C#呼叫js庫的方法
2023-01-17 12:01:46
前言
用.net6開發一個Winform程式，處理Excel檔案，並把結果匯出Excel檔案。
要用到兩個演演算法，一是turf.js庫的booleanPointInPolygon方法，判斷經緯度座標是否在區域內；二是經緯度糾偏演演算法，因為對方給的區域座標集合有偏移，需要糾偏。
這兩個演演算法，網上找C#的實現，一是不好找；二是找來的不信任，我還要測試以確保沒有問題。我之前做電子地圖使用過turf.js庫和js版本的糾偏演演算法，比較信任，確定沒有問題。
所以我就打算通過C#呼叫js庫的方法，來實現資料處理。
安裝ClearScript
ClearScript是微軟開源的js引擎，支援windows、linux、mac。
NuGet搜尋安裝：
Microsoft.ClearScript.Core
Microsoft.ClearScript.V8
Microsoft.ClearScript.V8.Native.win-x64
引入js檔案
把leaflet.mapCorrection.js、turf.v6.5.0.min.js和自己寫的calc.js放入工程中，右擊屬性設定複製到輸出目錄：如果較新則複製。
calc.js通過呼叫leaflet.mapCorrection.js和turf.v6.5.0.min.js中的方法實現功能，檔案內容如下：
function calc(lng, lat, polygonStr) {
var point = turf.point([lng, lat]);
var polygonPoints = JSON.parse(polygonStr);
var polygon = turf.polygon(polygonPoints);
var bl = turf.booleanPointInPolygon(point, polygon);
return bl;
}
function correct(lng, lat) {
var newPoint = new CoordConvertor().gcj02_To_gps84(lng, lat);
return newPoint;
}
建立V8ScriptEngine物件
private V8ScriptEngine _engine = new V8ScriptEngine();
通過js引擎載入js檔案
在Form1_Load方法中新增如下程式碼：
_engine.AddHostType("Console", typeof(Console));
string fileName = AppDomain.CurrentDomain.BaseDirectory + "turf.v6.5.0.min.js";
string js;
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
fileName = AppDomain.CurrentDomain.BaseDirectory + "calc.js";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
fileName = AppDomain.CurrentDomain.BaseDirectory + "leaflet.mapCorrection.js";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
C#呼叫js方法實現經緯度座標糾偏
double lng = Convert.ToDouble(lnglat[0]);
double lat = Convert.ToDouble(lnglat[1]);
//座標糾偏
dynamic newPoint = _engine.Invoke("correct", new object[] { lng, lat });
lng = newPoint.lng;
lat = newPoint.lat;
C#呼叫js方法判斷經緯度點位是否在多邊形內
//_selectedRegionPoints是多邊形座標點位集合json字串
bool bl = (bool)_engine.Invoke("calc", new object[] { lng, lat, _selectedRegionPoints });
程式開發完成後釋出
釋出後資料夾拷貝到使用者的win10系統中可以直接使用，不需要安裝.net6環境。我自己的很老的win7 sp1虛擬機器器上跑不起來，ClearScriptV8.win-x64.dll無法載入成功，暫不知道為什麼。
Form1.cs完整程式碼如下：
當時程式寫的急，當然，程式還可以優化，不過沒必要，要處理的資料量不大，功能沒問題就行。
using Models;
using Newtonsoft.Json;
using System.Drawing;
using System.Text;
using System.Text.RegularExpressions;
using Microsoft.ClearScript.JavaScript;
using Microsoft.ClearScript.V8;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.SS.UserModel;
using System.Reflection;
using System.Windows.Forms;
using NPOI.Util;
namespace 點位
{
public partial class Form1 : Form
{
private Regions _regions;
private List<CameraInfo> _cameraList = new List<CameraInfo>();
private V8ScriptEngine _engine = new V8ScriptEngine();
private string _selectedRegionPoints;
public Form1()
{
InitializeComponent();
}
private async void Form1_Load(object sender, EventArgs e)
{
//通過js引擎載入js檔案
_engine.AddHostType("Console", typeof(Console));
string fileName = AppDomain.CurrentDomain.BaseDirectory + "turf.v6.5.0.min.js";
string js;
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
fileName = AppDomain.CurrentDomain.BaseDirectory + "calc.js";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
fileName = AppDomain.CurrentDomain.BaseDirectory + "leaflet.mapCorrection.js";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
js = ASCIIEncoding.UTF8.GetString(bArr);
}
_engine.Execute(js);
//行政區劃下拉選單初始化
fileName = AppDomain.CurrentDomain.BaseDirectory + "安徽.json";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] bArr = new byte[fs.Length];
