Question:
anybody knows how or some library to use for this ?
Solution:1
Take a look here for the library part:
Solution:2
The code below is code I use to convert an IEnumerable<T> to a DataTable containing columns named for each property, along with the values of each item in the IEnumerable as rows. It's a very small hop from this to saving it as a CSV file
public class IEnumerableToDataTable { public static DataTable CreateDataTableForPropertiesOfType<T>() { DataTable dt = new DataTable(); PropertyInfo[] piT = typeof(T).GetProperties(); foreach (PropertyInfo pi in piT) { Type propertyType = null; if (pi.PropertyType.IsGenericType) { propertyType = pi.PropertyType.GetGenericArguments()[0]; } else { propertyType = pi.PropertyType; } DataColumn dc = new DataColumn(pi.Name, propertyType); if (pi.CanRead) { dt.Columns.Add(dc); } } return dt; } public static DataTable ToDataTable<T>(IEnumerable<T> items) { var table = CreateDataTableForPropertiesOfType<T>(); PropertyInfo[] piT = typeof(T).GetProperties(); foreach (var item in items) { var dr = table.NewRow(); for (int property = 0; property < table.Columns.Count; property++) { if (piT[property].CanRead) { dr[property] = piT[property].GetValue(item, null); } } table.Rows.Add(dr); } return table; } } So, you could write the following to convert your data to a datatable:
IEnumerable<Thing> values = GetMyIEnumerableValues(); var tableOfData = IEnumerableToDataTable.ToDataTable(values); Once it's there, it's fairly trivial to write it out to a CSV file, or any other format of your choice, as all the "tricky" reflection work to extract the data from the IEnumerable<T> has been done.
Solution:3
I have solved a problem similar like you asked. Like you have a IEnumerable
IEnumerable<TaskSheetHead> taskSheetHead = new TaskSheetHeadService().GetEmployeeTimesheet(entity); So if you want to make a excel from this just create a workbook
var workbook = new HSSFWorkbook(); var sheet = workbook.CreateSheet(); And iterate with a looping and then add it to the worksheet
foreach (TaskSheetHead taskSheethead in taskSheetHead) { //decimal totalTask = decimal.Zero; //double totalTime = 0; foreach (TaskSheet taskSheet in taskSheethead.TaskSheets) { var row2 = sheet.CreateRow(rowNumber++); row2.CreateCell(0).SetCellValue(taskSheethead.Date.ToString("MMMM dd, yyyy")); row2.CreateCell(1).SetCellValue(taskSheet.Task.Project.ProjectName + ":" + taskSheet.Task.Title + "-" + taskSheet.Comment); row2.CreateCell(2).SetCellValue(taskSheet.ExpendedHour); row2.CreateCell(3).SetCellValue(taskSheet.IsBilledToClient); //totalTask += 1; //totalTime += taskSheet.ExpendedHour; } var row3 = sheet.CreateRow(rowNumber++); row3.CreateCell(0).SetCellValue(""); row3.CreateCell(1).SetCellValue(""); row3.CreateCell(2).SetCellValue(""); row3.CreateCell(3).SetCellValue(""); } Here I have another child list, therefore I have iterated using a inner loop. Do as your choice.
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