在之前的文章中，介绍了两篇关于GMap.NET这样的开源地图控件，介绍了其一些基本信息以及如何进行初步的应用。
Winform下的地图开发控件(GMap.NET)使用心得
Winform下的地图开发控件(GMap.NET)使用心得之二
这是一个基于Winform的地图控件。该地图控件的定义如下：
GMap.NET是一个强大、免费、跨平台、开源的.NET控件，它在Windows Forms 和WPF环境中能够通过Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac等实现寻找路径、地理编码以及地图展示功能，并支持缓存和运行在Mobile环境中。
GMap.NET是一个开源的GEO地图定位和跟踪程序。就像谷歌地图、雅虎地图一样，可以自动计算两地的距离，定位经纬度，与Google地图不同的是，该项目是建立在C#语言WinForm基础上的。可以对地图放大缩小，进行城市标记等。
本文主要介绍应用该控件来批量解析地址经纬度坐标。由于项目需要，我需要把数据库里面的4千多条地址信息解析出经纬度坐标，以供其他用途。经纬度坐标不要求非常精确，大体位置准确即可。如果人工通过Googlemap或者其他途径标准，工作量非常大，而且也很枯燥。由于之前接触过该控件，知道好像比较容易能够解析获取地址的经纬度坐标，那么我们把数据库信息逐一解析即可，这样可以节省人力，更重要的是，可以避免做枯燥的工作。我们先看看程序的运行效果，然后分析如何具体编码实现。
开始一段时间的效果图：
基本完成的效果图：
代码实现如下所示，主要利用了背景工作线程BackgroundWorker来提高界面的友好响应。
private BackgroundWorker work = new BackgroundWorker();
public FrmMainMap()
{
InitializeComponent();
work.WorkerReportsProgress = true;
work.DoWork += new DoWorkEventHandler(work_DoWork);
work.RunWorkerCompleted += new RunWorkerCompletedEventHandler(work_RunWorkerCompleted);
work.ProgressChanged += new ProgressChangedEventHandler(work_ProgressChanged);
}
void work_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.progressBar.Value = e.ProgressPercentage;
this.tsslTips.Text = e.UserState.ToString();
}
private void FrmMainMap_FormClosing(object sender, FormClosingEventArgs e)
{
work.DoWork -= new DoWorkEventHandler(work_DoWork);
work.RunWorkerCompleted -= new RunWorkerCompletedEventHandler(work_RunWorkerCompleted);
}
void work_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
string tips = string.Format("更新完成, 共成功更新数据 {0} 个", e.Result);
this.tsslTips.Text = tips;
this.progressBar.Value = 100;
MessageUtil.ShowTips(tips);
}
void work_DoWork(object sender, DoWorkEventArgs e)
{
string sql = "select t.ID, t.company_addr from tbpark_enterprise t where t.company_addr is not null and t.latitude is null ";
Database db = DatabaseFactory.CreateDatabase();
DbCommand command = db.GetSqlStringCommand(sql);
Dictionary<int, string> addrList = new Dictionary<int, string>();
using (IDataReader dr = db.ExecuteReader(command))
{
SmartDataReader reader = new SmartDataReader(dr);
while (reader.Read())
{
int id = reader.GetInt32("ID");
string addr = reader.GetString("company_addr");
work.ReportProgress(10, string.Format("正在处理地址[ {0} ]", addr));
if (!string.IsNullOrEmpty(addr))
{
int sindex = addr.IndexOfAny(new char[] { '（', '(' });
if (sindex > 0)
{
addr = addr.Substring(0, sindex);
}
if (!addrList.ContainsKey(id))
{
addrList.Add(id, addr);
}
}
}
}
work.ReportProgress(20, string.Format("获取列表地址信息结束，正在获取Google地图坐标..."));
int totoal = addrList.Count;
double step = Convert.ToDouble(100) / totoal;
int i = 1;
int successCount = 0;
foreach (int id in addrList.Keys)
{
int percent = Convert.ToInt32(step * i);
work.ReportProgress(percent, string.Format("正在获取Google地图坐标...,已成功获取 {0} 个", successCount));
try
{
string addr = addrList[id];
GeoCoderStatusCode unknow = GeoCoderStatusCode.Unknow;
PointLatLng? latLngFromGeocoder = Singleton<GMaps>.Instance.GetLatLngFromGeocoder(addr, out unknow);
if (latLngFromGeocoder.HasValue && (unknow == GeoCoderStatusCode.G_GEO_SUCCESS))
{
PointLatLng latLng = latLngFromGeocoder.Value;
sql = string.Format("Update tbpark_enterprise t set t.LATITUDE={0}, t.LONGITUDE={1} where t.ID={2}",
latLng.Lat, latLng.Lng, id);
command = db.GetSqlStringCommand(sql);
bool success = db.ExecuteNonQuery(command) > 0;
if (success)
{
successCount++;
}
}
else
{
LogHelper.Info(unknow.ToString());
}
}
catch (Exception ex)
{
LogHelper.Error(ex);
}
i++;
}
e.Result = successCount;
}
public FrmMainMap()
{
InitializeComponent();
work.WorkerReportsProgress = true;
work.DoWork += new DoWorkEventHandler(work_DoWork);
work.RunWorkerCompleted += new RunWorkerCompletedEventHandler(work_RunWorkerCompleted);