await fs.ReadAsync(bArr, 0, bArr.Length);
string json = ASCIIEncoding.UTF8.GetString(bArr);
_regions = JsonConvert.DeserializeObject<Regions>(json);
}
List<Records> citys = _regions.RECORDS.ToList().FindAll(a => a.civilcode.Length == 4);
cbxCity.DataSource = citys;
cbxCity.DisplayMember = "civilname";
cbxCity.ValueMember = "civilcode";
}
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Title = "選擇要處理的Excel檔案";
openFileDialog1.Filter = "Excel檔案(*.xlsx)|*.xlsx";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
using (FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
}
}
}
private void cbxCity_SelectedIndexChanged(object sender, EventArgs e)
{
Records record = cbxCity.SelectedItem as Records;
List<Records> citys = _regions.RECORDS.ToList().FindAll(a => a.civilcode.Length > 4 && a.civilcode.Substring(0, 4) == record.civilcode);
citys.Insert(0, new Records() { civilcode = null, civilname = "==請選擇==" });
cbxCounty.DataSource = citys;
cbxCounty.DisplayMember = "civilname";
cbxCounty.ValueMember = "civilcode";
}
private void cbxCounty_SelectedIndexChanged(object sender, EventArgs e)
{
Records record = cbxCounty.SelectedItem as Records;
if (record.civilcode == null)
{
record = cbxCity.SelectedItem as Records;
}
Regex regex = new Regex(@"^POLYGON\((\(.*\),?)*\)$");
var mc = regex.Matches(record.polygongeo);
StringBuilder sb = new StringBuilder();
foreach (Match m in mc)
{
string value = m.Groups[1].Value.TrimStart('(').TrimEnd(')');
string[] lnglatArr = value.Split(',');
bool first = true;
if (sb.Length > 0)
{
sb.Append(",");
}
sb.Append("[[");
foreach (string lnglatStr in lnglatArr)
{
string[] lnglat = lnglatStr.Trim().Split(' ');
double lng = Convert.ToDouble(lnglat[0]);
double lat = Convert.ToDouble(lnglat[1]);
//座標糾偏
dynamic newPoint = _engine.Invoke("correct", new object[] { lng, lat });
lng = newPoint.lng;
lat = newPoint.lat;
if (first)
{
first = false;
sb.AppendFormat($"[{lng}, {lat}]");
}
else
{
sb.AppendFormat($",[{lng}, {lat}]");
}
}
sb.Append("]]");
}
_selectedRegionPoints = sb.ToString();
}
private async void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
{
await Task.Delay(10);
//讀取Excel
_cameraList = new List<CameraInfo>();
using (FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
XSSFWorkbook workbook = new XSSFWorkbook(fs);
ISheet sheet = workbook.GetSheetAt(0);
for (int i = 1; i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
CameraInfo cameraInfo = new CameraInfo();
cameraInfo.CameraNo = row.GetCell(1).StringCellValue.Trim();
cameraInfo.City = row.GetCell(2).StringCellValue.Trim();
cameraInfo.County = row.GetCell(3).StringCellValue.Trim();
cameraInfo.CameraName = row.GetCell(4).StringCellValue.Trim();
cameraInfo.Lng = row.GetCell(5).StringCellValue.Trim();
cameraInfo.Lat = row.GetCell(6).StringCellValue.Trim();
cameraInfo.CameraFunType = row.GetCell(7).StringCellValue.Trim();
cameraInfo.Region = row.GetCell(8).StringCellValue.Trim();
cameraInfo.Type = row.GetCell(9).StringCellValue.Trim();
cameraInfo.Status = row.GetCell(10).StringCellValue.Trim();
cameraInfo.Mac = row.GetCell(11).StringCellValue.Trim();
cameraInfo.Ip = row.GetCell(12).StringCellValue.Trim();
_cameraList.Add(cameraInfo);
}
}
//過濾資料
_cameraList = _cameraList.FindAll(cameraInfo =>
{
if (!string.IsNullOrWhiteSpace(cameraInfo.Lng) && !string.IsNullOrWhiteSpace(cameraInfo.Lat))
{
double lng = Convert.ToDouble(cameraInfo.Lng);
double lat = Convert.ToDouble(cameraInfo.Lat);
bool bl = (bool)_engine.Invoke("calc", new object[] { lng, lat, _selectedRegionPoints });
if (bl) //區域內
{
return false;
}
else //區域外
{
return true;
}
}
else
{
return false;
}
});
saveFileDialog1.Title = "選擇處理結果要儲存的位置及檔名";
saveFileDialog1.Filter = "Excel檔案(*.xlsx)|*.xlsx";
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
if (File.Exists(saveFileDialog1.FileName))
{
File.Delete(saveFileDialog1.FileName);
}
string template = AppDomain.CurrentDomain.BaseDirectory + "點位模板.xlsx";
XSSFWorkbook workbook;
using (FileStream fs = new FileStream(template, FileMode.Open, FileAccess.Read, FileShare.Read))
{
workbook = new XSSFWorkbook(fs);
using (FileStream fs2 = new FileStream(saveFileDialog1.FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
ISheet sheet = workbook.GetSheetAt(0);
sheet.RemoveRow(sheet.GetRow(1));
sheet.RemoveRow(sheet.GetRow(2));
Dictionary<int, ICellStyle> cellStyles = GetCellStyles(sheet);
int i = 1;
foreach (CameraInfo cameraInfo in _cameraList)
{
IRow row = sheet.CreateRow(i);
ICell cell1 = row.CreateCell(1, CellType.String);
ICell cell2 = row.CreateCell(2, CellType.String);
ICell cell3 = row.CreateCell(3, CellType.String);
ICell cell4 = row.CreateCell(4, CellType.String);
ICell cell5 = row.CreateCell(5, CellType.String);
ICell cell6 = row.CreateCell(6, CellType.String);
ICell cell7 = row.CreateCell(7, CellType.String);
ICell cell8 = row.CreateCell(8, CellType.String);
ICell cell9 = row.CreateCell(9, CellType.String);
ICell cell10 = row.CreateCell(10, CellType.String);
ICell cell11 = row.CreateCell(11, CellType.String);
ICell cell12 = row.CreateCell(12, CellType.String);
SetCellStyles(row, cellStyles);
cell1.SetCellValue(cameraInfo.CameraNo);
cell2.SetCellValue(cameraInfo.City);
cell3.SetCellValue(cameraInfo.County);
cell4.SetCellValue(cameraInfo.CameraName);
cell5.SetCellValue(cameraInfo.Lng);
cell6.SetCellValue(cameraInfo.Lat);
cell7.SetCellValue(cameraInfo.CameraFunType);
cell8.SetCellValue(cameraInfo.Region);
cell9.SetCellValue(cameraInfo.Type);
cell10.SetCellValue(cameraInfo.Status);
cell11.SetCellValue(cameraInfo.Mac);
cell12.SetCellValue(cameraInfo.Ip);
i++;
}
workbook.Write(fs2);
}
MessageBox.Show("完成");
}
}
}
private Dictionary<int, ICellStyle> GetCellStyles(ISheet sheet)
{
var styleRow = sheet.GetRow(5);
Dictionary<int, ICellStyle> result = new Dictionary<int, ICellStyle>();
for (int i = 1; i <= 12; i++)
{
result.Add(i, styleRow.GetCell(i).CellStyle);
}
return result;
}
private void SetCellStyles(IRow row, Dictionary<int, ICellStyle> styles)
{
for (int i = 1; i <= 12; i++)
{
row.GetCell(i).CellStyle = styles[i];
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
_engine.Dispose();
}
private void button2_Click(object sender, EventArgs e)
{
folderBrowserDialog1.Description = "選擇模板檔案儲存位置";
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
string template = AppDomain.CurrentDomain.BaseDirectory + "點位模板.xlsx";
string filePath = Path.Combine(folderBrowserDialog1.SelectedPath, "點位模板.xlsx");
if (File.Exists(filePath))
{
if (MessageBox.Show("模板檔案已存在，是否覆蓋？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
{
File.Copy(template, filePath, true);
MessageBox.Show("下載完成");
}
}
else
{
File.Copy(template, filePath, true);
MessageBox.Show("下載完成");
}
}
}
}
}