添加项目文件。

HT.Cloud.Code/Util/DataTableHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Reflection;
+
+namespace HT.Cloud.Code
+{
+	public static class DataTableHelper
+	{
+		public static DataTable ListToDataTable<T>(List<T> entitys)
+		{
+			//检查实体集合不能为空
+			if (entitys == null || entitys.Count < 1)
+			{
+				throw new Exception("需转换的集合为空");
+			}
+			//取出第一个实体的所有Propertie
+			Type entityType = entitys[0].GetType();
+			PropertyInfo[] entityProperties = entityType.GetProperties();
+
+			//生成DataTable的structure
+			//生产代码中，应将生成的DataTable结构Cache起来，此处略
+			DataTable dt = new DataTable();
+			for (int i = 0; i < entityProperties.Length; i++)
+			{
+				dt.Columns.Add(entityProperties[i].Name);
+			}
+			//将所有entity添加到DataTable中
+			foreach (object entity in entitys)
+			{
+				//检查所有的的实体都为同一类型
+				if (entity.GetType() != entityType)
+				{
+					throw new Exception("要转换的集合元素类型不一致");
+				}
+				object[] entityValues = new object[entityProperties.Length];
+				for (int i = 0; i < entityProperties.Length; i++)
+				{
+					entityValues[i] = entityProperties[i].GetValue(entity, null);
+				}
+				dt.Rows.Add(entityValues);
+			}
+			return dt;
+		}
+
+		/// <summary>
+		/// List过滤
+		/// </summary>
+		/// <typeparam name="T"></typeparam>
+		/// <param name="entitys"></param>
+		/// <param name="list"></param>
+		/// <returns></returns>
+		public static List<T> ListFilter<T>(List<T> entitys, List<string> list)
+		{
+			//检查实体集合不能为空
+			if (entitys == null || entitys.Count < 1)
+			{
+				throw new Exception("需转换的集合为空");
+			}
+			//取出第一个实体的所有Propertie
+			Type entityType = entitys[0].GetType();
+			PropertyInfo[] entityProperties = entityType.GetProperties();
+
+			//将所有entity过滤
+			foreach (object entity in entitys)
+			{
+				//检查所有的的实体都为同一类型
+				if (entity.GetType() != entityType)
+				{
+					throw new Exception("要转换的集合元素类型不一致");
+				}
+				for (int i = 0; i < entityProperties.Length; i++)
+				{
+					if (!list.Contains(entityProperties[i].Name))
+					{
+						entityProperties[i].SetValue(entity, null);
+					}
+				}
+			}
+			return entitys;
+		}
+
+		/// <summary>
+		/// DataTable转成List
+		/// </summary>
+		/// <typeparam name="T"></typeparam>
+		/// <param name="dt"></param>
+		/// <returns></returns>
+		public static List<T> ToDataList<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;
+		}
+	}
+}