c# - 通过 C# 从 Excel 文件导入通用格式的单元格

Question

我目前使用:

• Visual Studio 2015 更新 3
• Microsoft Office Professional Plus 2013
• .Net Framework 4.5.1
• Windows 7 64 位

我正在使用以下代码将 Excel 工作表读入 DataTable:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Windows.Forms;

string filename = "C:\\Users\\myusername\\Documents\\MyFile.xlsx";

DataTable dt = null;

try
{
    string ExcelName = filename.Split(("\\").ToCharArray()[0])[filename.Split(("\\").ToCharArray()[0]).Length - 1].Split('.')[0];

    string ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filename + ";Extended Properties=\"Excel 12.0;HDR=YES;IMEX=1;TypeGuessRows=0;ImportMixedTypes=Text\";";

    string SheetName = CommonFunctions.GetExcelSheetNames(ConnectionString)[0];

    using (OleDbConnection conn = new OleDbConnection(ConnectionString))
    {
        string query = string.Format("SELECT * FROM [" + SheetName + "]");

        conn.Open();

        using (OleDbCommand cmd = new OleDbCommand(query, conn))
        {
            using (OleDbDataReader rdr = cmd.ExecuteReader())
            {
                if (rdr.HasRows)
                {
                    dt = new DataTable();

                    dt.TableName = ExcelName;

                    for (int i = 0; i < rdr.FieldCount; i++)
                    {
                        dt.Columns.Add(new DataColumn(rdr.GetName(i), typeof(string)));

                    }

                    while (rdr.Read())
                    {
                        DataRow dr = dt.NewRow();

                        for (int i = 0; i < rdr.FieldCount; i++)
                        {
                            dr[i] = rdr[i].ToString();

                        }

                        dt.Rows.Add(dr);

                    }

                    foreach (DataRow row in dt.Rows)
                    {
                        string s = row[0].ToString();

                    }

                }

            }

        }

    }

}
catch (Exception ex)
{
    MessageBox.Show(ex.StackTrace, ex.Message, MessageBoxButtons.OK, MessageBoxIcon.Error);

}

示例Excel工作表数据如下，以CSV格式提供，方便在Excel中打开:

"store_number", "stock_code", "desired_quantity"
"64004", "BI_KRA_SEL_350065", "1"
"64004", "BI_KRA_SEL_500080", "1"
"86208", "BI_KRA_SEL_350065", "1"
"86208", "BI_KRA_SEL_500080", "1"
"64019", "BI_KRA_SEL_350065", "1"
"64019", "BI_KRA_SEL_500080", "1"
"85858", "BI_KRA_SEL_350065", "1"
"85858", "BI_KRA_SEL_500080", "1"
"72122", "BI_KRA_SEL_350065", "1"
"72122", "BI_KRA_SEL_500080", "1"
"68427", "BI_KRA_SEL_350065", "1"
"68427", "BI_KRA_SEL_500080", "1"
"79031", "BI_KRA_SEL_350065", "1"
"79031", "BI_KRA_SEL_500080", "1"
"67662", "BI_KRA_SEL_350065", "1"
"67662", "BI_KRA_SEL_500080", "1"
"92246", "BI_KRA_SEL_350065", "1"
"92246", "BI_KRA_SEL_500080", "1"
"85432", "BI_KRA_SEL_350065", "1"
"85432", "BI_KRA_SEL_500080", "1"
"87188", "BI_KRA_SEL_350065", "1"
"87188", "BI_KRA_SEL_500080", "1"
"91021", "BI_KRA_SEL_350065", "1"
"91021", "BI_KRA_SEL_500080", "1"
"79022", "BI_KRA_SEL_350065", "1"
"79022", "BI_KRA_SEL_500080", "1"
"86369", "BI_KRA_SEL_350065", "1"
"86369", "BI_KRA_SEL_500080", "1"
"67670", "BI_KRA_SEL_350065", "1"
"67670", "BI_KRA_SEL_500080", "1"
"92605", "BI_KRA_SEL_350065", "1"
"92605", "BI_KRA_SEL_500080", "1"
"92609", "BI_KRA_SEL_350065", "1"
"92609", "BI_KRA_SEL_500080", "1"
"92610", "BI_KRA_SEL_350065", "1"
"92610", "BI_KRA_SEL_500080", "1"
"92611", "BI_KRA_SEL_350065", "1"
"92611", "BI_KRA_SEL_500080", "1"
"92612", "BI_KRA_SEL_350065", "1"
"92612", "BI_KRA_SEL_500080", "1"
"92613", "BI_KRA_SEL_350065", "1"
"92613", "BI_KRA_SEL_500080", "1"
"92614", "BI_KRA_SEL_350065", "1"
"92614", "BI_KRA_SEL_500080", "1"
"92615", "BI_KRA_SEL_350065", "1"
"92615", "BI_KRA_SEL_500080", "1"
"92616", "BI_KRA_SEL_350065", "1"
"92616", "BI_KRA_SEL_500080", "1"
"w090", "BI_KRA_SEL_350065", "1"
"w090", "BI_KRA_SEL_500080", "1"
"C908", "BI_KRA_SEL_350065", "1"
"C908", "BI_KRA_SEL_500080", "1"
"w0901", "BI_KRA_SEL_350065", "1"
"w0901", "BI_KRA_SEL_500080", "1"
"G202", "BI_KRA_SEL_350065", "1"
"G202", "BI_KRA_SEL_500080", "1"

问题是当第一列包含字母和/或空格时。这些单元格在生成的数据表 (dt) 中显示为空白，即从“w090”到“G202”。

我发现当单元格格式设置为“常规”时会发生这种情况。但是，将这些单元格的格式更改为“文本”似乎可以解决问题。

我现在遇到的唯一问题是我不能指望我的客户提供将单元格设置为“文本”格式的文件。

有没有人知道这个问题的修复方法，或者是否有可能克隆具有“文本”格式的 Excel 文件的方法？

也许有人知道将 Excel 文件导入 DataTables/DataSets 的更聪明的方法。

非常感谢任何帮助。

Answer 1

由于您将 Excel 用作数据库，因此每个字段(列)都必须具有其确切的数据类型。 Excel 数据库驱动程序根据第一个值猜测此类型。在您的情况下，这些第一个值在第一列中是数字。所以数据库在那里猜测数字数据类型。因此，后来出现的字符串不适合该类型。

数据库驱动程序有一个参数IMEX，它导致将所有 数据视为文本。参见 https://www.connectionstrings.com/ace-oledb-12-0/treating-data-as-text/ .

那么试试

string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filename + ";Extended Properties=\"Excel 12.0;IMEX=1\";";

或

string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filename + ";Extended Properties=\"Excel 12.0;HDR=NO;IMEX=1\";";