Mapper类
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using System; using System.Collections.Generic; using System.Data; using System.Globalization; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks; namespace CommonHelper { public class Mapper { public static object ToEntity(DataRow adaptedRow, Type entityType) { if (entityType == null || adaptedRow == null) return null; object entity = Activator.CreateInstance(entityType); CopyToEntity(entity, adaptedRow); return entity; } public static T ToEntity<T>(DataRow adaptedRow) where T : new() { T item = new T(); if (adaptedRow == null) return item; item = Activator.CreateInstance<T>(); CopyToEntity(item, adaptedRow); return item; } public static void CopyToEntity(object entity, DataRow adaptedRow) { if (entity == null || adaptedRow == null) return; PropertyInfo[] propertyInfos = entity.GetType().GetProperties(); foreach (PropertyInfo propertyInfo in propertyInfos) { if (!CanSetPropertyValue(propertyInfo, adaptedRow)) continue; try { if (adaptedRow[propertyInfo.Name] is DBNull) { propertyInfo.SetValue(entity, null, null); continue; } SetPropertyValue(entity, adaptedRow, propertyInfo); } finally { } } } public static bool CanSetPropertyValue(PropertyInfo propertyInfo, DataRow adaptedRow) { if (!propertyInfo.CanWrite) return false; if (!adaptedRow.Table.Columns.Contains(propertyInfo.Name)) return false; return true; } public static void SetPropertyValue(object entity, DataRow adaptedRow, PropertyInfo propertyInfo) { if (propertyInfo.PropertyType == typeof(DateTime?) || propertyInfo.PropertyType == typeof(DateTime)) { DateTime date = DateTime.MaxValue; DateTime.TryParse(adaptedRow[propertyInfo.Name].ToString(), CultureInfo.CurrentCulture, DateTimeStyles.None, out date); propertyInfo.SetValue(entity, date, null); } else propertyInfo.SetValue(entity, adaptedRow[propertyInfo.Name], null); } } }
DataTable拓展方法
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using Newtonsoft.Json; using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CommonHelper.Extensions { /// <summary> /// DataTable拓展方法 /// </summary> public static class DateTableExtensions { /// <summary> /// 将dataTable转换为实体类集合 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="table"></param> /// <returns></returns> public static List<T> ToCollection<T>(this DataTable table) where T : new() { if (table != null && table.Rows.Count > 0) { List<T> list = new List<T>(); foreach (DataRow dr in table.Rows) { list.Add(Mapper.ToEntity<T>(dr)); } return list; } else return new List<T>(); } /// <summary> /// 将datattable第一行转换为实体类 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="table"></param> /// <returns></returns> public static T FirstRowEntiy<T>(this DataTable table) where T :new() { if (table != null && table.Rows.Count > 0) return Mapper.ToEntity<T>(table.Rows[0]); else return default(T); } /// <summary> /// datatable转2标准Jon /// </summary> /// <param name="dt">DataTable数据源</param> /// <param name="total">可选:转普通json传>0的值或忽略此参数;如果针对easyUI的json的一定要把total参数分页总行数传进来</param> /// <returns></returns> public static string ToJsonStr(this DataTable dt, int total) { System.Collections.ArrayList arrayList = new System.Collections.ArrayList(); foreach (DataRow dr in dt.Rows) { try { Dictionary<string, object> dictionary = new Dictionary<string, object>();//实例化一个参数集合 foreach (DataColumn column in dt.Columns) { dictionary.Add(column.ColumnName,dr[column.ColumnName].ToString(); } arrayList.Add(dictionary);//arrarylist中添加键值 } catch (Exception) { throw; } } if (total>0)//easyUI专用,分页的总行数 { var dirctionary=new Dictionary<string,object>(); dirctionary.Add("total",total);//此参数是easyUI使用 dirctionary.Add("rows",arrayList);//此参数是easyUI使用 return JsonConvert.SerializeObject(dirctionary);//序列化参数 } else { return JsonConvert.SerializeObject(arrayList); } } } }