Question

我创建并返回了数据表，这个表有10列。现在我想根据一些动态搜索参数从这个表中过滤。这该怎么做？任何想法都会得到及时的帮助。

// This function will create and return the source table.
var DisplayTable = CreateQueryTable();

在这里，我想进行动态搜索，例如If col1=MyName and Col2=MyCity

ResultGrid.DataSource = DisplayTable;
ResultGrid.DataBind();
Panel1.Controls.Add(ResultGrid);

Answer 1

你可以这样做，

1.创建DataView Like

var dv = dataTable.DefaultView;
dv.RowFilter =  "col1='MyName' and Col2='MyCity'"; // if MyName and MyCity are literal string.

或

dv.RowFilter = "col1='"+MyName+"' and Col2 ='"+ MyCity +"'";// if MyName and MyCity are string variable.

2.使用DataTable Select Method，它将返回DataRow数组

var rows = dataTable.Select("col1='MyName' and Col2='MyCity'"); //if string literal

或

var rows = dataTable.Select("col1='"+MyName+"' and Col2='"+MyCity+"'"); // if string variable

3.By Linq

var filterdData = from row in dataTable.AsEnumerable()
                  where row.Field<string>("col1") == "MyName" 
                  && row.Field<string>("col2") == "MyCity"
                  select row;

Answer 2

您创建数据表的DataView并使用Filter //创建一个DataView DataView dv = new DataView（yourDataTable）; dv.RowFilter =“col1 ='MyName'和Col2 ='MyCity'”; //使用DataView绑定网格

您还可以在桌面上使用select方法

  DataRow[] foundRows;
  foundRows = yourDataTable.Select("col1='MyName' and Col2='MyCity'");

您也可以使用Linq To DataTable

var results = from myRow in yourDataTable.AsEnumerable()
where myRow.Field<string>("col1") == Myname &&
      myRow.Field<string>("Col2") == MyCity
select myRow;

如何查询C＃DataTable？

2 个答案: