我试图在MKMapView中绘制以下GeoJSON数据。
GeoJSON文件如下。
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"Name": "line1"
},
"geometry": {
"type": "LineString",
"coordinates": [
[
76.35498046875,
25.145284610685064
],
[
81.36474609375,
25.06569718553588
],
[
83.91357421875,
23.301901124188877
],
[
82.001953125,
22.004174972902003
],
[
78.33251953125,
21.248422235627014
],
[
76.31103515625,
21.268899719967695
]
]
}
},
{
"type": "Feature",
"properties": {
"Name": "point8"
},
"geometry": {
"type": "Point",
"coordinates": [
74.50927734375,
20.076570104545173
]
}
}
]
}
但我无法解析它。请帮忙。是否有任何第三方SDK可用于执行此操作。
我已经在Swift 3中编写了如下代码
func loadJSON() {
var features = [Feature]()
guard let url = Bundle.main.url(forResource: "Geo", withExtension: "json") else {
return
}
do {
let data = try Data(contentsOf: url)
guard let rootObject = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String : Any] else {
return
}
guard let featureObjects = rootObject["features"] as? [[String: AnyObject]] else {
return
}
for feature in featureObjects {
if let type = feature["type"] as? String,
let propertyObject = feature["properties"] as? [String : String],
let geometryObject = feature["geometry"] as? [String : AnyObject] {
var properties: PropertyVal?
for property in propertyObject.values {
properties = PropertyVal(name: property)
}
var geometries: Geometry?
var coordData: [Coordinates]?
var coord: Coordinates
var typeData: String = ""
for obj in geometryObject.values {
print(obj)
if let type = obj as? String {
typeData = type
} else {
//return
}
if let coordObj = obj as? [Double] {
coord = Coordinates(latitude: coordObj[0], longitude: coordObj[1])
coordData?.append(coord)
} else {
//return
}
geometries = Geometry(type: typeData, coordinates: coordData!)
}
let feature = Feature(type: type, properties: properties!, geometry: geometries!)
features.append(feature)
print("Feature is \(features)")
}
}
} catch {
}
}
}
但这不起作用。
答案 0 :(得分：1)
在class excelTwosheetsBulk1
{
private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
static void Main(string[] args)
{
log4net.Config.BasicConfigurator.Configure();
ILog log = log4net.LogManager.GetLogger(typeof(excelTwosheetsBulk1));
log.Info("Connection to database started.");
string path = string.Empty;
SqlConnection con;
con = new SqlConnection(Properties.Settings.Default.charterConnection);
//SqlConnection _con = new SqlConnection(con);
string tableName = string.Empty;
log.Info("Filepath has to be uploaded....");
Console.WriteLine("Please enter complete file path including name : ");
path = Console.ReadLine();
log.Info("File has uploaded....");
try
{
if (path == "")
{
log.Info("File has not uploaded.");
Console.WriteLine("Please upload file path......");
Console.ReadLine();
}
else
{
log.Info("Binding excel data to datatable event started.");
DataSet ds = ReadExcelFile(path);
log.Info("Binding excel data to datatable event ended.");
for (int tableCount = 0; tableCount < ds.Tables.Count; tableCount++)
{
if (ds.Tables[tableCount].TableName.Contains("'"))
{
ds.Tables[tableCount].TableName = ds.Tables[tableCount].TableName.Replace("'", "");
}
if (ds.Tables[tableCount].TableName.Contains(" "))
{
ds.Tables[tableCount].TableName = ds.Tables[tableCount].TableName.Replace(" ", "");
}
if (ds.Tables[tableCount].TableName.EndsWith("$"))
{
ds.Tables[tableCount].TableName = ds.Tables[tableCount].TableName.Replace("$", "");
}
if (ds.Tables[tableCount].TableName.EndsWith(" "))
{
ds.Tables[tableCount].TableName = ds.Tables[tableCount].TableName.Replace(" ", "");
}
}
for (int i = 0; i < ds.Tables.Count; i++)
{
log.Info("Creation of datatable in database.");
string result = string.Empty;
int tableCount = CheckTable(ds.Tables[i].TableName, con);
if (tableCount > 0)
{
result = CreateTableStatement(ds.Tables[i].TableName + "_" + DateTime.Now.ToString("MMddyyyy"), ds.Tables[i]);
}
else
{
result = CreateTableStatement(ds.Tables[i].TableName, ds.Tables[i]);
}
con.Open();
using (var command = new SqlCommand(result, con))
{
var r = command.ExecuteNonQuery();
}
