mode is changed, or when the
    // map is clicked.
    google.maps.event.addListener(drawingManager, 'drawingmode_changed', clearSelection);
    google.maps.event.addListener(map, 'click', clearSelection);
    google.maps.event.addDomListener(document.getElementById('delete-button'), 'click', deleteSelectedShape);

    buildColorPalette();
  }
  google.maps.event.addDomListener(window, 'load', initialize);

到

var result = _queryExecutor.QueryWithOutputParameters<T>(queryName, sqlParameters, outputParameters);

泛型list <t>问题引起的函数重载

2 个答案: