尝试使用NPOI创建一个新的.xlsx文件并写入它 [英] Trying to create a new .xlsx file using NPOI and write to it

问题描述

编辑：

我正在尝试编写一个小型控制台应用程序，它将从excel电子表格中读取，解析这些行，并将字段数据写入新的excel文件。我正在使用.NET和NPOI库。我终于在Apache挖掘之后，在apache站点上发现了POI的Java文档。这是我的更新的代码与新的错误。

I'm trying to write a small console application that will read in lines from an excel spreadsheet, parse the lines and write the fielded data to a new excel file. I'm using .NET and the NPOI library. I finally after much digging found Java documentation for POI on the apache site. Here is my updated code with new errors.

这实际上创建一个可读文件，除了它只写文本到第三列。

This actually creates a readable file except it only writes text to the third column.

    public static void TransferXLToTable()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("City", typeof(string));
        dt.Columns.Add("State", typeof(string));
        dt.Columns.Add("Zip", typeof(string));

        using (FileStream stream = new FileStream(OpenFile(), FileMode.Open, FileAccess.Read))
        {
            IWorkbook wb = new XSSFWorkbook(stream);
            ISheet sheet = wb.GetSheet("Sheet1");
            string holder;
            int i = 0;
            do
            {
                DataRow dr = dt.NewRow();
                IRow row = sheet.GetRow(i);
                try
                {
                    holder = row.GetCell(0, MissingCellPolicy.CREATE_NULL_AS_BLANK).ToString();
                }
                catch (Exception)
                {
                    break;
                }

                string city = holder.Substring(0, holder.IndexOf(','));
                string state = holder.Substring(holder.IndexOf(',') + 2, 2);
                string zip = holder.Substring(holder.IndexOf(',') + 5, 5);
                dr[0] = city;
                dr[1] = state;
                dr[2] = zip;
                dt.Rows.Add(dr);
                i++;
            } while (!String.IsNullOrEmpty(holder));
        }

        using (FileStream stream = new FileStream(@"C:\Working\FieldedAddresses.xlsx", FileMode.Create, FileAccess.Write))
        {
            IWorkbook wb = new XSSFWorkbook();
            ISheet sheet = wb.CreateSheet("Sheet1");
            ICreationHelper cH = wb.GetCreationHelper();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    IRow row = sheet.CreateRow(i);
                    ICell cell = row.CreateCell(j);
                    cell.SetCellValue(cH.CreateRichTextString(dt.Rows[i].ItemArray[j].ToString()));
                }
            }
            wb.Write(stream);
        }
    }

推荐答案

弄清楚出了什么问题。这实际上是一个非常简单的错误，当我需要在外部循环中创建行时，我正在内部最多的for循环中创建一个新行。希望答案中的工作代码对于需要NPOI起点的任何人都是有用的。

I figured out what was wrong. It was actually a very simple mistake, I was creating a new row in the inner most for loop when I needed to create the row in the outer loop. Hopefully the working code in the answer will be useful for anyone who needs a starting point with NPOI.

这个网站对于从POI或NPOI开始的任何人来说都是一个很好的资源。

This website is a great resource for anyone starting out with POI or NPOI.

http：// poi.apache.org/spreadsheet/quick-guide.html#NewWorkbook

以下是工作代码。

    public static void TransferXLToTable()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("City", typeof(string));
        dt.Columns.Add("State", typeof(string));
        dt.Columns.Add("Zip", typeof(string));

        using (FileStream stream = new FileStream(OpenFile(), FileMode.Open, FileAccess.Read))
        {
            IWorkbook wb = new XSSFWorkbook(stream);
            ISheet sheet = wb.GetSheet("Sheet1");
            string holder;
            int i = 0;
            do
            {
                DataRow dr = dt.NewRow();
                IRow row = sheet.GetRow(i);
                try
                {
                    holder = row.GetCell(0, MissingCellPolicy.CREATE_NULL_AS_BLANK).ToString();
                }
                catch (Exception)
                {
                    break;
                }

                string city = holder.Substring(0, holder.IndexOf(','));
                string state = holder.Substring(holder.IndexOf(',') + 2, 2);
                string zip = holder.Substring(holder.IndexOf(',') + 5, 5);
                dr[0] = city;
                dr[1] = state;
                dr[2] = zip;
                dt.Rows.Add(dr);
                i++;
            } while (!String.IsNullOrEmpty(holder));
        }

        using (FileStream stream = new FileStream(@"C:\Working\FieldedAddresses.xlsx", FileMode.Create, FileAccess.Write))
        {
            IWorkbook wb = new XSSFWorkbook();
            ISheet sheet = wb.CreateSheet("Sheet1");
            ICreationHelper cH = wb.GetCreationHelper();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                IRow row = sheet.CreateRow(i);
                for (int j = 0; j < 3; j++)
                {
                    ICell cell = row.CreateCell(j);
                    cell.SetCellValue(cH.CreateRichTextString(dt.Rows[i].ItemArray[j].ToString()));
                }
            }
            wb.Write(stream);
        }
    }

这篇关于尝试使用NPOI创建一个新的.xlsx文件并写入它的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！