DataTable利用内置函数过滤数据，用于查询

DataTable利用内置函数过滤数据，RowFilter用法，写法如下：

           string strName = string.Empty;//查询条件
            string strSQL = string.Empty;//SQL
            DataView datav = dt.DefaultView; //利用Defaultview
            if (!string.IsNullOrEmpty(textBox1.Text.Trim()))
            {
                strName = textBox1.Text.Trim();
            }
            strSQL = " userName like '%" + strName + "%'";
            datav.RowFilter = strSQL;
            this.dgv_DataSource.DataSource = datav;

 利用DataTable的 select内置函数，写法如下：

            string strName = string.Empty;//查询条件
            string strSQL = string.Empty;//SQL
            if (!string.IsNullOrEmpty(textBox1.Text.Trim()))
            {
                strName = textBox1.Text.Trim();
            }

            strSQL = "   1=1 And";
            strSQL += " userName like '%" + strName + "%'";
          

            DataRow[] dr = dt.Select(strSQL);
            if (dr.Length > 0)
            {
              DataTable temp = dr[0].Table.Clone();//把搜索出来的DataRow转换成Datatable
              if (dr != null && dr.Length > 0)
              {
                foreach (DataRow item in dr)
                {
                    temp.Rows.Add(item.ItemArray);
                }
              }
            }
            this.dgv_DataSource.DataSource = temp;