DataTable转换泛型List 帮助类

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;

namespace JNPF.Common.Security
{
/// <summary>
/// 实体转换辅助类
/// </summary>
public class ModelConvertHelper<T> where T : new()
{
/// <summary>
/// List泛型转换DataTable.
/// </summary>
public DataTable ListToDataTable<T>(List<T> items)
{
var tb = new DataTable(typeof(T).Name);

PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

foreach (PropertyInfo prop in props)
{
Type t = GetCoreType(prop.PropertyType);
tb.Columns.Add(prop.Name, t);
}

foreach (T item in items)
{
var values = new object[props.Length];

for (int i = 0; i < props.Length; i++)
{
values[i] = props[i].GetValue(item, null);
}

tb.Rows.Add(values);
}

return tb;
}

/// <summary>
/// model转换DataTable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="items"></param>
/// <returns></returns>
public DataTable ModelToDataTable<T>(T items)
{
var tb = new DataTable(typeof(T).Name);

PropertyInfo[] props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

foreach (PropertyInfo prop in props)
{
Type t = GetCoreType(prop.PropertyType);
tb.Columns.Add(prop.Name, t);
}

var values = new object[props.Length];

for (int i = 0; i < props.Length; i++)
{
values[i] = props[i].GetValue(items, null);
}

tb.Rows.Add(values);

return tb;
}

/// <summary>
/// Determine of specified type is nullable
/// </summary>
public static bool IsNullable(Type t)
{
return !t.IsValueType || (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>));
}

/// <summary>
/// Return underlying type if type is Nullable otherwise return the type
/// </summary>
public static Type GetCoreType(Type t)
{
if (t != null && IsNullable(t))
{
if (!t.IsValueType)
{
return t;
}
else
{
return Nullable.GetUnderlyingType(t);
}
}
else
{
return t;
}
}

/// <summary>
/// DataTable转换泛型List
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static List<T> DataTableToList(DataTable dt)
{
// 定义集合
List<T> ts = new List<T>();

// 获得此模型的类型
Type type = typeof(T);
string tempName = "";
foreach (DataRow dr in dt.Rows)
{
T t = new T();
// 获得此模型的公共属性
PropertyInfo[] propertys = t.GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
tempName = pi.Name; // 检查DataTable是否包含此列

if (dt.Columns.Contains(tempName))
{
// 判断此属性是否有Setter
if (!pi.CanWrite) continue;

object value = dr[tempName];
if (value != DBNull.Value)
pi.SetValue(t, value, null);
}
}
ts.Add(t);
}
return ts;
}

/// <summary>
/// DataTable转Model
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static T DataTableToModel(DataTable dt)
{
// 定义实体
T t = new T();

// 获得此模型的类型
Type type = typeof(T);
string tempName = "";

foreach (DataRow dr in dt.Rows)
{

// 获得此模型的公共属性
PropertyInfo[] propertys = t.GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
tempName = pi.Name; // 检查DataTable是否包含此列

if (dt.Columns.Contains(tempName))
{
// 判断此属性是否有Setter
if (!pi.CanWrite) continue;

object value = dr[tempName];
if (value != DBNull.Value)
pi.SetValue(t, value, null);
}
}
break;
}
return t;
}
}
}