[英]search values from datatable (similer to like clause ) without using database
public partial class WebForm4 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!(IsPostBack))
{
Session["List"] = null ;
}
}
public static DataTable dt;
public static int i = 1;
// static int i = 1;
//static List<string> lst;
protected void btnAdd_Click(object sender, EventArgs e)
{
Session["List"] = dt;
dt = new DataTable();
DataRow dr = null;
// dt.Columns.Add(new DataColumn("RowNumber", typeof(int)));
dt.Columns.Add(new DataColumn("Column1", typeof(string)));
// dt.Columns.Add(new DataColumn("Column2", typeof(string)));
if (Session["List"] == null)
{
dr = dt.NewRow();
dr["Column1"] = txtAdd.Text;
dt.Rows.Add(dr);
// lst.Add(txtAdd.Text);
}
else if (Session["List"] != null)
{
dt = (DataTable)Session["List"];
dr = dt.NewRow();
dr["Column1"] = txtAdd.Text;
dt.Rows.Add(dr);
//lst = (List<string>)Session["List"];
//lst.Insert(i,txtAdd.Text);
//i++;
}
}
protected void btnNew_Click(object sender, EventArgs e)
{
List<string> lst = new List<string>();
foreach (DataRow row in dt.Rows)
{
foreach (DataColumn col in dt.Columns)
{
lst.Add(row[col].ToString());
}
}
for (int j = 0; j >= dt.Rows.Count; j++)
{
}
bool isfound = lst.Contains(txtSearch.Text);
Response.Write(Convert.ToString(isfound));
dlshow.DataSource = dt; // i want to bind only matching values to datalist
dlshow.DataBind();
}
}
i have two textboxes one to add and other is to search i want to bind only those matching values matches with search textbox ( Like ' Like ' clause ) i am not using any data base 我有两个文本框,一个要添加,另一个是搜索,我只想绑定与搜索文本框匹配的那些匹配值(例如“ Like”子句),我不使用任何数据库
//just this will do
protected void btnAdd_Click(object sender, EventArgs e)
{
List <string > lst = (List<string >)Session["List"];
lst.Add(txtAdd.Text);
// Change the list in session with new list
Session["List"] = lst;
}
Here the logic is wrong like you r testing if the session["list"] is null then u want to do the operation but if session is null then lst would also be null 这里的逻辑是错误的,就像您要测试session [“ list”]是否为null则要执行该操作一样,但是如果session为null则lst也将为null
List <string > lst = (List<string >)Session["List"];
lst.Add(txtAdd.Text);
DataTable dt2 = dt.Select("Column1 Like '%" + txtSearch.Text + "%'").CopyToDataTable();
dlshow.DataSource = dt2; // i want to bind only matching values to datalist
dlshow.DataBind();
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