/// <summary> /// Generates a GridDataReponse using the GridDataRequest and an IQueryable source, /// like a DataSet in Entity Framework. /// </summary> /// <param name="request">The Tubular's grid request</param> /// <param name="dataSource">The IQueryable source</param> /// <returns></returns> public static GridDataResponse CreateGridDataResponse(this GridDataRequest request, IQueryable dataSource) { var response = new GridDataResponse { Counter = request.Counter, TotalRecordCount = dataSource.Count(), FilteredRecordCount = dataSource.Count() }; var properties = ExtractProperties(dataSource.ElementType); var columnMap = MapColumnsToProperties(request.Columns, properties); var subset = FilterResponse(request, dataSource, response); // Perform Sorting var orderingExpression = string.Empty; foreach (var column in request.Columns.Where(x => x.SortOrder > 0).OrderBy(x => x.SortOrder)) { orderingExpression += column.Name + " " + (column.SortDirection == SortDirection.Ascending ? "ASC" : "DESC") + ", "; } // Apply the sorting expression if supplied if (!string.IsNullOrWhiteSpace(orderingExpression)) { subset = subset.OrderBy(orderingExpression.Substring(0, orderingExpression.Length - 2)); } else { subset = subset.OrderBy(request.Columns.First().Name + " ASC"); } subset = subset.Skip(request.Skip); var pageSize = request.Take; // Take with value -1 represents entire set if (request.Take == -1) { response.TotalPages = 1; response.CurrentPage = 1; pageSize = subset.Count(); } else { subset = subset.Take(request.Take); response.TotalPages = (response.FilteredRecordCount + pageSize - 1)/pageSize; if (response.TotalPages > 0) { response.CurrentPage = 1 + (int) ((request.Skip/(float) response.FilteredRecordCount)*response.TotalPages); } } response.Payload = CreateGridPayload(subset, columnMap, pageSize, request.TimezoneOffset); return response; }
private static IQueryable FilterResponse(GridDataRequest request, IQueryable subset, GridDataResponse response) { // Perform Searching var searchLambda = new StringBuilder(); var searchParamArgs = new List<object>(); switch (request.Search.Operator) { case CompareOperators.Auto: foreach (var column in request.Columns.Where(x => x.Searchable)) { searchLambda.AppendFormat("{0}.Contains(@{1}) ||", column.Name, searchParamArgs.Count); searchParamArgs.Add(request.Search.Text); } break; } // Perform Filtering foreach (var column in request.Columns.Where(x => x.Filter != null)) { if (String.IsNullOrWhiteSpace(column.Filter.Text) && column.Filter.Argument == null) continue; // TODO: Handle null? switch (column.Filter.Operator) { case CompareOperators.Equals: case CompareOperators.NotEquals: if (String.IsNullOrWhiteSpace(column.Filter.Text)) continue; // TODO: This code is for use with Dynamic LINQ, but It needs EF //if (column.DataType == DataType.Date.ToString().ToLower()) // searchLambda.AppendFormat("EntityFunctions.TruncateTime({0}) == @{1} &&", column.Name, searchParamArgs.Count); //else searchLambda.AppendFormat("{0} {2} @{1} &&", column.Name, searchParamArgs.Count, GetSqlOperator(column.Filter.Operator)); if (String.Equals(column.DataType, DataType.Numeric.ToString(), StringComparison.CurrentCultureIgnoreCase)) { searchParamArgs.Add(Decimal.Parse(column.Filter.Text)); } else if ( String.Equals(column.DataType, DataType.DateTime.ToString(), StringComparison.CurrentCultureIgnoreCase) || String.Equals(column.DataType, DataType.Date.ToString(), StringComparison.CurrentCultureIgnoreCase)) { searchParamArgs.Add(DateTime.Parse(column.Filter.Text)); } else if (String.Equals(column.DataType, DataType.Boolean.ToString(), StringComparison.CurrentCultureIgnoreCase)) { searchParamArgs.Add(Boolean.Parse(column.Filter.Text)); } else { searchParamArgs.Add(column.Filter.Text); } break; case CompareOperators.Contains: searchLambda.AppendFormat("{0}.Contains(@{1}) &&", column.Name, searchParamArgs.Count); searchParamArgs.Add(column.Filter.Text); break; case CompareOperators.StartsWith: searchLambda.AppendFormat("{0}.StartsWith(@{1}) &&", column.Name, searchParamArgs.Count); searchParamArgs.Add(column.Filter.Text); break; case CompareOperators.EndsWith: searchLambda.AppendFormat("{0}.EndsWith(@{1}) &&", column.Name, searchParamArgs.Count); searchParamArgs.Add(column.Filter.Text); break; case CompareOperators.Gte: case CompareOperators.Gt: case CompareOperators.Lte: case CompareOperators.Lt: searchLambda.AppendFormat("{0} {2} @{1} &&", column.Name, searchParamArgs.Count, GetSqlOperator(column.Filter.Operator)); if (String.Equals(column.DataType, DataType.Numeric.ToString(), StringComparison.CurrentCultureIgnoreCase)) searchParamArgs.Add(decimal.Parse(column.Filter.Text)); else searchParamArgs.Add(DateTime.Parse(column.Filter.Text)); break; case CompareOperators.Multiple: if (column.Filter.Argument == null || column.Filter.Argument.Length == 0) continue; var filterString = "("; foreach (var filter in column.Filter.Argument) { filterString += String.Format("{0} == @{1} ||", column.Name, searchParamArgs.Count); searchParamArgs.Add(filter); } if (filterString.Length == 1) continue; searchLambda.AppendFormat(filterString.Remove(filterString.Length - 3, 3) + ") &&"); break; case CompareOperators.Between: if (column.Filter.Argument == null || column.Filter.Argument.Length == 0) continue; searchLambda.AppendFormat("(({0} >= @{1}) && ({0} <= @{2})) &&", column.Name, searchParamArgs.Count, searchParamArgs.Count + 1); if (String.Equals(column.DataType, DataType.Numeric.ToString(), StringComparison.CurrentCultureIgnoreCase)) { searchParamArgs.Add(decimal.Parse(column.Filter.Text)); searchParamArgs.Add(decimal.Parse(column.Filter.Argument[0])); } else { searchParamArgs.Add(DateTime.Parse(column.Filter.Text)); searchParamArgs.Add(DateTime.Parse(column.Filter.Argument[0])); } break; } } if (searchLambda.Length > 0) { subset = subset.Where(searchLambda.Remove(searchLambda.Length - 3, 3).ToString(), searchParamArgs.ToArray()); response.FilteredRecordCount = subset.Count(); } return subset; }