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SharpMap V1.1 For Web教程系列之——地图展示

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11/30
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开篇先说本次的开发环境吧。采用Vs2010，.Net Framework 4.0。

为了更好的调试程序，建议在IIS中进行调试及运行，个人非常不喜欢利用VS自己提供的WebServer去调试程序，而且很多在Web.config中的设置也需要在IIS中才能起到效果！

开发环境我就不要介绍了，先来说说SharpMap的组件要求吧。由于SharpMap的架构一直在变化和改进过程中，因此参考网络上别人的事例代码，你会发现都运行不起来，不是接口没了，就是命名空间变了，这点我也希望SharpMap早日稳定下来。

这次使用的 SharpMap 的版本是V1.1版本，官方意见提供最新稳定版的下载了，官方网址为：http://sharpmap.codeplex.com/

SharpMap 1.1版本的下载地址为：http://sharpmap.codeplex.com/downloads/get/792797​，发布时间为2014年12月11日；该版本只是SharpMap的核心库(Core+UI),下载完后，为了Web开发还必须下载一个Web端的库，本人做完因为这一步走了好多弯路，网络上的教程也没有人写上着一点。在官网的DOWNLOADS节点下有个下载界面，需要下载 SharpMap.Web 这个组件。

OK!所需库完成后，下面进行Asp.Net的网站开发！你也可以不看下面的代码，直接下载整个网站。解决方案下载地址： http://pan.baidu.com/s/1i3vdUcd

打开VS2010,新建一个网站，​新建一个WebForm，我这里命名为“Map.aspx”，下面贴代码：

Map.aspx:地图展示页面 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Map.aspx.cs" Inherits="Map" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>SharpMap测试</title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:RadioButtonList ID="rblMapTools" runat="server" RepeatDirection="Horizontal">

            <asp:ListItem Value="">Zoom in</asp:ListItem>

            <asp:ListItem Value="">Zoom out</asp:ListItem>

            <asp:ListItem Value="" Selected="True">Pan</asp:ListItem>

        </asp:RadioButtonList>

        <asp:ImageButton runat="server" Width="" Height="" ID="imgMap"

            onclick="imgMap_Click" />

    </div>

    </form>

</body>

</html>

Map.aspx.cx: 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Map : System.Web.UI.Page

{

    private SharpMap.Map myMap;

    protected void Page_Load(object sender, EventArgs e)

    {

        myMap = MapHelper.InitializeMap(new System.Drawing.Size((int)imgMap.Width.Value, (int)imgMap.Height.Value));

        //SharpMap.Map

        if (this.IsPostBack)

        {

            myMap.Center = (GeoAPI.Geometries.Coordinate)ViewState["mapCenter"];

            myMap.Zoom = (double)ViewState["mapZoom"];

        }

        else

        {

            this.generateMap();

        }

    }

    protected void imgMap_Click(object sender, ImageClickEventArgs e)

    {

        myMap.Center = myMap.ImageToWorld(new System.Drawing.Point(e.X, e.Y));

        //Set zoom value if any of the zoom tools were selected

        if (rblMapTools.SelectedValue == "0") //Zoom in

            myMap.Zoom = myMap.Zoom * 0.5;

        else if (rblMapTools.SelectedValue == "1") //Zoom out

            myMap.Zoom = myMap.Zoom * 2;

        //Create the map

        this.generateMap();

    }

    private void generateMap()

    {

        ViewState.Add("mapCenter", myMap.Center);

        ViewState.Add("mapZoom", myMap.Zoom);

        //myMap = MapHelper.InitializeMap(new System.Drawing.Size(256, 256));

        System.Drawing.Image img = myMap.GetMap();

        string imgID = SharpMap.Web.Caching.InsertIntoCache(1, img);

        imgMap.ImageUrl = "getmap.aspx?ID=" + HttpUtility.UrlEncode(imgID);

    }

}

Web.Config配置文件，在.Net 4.0下配置文件，红色部分表示这个地方和SharpMap官网以及互联网上很多教程里面的区别。 

<?xml version="1.0"?>

<configuration>

  <system.web>

    <compilation debug="true" targetFramework="4.0" />

  </system.web>

  <system.webServer>

     <modules runAllManagedModulesForAllRequests="true"/>

      <handlers>

          <add verb="*" name="test" path="GetMap.aspx" type="SharpMap.Web.HttpHandler" preCondition="integratedMode"/>

