裕-C#过滤DataTable中的空数据和重复数据

string sql = "select name,age from user";
DataTable data = DB.ExecuteDataTable(string.Format(sql)); //得到DataTable

// ------------start 去重-------------------
string[] distinctcols = new string[(data.Columns.Count)];
foreach (DataColumn dc in data.Columns)
{
     
    distinctcols[dc.Ordinal] = dc.ColumnName;
}
DataView mydataview = new DataView(data);
DataTable data1 = mydataview.ToTable(true, distinctcols);
// ------------end       -------------------

// ------------start 去null-------------------
DataTable data2 = data1.Clone();//克隆表
foreach (DataRow drItem in data1.Rows)
{
     
	//过滤，判断条件的下标自己控制
    if (!string.IsNullOrWhiteSpace(drItem[0].ToString()) && !string.IsNullOrWhiteSpace(drItem[1].ToString()))
    {
     
        data2.Rows.Add(drItem.ItemArray);
    }
}
// ------------end-------------------

/**
下面没啥用，增加一行空白行，搜索的时候当全部搜索用
*/
DataRow row = data2.NewRow();
data2.Rows.InsertAt(row, 0);
return data2;