C#中DataSet转化为实体集合类的方法

/// <summary>
/// DataSet转换为实体类
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="p_DataSet">DataSet</param>
/// <param name="p_TableIndex">待转换数据表索引</param>
/// <returns>实体类</returns>
public static T DataSetToEntity<T>(DataSet p_DataSet, int p_TableIndex)
{
    if (p_DataSet == null || p_DataSet.Tables.Count < 0)
 return default(T);
    if (p_TableIndex > p_DataSet.Tables.Count - 1)
 return default(T);
    if (p_TableIndex < 0)
 p_TableIndex = 0;
    if (p_DataSet.Tables[p_TableIndex].Rows.Count <= 0)
 return default(T);

 

    DataRow p_Data = p_DataSet.Tables[p_TableIndex].Rows[0];
    // 返回值初始化
    T _t = (T)Activator.CreateInstance(typeof(T));
    PropertyInfo[] propertys = _t.GetType().GetProperties();
    foreach (PropertyInfo pi in propertys)
    {
 if (p_DataSet.Tables[p_TableIndex].Columns.IndexOf(pi.Name.ToUpper()) != -1 && p_Data[pi.Name.ToUpper()] != DBNull.Value)
 {
     pi.SetValue(_t, p_Data[pi.Name.ToUpper()], null);
 }
 else
 {
     pi.SetValue(_t, null, null);
 }
    }
    return _t;
}

/// <summary>
/// DataSet转换为实体列表
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="p_DataSet">DataSet</param>
/// <param name="p_TableIndex">待转换数据表索引</param>
/// <returns>实体类列表</returns>
public static IList<T> DataSetToEntityList<T>(DataSet p_DataSet, int p_TableIndex)
{
    if (p_DataSet == null || p_DataSet.Tables.Count < 0)
 return default(IList<T>);
    if (p_TableIndex > p_DataSet.Tables.Count - 1)
 return default(IList<T>);
    if (p_TableIndex < 0)
 p_TableIndex = 0;
    if (p_DataSet.Tables[p_TableIndex].Rows.Count <= 0)
 return default(IList<T>);

    DataTable p_Data = p_DataSet.Tables[p_TableIndex];
    // 返回值初始化
    IList<T> result = new List<T>();
    for (int j = 0; j < p_Data.Rows.Count; j++)
    {
 T _t = (T)Activator.CreateInstance(typeof(T));
 PropertyInfo[] propertys = _t.GetType().GetProperties();
 foreach (PropertyInfo pi in propertys)
 {
     if (p_Data.Columns.IndexOf(pi.Name.ToUpper()) != -1 && p_Data.Rows[j][pi.Name.ToUpper()] != DBNull.Value)
     {
  pi.SetValue(_t, p_Data.Rows[j][pi.Name.ToUpper()], null);
     }
     else
     {
  pi.SetValue(_t, null, null);
     }
 }
 result.Add(_t);
    }
    return result;
}