      </handlers>

      <validation validateIntegratedModeConfiguration="false" />

  </system.webServer>

</configuration>

MapHelper.cs 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using SharpMap;

using System.Drawing;

using SharpMap.Layers;

using SharpMap.Data.Providers;

using SharpMap.Styles;

using System.Drawing.Text;

using SharpMap.Rendering;

using ColorBlend=SharpMap.Rendering.Thematics.ColorBlend;

using Point=GeoAPI.Geometries.Coordinate;

using System.Drawing.Drawing2D;

/// <summary>

/// Summary description for MapHelper

/// </summary>

public class MapHelper

{

    public MapHelper()

    {

    }

    public static Map InitializeMap(Size size)

    {

        HttpContext.Current.Trace.Write("Initializing map...");

        //Initialize a new map of size 'imagesize'

        Map map = new Map(size);

        //Set up the countries layer

        VectorLayer layCountries = new VectorLayer("Countries");

        //Set the datasource to a shapefile in the App_data folder

        layCountries.DataSource = new ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\countries.shp"), true);

        //Set fill-style to green

        layCountries.Style.Fill = new SolidBrush(Color.Green);

        //Set the polygons to have a black outline

        layCountries.Style.Outline = Pens.Black;

        layCountries.Style.EnableOutline = true;

        layCountries.SRID = ;

        //Set up a river layer

        VectorLayer layRivers = new VectorLayer("Rivers");

        //Set the datasource to a shapefile in the App_data folder

        layRivers.DataSource = new ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\rivers.shp"), true);

        //Define a blue 1px wide pen

        layRivers.Style.Line = new Pen(Color.Blue, );

        layRivers.SRID = ;

        //Set up a river layer

        VectorLayer layCities = new VectorLayer("Cities");

        //Set the datasource to a shapefile in the App_data folder

        layCities.DataSource = new ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\cities.shp"), true);

        //Define a blue 1px wide pen

        //layCities.Style.Symbol = new Bitmap(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\icon.png"));

        layCities.Style.SymbolScale = 0.8f;

        layCities.MaxVisible = ;

        layCities.SRID = ;

        //Set up a country label layer

        LabelLayer layLabel = new LabelLayer("Country labels");

        layLabel.DataSource = layCountries.DataSource;

        layLabel.Enabled = true;

        layLabel.LabelColumn = "Name";

        layLabel.Style = new LabelStyle();

        layLabel.Style.ForeColor = Color.White;

        layLabel.Style.Font = new Font(FontFamily.GenericSerif, );

        layLabel.Style.BackColor = new SolidBrush(Color.FromArgb(, , , ));

        layLabel.MaxVisible = ;

        layLabel.MinVisible = ;

        layLabel.Style.HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center;

        layLabel.SRID = ;

        layLabel.MultipartGeometryBehaviour = LabelLayer.MultipartGeometryBehaviourEnum.Largest;

        //Set up a city label layer

        LabelLayer layCityLabel = new LabelLayer("City labels");

        layCityLabel.DataSource = layCities.DataSource;

        layCityLabel.Enabled = true;

        layCityLabel.LabelColumn = "Name";

        layCityLabel.Style = new LabelStyle();

        layCityLabel.Style.ForeColor = Color.Black;

        layCityLabel.Style.Font = new Font(FontFamily.GenericSerif, );

        layCityLabel.MaxVisible = layLabel.MinVisible;

        layCityLabel.Style.HorizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Left;

        layCityLabel.Style.VerticalAlignment = LabelStyle.VerticalAlignmentEnum.Bottom;

        layCityLabel.Style.Offset = new PointF(, );

        layCityLabel.Style.Halo = new Pen(Color.Yellow, );

        layCityLabel.TextRenderingHint = TextRenderingHint.AntiAlias;

        layCityLabel.SmoothingMode = SmoothingMode.AntiAlias;

        layCityLabel.SRID = ;

        layCityLabel.LabelFilter = LabelCollisionDetection.ThoroughCollisionDetection;

        layCityLabel.Style.CollisionDetection = true;

        //Add the layers to the map object.

