试图绘制多段线导致错误C#Web应用程序 [英] Trying To Draw polyline Resulting in Error C# Web App

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问题描述

我想绘制折线,但是在重载方法中有一些错误,我无法得到它为什么导致错误,当我正确地做它时...我的代码,

  private void BuildScript(DataTable tbl)
{
String Locations =;
String locations =;
foreach(DataRow in tbl.Rows)
{
//绕过空行
if(r [Latitude]。ToString()。Trim()。Length = = 0)
continue;

字符串Latitude = r [Latitude]。ToString();
string Longitude = r [Longitude]。ToString();
double latitude = Convert.ToDouble(r [Latitude]);
double longitude = Convert.ToDouble(r [Longitude]);
var points = new List< GLatLng> {new GLatLng(纬度,经度)};
var polyline = new GPolyline(points);
//为此记录在地图上为标记创建一行JavaScript
Locations + = Environment.NewLine +map.addOverlay(new GMarker(new GLatLng(+ Latitude +,+ Longitude + )));;
locations + = Environment.NewLine +map.addOverlay(new GPolyline(new GLatLng(+ Latitude +,+ Longitude +)));;
}

//构建最终脚本
js.Text = @< script type ='text / javascript'>
function initialize(){
if(GBrowserIsCompatible()){
var map = new GMap2(document.getElementById('map_canvas'));
map.setCenter(new GLatLng(45.05,7.6667),2);
+ Locations + @
map.setUIToDefault();
}
}
< / script>;
js.Text = @< script type ='text / javascript'>
function initialize(){
if(GBrowserIsCompatible()){
var map = new GMap2(document.getElementById('map_canvas'));
map.setCenter(new GLatLng(45.05,7.6667),2);
+ locations + @
map.setUIToDefault() ;
}
}
< / script>;

$ / code>

现在它给了我脚本折线错误,

希望得到您的回复......

解决方案

GPolyline构造函数需要一个变量 List< GLatLng> ,这不是你传入的内容。



您需要创建GLatLng值作为列表:

  var points = new List< GLatLng> {新的GLatLng(59.6919,17.8582),新的GLatLng(59.3030,18.0395),新的GLatLng(58.9789,17.5341)}; 
var polyline = new GPolyline(points,#ff0000,1);


I am trying to draw polyline but there is some error in in overloading method which i can not get why it is resulting in error when i am doing it correctly... my code,

   private void BuildScript(DataTable tbl)
        {
            String Locations = "";
            String locations = "";
            foreach (DataRow r in tbl.Rows)
            {
                // bypass empty rows        
                if (r["Latitude"].ToString().Trim().Length == 0)
                    continue;

                string Latitude = r["Latitude"].ToString();
                string Longitude = r["Longitude"].ToString();
                double latitude = Convert.ToDouble(r["Latitude"]);
                double longitude =Convert.ToDouble(r["Longitude"]);
                var points = new List<GLatLng> {new GLatLng(latitude,longitude)};
                var polyline = new GPolyline(points); 
                // create a line of JavaScript for marker on map for this record    
                Locations += Environment.NewLine + " map.addOverlay(new GMarker(new GLatLng(" + Latitude + "," + Longitude + ")));";
                locations += Environment.NewLine + " map.addOverlay(new GPolyline(new GLatLng(" + Latitude + "," + Longitude + ")));";
            }

            // construct the final script
            js.Text = @"<script type='text/javascript'>
                            function initialize() {
                              if (GBrowserIsCompatible()) {
                                var map = new GMap2(document.getElementById('map_canvas'));
                                map.setCenter(new GLatLng(45.05,7.6667), 2); 
                                " + Locations + @"
                                map.setUIToDefault();
                              }
                            }
                            </script> ";
   js.Text = @"<script type='text/javascript'>
                            function initialize() {
                              if (GBrowserIsCompatible()) {
                                var map = new GMap2(document.getElementById('map_canvas'));
                                map.setCenter(new GLatLng(45.05,7.6667), 2); 
                                " + locations + @"
                                map.setUIToDefault();
                              }
                            }
                            </script> ";
}

now it is giving me error in script polyline does not exsis

Hopes for your reply ...

解决方案

The GPolyline constructor requires a variable of the type List<GLatLng> and that's not what your are passing in.

You need to create your GLatLng values as a List:

var points = new List<GLatLng> { new GLatLng(59.6919, 17.8582),new GLatLng(59.3030, 18.0395),new GLatLng(58.9789, 17.5341) };
var polyline = new GPolyline(points,"#ff0000",1); 

这篇关于试图绘制多段线导致错误C#Web应用程序的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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