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  • DataTable和实体集合互转(C#)

     /// <summary>
            /// DataTable转成List
            /// </summary>
            /// <typeparam name="T"></typeparam>
            /// <param name="dt"></param>
            /// <returns></returns>
            public static List<T> GetTableToList<T>(this DataTable dt)
            {
                var list = new List<T>();
                var plist = new List<PropertyInfo>(typeof(T).GetProperties());
                foreach (DataRow item in dt.Rows)
                {
                    T s = Activator.CreateInstance<T>();
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        PropertyInfo info = plist.Find(p => p.Name == dt.Columns[i].ColumnName);
                        if (info != null)
                        {
                            try
                            {
                                if (!Convert.IsDBNull(item[i]))
                                {
                                    object v = null;
                                    if (info.PropertyType.ToString().Contains("System.Nullable"))
                                    {
                                        v = Convert.ChangeType(item[i], Nullable.GetUnderlyingType(info.PropertyType));
                                    }
                                    else
                                    {
                                        v = Convert.ChangeType(item[i], info.PropertyType);
                                    }
                                    info.SetValue(s, v, null);
                                }
                            }
                            catch (Exception ex)
                            {
                                throw new Exception("字段[" + info.Name + "]转换出错," + ex.Message);
                            }
                        }
                    }
                    list.Add(s);
                }
                return list;
            }
    
    
            /// <summary>
            /// List集合转DataTable
            /// </summary>
            /// <typeparam name="T">实体类型</typeparam>
            /// <param name="list">传入集合</param>
            /// <returns>返回datatable结果</returns>
            public static DataTable GetListToTable<T>(List<T> list)
            {
                Type tp = typeof(T);
                PropertyInfo[] proInfos = tp.GetProperties();
                DataTable dt = new DataTable();
                foreach (var item in proInfos)
                {
                    dt.Columns.Add(item.Name, item.PropertyType); //添加列名及对应类型
                }
                foreach (var item in list)
                {
                    DataRow dr = dt.NewRow();
                    foreach (var proInfo in proInfos)
                    {
                        object obj = proInfo.GetValue(item);
                        if (obj == null)
                        {
                            continue;
                        }
                        dr[proInfo.Name] = obj;
                    }
                    dt.Rows.Add(dr);
                }
                return dt;
            }
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  • 原文地址:https://www.cnblogs.com/yuanshuo/p/15352895.html
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