Open XML 里写入List数据

思路：

• List数据转换成DataTable
• 然后将DataTable的行列写进Excel里

第一步 将List数据转换成DataTable

这里注意枚举值，如果不对枚举值进行转换，那么最后生成的数据是int类型的数据。

private static System.Data.DataTable ToDataTable(IList data)
        {
            PropertyDescriptorCollection props =
                TypeDescriptor.GetProperties(typeof(T));
            System.Data.DataTable table = new System.Data.DataTable();
            for (int i = 0; i < props.Count; i++)
            {
                PropertyDescriptor prop = props[i];
                if (prop.PropertyType.IsEnum)
                {
                    table.Columns.Add(prop.Name, typeof(string));
                }
                else
                {
                    table.Columns.Add(prop.Name, prop.PropertyType);
                }

            }
            object[] values = new object[props.Count];
            foreach (T item in data)
            {
                for (int i = 0; i < values.Length; i++)
                {
                    if (props[i].GetValue(item) is Enum)
                    {
                        values[i] = props[i].GetValue(item).ToString();
                    }
                    else
                    {
                        values[i] = props[i].GetValue(item);
                    }
                }
                table.Rows.Add(values);
            }
            return table;
        }

第二步 然后将DataTable的行列写进Excel里

注意事项

• 日期的转换，可以把日期转换成字符串
• 布尔值的转换，在Excel里，布尔值实际上是0或者1

        private static void CreateExcel(string filePath, string sheetName,List models)
        {
            using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filePath, SpreadsheetDocumentType.Workbook))
            {
                //添加workbook文件,并创建workbook节点
                WorkbookPart workbookPart = spreadsheetDocument.AddWorkbookPart();
                workbookPart.Workbook = new Workbook();

                //在workbook里添加sheetdata节点
                WorksheetPart worksheetPart = workbookPart.AddNewPart();
                worksheetPart.Worksheet = new Worksheet(new SheetData());

                //添加sheets文件夹
                Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild(new Sheets());

                //添加sheet文件
                Sheet sheet = new Sheet() { Id = spreadsheetDocument.WorkbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = sheetName };
                sheets.Append(sheet);

                //给SheetData添加数据
                SheetData sheetData = worksheetPart.Worksheet.GetFirstChild();

                System.Data.DataTable table = ToDataTable(models);

                Row headerRow = new Row();

                List columns = new List();

                //标题名全是string
                foreach (DataColumn column in table.Columns)
                {
                    columns.Add(column.ColumnName);
                    Cell cell = new Cell();
                    cell.DataType = new EnumValue(CellValues.String);
                    cell.CellValue = new CellValue(column.ColumnName);
                    headerRow.Append(cell);
                }
                sheetData.Append(headerRow);

                foreach (DataRow dsrow in table.Rows)
                {
                    Row newRow = new Row();
                    foreach (String col in columns)
                    {
                        Cell cell = new Cell();
                        if (dsrow[col].GetType().Name == "Int32"|| dsrow[col].GetType().Name == "Double")
                        {
                            cell.DataType = new EnumValue(CellValues.Number);
                            cell.CellValue = new CellValue(dsrow[col].ToString());
                        }
                        else if (dsrow[col].GetType().Name == "DateTime")
                        {
                            cell.DataType = new EnumValue(CellValues.String);
                            DateTime dtValue = (DateTime)dsrow[col];
                            cell.CellValue = new CellValue(dtValue.ToShortDateString().ToString());
                        }
                        else if (dsrow[col].GetType().Name == "Boolean")
                        {
                            cell.DataType = new EnumValue(CellValues.Boolean);
                            cell.CellValue = new CellValue((bool)dsrow[col]==true?"1":"0");
                        }
                        else
                        {
                            cell.DataType = new EnumValue(CellValues.String);
                            cell.CellValue = new CellValue(dsrow[col].ToString());
                        }
                        newRow.Append(cell);
                    }
                    sheetData.Append(newRow);
                }

                workbookPart.Workbook.Save();
            }
        }