/// <summary>
/// DataTable 转换为 对象List
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dt"></param>
/// <returns></returns>
public static List<T> DataTableToEntities<T>(this DataTable dt) where T : class, new()
{
if (null == dt || dt.Rows.Count == 0) { return null; }
List<T> entities = new List<T>();
foreach (DataRow row in dt.Rows)
{
PropertyInfo[] pArray = typeof(T).GetProperties();
T entity = new T();
Array.ForEach<PropertyInfo>(pArray, p =>
{
object cellvalue = row[p.Name];
if (cellvalue != DBNull.Value)
{
//经过了几个版本的迭代，最后一个为最新的，摘自网上，已附原文地址
//4、原地址：https://blog.csdn.net/Simon1003/article/details/80839744
if (!p.PropertyType.IsGenericType)
{
p.SetValue(entity, Convert.ChangeType(cellvalue, p.PropertyType), null);
}
else
{
Type genericTypeDefinition = p.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
p.SetValue(entity, Convert.ChangeType(cellvalue, Nullable.GetUnderlyingType(p.PropertyType)), null);
}
else
{
throw new Exception("genericTypeDefinition != typeof(Nullable<>)");
}
}
//3、原地址：https://blog.csdn.net/hebbers/article/details/78957569
//Type type = p.PropertyType;
//if (type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))//判断convertsionType是否为nullable泛型类
//{
// //如果type为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
// System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(type);
// //将type转换为nullable对的基础基元类型
// type = nullableConverter.UnderlyingType;
//}
//p.SetValue(entity, Convert.ChangeType(cellvalue, type), null);
//2、自定义 这种很傻，但当前解决速度最快
//if (p.PropertyType.Name.Equals("Int32"))
//{
// p.SetValue(entity, Convert.ToInt32(value), null);
//}
//else if (p.PropertyType.Name.Equals("String"))
//{
// p.SetValue(entity, Convert.ToString(value), null);
//}
//else if (p.PropertyType.Name.Equals("Nullable`1"))
//{
// p.SetValue(entity, Convert.ToInt32(value), null);
//}
////其它类型 暂时不管
//1、字段不为空可以用这种
//p.SetValue(entity, value, null);
}
});
entities.Add(entity);
}
return entities;
}
public static List<T> DataTableToEntities2<T>(this DataTable dt) where T : class, new()
{
if (null == dt || dt.Rows.Count == 0) { return null; }
List<T> entities = new List<T>();
foreach (DataRow row in dt.Rows)
{
PropertyInfo[] pArray = typeof(T).GetProperties();
T entity = new T();
Array.ForEach<PropertyInfo>(pArray, p =>
{
object cellvalue = row[p.Name];
if (cellvalue != DBNull.Value)
{
if (!p.PropertyType.IsGenericType)
{
p.SetValue(entity, Convert.ChangeType(cellvalue, p.PropertyType), null);
}
else
{
Type genericTypeDefinition = p.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
p.SetValue(entity, Convert.ChangeType(cellvalue, Nullable.GetUnderlyingType(p.PropertyType)), null);
}
else
{
throw new Exception("genericTypeDefinition != typeof(Nullable<>)");
}
}
}
});
entities.Add(entity);
}
return entities;
}
public static List<T> DataTableToEntities3<T>(DataTable dt) where T : class, new()
{
if (null == dt || dt.Rows.Count == 0) { return null; }
List<T> entities = new List<T>();
foreach (DataRow row in dt.Rows)
{
PropertyInfo[] pArray = typeof(T).GetProperties();
T entity = new T();
Array.ForEach<PropertyInfo>(pArray, p =>
{
object cellvalue = row[p.Name];
if (cellvalue != DBNull.Value)
{
//经过了几个版本的迭代，最后一个为最新的，摘自网上，已附原文地址
//4、原地址：https://blog.csdn.net/Simon1003/article/details/80839744
if (!p.PropertyType.IsGenericType)
{
p.SetValue(entity, Convert.ChangeType(cellvalue, p.PropertyType), null);
}
else
{
Type genericTypeDefinition = p.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
p.SetValue(entity, Convert.ChangeType(cellvalue, Nullable.GetUnderlyingType(p.PropertyType)), null);
}
else
{
throw new Exception("genericTypeDefinition != typeof(Nullable<>)");
}
}
//3、原地址：https://blog.csdn.net/hebbers/article/details/78957569
//Type type = p.PropertyType;
//if (type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))//判断convertsionType是否为nullable泛型类
//{
// //如果type为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
// System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(type);
// //将type转换为nullable对的基础基元类型
// type = nullableConverter.UnderlyingType;
//}
//p.SetValue(entity, Convert.ChangeType(cellvalue, type), null);
//2、自定义 这种很傻，但当前解决速度最快
//if (p.PropertyType.Name.Equals("Int32"))
//{
// p.SetValue(entity, Convert.ToInt32(value), null);
//}
//else if (p.PropertyType.Name.Equals("String"))
//{
// p.SetValue(entity, Convert.ToString(value), null);
//}
//else if (p.PropertyType.Name.Equals("Nullable`1"))
//{
// p.SetValue(entity, Convert.ToInt32(value), null);
//}
////其它类型 暂时不管
//1、字段不为空可以用这种
//p.SetValue(entity, value, null);
}
});
entities.Add(entity);
}
return entities;
}
/// <summary>
/// 跟属性赋值
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
/// <param name="name"></param>
/// <param name="value"></param>
public static void AssignValueToAttribute<T>(T model, string name, object value)
{
Type t = model.GetType();
var p = t.GetProperty(name);
if (!p.PropertyType.IsGenericType)
{
p.SetValue(model, Convert.ChangeType(value, p.PropertyType), null);
}
else
{
Type genericTypeDefinition = p.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
p.SetValue(model, Convert.ChangeType(value, Nullable.GetUnderlyingType(p.PropertyType)), null);
}
else
{
throw new Exception("genericTypeDefinition != typeof(Nullable<>)");
}
}
}
/// <summary>
/// 获取属性值
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
/// <param name="name"></param>
/// <returns></returns>
public static object GetValueByAttribute<T>(T model, string name)
{
Type t = model.GetType();
var p = t.GetProperty(name);
return p.GetValue(model, null);
}
/// <summary>
/// 跟属性赋值
/// 把一个对象的属性 赋值到 另一个对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="model"></param>
/// <param name="name"></param>
/// <param name="model_old"></param>
public static void AssignValueToAttribute<T>(T model, string name, T model_old)
{
Type t = model_old.GetType();
var p = t.GetProperty(name);
object obj = p.GetValue(model_old, null);
AssignValueToAttribute(model, name, obj);
}
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