使用反射技术实现的导入Excel文件到数据库的公共方法

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/song_jiang_long/article/details/53521364

还是干脆、利索直接上代码最实惠。。。。

1. 定义接口类IImportService

public interface IImportService
    {
        /// <summary>
        ///  从XLSX导入信息到数据库
        /// </summary>
        /// <param name="filePath">导入文件的全路径</param>
        /// <param name="propertyDic">Excel文档表头和数据库表字段的对应关系（例如Excel文件的"姓名"——》对应数据库的"Name"）</param>
        List<T> ImportEntityListFromXlsx<T>(string filePath, Dictionary<string, string> propertyDic) where T : class,new();
    }

2. 提供默认实现类 IImportService

public class ImportService : IImportService
    {
        private const string cmdText = "Provider=Microsoft.Ace.OleDb.12.0;Data Source={0};Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'";
        public List<T> ImportEntityListFromXlsx<T>(string filePath, Dictionary<string, string> propertyDic) where T : class, new()
        {
            List<T> tempList = new List<T>();
            using (OleDbConnection conn = new OleDbConnection(string.Format(cmdText, filePath)))
            {
                conn.Open();
                DataTable schemaTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                for (int i = 0; i < schemaTable.Rows.Count; i++)
                {
                    string sheetName = schemaTable.Rows[i]["TABLE_NAME"].ToString().Trim();
                    //查询sheet中的数据
                    string strSql = "select * from [" + sheetName + "]";

                    OleDbDataAdapter da = new OleDbDataAdapter(strSql, conn);
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    var dt = ds.Tables[0];

                    foreach (DataRow dr in dt.Rows)
                    {
                        T tempItem = (T)Activator.CreateInstance(typeof(T));
                        foreach (PropertyInfo pop in typeof(T).GetProperties())
                        {
                            if (propertyDic.HasKey(pop.Name))
                            {
                                if (!pop.PropertyType.IsGenericType)
                                {
                                    pop.SetValue(tempItem, Convert.ChangeType(dr[propertyDic[pop.Name]], pop.PropertyType, null));
                                }
                                else
                                {
                                    //泛型Nullable<>
                                    Type genericTypeDefinition = pop.PropertyType.GetGenericTypeDefinition();
                                    if (genericTypeDefinition == typeof(Nullable<>))
                                    {
                                        pop.SetValue(tempItem, string.IsNullOrEmpty(dr[propertyDic[pop.Name]].TryString()) ? null : Convert.ChangeType(dr[propertyDic[pop.Name]], Nullable.GetUnderlyingType(pop.PropertyType)), null);
                                    }
                                }
                            }
                        }
                        tempList.Add(tempItem);
                    }
                }
            }
            return tempList;
        }
    }

3. 使用方法就不用多废话了吧。。。还是贴个图好了~_~