102 lines
3.0 KiB
C#
102 lines
3.0 KiB
C#
using NPOI.HSSF.UserModel;
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using NPOI.SS.UserModel;
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using NPOI.XSSF.UserModel;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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namespace TempTask.WebEntry.Tools
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{
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/// <summary>
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///
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/// </summary>
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public static class ExcelHelper
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{
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static ExcelHelper()
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{
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System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
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}
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/// <summary>
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/// 判断是否为兼容模式
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/// </summary>
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/// <param name="filePath"></param>
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/// <returns></returns>
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public static bool GetIsCompatible(string filePath)
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{
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return filePath.EndsWith(".xls", StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// 创建工作薄
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/// </summary>
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/// <param name="isCompatible"></param>
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/// <returns></returns>
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public static IWorkbook CreateWorkbook(bool isCompatible)
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{
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if (isCompatible)
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{
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return new HSSFWorkbook();
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}
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else
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{
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return new XSSFWorkbook();
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}
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}
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/// <summary>
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/// 创建工作薄(依据文件流)
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/// </summary>
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/// <param name="isCompatible"></param>
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/// <param name="stream"></param>
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/// <returns></returns>
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public static IWorkbook CreateWorkbook(bool isCompatible, dynamic stream)
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{
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if (isCompatible)
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{
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return new HSSFWorkbook(stream);
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}
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else
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{
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return new XSSFWorkbook(stream);
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}
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}
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/// <summary>
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/// 列名字母转索引
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/// </summary>
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/// <param name="columnName"></param>
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/// <returns></returns>
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public static int ToExcelColumnIndex(this string columnName)
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{
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if (!Regex.IsMatch(columnName.ToUpper(), @"[A-Z]+")) { throw new Exception("invalid parameter"); }
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int index = 0;
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char[] chars = columnName.ToUpper().ToCharArray();
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for (int i = 0; i < chars.Length; i++)
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{
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index += ((int)chars[i] - (int)'A' + 1) * (int)Math.Pow(26, chars.Length - i - 1);
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}
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return index - 1;
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}
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/// <summary>
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/// 列索引转字母
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/// </summary>
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/// <param name="index"></param>
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/// <returns></returns>
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public static string ToExcelColumnName(this int index)
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{
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if (index < 0) { throw new Exception("invalid parameter"); }
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List<string> chars = new List<string>();
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do
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{
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if (chars.Count > 0) index--;
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chars.Insert(0, ((char)(index % 26 + (int)'A')).ToString());
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index = (int)((index - index % 26) / 26);
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} while (index > 0);
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return String.Join(string.Empty, chars.ToArray());
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}
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}
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}
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