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//根据过滤条件进行过滤
DataRow[] rows = dt.Select("state = '赢得'");
if( dt.rows.count > 0)
float ratio = rows.count / dt.rows.count;
double i = dataGridView1.Rows.Count;
IEnumerable<DataGridViewRow> enumerableList = this.dataGridView1.Rows.Cast<DataGridViewRow>();
List<DataGridViewRow> list = (from item in enumerableList
where item.Cells[2].Value.ToString() == "赢得"
select item).ToList();
double j = list.Count;
string rate = (j / i * 100).ToString("F2");