代码说明
/// <summary>
/// 泛型集合与DataSet互相转换
/// </summary>
public class IListDataSet
{
/// <summary>
/// 集合装换DataSet
/// </summary>
/// <param name="list">集合</param>
/// <returns></returns>
/// 2008-08-01 22:08 HPDV2806
public static DataSet ToDataSet( IList p_List )
{
DataSet result = new DataSet();
DataTable _DataTable = new DataTable();
if ( p_List.Count > 0 )
{
PropertyInfo[] propertys = p_List[0].GetType().GetProperties();
foreach ( PropertyInfo pi in propertys )
{
_DataTable.Columns.Add( pi.Name, pi.PropertyType );
}
for ( int i = 0; i < p_List.Count; i++ )
{
ArrayList tempList = new ArrayList();
foreach ( PropertyInfo pi in propertys )
{
object obj = pi.GetValue( p_List[i], null );
tempList.Add( obj );
}
object[] array = tempList.ToArray();
_DataTable.LoadDataRow( array, true );
}
}
result.Tables.Add( _DataTable );
return result;
}
/// <summary>
/// 泛型集合转换DataSet
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list">泛型集合</param>
/// <returns></returns>
/// 2008-08-01 22:43 HPDV2806
public static DataSet ToDataSet<T>( IList<T> list )
{
return ToDataSet<T>( list, null );
}
/// <summary>
/// 泛型集合转换DataSet
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="p_List">泛型集合</param>
/// <param name="p_PropertyName">待转换属性名数组</param>
/// <returns></returns>
/// 2008-08-01 22:44 HPDV2806
public static DataSet ToDataSet<T>( IList<T> p_List, params string[] p_PropertyName )
{
List<string> propertyNameList = new List<string>();
if ( p_PropertyName != null )
propertyNameList.AddRange( p_PropertyName );
DataSet result = new DataSet();
DataTable _DataTable = new DataTable();
if ( p_List.Count > 0 )
{
PropertyInfo[] propertys = p_List[0].GetType().GetProperties();
foreach ( PropertyInfo pi in propertys )
{
if ( propertyNameList.Count == 0 )
{
// 没有指定属性的情况下全部属性都要转换
_DataTable.Columns.Add( pi.Name, pi.PropertyType );
}
else
{
if ( propertyNameList.Contains( pi.Name ) )
_DataTable.Columns.Add( pi.Name, pi.PropertyType );
}
}
for ( int i = 0; i < p_List.Count; i++ )
{
ArrayList tempList = new ArrayList();
foreach ( PropertyInfo pi in propertys )
{
if ( propertyNameList.Count == 0 )
{
object obj = pi.GetValue( p_List[i], null );
tempList.Add( obj );
}
else
{
if ( propertyNameList.Contains( pi.Name ) )
{
object obj = pi.GetValue( p_List[i], null );
tempList.Add( obj );
}
}
}
object[] array = tempList.ToArray();
_DataTable.LoadDataRow( array, true );
}
}
result.Tables.Add( _DataTable );
return result;
}
/// <summary>
/// DataSet装换为泛型集合
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="p_DataSet">DataSet</param>
/// <param name="p_TableIndex">待转换数据表索引</param>
/// <returns></returns>
/// 2008-08-01 22:46 HPDV2806
public static IList<T> DataSetToIList<T>( DataSet p_DataSet, int p_TableIndex )
{
if ( p_DataSet == null || p_DataSet.Tables.Count < 0 )
return null;
if ( p_TableIndex > p_DataSet.Tables.Count - 1 )
return null;
if ( p_TableIndex < 0 )
p_TableIndex = 0;
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 )
{
for ( int i = 0; i < p_Data.Columns.Count; i++ )
{
// 属性与字段名称一致的进行赋值
if ( pi.Name.Equals( p_Data.Columns[i].ColumnName ) )
{
// 数据库NULL值单独处理
if ( p_Data.Rows[j][i] != DBNull.Value )
pi.SetValue( _t, p_Data.Rows[j][i], null );
else
pi.SetValue( _t, null, null );
break;
}
}
}
result.Add( _t );
}
return result;
}
/// <summary>
/// DataSet装换为泛型集合
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="p_DataSet">DataSet</param>
/// <param name="p_TableName">待转换数据表名称</param>
/// <returns></returns>
/// 2008-08-01 22:47 HPDV2806
public static IList<T> DataSetToIList<T>( DataSet p_DataSet, string p_TableName )
{
int _TableIndex = 0;
if ( p_DataSet == null || p_DataSet.Tables.Count < 0 )
return null;
if ( string.IsNullOrEmpty( p_TableName ) )
return null;
for ( int i = 0; i < p_DataSet.Tables.Count; i++ )
{
// 获取Table名称在Tables集合中的索引值
if ( p_DataSet.Tables[i].TableName.Equals( p_TableName ) )
{
_TableIndex = i;
break;
}
}
return DataSetToIList<T>( p_DataSet, _TableIndex );
}
}
使用范围
1. 可以用在业务层中数据获取，获取DataSet的同时也可以转为IList集合为调用者所使用。
2. 在WebServices中传输自定义类型使用，即传递参数都用DataSet类型（WebServices直接支持的数据类型），在使用前将其转换为IList来使用。
来源于:http://www.zxbc.cn/html/20080805/64117.html
在此感谢原作者!
