c# WPF 项目优化

public static void SetDataSource(ListView lv, DataSet ds)
{
DataSet preds = (DataSet)lv.DataContext;
if (preds == null) // first set datacontext
{
preds = ds;
lv.DataContext = preds;
}
else // reset data context, we don't change the datacontext object , but change data rows
{
DataTable tb = preds.Tables[0];
tb.Clear();
tb.Dispose();
foreach (DataRow dr in ds.Tables[0].Rows)
{
tb.ImportRow(dr);
}
lv.DataContext = preds;
ds.Dispose();
ds = null;
}
}

public static void AddDataRowToDataSource(ListView lv, DataRow dr)
{
DataSet ds = (DataSet)lv.DataContext;
if (ds == null)
{
return;
}
else
{
DataTable tb = ds.Tables[0];
tb.ImportRow(dr);
lv.DataContext = ds;
}
}