/// <summary>
/// Loading <see cref="IEnumerable{T}"/> from specified excel file.
/// /// </summary>
/// <typeparam name="T">The type of the model.</typeparam>
/// <param name="excelFile">The excel file.</param>
/// <param name="startRow">The row to start read.</param>
/// <param name="sheetIndex">Which sheet to read.</param>
/// <param name="valueConverter">The cell value convert.</param>
/// <returns>The <see cref="IEnumerable{T}"/> loading from excel.</returns>
public static IEnumerable <T> Load <T>(string excelFile, int startRow = 1, int sheetIndex = 0, ValueConverter valueConverter = null) where T : class, new()
{
if (!File.Exists(excelFile))
{
throw new FileNotFoundException();
}
var workbook = InitializeWorkbook(excelFile);
// currently, only handle sheet one (or call side using foreach to support multiple sheet)
var sheet = workbook.GetSheetAt(sheetIndex);
// get the writable properties
var properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.SetProperty);
bool fluentConfigEnabled = false;
// get the fluent config
if (Setting.FluentConfigs.TryGetValue(typeof(T), out var fluentConfig))
{
fluentConfigEnabled = true;
}
var cellConfigs = new CellConfig[properties.Length];
for (var j = 0; j < properties.Length; j++)
{
var property = properties[j];
if (fluentConfigEnabled && fluentConfig.PropertyConfigs.TryGetValue(property.Name, out var pc))
{
// fluent configure first(Hight Priority)
cellConfigs[j] = pc.CellConfig;
}
else
{
cellConfigs[j] = null;
}
}
var statistics = new List <StatisticsConfig>();
if (fluentConfigEnabled)
{
statistics.AddRange(fluentConfig.StatisticsConfigs);
}
var list = new List <T>();
int idx = 0;
IRow headerRow = null;
// get the physical rows
var rows = sheet.GetRowEnumerator();
while (rows.MoveNext())
{
var row = rows.Current as IRow;
if (idx == 0)
{
headerRow = row;
}
idx++;
if (row.RowNum < startRow)
{
continue;
}
var item = new T();
var itemIsValid = true;
for (int i = 0; i < properties.Length; i++)
{
var prop = properties[i];
int index = i;
var config = cellConfigs[i];
if (config != null)
{
if (config.IsImportIgnored)
{
continue;
}
index = config.Index;
// Try to autodiscover index from title and cache
if (index < 0 && config.AutoIndex && !string.IsNullOrEmpty(config.Title))
{
foreach (var cell in headerRow.Cells)
{
if (!string.IsNullOrEmpty(cell.StringCellValue))
{
if (cell.StringCellValue.Equals(config.Title, StringComparison.InvariantCultureIgnoreCase))
{
index = cell.ColumnIndex;
// cache
config.Index = index;
break;
}
}
}
}
// check again
if (index < 0)
{
throw new ApplicationException("Please set the 'index' or 'autoIndex' by fluent api or attributes");
}
}
var value = row.GetCellValue(index, _formulaEvaluator);
if (valueConverter != null)
{
value = valueConverter(row.RowNum, index, value);
}
if (value == null)
{
continue;
}
// check whether is statics row
if (idx > startRow + 1 && index == 0
&&
statistics.Any(s => s.Name.Equals(value.ToString(), StringComparison.InvariantCultureIgnoreCase)))
{
var st = statistics.FirstOrDefault(s => s.Name.Equals(value.ToString(), StringComparison.InvariantCultureIgnoreCase));
var formula = row.GetCellValue(st.Columns.First()).ToString();
if (formula.StartsWith(st.Formula, StringComparison.InvariantCultureIgnoreCase))
{
itemIsValid = false;
break;
}
}
// property type
var propType = prop.PropertyType.UnwrapNullableType();
var safeValue = Convert.ChangeType(value, propType, CultureInfo.CurrentCulture);
prop.SetValue(item, safeValue, null);
}
if (itemIsValid)
{
list.Add(item);
}
}
return(list);
}
internal static IWorkbook ToWorkbook <T>(this IEnumerable <T> source, string excelFile, string sheetName)
{
// can static properties or only instance properties?
var properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty);
bool fluentConfigEnabled = false;
// get the fluent config
if (Excel.Setting.FluentConfigs.TryGetValue(typeof(T), out var fluentConfig))
{
fluentConfigEnabled = true;
}
// find out the configs
var cellConfigs = new CellConfig[properties.Length];
for (var j = 0; j < properties.Length; j++)
{
var property = properties[j];
// get the property config
if (fluentConfigEnabled && fluentConfig.PropertyConfigs.TryGetValue(property.Name, out var pc))
{
// fluent configure first(Hight Priority)
cellConfigs[j] = pc.CellConfig;
}
else
{
cellConfigs[j] = null;
}
}
// init work book.