work.ProgressChanged += new ProgressChangedEventHandler(work_ProgressChanged);
}
void work_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.progressBar.Value = e.ProgressPercentage;
this.tsslTips.Text = e.UserState.ToString();
}
private void FrmMainMap_FormClosing(object sender, FormClosingEventArgs e)
{
work.DoWork -= new DoWorkEventHandler(work_DoWork);
work.RunWorkerCompleted -= new RunWorkerCompletedEventHandler(work_RunWorkerCompleted);
}
void work_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
string tips = string.Format("更新完成, 共成功更新数据 {0} 个", e.Result);
this.tsslTips.Text = tips;
this.progressBar.Value = 100;
MessageUtil.ShowTips(tips);
}
void work_DoWork(object sender, DoWorkEventArgs e)
{
string sql = "select t.ID, t.company_addr from tbpark_enterprise t where t.company_addr is not null and t.latitude is null ";
Database db = DatabaseFactory.CreateDatabase();
DbCommand command = db.GetSqlStringCommand(sql);
Dictionary<int, string> addrList = new Dictionary<int, string>();
using (IDataReader dr = db.ExecuteReader(command))
{
SmartDataReader reader = new SmartDataReader(dr);
while (reader.Read())
{
int id = reader.GetInt32("ID");
string addr = reader.GetString("company_addr");
work.ReportProgress(10, string.Format("正在处理地址[ {0} ]", addr));
if (!string.IsNullOrEmpty(addr))
{
int sindex = addr.IndexOfAny(new char[] { '（', '(' });
if (sindex > 0)
{
addr = addr.Substring(0, sindex);
}
if (!addrList.ContainsKey(id))
{
addrList.Add(id, addr);
}
}
}
}
work.ReportProgress(20, string.Format("获取列表地址信息结束，正在获取Google地图坐标..."));
int totoal = addrList.Count;
double step = Convert.ToDouble(100) / totoal;
int i = 1;
int successCount = 0;
foreach (int id in addrList.Keys)
{
int percent = Convert.ToInt32(step * i);
work.ReportProgress(percent, string.Format("正在获取Google地图坐标...,已成功获取 {0} 个", successCount));
try
{
string addr = addrList[id];
GeoCoderStatusCode unknow = GeoCoderStatusCode.Unknow;
PointLatLng? latLngFromGeocoder = Singleton<GMaps>.Instance.GetLatLngFromGeocoder(addr, out unknow);
if (latLngFromGeocoder.HasValue && (unknow == GeoCoderStatusCode.G_GEO_SUCCESS))
{
PointLatLng latLng = latLngFromGeocoder.Value;
sql = string.Format("Update tbpark_enterprise t set t.LATITUDE={0}, t.LONGITUDE={1} where t.ID={2}",
latLng.Lat, latLng.Lng, id);
command = db.GetSqlStringCommand(sql);
bool success = db.ExecuteNonQuery(command) > 0;
if (success)
{
successCount++;
}
}
else
{
LogHelper.Info(unknow.ToString());
}
}
catch (Exception ex)
{
LogHelper.Error(ex);
}
i++;
}
e.Result = successCount;
}
上面最为关键的部分代码就是如何解析地址为坐标的操作，判断如果解析成功，则获取相应的地理坐标即可，是下面这段：
string addr = addrList[id];
GeoCoderStatusCode unknow = GeoCoderStatusCode.Unknow;
PointLatLng? latLngFromGeocoder = Singleton<GMaps>.Instance.GetLatLngFromGeocoder(addr, out unknow);
if (latLngFromGeocoder.HasValue && (unknow == GeoCoderStatusCode.G_GEO_SUCCESS))
{
PointLatLng latLng = latLngFromGeocoder.Value;
sql = string.Format("Update tbpark_enterprise t set t.LATITUDE={0}, t.LONGITUDE={1} where t.ID={2}",
latLng.Lat, latLng.Lng, id);
command = db.GetSqlStringCommand(sql);
bool success = db.ExecuteNonQuery(command) > 0;
if (success)
{
successCount++;
}
}
GeoCoderStatusCode unknow = GeoCoderStatusCode.Unknow;
PointLatLng? latLngFromGeocoder = Singleton<GMaps>.Instance.GetLatLngFromGeocoder(addr, out unknow);
if (latLngFromGeocoder.HasValue && (unknow == GeoCoderStatusCode.G_GEO_SUCCESS))
{
PointLatLng latLng = latLngFromGeocoder.Value;
sql = string.Format("Update tbpark_enterprise t set t.LATITUDE={0}, t.LONGITUDE={1} where t.ID={2}",
latLng.Lat, latLng.Lng, id);
command = db.GetSqlStringCommand(sql);
bool success = db.ExecuteNonQuery(command) > 0;
if (success)
{
successCount++;
}
}
本文转自博客园伍华聪的博客，原文链接：Winform下的地图开发控件(GMap.NET)使用心得之三---批量解析地址经纬度坐标，如需转载请自行联系原博主。