SqlBulkCopy bulkCopy = new SqlBulkCopy(con, SqlBulkCopyOptions.TableLock | SqlBulkCopyOptions.FireTriggers | SqlBulkCopyOptions.UseInternalTransaction, null);
bulkCopy.DestinationTableName = ds.Tables[i].TableName;
bulkCopy.WriteToServer(ds.Tables[i]);
tableName += result + ",";
con.Close();
}
log.Info("Excel data imported successfully into datatable.");
Console.WriteLine("Table " + tableName.Trim(',') + " imported successfully.");
}
}
catch (Exception ex)
{
log.Error("Exception occoured at : " + ex.Message);
Console.WriteLine("Table " + "" + " has error while importing.");
}
Console.Read();
}
private static string CreateTableStatement(string tableName, DataTable table)
{
log.Info("Assigning parameters to columns.");
string sqlsc;
sqlsc = "CREATE TABLE " + tableName + "(";
for (int i = 0; i < table.Columns.Count; i++)
{
sqlsc += "\n [" + table.Columns[i].ColumnName + "] ";
string columnType = table.Columns[i].DataType.ToString();
switch (columnType)
{
case "System.Int32":
sqlsc += " int ";
break;
case "System.Int64":
sqlsc += " bigint ";
break;
case "System.Int16":
sqlsc += " smallint";
break;
case "System.Byte":
sqlsc += " tinyint";
break;
case "System.Decimal":
sqlsc += " decimal ";
break;
case "System.DateTime":
sqlsc += " datetime ";
break;
case "System.String":
default:
sqlsc += string.Format(" nvarchar({0}) ", table.Columns[i].MaxLength == -1 ? "max" : table.Columns[i].MaxLength.ToString());
break;
}
if (table.Columns[i].AutoIncrement)
sqlsc += " IDENTITY(" + table.Columns[i].AutoIncrementSeed.ToString() + "," + table.Columns[i].AutoIncrementStep.ToString() + ") ";
if (!table.Columns[i].AllowDBNull)
sqlsc += " NOT NULL ";
sqlsc += ",";
}
return sqlsc.Substring(0, sqlsc.Length - 1) + "\n)";
}
public static DataSet ReadExcelFile(string path)
{
DataSet ds = new DataSet();
string connString = "";
try
{
if (path.Trim().EndsWith(".xlx"))
{
log.Info("Finding excel type file.");
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
}
else if (path.Trim().EndsWith(".xlsx"))
{
log.Info("Finding excel type file.");
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=\"Excel 12.0 Xml;HDR=Yes;IMEX=1;\"";
}
//string connectionString = GetConnectionString(path);
using (OleDbConnection conn = new OleDbConnection(connString))
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
// Get all Sheets in Excel File
log.Info("Appending names to datatable.");
DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
// Loop through all Sheets to get data
foreach (DataRow dr in dtSheet.Rows)
{
log.Info("Binding excel data to datatable in sql.");
string sheetName = dr["TABLE_NAME"].ToString();
string x = sheetName.Substring(1, sheetName.Length - 2);
//string x = sheetName.Trim(' ').ToString();
if (!x.EndsWith("$"))
continue;
// Get all rows from the Sheet
cmd.CommandText = "SELECT * FROM [" + sheetName + "]";
DataTable dt = new DataTable();
dt.TableName = sheetName;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
Console.WriteLine("Binding excel data to datatable.");
da.Fill(dt);
ds.Tables.Add(dt);
}
cmd = null;
conn.Close();
}
}
catch (Exception ex)
{
log.Info("Error occurred at :" + ex.Message);
Console.WriteLine("Unable to fetch excel data.");
Console.ReadLine();
}
log.Info("Excel data has binded to datatable.");
return ds;
}
private static int CheckTable(string p, SqlConnection con)
{
string result = "SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'dbo' AND TABLE_NAME = '" + p + "'";
con.Open();
var cmd = new SqlCommand(result, con);
cmd.CommandText = result;
Int32 count = (Int32)cmd.ExecuteScalar();
con.Close();
return count;
}
public static string GetConnectionString(string path)
{
Dictionary<string, string> props = new Dictionary<string, string>();
props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
props["Extended Properties"] = "Excel 12.0 XML";
props["Data Source"] = path;
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, string> prop in props)
{
sb.Append(prop.Key);
sb.Append('=');
sb.Append(prop.Value);
sb.Append(';');
}
return sb.ToString();
}
}
您的features密钥具有2D数组的第一个字典中，您还需要在coordinates for循环中再添加一个if let条件。
geometryObject.values