        //The order we add them in are the order they are drawn, so we add the rivers last to put them on top

        map.Layers.Add(layCountries);

        map.Layers.Add(layRivers);

        map.Layers.Add(layCities);

        map.Layers.Add(layLabel);

        map.Layers.Add(layCityLabel);

        //limit the zoom to 360 degrees width

        map.MaximumZoom = ;

        map.BackColor = Color.LightBlue;

        map.Zoom = ;

        map.Center = new Point(, );

        HttpContext.Current.Trace.Write("Map initialized");

        return map;

    }

    public static Map InitializeTaiyuanMap(Size size)

    {

        HttpContext.Current.Trace.Write("Initializing map...");

        //Initialize a new map of size 'imagesize'

        SharpMap.Map map = new SharpMap.Map(size);

        //设置太原市区域图层

        SharpMap.Layers.VectorLayer layTy = new SharpMap.Layers.VectorLayer("ty");

        layTy.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\区县级行政区划R.shp"), true);

        layTy.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        layTy.Style.Outline = System.Drawing.Pens.Black;

        layTy.Style.EnableOutline = true;

        layTy.SRID = ;

        //设置镇的图层

        SharpMap.Layers.VectorLayer layZ = new SharpMap.Layers.VectorLayer("z");

        layZ.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\镇.shp"), true);

        layZ.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        layZ.Style.Outline = System.Drawing.Pens.Black;

        layZ.Style.EnableOutline = true;

        layZ.SRID = ;

        //设置河流的图层

        SharpMap.Layers.VectorLayer layHl = new SharpMap.Layers.VectorLayer("Hl");

        layHl.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\河流湖泊R.shp"), true);

        layHl.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        layHl.Style.Outline = System.Drawing.Pens.Black;

        layHl.Style.EnableOutline = true;

        layHl.SRID = ;

        //设置国道的图层

        SharpMap.Layers.VectorLayer layGd = new SharpMap.Layers.VectorLayer("gd");

        layGd.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\国道L.shp"), true);

        layGd.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        layZ.Style.Outline = System.Drawing.Pens.Black;

        layZ.Style.EnableOutline = true;

        layGd.Style.Line = new Pen(Color.FromArgb(, , ), );

        layGd.SRID = ;

        //Set up the countries layer

        SharpMap.Layers.VectorLayer laySd = new SharpMap.Layers.VectorLayer("sd");

        //Set the datasource to a shapefile in the App_data folder

        laySd.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\省道L.shp"), true);

        //Set fill-style to green

        laySd.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        //Set the polygons to have a black outline

        laySd.Style.Line = new Pen(Color.FromArgb(, , ), );

        layZ.Style.Outline = System.Drawing.Pens.Gainsboro;

        layZ.Style.EnableOutline = true;

        laySd.SRID = ;

        //Set up a river layer

        SharpMap.Layers.VectorLayer layRivers = new SharpMap.Layers.VectorLayer("Rivers");

        //Set the datasource to a shapefile in the App_data folder

        layRivers.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\城市主干道L.shp"), true);

        layRivers.Style.Fill = new SolidBrush(Color.FromArgb(, , ));

        //Define a blue 1px wide pen

        layRivers.Style.Line = new Pen(Color.FromArgb(, , ), );

        layRivers.SRID = ;

        //Set up a river layer

        SharpMap.Layers.VectorLayer layCities = new SharpMap.Layers.VectorLayer("Cities");

        //Set the datasource to a shapefile in the App_data folder

        layCities.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\城市次干道L.shp"), true);

        //Define a blue 1px wide pen

        //layCities.Style.Symbol = new Bitmap(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\icon.png"));

        layCities.Style.SymbolScale = 0.8f;

        layCities.MaxVisible = 0.2;

        layCities.SRID = ;

        //Set up a river layer

        SharpMap.Layers.VectorLayer layDb = new SharpMap.Layers.VectorLayer("db");

        //Set the datasource to a shapefile in the App_data folder

        layDb.DataSource = new SharpMap.Data.Providers.ShapeFile(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\基础地标.shp"), true);

        //Define a blue 1px wide pen

        //layCities.Style.Symbol = new Bitmap(HttpContext.Current.Server.MapPath(@"~\App_data\Taiyuan\icon.png"));

        layDb.Style.SymbolScale = 0.8f;

        layDb.MaxVisible = 0.05;

        layDb.SRID = ;

