Datatableを返すSQLクエリがあります。
var routesTable = _dbhelper.Select("SELECT [RouteId],[UserId],[SourceName],[CreationTime] FROM [Routes] WHERE UserId=@UserId AND RouteId=@RouteId", inputParams);
次に、routesTableのDatatableオブジェクトを操作できます
if (routesTable.Rows.Count == 1)
{
result = new Route(routeId)
{
Name = (string)routesTable.Rows[0]["SourceName"],
Time = routesTable.Rows[0]["CreationTime"] is DBNull ? new DateTime() : Convert.ToDateTime(routesTable.Rows[0]["CreationTime"])
};
result.TrackPoints = GetTrackPointsForRoute(routeId);
}
このコードをlinqに変更したいのですが、LINQでDatatableをシミュレートする方法がわかりません。この部分を作成しました。
Route result = null;
aspnetdbDataContext aspdb = new aspnetdbDataContext();
var Result = from r in aspdb.RouteLinqs
where r.UserId == userId && r.RouteId==routeId
select r;
....
しかし、どうすればこの部分を変更できるのかわかりません。
if (routesTable.Rows.Count == 1)
{
result = new Route(routeId)
{
Name = (string)routesTable.Rows[0]["SourceName"],
Time = routesTable.Rows[0]["CreationTime"] is DBNull ? new DateTime() : Convert.ToDateTime(routesTable.Rows[0]["CreationTime"])
};
どうすればこれができるか教えていただけますか?
ここで編集 すると、元のコードのブロック全体を見ることができます
public Route GetById(int routeId, Guid userId)
{
Route result = null;
var inputParams = new Dictionary<string, object>
{
{"UserId", userId},
{"RouteId", routeId}
};
var routesTable = _dbhelper.Select("SELECT [RouteId],[UserId],[SourceName],[CreationTime] FROM [Routes] WHERE UserId=@UserId AND RouteId=@RouteId", inputParams);
if (routesTable.Rows.Count == 1)
{
result = new Route(routeId)
{
Name = (string)routesTable.Rows[0]["SourceName"],
Time = routesTable.Rows[0]["CreationTime"] is DBNull ? new DateTime() : Convert.ToDateTime(routesTable.Rows[0]["CreationTime"])
};
result.TrackPoints = GetTrackPointsForRoute(routeId);
}
return result;
}
SELECT関数:
public DataTable Select(string query, Dictionary<string, object> parameters)
{
var dt = new DataTable();
using (_command = new SqlCommand(query, _connnection))
{
InitializeParametersAndConnection(parameters);
using (_adapter = new SqlDataAdapter(_command))
{
_adapter.Fill(dt);
}
}
return dt;
}
およびGetTrackPointsForRoute
private List<TrackPoint> GetTrackPointsForRoute(int routeId)
{
aspnetdbDataContext aspdb = new aspnetdbDataContext();
var result = new List<TrackPoint>();
var trackPointsTable = from t in aspdb.TrackPointlinqs
where t.RouteFK == routeId
select t;
foreach (var trackPointRow in trackPointsTable)
{
var trackPoint = new TrackPoint
{
Id = (int)trackPointRow.TrackPointId,
Elevation = Convert.ToSingle(trackPointRow.Elevation),
Latitude = Convert.ToDouble(trackPointRow.Latitude),
Longitude = Convert.ToDouble(trackPointRow.Longitude),
Time = trackPointRow.TrackTime is DBNull ? new DateTime() : (DateTime)trackPointRow.TrackTime
};
result.Add(trackPoint);
}
return result;
}