C#：导入Excel通用类（CSV格式）

• 一、引用插件LumenWorks.Framework.IO.dll（CsvReader）

　　　　　插件下载地址：https://pan.baidu.com/s/1X9Sl4bWTNHJOJb_v-KUndA  提取密码 0az3

• 二、定义通用接口IExcelData.cs和IDataTransform.cs

　　IDataTransform.cs

 public interface IDataTransform { List<Dictionary<string, string>> DataTableToDictionary(DataTable dt); } 

　　IExcelData.cs　　　　     

public interface IExcelData : IDataTransform
    {
        /// <summary>
        /// Excel工作薄所有表格转化成DataTable对应字典
        /// </summary>
        Dictionary<string, DataTable> DataTableDictionary { get; }

        /// <summary>
        /// Excel工作薄所有表格的名称集合
        /// </summary>
        List<string> SheetNames { get; }

        /// <summary>
        /// Excel工作薄所有表格数据集合
        /// </summary>
        List<DataTable> DataTableList { get; }

        /// <summary>
        /// 表格数量
        /// </summary>
        int SheetCount { get; }

        /// <summary>
        /// Excel文件路径
        /// </summary>
        string FilePath { get; }

        /// <summary>
        /// Excel流
        /// </summary>
        Stream ExcelStream { get; }

        /// <summary>
        /// Excel文件类型
        /// </summary>
        ExcelType ExcelType { get; }

        /// <summary>
        /// 获取Excel第一列数据集合
        /// </summary>
        List<Dictionary<string, string>> GetFirstRecords();

        /// <summary>
        /// 执行方法
        /// </summary>
        void Load();
    }

• 三、定义通用类CsvData.cs

　　　　　CsvData.cs

public class CsvData : IExcelData
    {
        #region 属性值
        public Dictionary<string, DataTable> DataTableDictionary
        {
            get { throw new NotImplementedException(); }
        }
        public List<string> SheetNames
        {
            get { throw new NotImplementedException(); }
        }
        public List<DataTable> DataTableList
        {
            get { throw new NotImplementedException(); }
        }
        public int SheetCount
        {
            get { throw new NotImplementedException(); }
        }
        private string m_filePath;
        public string FilePath
        {
            get { return m_filePath; }
        }
        private Stream m_stream;
        public Stream ExcelStream
        {
            get { return m_stream; }
        }
        public ExcelType ExcelType
        {
            get { throw new NotImplementedException(); }
        }
        private List<Dictionary<string, string>> m_Records;
        public List<Dictionary<string, string>> Records { get { return m_Records; } }
        #endregion
        #region 构造
        public CsvData(string path)
        {
            m_filePath = path;
        }
        public CsvData(Stream stream)
        {
            m_stream = stream;
        }
        #endregion
        #region 方法
        public List<Dictionary<string, string>> DataTableToDictionary(DataTable dt)
        {
            throw new NotImplementedException();
        }

        public List<Dictionary<string, string>> GetFirstRecords()
        {
            return m_Records;
        }

        /// <summary>
        /// 执行方法
        /// </summary>
        public void Load()
        {
            if (!string.IsNullOrEmpty(m_filePath))
                Load(m_filePath);
            else
                Load(m_stream);
        }

        /// <summary>
        /// 执行方法
        /// </summary>
        /// <param name="m_filePath">文件路径</param>
        private void Load(string m_filePath)
        {
            using (FileStream fs=File.Open(m_filePath,FileMode.Open,FileAccess.Read))
            {
                using (StreamReader sr=new StreamReader(fs))
                {
                    using (CsvReader csvReader=new CsvReader(sr,false))
                    {
                        m_Records = new List<Dictionary<string, string>>();
                        int count = csvReader.FieldCount;
                        string[] keys = new string[count];
                        string[] array = new string[count];
                        IEnumerator rows = csvReader.GetEnumerator();
                        try
                        {
                            while (rows.MoveNext())
                            {
                                if (csvReader.CurrentRecordIndex==0)
                                {
                                    keys = (string[])rows.Current;
                                    for (int i = 0; i < keys.Length; i++)
                                    {
                                        string s = keys[i].Replace('"', ' ').Trim();
                                        keys[i] = s;
                                    }
                                }
                                else
                                {
                                    array = (string[])rows.Current;
                                    Dictionary<string, string> dic = new Dictionary<string, string>();
                                    for (int i = 0; i < keys.Length; i++)
                                    {
                                        dic.Add(keys[i], array[i]);
                                    }
                                    m_Records.Add(dic);
                                }
                            }
                        }
                        catch
                        {
                            throw;
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 执行方法
        /// </summary>
        /// <param name="m_stream">文件流</param>
        private void Load(Stream m_stream)
        {
            using (StreamReader sr=new StreamReader(m_stream))
            {
                while (true)
                {
                    var line = sr.ReadLine();
                    if (line=="")
                    {
                        break;
                    }
                }
                for (int i = 0; i < 2; i++)
                {
                    sr.Read();
                }
                using (CsvReader csvReader=new CsvReader(sr,false))
                {
                    m_Records = new List<Dictionary<string, string>>();
                    int count = csvReader.FieldCount;
                    string[] keys = new string[count];
                    string[] array = new string[count];
                    IEnumerator rows = csvReader.GetEnumerator();
                    try
                    {
                        while (rows.MoveNext())
                        {
                            if (csvReader.CurrentRecordIndex==0)
                            {
                                keys = (string[])rows.Current;
                                for (int i = 0; i < keys.Length; i++)
                                {
                                    string s = keys[i].Replace('"', ' ').Trim();
                                    keys[i] = s;
                                }
                            }
                            else
                            {
                                array = (string[])rows.Current;
                                Dictionary<string, string> dic = new Dictionary<string, string>();
                                for (int i = 0; i < keys.Length; i++)
                                {
                                    dic.Add(keys[i], array[i]);
                                }
                                m_Records.Add(dic);
                            }
                        }
                    }
                    catch
                    {
                        
                        throw;
                    }
                }
            }
        }
        #endregion
    }

注：以上的通用类将CSV格式的Excel转换成DataTable，识别Excel中的首列为数据库表的列项，会提取这一列如果判断匹配，这个就是业务代码了，以上未提供，根据需求自己编写就好。

原著：清风一人醉 http://www.cnblogs.com/W--Jing/

以上方法可以个人分享研究！

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