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StringBuilder strBAll = new StringBuilder();
foreach (DataRow dr in dtOld.Rows)
{
for (int i = 0; i < dtOld.Columns.Count; i++)
{
strBAll.Append(dr[i].ToString());
strBAll.Append("-");
}
strBAll.Remove(strBAll.Length - 2, 2);
strBAll.Append("+");
}
strBAll.Remove(strBAll.Length-1, 1);
StringBuilder sb = new StringBuilder();
foreach(DataRow dr in dt.Rows)
{
sb.Append(dr["列名a"].ToSting()+"-"+dr["列名"]+"#");
}