        //Set up a 镇 label layer

        SharpMap.Layers.LabelLayer layZLabel = new SharpMap.Layers.LabelLayer("tyz labels");

        layZLabel.DataSource = layZ.DataSource;

        layZLabel.Enabled = true;

        layZLabel.LabelColumn = "Name";

        layZLabel.Style = new SharpMap.Styles.LabelStyle();

        layZLabel.Style.ForeColor = Color.White;

        layZLabel.Style.Font = new Font(FontFamily.GenericSerif, );

        layZLabel.Style.BackColor = new System.Drawing.SolidBrush(Color.Black);

        layZLabel.MaxVisible = 0.1;

        layZLabel.MinVisible = 0.05;

        layZLabel.Style.HorizontalAlignment = SharpMap.Styles.LabelStyle.HorizontalAlignmentEnum.Center;

        layZLabel.SRID = ;

        layZLabel.MultipartGeometryBehaviour = SharpMap.Layers.LabelLayer.MultipartGeometryBehaviourEnum.Largest;

        //Set up a city label layer

        SharpMap.Layers.LabelLayer layCityLabel = new SharpMap.Layers.LabelLayer("City labels");

        layCityLabel.DataSource = layCities.DataSource;

        layCityLabel.Enabled = true;

        layCityLabel.LabelColumn = "Name";

        layCityLabel.Style = new SharpMap.Styles.LabelStyle();

        layCityLabel.Style.ForeColor = Color.Black;

        layCityLabel.Style.Font = new Font(FontFamily.GenericSerif, );

        layCityLabel.MaxVisible = layZLabel.MinVisible;

        layCityLabel.Style.HorizontalAlignment = SharpMap.Styles.LabelStyle.HorizontalAlignmentEnum.Left;

        layCityLabel.Style.VerticalAlignment = SharpMap.Styles.LabelStyle.VerticalAlignmentEnum.Bottom;

        layCityLabel.Style.Offset = new PointF(, );

        layCityLabel.Style.Halo = new Pen(Color.Yellow, );

        layCityLabel.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;

        layCityLabel.SmoothingMode = SmoothingMode.AntiAlias;

        layCityLabel.SRID = ;

        layCityLabel.LabelFilter = SharpMap.Rendering.LabelCollisionDetection.ThoroughCollisionDetection;

        layCityLabel.Style.CollisionDetection = true;

        //Set up a city label layer

        SharpMap.Layers.LabelLayer layDbLabel = new SharpMap.Layers.LabelLayer("Db labels");

        layDbLabel.DataSource = layDb.DataSource;

        layDbLabel.Enabled = true;

        layDbLabel.LabelColumn = "Name";

        layDbLabel.Style = new SharpMap.Styles.LabelStyle();

        layDbLabel.Style.ForeColor = Color.Black;

        layDbLabel.Style.Font = new Font(FontFamily.GenericSerif, );

        layDbLabel.MaxVisible = layCityLabel.MinVisible;

        layDbLabel.Style.HorizontalAlignment = SharpMap.Styles.LabelStyle.HorizontalAlignmentEnum.Left;

        layDbLabel.Style.VerticalAlignment = SharpMap.Styles.LabelStyle.VerticalAlignmentEnum.Bottom;

        layDbLabel.Style.Offset = new PointF(, );

        layDbLabel.Style.Halo = new Pen(Color.Yellow, );

        layDbLabel.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;

        layDbLabel.SmoothingMode = SmoothingMode.AntiAlias;

        layDbLabel.SRID = ;

        layDbLabel.LabelFilter = SharpMap.Rendering.LabelCollisionDetection.ThoroughCollisionDetection;

        layCityLabel.Style.CollisionDetection = true;

        //Add the layers to the map object.

        //The order we add them in are the order they are drawn, so we add the rivers last to put them on top

        map.Layers.Add(layTy);

        map.Layers.Add(layHl);

        map.Layers.Add(layGd);

        map.Layers.Add(laySd);

        map.Layers.Add(layRivers);

        map.Layers.Add(layCities);

        map.Layers.Add(layDb);

        map.Layers.Add(layZLabel);

        map.Layers.Add(layCityLabel);

        map.Layers.Add(layDbLabel);

        //limit the zoom to 360 degrees width

        map.MaximumZoom = ;

        map.BackColor = Color.White;

        map.Zoom = ;

        //map.Center = new SharpMap.Geometries.Point(0, 0);

        map.Center = new Point(112.48, 37.86);

        HttpContext.Current.Trace.Write("Map initialized");

        return map;

    }

}

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