/// <summary>
/// 将多个实体转换成一个DataTable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <returns></returns>
public static DataTable EntityToDataTable<T>(List<T> list)
{
DataTable dt = new DataTable();
string res = typeof(T).ToString();
int start = res.IndexOf('.') + 1;

//初始化DataTable的值 包括表名、列
dt.TableName = res.Substring(start, res.Length - start);
Dictionary<string, object> dic = Utils.GetAllAttributes<T>(list[0]);
if (dic==null||dic.Count==0)
{
throw new Exception("无法转换数据！");
}
foreach (string key in dic.Keys)
{
// Type type = dic[key].GetType();
dt.Columns.Add(key, dic[key].GetType());
}
foreach (T t in list)
{
dic = new Dictionary<string, object>();
dic = Utils.GetAllAttributes<T>(t);
List<object> lists = new List<object>();
foreach (object item in dic.Values)
{
lists.Add(item);
}
DataRow dr = dt.NewRow();
dr.ItemArray = lists.ToArray();
dt.Rows.Add(dr);
}

return dt;
}

/// <summary>
/// 获取实体的所有属性
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="t"></param>
/// <returns></returns>
public static Dictionary<string, object> GetAllAttributes<T>(T t)
{
Dictionary<string, object> dic = new Dictionary<string, object>();
if (t == null)
{
return dic;
}
PropertyInfo[] infos = t.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
if (infos == null || infos.Length <= 0)
{
return dic;
}
foreach (PropertyInfo info in infos)
{
string Name = info.Name;
object value = info.GetValue(t, null);
if (info.PropertyType.IsValueType || info.PropertyType.Name.StartsWith("String")||info.PropertyType.FullName.Contains("System"))
{
if (dic.ContainsKey(Name))
{
continue;
}
dic.Add(Name, value);
}
//else
//{
// GetAllAttributes(value);
//}
}
return dic;
}