从C#中读取Excel文件

Question

是否有免费或开源库直接从C#程序读取Excel文件(.xls)？

它不需要太花哨,只需选择一个工作表并将数据作为字符串读取.到目前为止,我一直在使用Excel的Export to Unicode文本功能,并解析生成的(制表符分隔的)文件,但我想消除手动步骤.

Answer 1

var fileName = string.Format("{0}\\fileNameHere", Directory.GetCurrentDirectory());
var connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; data source={0}; Extended Properties=Excel 8.0;", fileName);

var adapter = new OleDbDataAdapter("SELECT * FROM [workSheetNameHere$]", connectionString);
var ds = new DataSet();

adapter.Fill(ds, "anyNameHere");

DataTable data = ds.Tables["anyNameHere"];

这就是我经常使用的.它有点不同,因为我通常在表的编辑中粘贴AsEnumerable():

var data = ds.Tables["anyNameHere"].AsEnumerable();

因为这允许我使用LINQ从字段中搜索和构建结构.

var query = data.Where(x => x.Field<string>("phoneNumber") != string.Empty).Select(x =>
                new MyContact
                    {
                        firstName= x.Field<string>("First Name"),
                        lastName = x.Field<string>("Last Name"),
                        phoneNumber =x.Field<string>("Phone Number"),
                    });

Answer 2

如果只是Excel文件中包含的简单数据,您可以通过ADO.NET读取数据.请参阅此处列出的连接字符串:

http://www.connectionstrings.com/?carrier=excel2007 或 http://www.connectionstrings.com/?carrier=excel

-Ryan

更新:然后您可以通过类似的方式阅读工作表 select * from [Sheet1$]

Answer 3

ADO.NET方法快速而简单,但它有一些你应该注意的怪癖,特别是关于DataTypes的处理方式.

这篇优秀的文章将帮助您避免一些常见的陷阱:http: //blog.lab49.com/archives/196

Answer 4

这是我用于Excel 2003的内容:

Dictionary<string, string> props = new Dictionary<string, string>();
props["Provider"] = "Microsoft.Jet.OLEDB.4.0";
props["Data Source"] = repFile;
props["Extended Properties"] = "Excel 8.0";

StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, string> prop in props)
{
    sb.Append(prop.Key);
    sb.Append('=');
    sb.Append(prop.Value);
    sb.Append(';');
}
string properties = sb.ToString();

using (OleDbConnection conn = new OleDbConnection(properties))
{
    conn.Open();
    DataSet ds = new DataSet();
    string columns = String.Join(",", columnNames.ToArray());
    using (OleDbDataAdapter da = new OleDbDataAdapter(
        "SELECT " + columns + " FROM [" + worksheet + "$]", conn))
    {
        DataTable dt = new DataTable(tableName);
        da.Fill(dt);
        ds.Tables.Add(dt);
    }
}

Answer 5

Excel Data Reader怎么样？

http://exceldatareader.codeplex.com/

我在生产环境中使用它来将大量数据从各种Excel文件中提取到SQL Server Compact中.它运作良好,而且非常强大.

Answer 6

这是我几年前使用.NET 1.1在C#中编写的一些代码.不确定这是否正是你所需要的(可能不是我最好的代码:)).

using System;
using System.Data;
using System.Data.OleDb;

namespace ExportExcelToAccess
{
    /// <summary>
    /// Summary description for ExcelHelper.
    /// </summary>
    public sealed class ExcelHelper
    {
        private const string CONNECTION_STRING = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=<FILENAME>;Extended Properties=\"Excel 8.0;HDR=Yes;\";";

        public static DataTable GetDataTableFromExcelFile(string fullFileName, ref string sheetName)
        {
            OleDbConnection objConnection = new OleDbConnection();
            objConnection = new OleDbConnection(CONNECTION_STRING.Replace("<FILENAME>", fullFileName));
            DataSet dsImport = new DataSet();

            try
            {
                objConnection.Open();

