/// <summary>
/// 返回指定类型的对象，其值等效于指定对象。
/// </summary>
/// <param name="context"> </param>
/// <param name="input"> 需要转换类型的对象 </param>
/// <param name="outputType"> 换转后的类型 </param>
/// <param name="success"> 是否成功 </param>
/// <returns> </returns>
protected override DataTable ChangeTypeImpl(ConvertContext context, object input, Type outputType,
out bool success)
{
success = true;
var view = input as DataView;
if (view != null)
{
return(view.ToTable());
}
var reader = input as IDataReader;
if (reader != null)
{
if (reader.IsClosed)
{
context.AddException("DataReader已经关闭");
success = false;
return(null);
}
var table1 = new DataTable();
table1.Load(reader);
return(table1);
}
var ee = (input as IEnumerable)?.GetEnumerator()
?? input as IEnumerator
?? (input as DataTable)?.Rows.GetEnumerator()
?? (input as DataRow)?.ItemArray.GetEnumerator()
?? (input as DataRowView)?.Row.ItemArray.GetEnumerator()
?? (input as IListSource)?.GetList()?.GetEnumerator();
if (ee == null)
{
context.AddException("仅支持DataView,DataRow,DataRowView,或实现IEnumerator,IEnumerable,IListSource,IDataReader接口的对象对DataTable的转换");
success = false;
return(null);
}
var builder = new DataTableBuilder(context);
builder.TryCreateInstance();
while (ee.MoveNext())
{
if (builder.Set(ee.Current) == false)
{
success = false;
return(null);
}
}
return(builder.Instance);
}