方法一:
/// <summary>
/// DataTable转List<T>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dt"></param>
/// <returns></returns>
public static List<T> DtToList<T>(this DataTable dt) where T : class, new()
{
//属性列表
List<System.Reflection.PropertyInfo> ls_pro = new List<System.Reflection.PropertyInfo>();
Type t = typeof(T);
//把T里所有public属性字段和dt列名一样的放进ls_pro属性列表存放
Array.ForEach<System.Reflection.PropertyInfo>(t.GetProperties(), p => { if (dt.Columns.IndexOf(p.Name) != -1) ls_pro.Add(p); });
//Array.ForEach<System.Reflection.PropertyInfo>(t.GetProperties(), p => { if (dt.Columns.Contains(p.Name)) ls_pro.Add(p); });
List<T> ls_t = new List<T>();
foreach (DataRow dr in dt.Rows)
{
T ob = new T();
//遍历出属性列表里字段在dt里的值(非空即为有值)
ls_pro.ForEach(p => { if (dr[p.Name] != DBNull.Value) p.SetValue(ob, dr[p.Name], null); });
ls_t.Add(ob);
}
return ls_t;
}
方法二:
/// <summary>
/// Datable转List,可转T类型
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dt"></param>
/// <returns></returns>
public static List<T> ToList<T>(this DataTable dt) where T:class,new()
{
Type t = typeof(T);
System.Reflection.PropertyInfo[] pi = t.GetProperties();//读取T里public属性字段
List<T> ls = new List<T>();//存放转换结果
string tname = string.Empty;
foreach (DataRow dr in dt.Rows)
{
T entity = new T();
foreach (var p in pi)
{
tname = p.Name;
if (dt.Columns.Contains(tname))
{
if (!p.CanWrite) continue;
object value = dr[tname];
if (p.PropertyType == typeof(string))
{
p.SetValue(entity,value.ToString(),null);
}
else if (p.PropertyType == typeof(int) || p.PropertyType == typeof(int?))
{
p.SetValue(entity, (int)value, null);
}
else if (p.PropertyType == typeof(decimal) || p.PropertyType == typeof(decimal?))
{
p.SetValue(entity, (decimal)value, null);
}
else if (p.PropertyType == typeof(float) || p.PropertyType == typeof(float?))
{
p.SetValue(entity, (float)value, null);
}
else if (p.PropertyType == typeof(bool))
{
p.SetValue(entity, (bool)value, null);
}
else if (p.PropertyType == typeof(DateTime) || p.PropertyType == typeof(DateTime?))
{
p.SetValue(entity, (DateTime)value, null);
}
else
{
p.SetValue(entity, value, null);
}
}
}
ls.Add(entity);
}
return ls;
}