var workbook = InitializeWorkbook(excelFile);
// new sheet
var sheet = workbook.GetSheet(sheetName);
if (sheet == null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
// doesn't override the exist sheet
sheet = workbook.CreateSheet();
}
// cache cell styles
var cellStyles = new Dictionary <int, ICellStyle>();
// title row cell style
var titleStyle = workbook.CreateCellStyle();
titleStyle.Alignment = HorizontalAlignment.Center;
titleStyle.VerticalAlignment = VerticalAlignment.Center;
titleStyle.FillPattern = FillPattern.Bricks;
titleStyle.FillBackgroundColor = HSSFColor.Grey40Percent.Index;
titleStyle.FillForegroundColor = HSSFColor.White.Index;
var titleRow = sheet.CreateRow(0);
var rowIndex = 1;
foreach (var item in source)
{
var row = sheet.CreateRow(rowIndex);
for (var i = 0; i < properties.Length; i++)
{
var property = properties[i];
int index = i;
var config = cellConfigs[i];
if (config != null)
{
if (config.IsExportIgnored)
{
continue;
}
index = config.Index;
}
// this is the first time.
if (rowIndex == 1)
{
// if not title, using property name as title.
var title = property.Name;
if (!string.IsNullOrEmpty(config.Title))
{
title = config.Title;
}
if (!string.IsNullOrEmpty(config.Formatter))
{
try
{
var style = workbook.CreateCellStyle();
var dataFormat = workbook.CreateDataFormat();
style.DataFormat = dataFormat.GetFormat(config.Formatter);
cellStyles[i] = style;
}
catch (Exception ex)
{
// the formatter isn't excel supported formatter
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
}
var titleCell = titleRow.CreateCell(index);
titleCell.CellStyle = titleStyle;
titleCell.SetCellValue(title);
}
var value = property.GetValue(item, null);
if (value == null)
{
continue;
}
var cell = row.CreateCell(index);
if (cellStyles.TryGetValue(i, out var cellStyle))
{
cell.CellStyle = cellStyle;
}
var unwrapType = property.PropertyType.UnwrapNullableType();
if (unwrapType == typeof(bool))
{
cell.SetCellValue((bool)value);
}
else if (unwrapType == typeof(DateTime))
{
cell.SetCellValue(Convert.ToDateTime(value));
}
else if (unwrapType.IsInteger() ||
unwrapType == typeof(decimal) ||
unwrapType == typeof(double) ||
unwrapType == typeof(float))
{
cell.SetCellValue(Convert.ToDouble(value));
}
else if (!string.IsNullOrEmpty(config.Formatter) && value is IFormattable fv)
{
cell.SetCellValue(fv.ToString(config.Formatter, CultureInfo.CurrentCulture));
}
else
{
cell.SetCellValue(value.ToString());
}
}
rowIndex++;
}
// merge cells
var mergableConfigs = cellConfigs.Where(c => c != null && c.AllowMerge).ToList();
if (mergableConfigs.Any())
{
// merge cell style
var vStyle = workbook.CreateCellStyle();
vStyle.VerticalAlignment = VerticalAlignment.Center;
foreach (var config in mergableConfigs)
{
object previous = null;
int rowspan = 0, row = 1;
for (row = 1; row < rowIndex; row++)
{
var value = sheet.GetRow(row).GetCellValue(config.Index, _formulaEvaluator);
if (object.Equals(previous, value) && value != null)
{
rowspan++;
}
else
{
if (rowspan > 1)
{
sheet.GetRow(row - rowspan).Cells[config.Index].CellStyle = vStyle;
sheet.AddMergedRegion(new CellRangeAddress(row - rowspan, row - 1, config.Index, config.Index));
}
rowspan = 1;
previous = value;
}
}
// in what case? -> all rows need to be merged
if (rowspan > 1)
{
sheet.GetRow(row - rowspan).Cells[config.Index].CellStyle = vStyle;
sheet.AddMergedRegion(new CellRangeAddress(row - rowspan, row - 1, config.Index, config.Index));
}
}
}
if (rowIndex > 1 && fluentConfigEnabled)
{
var statistics = fluentConfig.StatisticsConfigs;
var filterConfigs = fluentConfig.FilterConfigs;
var freezeConfigs = fluentConfig.FreezeConfigs;
// statistics row
foreach (var item in statistics)
{
var lastRow = sheet.CreateRow(rowIndex);
var cell = lastRow.CreateCell(0);
cell.SetCellValue(item.Name);
foreach (var column in item.Columns)
{
cell = lastRow.CreateCell(column);
cell.CellFormula = $"{item.Formula}({GetCellPosition(1, column)}:{GetCellPosition(rowIndex - 1, column)})";
}
rowIndex++;
}
// set the freeze
foreach (var freeze in freezeConfigs)
{
sheet.CreateFreezePane(freeze.ColSplit, freeze.RowSplit, freeze.LeftMostColumn, freeze.TopRow);
}
// set the auto filter
foreach (var filter in filterConfigs)
{
sheet.SetAutoFilter(new CellRangeAddress(filter.FirstRow, filter.LastRow ?? rowIndex, filter.FirstCol, filter.LastCol));
}
}
// autosize the all columns
for (int i = 0; i < properties.Length; i++)
{
sheet.AutoSizeColumn(i);
}
return(workbook);
}