                DataTable dtSchema = objConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                if( (null == dtSchema) || ( dtSchema.Rows.Count <= 0 ) )
                {
                    //raise exception if needed
                }

                if( (null != sheetName) && (0 != sheetName.Length))
                {
                    if( !CheckIfSheetNameExists(sheetName, dtSchema) )
                    {
                        //raise exception if needed
                    }
                }
                else
                {
                    //Reading the first sheet name from the Excel file.
                    sheetName = dtSchema.Rows[0]["TABLE_NAME"].ToString();
                }

                new OleDbDataAdapter("SELECT * FROM [" + sheetName + "]", objConnection ).Fill(dsImport);
            }
            catch (Exception)
            {
                //raise exception if needed
            }
            finally
            {
                // Clean up.
                if(objConnection != null)
                {
                    objConnection.Close();
                    objConnection.Dispose();
                }
            }


            return dsImport.Tables[0];
            #region Commented code for importing data from CSV file.
            //              string strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source=" + System.IO.Path.GetDirectoryName(fullFileName) +";" +"Extended Properties=\"Text;HDR=YES;FMT=Delimited\"";
            //
            //              System.Data.OleDb.OleDbConnection conText = new System.Data.OleDb.OleDbConnection(strConnectionString);
            //              new System.Data.OleDb.OleDbDataAdapter("SELECT * FROM " + System.IO.Path.GetFileName(fullFileName).Replace(".", "#"), conText).Fill(dsImport);
            //              return dsImport.Tables[0];

            #endregion
        }

        /// <summary>
        /// This method checks if the user entered sheetName exists in the Schema Table
        /// </summary>
        /// <param name="sheetName">Sheet name to be verified</param>
        /// <param name="dtSchema">schema table </param>
        private static bool CheckIfSheetNameExists(string sheetName, DataTable dtSchema)
        {
            foreach(DataRow dataRow in dtSchema.Rows)
            {
                if( sheetName == dataRow["TABLE_NAME"].ToString() )
                {
                    return true;
                }   
            }
            return false;
        }
    }
}

Answer 7

Koogra是一个用C#编写的开源组件,用于读写Excel文件.

Answer 8

虽然你特意要求.xls,暗示较旧的文件格式,对于OpenXML格式(例如xlsx),我强烈推荐OpenXML SDK(http://msdn.microsoft.com/en-us/library/bb448854.aspx)

Answer 9

我在C#中做了大量的Excel文件阅读,我们使用了两种方法:

• COM API,您可以直接访问Excel的对象并通过方法和属性对其进行操作
• 允许像数据库一样使用Excel的ODBC驱动程序.

后一种方法要快得多:读取20列和200行的大表通过COM需要30秒,通过ODBC需要半秒.所以如果您需要的只是数据,我会推荐数据库方法.

干杯,

卡尔

Answer 10

ExcelMapper是一个开源工具(http://code.google.com/p/excelmapper/),可用于将Excel工作表读取为强类型对象.它支持xls和xlsx格式.

Answer 11

我想展示一个用.NET读取xls/xlsx文件的简单方法.我希望以下内容对您有所帮助.

 private DataTable ReadExcelToTable(string path)    
 {

     //Connection String

     string connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";  
     //the same name 
     //string connstring = Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + path + //";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';"; 

     using(OleDbConnection conn = new OleDbConnection(connstring))
     {
        conn.Open();
        //Get All Sheets Name
        DataTable sheetsName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,new object[]{null,null,null,"Table"});  

        //Get the First Sheet Name
        string firstSheetName = sheetsName.Rows[0][2].ToString(); 

        //Query String 
        string sql = string.Format("SELECT * FROM [{0}]",firstSheetName); 
        OleDbDataAdapter ada =new OleDbDataAdapter(sql,connstring);
        DataSet set = new DataSet();
        ada.Fill(set);
        return set.Tables[0];   
   }
 }

代码来自文章:http://www.c-sharpcorner.com/uploadfile/d2dcfc/read-excel-file-with-net/.您可以从中获取更多详细信息.