128 lines
3.4 KiB
C#
128 lines
3.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Reflection;
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namespace HT.Cloud.Code
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{
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public static class DataTableHelper
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{
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public static DataTable ListToDataTable<T>(List<T> entitys)
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{
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//检查实体集合不能为空
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if (entitys == null || entitys.Count < 1)
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{
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throw new Exception("需转换的集合为空");
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}
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//取出第一个实体的所有Propertie
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Type entityType = entitys[0].GetType();
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PropertyInfo[] entityProperties = entityType.GetProperties();
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//生成DataTable的structure
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//生产代码中，应将生成的DataTable结构Cache起来，此处略
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DataTable dt = new DataTable();
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for (int i = 0; i < entityProperties.Length; i++)
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{
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dt.Columns.Add(entityProperties[i].Name);
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}
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//将所有entity添加到DataTable中
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foreach (object entity in entitys)
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{
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//检查所有的的实体都为同一类型
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if (entity.GetType() != entityType)
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{
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throw new Exception("要转换的集合元素类型不一致");
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}
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object[] entityValues = new object[entityProperties.Length];
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for (int i = 0; i < entityProperties.Length; i++)
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{
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entityValues[i] = entityProperties[i].GetValue(entity, null);
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}
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dt.Rows.Add(entityValues);
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}
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return dt;
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}
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/// <summary>
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/// List过滤
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="entitys"></param>
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/// <param name="list"></param>
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/// <returns></returns>
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public static List<T> ListFilter<T>(List<T> entitys, List<string> list)
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{
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//检查实体集合不能为空
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if (entitys == null || entitys.Count < 1)
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{
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throw new Exception("需转换的集合为空");
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}
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//取出第一个实体的所有Propertie
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Type entityType = entitys[0].GetType();
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PropertyInfo[] entityProperties = entityType.GetProperties();
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//将所有entity过滤
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foreach (object entity in entitys)
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{
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//检查所有的的实体都为同一类型
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if (entity.GetType() != entityType)
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{
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throw new Exception("要转换的集合元素类型不一致");
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}
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for (int i = 0; i < entityProperties.Length; i++)
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{
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if (!list.Contains(entityProperties[i].Name))
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{
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entityProperties[i].SetValue(entity, null);
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}
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}
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}
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return entitys;
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}
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/// <summary>
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/// DataTable转成List
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="dt"></param>
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/// <returns></returns>
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public static List<T> ToDataList<T>(this DataTable dt)
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{
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var list = new List<T>();
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var plist = new List<PropertyInfo>(typeof(T).GetProperties());
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foreach (DataRow item in dt.Rows)
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{
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T s = Activator.CreateInstance<T>();
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for (int i = 0; i < dt.Columns.Count; i++)
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{
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PropertyInfo info = plist.Find(p => p.Name == dt.Columns[i].ColumnName);
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if (info != null)
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{
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try
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{
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if (!Convert.IsDBNull(item[i]))
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{
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object v = null;
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if (info.PropertyType.ToString().Contains("System.Nullable"))
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{
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v = Convert.ChangeType(item[i], Nullable.GetUnderlyingType(info.PropertyType));
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}
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else
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{
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v = Convert.ChangeType(item[i], info.PropertyType);
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}
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info.SetValue(s, v, null);
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}
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}
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catch (Exception ex)
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{
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throw new Exception("字段[" + info.Name + "]转换出错," + ex.Message);
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}
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}
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}
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list.Add(s);
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}
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return list;
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}
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}
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} |