用postGIS向postgresql插入空间数据

    首先新建项目后引用Npgsql，定义连接参数

string strConn = @"SERVER=127.0.0.1;DATABASE=template_postgis;USERID=postgres;PASSWORD=111";
private void btnConnectPostsql_Click(object sender, EventArgs e)
{
  string sql = "INSERT INTO table_name (the_geom) VALUES (ST_GeomFromText('MULTILINESTRING((1 1,2 3,3 4,3 2),(3 2,3 1))',-1));";
   ExecuteScalar(sql)
   }

public object ExecuteScalar( string sql)
{
   IDbConnection dbcon;
   dbcon = new NpgsqlConnection (strConn);
   using (dbcon)
   {
      dbcon.Open();
      IDbCommand dbcmd = dbcon.CreateCommand();
      dbcmd.CommandText = sql;
      object ob = dbcmd.ExecuteScalar();
      dbcon.Close();
      return ob;
     }
  }