linq group by 两个值

DataSetHelper dsHelper = DataSetHelper();
List<M_Order> listSrc = new List<M_Order>();
listSrc = (List<M_Order>)ModelConvertHelper<M_Order>.ConvertToModel(ds.Tables[0]);

var sums = listSrc.GroupBy(x => new { x.Name })
.Select(group => new { Keys= group.Key, OrderCount = group.Sum(x => x.OrderCount) });

#region  类

private class M_Order
{
public int OrderCount { get; set; }
public string Name { get; set; }
public string Date { get; set; }

}

#endregion

namespace common
{
public class ModelConvertHelper<T> where T : new()
{
public static IList<T> ConvertToModel(DataTable dt)
{
// 定义集合
IList<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;

}
}

}